diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40d2b56..d804062 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.2.0
+
+- **Breaking change**: Exposed contracts and functions now use a `$` prefix by default.
+
+The previous prefix `x` can be restored by configuring the plugin as explained in the README.
+
 ## 0.1.11
 
 - Expose internal variables.
diff --git a/README.md b/README.md
index d31ed19..a3f794c 100644
--- a/README.md
+++ b/README.md
@@ -20,18 +20,18 @@ Note: After setting up for the first time, you may need to recompile with `hardh
 
 ## Usage
 
-The plugin will create "exposed" versions of your contracts that will be prefixed with an `X`, and its internal functions will be exposed as external functions with an `x` prefix.
+The plugin will create "exposed" versions of your contracts that will be prefixed with the symbol `$`, and its internal functions will be exposed as external functions with a `$` prefix as well.
 
 These exposed contracts will be created in a `contracts-exposed` directory. We strongly suggest adding this directory to `.gitignore`.
 
 If you have a contract called `Foo`, with an internal function called `_get`:
 
 ```javascript
-const Foo = ethers.getContractFactory('XFoo');
-// or const Foo = artifacts.require('XFoo');
+const Foo = ethers.getContractFactory('$Foo');
+// or const Foo = artifacts.require('$Foo');
 
 const foo = Foo.deploy();
-await foo.x_get();
+await foo.$_get();
 ```
 
 The plugin will also generate a constructor to initialize your abstract contracts.
@@ -53,7 +53,7 @@ contract C is A, B {
 In the plugin-generated exposed version of `C`, there will be an additional parameter to initialize `B`.
 
 ```solidity
-contract XC is C {
+contract $C is C {
     constructor(uint256 b, uint256 c) B(b) C(c) {}
 }
 ```
@@ -61,3 +61,11 @@ contract XC is C {
 The order of parameters in this generated constructor will be according to the linearization of the parent contracts, starting with the most base contract and ending with the most derived one. This order can be unintuitive, so in these cases make sure you test the contract was initialized as desired.
 
