diff --git a/crates/walrus-sdk/src/lib.rs b/crates/walrus-sdk/src/lib.rs
index 1e175ee71..a9de83055 100644
--- a/crates/walrus-sdk/src/lib.rs
+++ b/crates/walrus-sdk/src/lib.rs
@@ -11,6 +11,7 @@ pub mod error;
 pub mod store_when;
 /// Utilities for the Walrus SDK.
 pub mod utils;
+pub mod walrus;
 
 pub use sui_types::event::EventID;
 pub use walrus_sui as sui;
diff --git a/crates/walrus-sdk/src/walrus.rs b/crates/walrus-sdk/src/walrus.rs
new file mode 100644
index 000000000..736f18ee1
--- /dev/null
+++ b/crates/walrus-sdk/src/walrus.rs
@@ -0,0 +1,292 @@
+// Copyright (c) Walrus Foundation
+// SPDX-License-Identifier: Apache-2.0
+
+//! The primary entrypoint for Walrus SDK users.
+
+use std::{
+    path::PathBuf,
+    sync::{Arc, LazyLock},
+};
+
+use anyhow::{Context, Result};
+use chrono::{DateTime, Utc};
+pub use epochs::EpochArg;
+use sui_sdk::wallet_context::WalletContext;
+use sui_types::base_types::ObjectID;
+use tokio::sync::Mutex;
+use walrus_core::{
+    BlobId,
+    EncodingType,
+    EpochCount,
+    encoding::{EncodingConfig, EncodingConfigTrait as _, Primary},
+};
+use walrus_storage_node_client::api::BlobStatus;
+use walrus_sui