 Note that if a contract is abstract because it's missing an implementation for a virtual function, the exposed contract will remain abstract too.
+
+## Configuration
+
+The prefix can be configured in your Hardhat config. For example, to use the `X`/`x` prefix
+
+```
+exposed: { prefix: 'x' },
+```
diff --git a/package-lock.json b/package-lock.json
index ea9e7c3..8d3a164 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@types/mocha": "^7.0.2",
         "@types/node": "^10.17.60",
         "ava": "^4.0.1",
-        "ethers": "^5.3.0",
+        "ethers": "^5.5.4",
         "hardhat": "^2.3.0",
         "mocha": "^8.4.0",
         "rimraf": "^3.0.2",
@@ -180,9 +180,9 @@
       "dev": true
     },
     "node_modules/@ethersproject/abi": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.3.0.tgz",
-      "integrity": "sha512-NaT4UacjOwca8qCG/gv8k+DgTcWu49xlrvdhr/p8PTFnoS8e3aMWqjI3znFME5Txa/QWXDrg2/heufIUue9rtw==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.5.0.tgz",
+      "integrity": "sha512-loW7I4AohP5KycATvc0MgujU6JyCHPqHdeoo9z3Nr9xEiNioxa65ccdm1+fsoJhkuhdRtfcL8cfyGamz2AxZ5w==",
       "dev": true,
       "funding": [
         {
@@ -195,21 +195,21 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/address": "^5.3.0",
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/constants": "^5.3.0",
-        "@ethersproject/hash": "^5.3.0",
-        "@ethersproject/keccak256": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0"
+        "@ethersproject/address": "^5.5.0",
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/constants": "^5.5.0",
+        "@ethersproject/hash": "^5.5.0",
+        "@ethersproject/keccak256": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/abstract-provider": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.3.0.tgz",
-      "integrity": "sha512-1+MLhGP1GwxBDBNwMWVmhCsvKwh4gK7oIfOrmlmePNeskg1NhIrYssraJBieaFNHUYfKEd/1DjiVZMw8Qu5Cxw==",
+      "version": "5.5.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.5.1.tgz",
+      "integrity": "sha512-m+MA/ful6eKbxpr99xUYeRvLkfnlqzrF8SZ46d/xFB1A7ZVknYc/sXJG0RcufF52Qn2jeFj1hhcoQ7IXjNKUqg==",
       "dev": true,
       "funding": [
         {
@@ -222,19 +222,19 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/networks": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/transactions": "^5.3.0",
-        "@ethersproject/web": "^5.3.0"
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/networks": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/transactions": "^5.5.0",
+        "@ethersproject/web": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/abstract-signer": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.3.0.tgz",
-      "integrity": "sha512-w8IFwOYqiPrtvosPuArZ3+QPR2nmdVTRrVY8uJYL3NNfMmQfTy3V3l2wbzX47UUlNbPJY+gKvzJAyvK1onZxJg==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.5.0.tgz",
+      "integrity": "sha512-lj//7r250MXVLKI7sVarXAbZXbv9P50lgmJQGr2/is82EwEb8r7HrxsmMqAjTsztMYy7ohrIhGMIml+Gx4D3mA==",
       "dev": true,
       "funding": [
         {
@@ -247,17 +247,17 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/abstract-provider": "^5.3.0",
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0"
+        "@ethersproject/abstract-provider": "^5.5.0",
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/address": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.3.0.tgz",
-      "integrity": "sha512-29TgjzEBK+gUEUAOfWCG7s9IxLNLCqvr+oDSk6L9TXD0VLvZJKhJV479tKQqheVA81OeGxfpdxYtUVH8hqlCvA==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.5.0.tgz",
+      "integrity": "sha512-l4Nj0eWlTUh6ro5IbPTgbpT4wRbdH5l8CQf7icF7sb/SI3Nhd9Y9HzhonTSTi6CefI0necIw7LJqQPopPLZyWw==",
       "dev": true,
       "funding": [
         {
@@ -270,17 +270,17 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/keccak256": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/rlp": "^5.3.0"
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/keccak256": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/rlp": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/base64": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/base64/-/base64-5.3.0.tgz",
-      "integrity": "sha512-JIqgtOmgKcbc2sjGWTXyXktqUhvFUDte8fPVsAaOrcPiJf6YotNF+nsrOYGC9pbHBEGSuSBp3QR0varkO8JHEw==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/base64/-/base64-5.5.0.tgz",
+      "integrity": "sha512-tdayUKhU1ljrlHzEWbStXazDpsx4eg1dBXUSI6+mHlYklOXoXF6lZvw8tnD6oVaWfnMxAgRSKROg3cVKtCcppA==",
       "dev": true,
       "funding": [
         {
@@ -293,13 +293,13 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bytes": "^5.3.0"
+        "@ethersproject/bytes": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/basex": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/basex/-/basex-5.3.0.tgz",
-      "integrity": "sha512-8J4nS6t/SOnoCgr3DF5WCSRLC5YwTKYpZWJqeyYQLX+86TwPhtzvHXacODzcDII9tWKhVg6g0Bka8JCBWXsCiQ==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/basex/-/basex-5.5.0.tgz",
+      "integrity": "sha512-ZIodwhHpVJ0Y3hUCfUucmxKsWQA5TMnavp5j/UOuDdzZWzJlRmuOjcTMIGgHCYuZmHt36BfiSyQPSRskPxbfaQ==",
       "dev": true,
       "funding": [
         {
@@ -312,14 +312,14 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0"
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/bignumber": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/bignumber/-/bignumber-5.3.0.tgz",
-      "integrity": "sha512-5xguJ+Q1/zRMgHgDCaqAexx/8DwDVLRemw2i6uR8KyGjwGdXI8f32QZZ1cKGucBN6ekJvpUpHy6XAuQnTv0mPA==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/bignumber/-/bignumber-5.5.0.tgz",
+      "integrity": "sha512-6Xytlwvy6Rn3U3gKEc1vP7nR92frHkv6wtVr95LFR3jREXiCPzdWxKQ1cx4JGQBXxcguAwjA8murlYN2TSiEbg==",
       "dev": true,
       "funding": [
         {
@@ -332,8 +332,8 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
         "bn.js": "^4.11.9"
       }
     },
@@ -344,9 +344,9 @@
       "dev": true
     },
     "node_modules/@ethersproject/bytes": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/bytes/-/bytes-5.3.0.tgz",
-      "integrity": "sha512-rqLJjdVqCcn7glPer7Fxh87PRqlnRScVAoxcIP3PmOUNApMWJ6yRdOFfo2KvPAdO7Le3yEI1o0YW+Yvr7XCYvw==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/bytes/-/bytes-5.5.0.tgz",
+      "integrity": "sha512-ABvc7BHWhZU9PNM/tANm/Qx4ostPGadAuQzWTr3doklZOhDlmcBqclrQe/ZXUIj3K8wC28oYeuRa+A37tX9kog==",
       "dev": true,
       "funding": [
         {
@@ -359,13 +359,13 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/logger": "^5.3.0"
+        "@ethersproject/logger": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/constants": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/constants/-/constants-5.3.0.tgz",
-      "integrity": "sha512-4y1feNOwEpgjAfiCFWOHznvv6qUF/H6uI0UKp8xdhftb+H+FbKflXg1pOgH5qs4Sr7EYBL+zPyPb+YD5g1aEyw==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/constants/-/constants-5.5.0.tgz",
+      "integrity": "sha512-2MsRRVChkvMWR+GyMGY4N1sAX9Mt3J9KykCsgUFd/1mwS0UH1qw+Bv9k1UJb3X3YJYFco9H20pjSlOIfCG5HYQ==",
       "dev": true,
       "funding": [
         {
@@ -378,13 +378,13 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/bignumber": "^5.3.0"
+        "@ethersproject/bignumber": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/contracts": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/contracts/-/contracts-5.3.0.tgz",
-      "integrity": "sha512-eDyQ8ltykvyQqnGZxb/c1e0OnEtzqXhNNC4BX8nhYBCaoBrYYuK/1fLmyEvc5+XUMoxNhwpYkoSSwvPLci7/Zg==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/contracts/-/contracts-5.5.0.tgz",
+      "integrity": "sha512-2viY7NzyvJkh+Ug17v7g3/IJC8HqZBDcOjYARZLdzRxrfGlRgmYgl6xPRKVbEzy1dWKw/iv7chDcS83pg6cLxg==",
       "dev": true,
       "funding": [
         {
@@ -397,22 +397,22 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/abi": "^5.3.0",
-        "@ethersproject/abstract-provider": "^5.3.0",
-        "@ethersproject/abstract-signer": "^5.3.0",
-        "@ethersproject/address": "^5.3.0",
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/constants": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/transactions": "^5.3.0"
+        "@ethersproject/abi": "^5.5.0",
+        "@ethersproject/abstract-provider": "^5.5.0",
+        "@ethersproject/abstract-signer": "^5.5.0",
+        "@ethersproject/address": "^5.5.0",
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/constants": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/transactions": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/hash": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/hash/-/hash-5.3.0.tgz",
-      "integrity": "sha512-gAFZSjUPQ32CIfoKSMtMEQ+IO0kQxqhwz9fCIFt2DtAq2u4pWt8mL9Z5P0r6KkLcQU8LE9FmuPPyd+JvBzmr1w==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/hash/-/hash-5.5.0.tgz",
+      "integrity": "sha512-dnGVpK1WtBjmnp3mUT0PlU2MpapnwWI0PibldQEq1408tQBAbZpPidkWoVVuNMOl/lISO3+4hXZWCL3YV7qzfg==",
       "dev": true,
       "funding": [
         {
@@ -425,20 +425,20 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/abstract-signer": "^5.3.0",
-        "@ethersproject/address": "^5.3.0",
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/keccak256": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0"
+        "@ethersproject/abstract-signer": "^5.5.0",
+        "@ethersproject/address": "^5.5.0",
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/keccak256": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/hdnode": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/hdnode/-/hdnode-5.3.0.tgz",
-      "integrity": "sha512-zLmmtLNoDMGoYRdjOab01Zqkvp+TmZyCGDAMQF1Bs3yZyBs/kzTNi1qJjR1jVUcPP5CWGtjFwY8iNG8oNV9J8g==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/hdnode/-/hdnode-5.5.0.tgz",
+      "integrity": "sha512-mcSOo9zeUg1L0CoJH7zmxwUG5ggQHU1UrRf8jyTYy6HxdZV+r0PBoL1bxr+JHIPXRzS6u/UW4mEn43y0tmyF8Q==",
       "dev": true,
       "funding": [
         {
@@ -451,24 +451,24 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/abstract-signer": "^5.3.0",
-        "@ethersproject/basex": "^5.3.0",
-        "@ethersproject/bignumber": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/pbkdf2": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/sha2": "^5.3.0",
-        "@ethersproject/signing-key": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0",
-        "@ethersproject/transactions": "^5.3.0",
-        "@ethersproject/wordlists": "^5.3.0"
+        "@ethersproject/abstract-signer": "^5.5.0",
+        "@ethersproject/basex": "^5.5.0",
+        "@ethersproject/bignumber": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/pbkdf2": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/sha2": "^5.5.0",
+        "@ethersproject/signing-key": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0",
+        "@ethersproject/transactions": "^5.5.0",
+        "@ethersproject/wordlists": "^5.5.0"
       }
     },
     "node_modules/@ethersproject/json-wallets": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/json-wallets/-/json-wallets-5.3.0.tgz",
-      "integrity": "sha512-/xwbqaIb5grUIGNmeEaz8GdcpmDr++X8WT4Jqcclnxow8PXCUHFeDxjf3O+nSuoqOYG/Ds0+BI5xuQKbva6Xkw==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/json-wallets/-/json-wallets-5.5.0.tgz",
+      "integrity": "sha512-9lA21XQnCdcS72xlBn1jfQdj2A1VUxZzOzi9UkNdnokNKke/9Ya2xA9aIK1SC3PQyBDLt4C+dfps7ULpkvKikQ==",
       "dev": true,
       "funding": [
         {
@@ -481,25 +481,25 @@
         }
       ],
       "dependencies": {
-        "@ethersproject/abstract-signer": "^5.3.0",
-        "@ethersproject/address": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/hdnode": "^5.3.0",
-        "@ethersproject/keccak256": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/pbkdf2": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/random": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0",
-        "@ethersproject/transactions": "^5.3.0",
+        "@ethersproject/abstract-signer": "^5.5.0",
+        "@ethersproject/address": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/hdnode": "^5.5.0",
+        "@ethersproject/keccak256": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/pbkdf2": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/random": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0",
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+        "@ethersproject/signing-key": "^5.5.0",
+        "@ethersproject/transactions": "^5.5.0",
+        "@ethersproject/wordlists": "^5.5.0"
       }
     },
     "@ethersproject/web": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/web/-/web-5.3.0.tgz",
-      "integrity": "sha512-Ni6/DHnY6k/TD41LEkv0RQDx4jqWz5e/RZvrSecsxGYycF+MFy2z++T/yGc2peRunLOTIFwEksgEGGlbwfYmhQ==",
+      "version": "5.5.1",
+      "resolved": "https://registry.npmjs.org/@ethersproject/web/-/web-5.5.1.tgz",
+      "integrity": "sha512-olvLvc1CB12sREc1ROPSHTdFCdvMh0J5GSJYiQg2D0hdD4QmJDy8QYDb1CvoqD/bF1c++aeKv2sR5uduuG9dQg==",
       "dev": true,
       "requires": {
-        "@ethersproject/base64": "^5.3.0",
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0"
+        "@ethersproject/base64": "^5.5.0",
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0"
       }
     },
     "@ethersproject/wordlists": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@ethersproject/wordlists/-/wordlists-5.3.0.tgz",
-      "integrity": "sha512-JcwumCZcsUxgWpiFU/BRy6b4KlTRdOmYvOKZcAw/3sdF93/pZyPW5Od2hFkHS8oWp4xS06YQ+qHqQhdcxdHafQ==",
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/wordlists/-/wordlists-5.5.0.tgz",
+      "integrity": "sha512-bL0UTReWDiaQJJYOC9sh/XcRu/9i2jMrzf8VLRmPKx58ckSlOJiohODkECCO50dtLZHcGU6MLXQ4OOrgBwP77Q==",
       "dev": true,
       "requires": {
-        "@ethersproject/bytes": "^5.3.0",
-        "@ethersproject/hash": "^5.3.0",
-        "@ethersproject/logger": "^5.3.0",
-        "@ethersproject/properties": "^5.3.0",
-        "@ethersproject/strings": "^5.3.0"
+        "@ethersproject/bytes": "^5.5.0",
+        "@ethersproject/hash": "^5.5.0",
+        "@ethersproject/logger": "^5.5.0",
+        "@ethersproject/properties": "^5.5.0",
+        "@ethersproject/strings": "^5.5.0"
       }
     },
     "@nodelib/fs.scandir": {
@@ -14163,41 +14151,41 @@
       }
     },
     "ethers": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/ethers/-/ethers-5.3.0.tgz",
-      "integrity": "sha512-myN+338S4sFQZvQ9trii7xit8Hu/LnUtjA0ROFOHpUreQc3fgLZEMNVqF3vM1u2D78DIIeG1TbuozVCVlXQWvQ==",
-      "dev": true,
-      "requires": {
-        "@ethersproject/abi": "5.3.0",
-        "@ethersproject/abstract-provider": "5.3.0",
-        "@ethersproject/abstract-signer": "5.3.0",
-        "@ethersproject/address": "5.3.0",
-        "@ethersproject/base64": "5.3.0",
-        "@ethersproject/basex": "5.3.0",
-        "@ethersproject/bignumber": "5.3.0",
-        "@ethersproject/bytes": "5.3.0",
-        "@ethersproject/constants": "5.3.0",
-        "@ethersproject/contracts": "5.3.0",
-        "@ethersproject/hash": "5.3.0",
-        "@ethersproject/hdnode": "5.3.0",
-        "@ethersproject/json-wallets": "5.3.0",
-        "@ethersproject/keccak256": "5.3.0",
-        "@ethersproject/logger": "5.3.0",
-        "@ethersproject/networks": "5.3.0",
-        "@ethersproject/pbkdf2": "5.3.0",
-        "@ethersproject/properties": "5.3.0",
-        "@ethersproject/providers": "5.3.0",
-        "@ethersproject/random": "5.3.0",
-        "@ethersproject/rlp": "5.3.0",
-        "@ethersproject/sha2": "5.3.0",
-        "@ethersproject/signing-key": "5.3.0",
-        "@ethersproject/solidity": "5.3.0",
-        "@ethersproject/strings": "5.3.0",
-        "@ethersproject/transactions": "5.3.0",
-        "@ethersproject/units": "5.3.0",
-        "@ethersproject/wallet": "5.3.0",
-        "@ethersproject/web": "5.3.0",
-        "@ethersproject/wordlists": "5.3.0"
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/ethers/-/ethers-5.5.4.tgz",
+      "integrity": "sha512-N9IAXsF8iKhgHIC6pquzRgPBJEzc9auw3JoRkaKe+y4Wl/LFBtDDunNe7YmdomontECAcC5APaAgWZBiu1kirw==",
+      "dev": true,
+      "requires": {
+        "@ethersproject/abi": "5.5.0",
+        "@ethersproject/abstract-provider": "5.5.1",
+        "@ethersproject/abstract-signer": "5.5.0",
+        "@ethersproject/address": "5.5.0",
+        "@ethersproject/base64": "5.5.0",
+        "@ethersproject/basex": "5.5.0",
+        "@ethersproject/bignumber": "5.5.0",
+        "@ethersproject/bytes": "5.5.0",
+        "@ethersproject/constants": "5.5.0",
+        "@ethersproject/contracts": "5.5.0",
+        "@ethersproject/hash": "5.5.0",
+        "@ethersproject/hdnode": "5.5.0",
+        "@ethersproject/json-wallets": "5.5.0",
+        "@ethersproject/keccak256": "5.5.0",
+        "@ethersproject/logger": "5.5.0",
+        "@ethersproject/networks": "5.5.2",
+        "@ethersproject/pbkdf2": "5.5.0",
+        "@ethersproject/properties": "5.5.0",
+        "@ethersproject/providers": "5.5.3",
+        "@ethersproject/random": "5.5.1",
+        "@ethersproject/rlp": "5.5.0",
+        "@ethersproject/sha2": "5.5.0",
+        "@ethersproject/signing-key": "5.5.0",
+        "@ethersproject/solidity": "5.5.0",
+        "@ethersproject/strings": "5.5.0",
+        "@ethersproject/transactions": "5.5.0",
+        "@ethersproject/units": "5.5.0",
+        "@ethersproject/wallet": "5.5.0",
+        "@ethersproject/web": "5.5.1",
+        "@ethersproject/wordlists": "5.5.0"
       }
     },
     "ethjs-unit": {
diff --git a/package.json b/package.json
index 4af5364..d2087c5 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@types/mocha": "^7.0.2",
     "@types/node": "^10.17.60",
     "ava": "^4.0.1",
-    "ethers": "^5.3.0",
+    "ethers": "^5.5.4",
     "hardhat": "^2.3.0",
     "mocha": "^8.4.0",
     "rimraf": "^3.0.2",
diff --git a/src/core.test.ts.md b/src/core.test.ts.md
index 50d9318..9144ab6 100644
--- a/src/core.test.ts.md
+++ b/src/core.test.ts.md
@@ -14,206 +14,206 @@ Generated by [AVA](https://avajs.dev).
     ␊
     import "../contracts/Test.sol";␊
     ␊
-    contract XFoo is Foo {␊
+    contract $Foo is Foo {␊
         constructor() {}␊
     ␊
-        function xs() external view returns (Foo.S memory) {␊
+        function $s() external view returns (Foo.S memory) {␊
             return s;␊
         }␊
     ␊
-        function x_testFoo() external pure returns (uint256) {␊
+        function $_testFoo() external pure returns (uint256) {␊
             return super._testFoo();␊
         }␊
     ␊
-        function x_testString() external pure returns (string memory) {␊
+        function $_testString() external pure returns (string memory) {␊
             return super._testString();␊
         }␊
     ␊
-        function x_testStruct() external pure returns (Foo.S memory) {␊
+        function $_testStruct() external pure returns (Foo.S memory) {␊
             return super._testStruct();␊
         }␊
     ␊
-        function x_testStructStorageOutput() external view returns (Foo.S memory) {␊
+        function $_testStructStorageOutput() external view returns (Foo.S memory) {␊
             return super._testStructStorageOutput();␊
         }␊
     }␊
     ␊
-    contract XBar is Bar {␊
+    contract $Bar is Bar {␊
         constructor() {}␊
     ␊
-        function xs() external view returns (Foo.S memory) {␊
+        function $s() external view returns (Foo.S memory) {␊
             return s;␊
         }␊
     ␊
-        function x_testBar() external pure returns (uint256) {␊
+        function $_testBar() external pure returns (uint256) {␊
             return super._testBar();␊
         }␊
     ␊
-        function x_testFoo() external pure returns (uint256) {␊
+        function $_testFoo() external pure returns (uint256) {␊
             return super._testFoo();␊
         }␊
     ␊
-        function x_testString() external pure returns (string memory) {␊
+        function $_testString() external pure returns (string memory) {␊
             return super._testString();␊
         }␊
     ␊
-        function x_testStruct() external pure returns (Foo.S memory) {␊
+        function $_testStruct() external pure returns (Foo.S memory) {␊
             return super._testStruct();␊
         }␊
     ␊
-        function x_testStructStorageOutput() external view returns (Foo.S memory) {␊
+        function $_testStructStorageOutput() external view returns (Foo.S memory) {␊
             return super._testStructStorageOutput();␊
         }␊
     }␊
     ␊
-    contract XLib {␊
+    contract $Lib {␊
         constructor() {}␊
     ␊
-        function x_testLib() external pure returns (uint256) {␊
+        function $_testLib() external pure returns (uint256) {␊
             return Lib._testLib();␊
         }␊
     ␊
-        function x_testExt() external pure returns (uint256) {␊
+        function $_testExt() external pure returns (uint256) {␊
             return Lib._testExt();␊
         }␊
     }␊
     ␊
-    abstract contract XIface is Iface {␊
+    abstract contract $Iface is Iface {␊
         constructor() {}␊
     }␊
     ␊
-    abstract contract XAbs is Abs {␊
+    abstract contract $Abs is Abs {␊
         constructor() {}␊
     }␊
     ␊
-    contract XConcrete1 is Concrete1 {␊
+    contract $Concrete1 is Concrete1 {␊
         constructor() {}␊
     }␊
     ␊
-    contract XConcrete2 is Concrete2 {␊
+    contract $Concrete2 is Concrete2 {␊
         constructor() {}␊
     }␊
     ␊
-    contract XParent1 is Parent1 {␊
+    contract $Parent1 is Parent1 {␊
         constructor(uint256 x) Parent1(x) {}␊
     ␊
-        function x_testParent1() external {␊
+        function $_testParent1() external {␊
             return super._testParent1();␊
         }␊
     }␊
     ␊
-    contract XParent2 is Parent2 {␊
+    contract $Parent2 is Parent2 {␊
         constructor(uint256 y) Parent2(y) {}␊
     }␊
     ␊
-    contract XParent3 is Parent3 {␊
+    contract $Parent3 is Parent3 {␊
         constructor(uint256 z) Parent3(z) {}␊
     }␊
     ␊
-    contract XChild1 is Child1 {␊
+    contract $Child1 is Child1 {␊
         constructor(uint256 x) Parent1(x) {}␊
     ␊
-        function x_testParent1() external {␊
+        function $_testParent1() external {␊
             return super._testParent1();␊
         }␊
     }␊
     ␊
-    contract XChild2 is Child2 {␊
+    contract $Child2 is Child2 {␊
         constructor(uint256 x, uint256 y) Parent1(x) Parent2(y) {}␊
     ␊
-        function x_testParent1() external {␊
+        function $_testParent1() external {␊
             return super._testParent1();␊
         }␊
     }␊
     ␊
-    contract XChild3 is Child3 {␊
+    contract $Child3 is Child3 {␊
         constructor(uint256 x, uint256 y) Parent1(x) Parent2(y) {}␊
     ␊
-        function x_testParent1() external {␊
+        function $_testParent1() external {␊
             return super._testParent1();␊
         }␊
     }␊
     ␊
-    contract XChild4 is Child4 {␊
+    contract $Child4 is Child4 {␊
         constructor(uint256 x, uint256 y, uint256 z, uint256 c) Parent1(x) Parent2(y) Parent3(z) Child4(c) {}␊
     ␊
-        function x_testParent1() external {␊
+        function $_testParent1() external {␊
             return super._testParent1();␊
         }␊
     }␊
     ␊
-    contract XTypes is Types {␊
+    contract $Types is Types {␊
         constructor() {}␊
     ␊
-        function x_testEnumType(Types.Enum e) external {␊
+        function $_testEnumType(Types.Enum e) external {␊
             return super._testEnumType(e);␊
         }␊
     ␊
-        function x_testContractType(Types t) external {␊
+        function $_testContractType(Types t) external {␊
             return super._testContractType(t);␊
         }␊
     }␊
     ␊
-    contract XConstructorStorageLocation is ConstructorStorageLocation {␊
+    contract $ConstructorStorageLocation is ConstructorStorageLocation {␊
         constructor(string memory name) ConstructorStorageLocation(name) {}␊
     }␊
     ␊
-    contract XChained0 is Chained0 {␊
+    contract $Chained0 is Chained0 {␊
         constructor() {}␊
     ␊
-        function x_chained() external {␊
+        function $_chained() external {␊
             return super._chained();␊
         }␊
     }␊
     ␊
-    contract XChained1 is Chained1 {␊
+    contract $Chained1 is Chained1 {␊
         constructor() {}␊
     ␊
-        function x_chained() external {␊
+        function $_chained() external {␊
             return super._chained();␊
         }␊
     }␊
     ␊
-    contract XChained2 is Chained2 {␊
+    contract $Chained2 is Chained2 {␊
         constructor() {}␊
     ␊
-        function x_chained() external {␊
+        function $_chained() external {␊
             return super._chained();␊
         }␊
     }␊
     ␊
-    contract XWithVars is WithVars {␊
+    contract $WithVars is WithVars {␊
         constructor() {}␊
     ␊
-        function xvar1() external view returns (uint256) {␊
+        function $var1() external view returns (uint256) {␊
             return var1;␊
         }␊
     ␊
-        function xvar2() external view returns (uint256[] memory) {␊
+        function $var2() external view returns (uint256[] memory) {␊
             return var2;␊
         }␊
     ␊
-        function xvar3(uint256 arg0) external view returns (uint8) {␊
+        function $var3(uint256 arg0) external view returns (uint8) {␊
             return var3[arg0];␊
         }␊
     ␊
-        function xvar4() external view returns (WithVars.Struct memory) {␊
+        function $var4() external view returns (WithVars.Struct memory) {␊
             return var4;␊
         }␊
     ␊
-        function xvar5() external view returns (WithVars.Struct[] memory) {␊
+        function $var5() external view returns (WithVars.Struct[] memory) {␊
             return var5;␊
         }␊
     ␊
-        function xvar6(uint256 arg0) external view returns (WithVars.Struct memory) {␊
+        function $var6(uint256 arg0) external view returns (WithVars.Struct memory) {␊
             return var6[arg0];␊
         }␊
     ␊
-        function xvar7(uint256 arg0, bool arg1) external view returns (WithVars.Struct memory) {␊
+        function $var7(uint256 arg0, bool arg1) external view returns (WithVars.Struct memory) {␊
             return var7[arg0][arg1];␊
         }␊
     ␊
-        function xvar8(uint256 arg0, bool arg1) external view returns (WithVars.Struct[] memory) {␊
+        function $var8(uint256 arg0, bool arg1) external view returns (WithVars.Struct[] memory) {␊
             return var8[arg0][arg1];␊
         }␊
     }␊
diff --git a/src/core.test.ts.snap b/src/core.test.ts.snap
index ad4c1e0..1681f9a 100644
Binary files a/src/core.test.ts.snap and b/src/core.test.ts.snap differ
diff --git a/src/core.ts b/src/core.ts
index f8ae92e..d1f5469 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -21,8 +21,9 @@ const sourcesPath = hre.config.paths.sources;
 const rootRelativeSourcesPath = path.relative(rootPath, sourcesPath);
 export const exposedPath = path.join(rootPath, 'contracts-exposed');
 const exposedVersionPragma = '>=0.6.0';
+const defaultPrefix = '$';
 
-export function getExposed(solcOutput: SolcOutput, isUserFile: (sourceName: string) => boolean): Map<string, ResolvedFile> {
+export function getExposed(solcOutput: SolcOutput, isUserFile: (sourceName: string) => boolean, prefix?: string): Map<string, ResolvedFile> {
   const res = new Map<string, ResolvedFile>();
   const contractMap = mapContracts(solcOutput);
 
@@ -31,18 +32,18 @@ export function getExposed(solcOutput: SolcOutput, isUserFile: (sourceName: stri
       continue;
     }
     const destPath = path.join(exposedPath, path.relative(rootRelativeSourcesPath, ast.absolutePath));
-    res.set(destPath, getExposedFile(destPath, ast, contractMap));
+    res.set(destPath, getExposedFile(destPath, ast, contractMap, prefix));
   }
 
   return res;
 }
 
-function getExposedFile(absolutePath: string, ast: SourceUnit, contractMap: ContractMap): ResolvedFile {
+function getExposedFile(absolutePath: string, ast: SourceUnit, contractMap: ContractMap, prefix?: string): ResolvedFile {
   const sourceName = path.relative(rootPath, absolutePath);
 
   const inputPath = path.relative(path.dirname(absolutePath), ast.absolutePath).replace(/\\/g, '/');
   const content: FileContent = {
-    rawContent: getExposedContent(ast, inputPath, contractMap),
+    rawContent: getExposedContent(ast, inputPath, contractMap, prefix),
     imports: [inputPath],
     versionPragmas: [exposedVersionPragma],
   };
@@ -59,7 +60,13 @@ function getExposedFile(absolutePath: string, ast: SourceUnit, contractMap: Cont
   };
 }
 
-function getExposedContent(ast: SourceUnit, inputPath: string, contractMap: ContractMap): string {
+function getExposedContent(ast: SourceUnit, inputPath: string, contractMap: ContractMap, prefix = defaultPrefix): string {
+  if (prefix === '' || /^\d|[^0-9a-z_$]/i.test(prefix)) {
+    throw new Error(`Prefix '${prefix}' is not valid`);
+  }
+
+  const contractPrefix = prefix.replace(/^./, c => c.toUpperCase());
+
   return formatLines(
     ...spaceBetween(
       ['// SPDX-License-Identifier: UNLICENSED'],
@@ -68,7 +75,7 @@ function getExposedContent(ast: SourceUnit, inputPath: string, contractMap: Cont
 
       ...Array.from(findAll('ContractDefinition', ast), c => {
         const isLibrary = c.contractKind === 'library';
-        const contractHeader = [`contract X${c.name}`];
+        const contractHeader = [`contract ${contractPrefix}${c.name}`];
         if (!areFunctionsFullyImplemented(c, contractMap)) {
           contractHeader.unshift('abstract');
         }
@@ -85,7 +92,7 @@ function getExposedContent(ast: SourceUnit, inputPath: string, contractMap: Cont
               return [
                 [
                   'function',
-                  `x${v.name}(${getVarGetterArgs(v).map(a => `${a.type} ${a.name}`).join(', ')})`,
+                  `${prefix}${v.name}(${getVarGetterArgs(v).map(a => `${a.type} ${a.name}`).join(', ')})`,
                   'external',
                   'view',
                   'returns',
@@ -102,7 +109,7 @@ function getExposedContent(ast: SourceUnit, inputPath: string, contractMap: Cont
               const args = getFunctionArguments(fn);
               const header = [
                 'function',
-                `x${fn.name}(${args.map(a => `${a.type} ${a.name}`)})`,
+                `${prefix}${fn.name}(${args.map(a => `${a.type} ${a.name}`)})`,
                 'external',
               ];
               if (fn.stateMutability !== 'nonpayable') {
diff --git a/src/plugin.test.ts b/src/plugin.test.ts
index 495247b..b3375a6 100644
--- a/src/plugin.test.ts
+++ b/src/plugin.test.ts
@@ -6,30 +6,30 @@ import { BigNumber } from 'ethers';
 import hre from 'hardhat';
 
 test('ethers', async t => {
-  const Foo = await hre.ethers.getContractFactory('XFoo');
+  const Foo = await hre.ethers.getContractFactory('$Foo');
   const foo = await Foo.deploy();
-  t.is((await foo.x_testFoo()).toHexString(), '0x0f00');
+  t.is((await foo.$_testFoo()).toHexString(), '0x0f00');
 
-  const XWithVars = await hre.ethers.getContractFactory('XWithVars');
-  const withVars = await XWithVars.deploy();
-  t.is((await withVars.xvar1()).toNumber(), 55);
-  t.deepEqual(await withVars.xvar2(), [BigNumber.from(1), BigNumber.from(2), BigNumber.from(3)]);
-  t.is((await withVars.xvar3(1)), 2);
-  t.like(await withVars.xvar4(), { a: BigNumber.from(1) });
-  t.like(await withVars.xvar5(), {
+  const WithVars = await hre.ethers.getContractFactory('$WithVars');
+  const withVars = await WithVars.deploy();
+  t.is((await withVars.$var1()).toNumber(), 55);
+  t.deepEqual(await withVars.$var2(), [BigNumber.from(1), BigNumber.from(2), BigNumber.from(3)]);
+  t.is((await withVars.$var3(1)), 2);
+  t.like(await withVars.$var4(), { a: BigNumber.from(1) });
+  t.like(await withVars.$var5(), {
     0: { a: BigNumber.from(1) },
     1: { a: BigNumber.from(2) },
     2: { a: BigNumber.from(3) },
   });
-  t.like(await withVars.xvar6(1), { a: BigNumber.from(2) });
-  t.like(await withVars.xvar7(1, true), { a: BigNumber.from(10) });
-  t.like(await withVars.xvar8(1, true), {
+  t.like(await withVars.$var6(1), { a: BigNumber.from(2) });
+  t.like(await withVars.$var7(1, true), { a: BigNumber.from(10) });
+  t.like(await withVars.$var8(1, true), {
     0: { a: BigNumber.from(11) },
   });
 });
 
 test('truffle', async t => {
-  const XFoo = hre.artifacts.require('XFoo');
-  const foo = await XFoo.new();
-  t.is((await foo.x_testFoo()).toString('hex'), 'f00');
+  const Foo = hre.artifacts.require('$Foo');
+  const foo = await Foo.new();
+  t.is((await foo.$_testFoo()).toString('hex'), 'f00');
 });
diff --git a/src/plugin.ts b/src/plugin.ts
index 3b577fc..114f7f2 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -1,4 +1,4 @@
-import { task } from 'hardhat/config';
+import { extendConfig, task } from 'hardhat/config';
 import {
   TASK_COMPILE_SOLIDITY_COMPILE,
   TASK_COMPILE_SOLIDITY_COMPILE_JOB,
@@ -7,6 +7,10 @@ import {
 } from 'hardhat/builtin-tasks/task-names';
 import type { CompilationJob, CompilerInput, CompilerOutput, SolcBuild } from 'hardhat/types';
 
+extendConfig((config, userConfig) => {
+  config.exposed = userConfig.exposed ?? {};
+});
+
 task(TASK_COMPILE_SOLIDITY_GET_SOURCE_PATHS, async (_0, _1, superCall: () => Promise<string[]>) => {
   const path = await import('path');
   const { exposedPath } = await import('./core');
@@ -63,7 +67,7 @@ async function getExposedJob(compilationJob: CompilationJob, output: CompilerOut
 
   const inputFiles = Object.fromEntries(compilationJob.getResolvedFiles().map(rf => [rf.sourceName, rf.absolutePath]));
   const isUserFile = (sourceName: string) => Boolean(inputFiles[sourceName]?.startsWith(hre.config.paths.sources));
-  const exposed = getExposed(output, isUserFile);
+  const exposed = getExposed(output, isUserFile, hre.config.exposed.prefix);
 
   const cj: CompilationJob = {
     getResolvedFiles: () => [...exposed.values()],
diff --git a/src/type-extensions.ts b/src/type-extensions.ts
new file mode 100644
index 0000000..62eded3
--- /dev/null
+++ b/src/type-extensions.ts
@@ -0,0 +1,16 @@
+import "hardhat/types/config";
+import "hardhat/types/runtime";
+
+declare module "hardhat/types/config" {
+  export interface HardhatUserConfig {
+    exposed?: {
+      prefix?: string;
+    };
+  }
+
+  export interface HardhatConfig {
+    exposed: {
+      prefix?: string;
+    };
+  }
+}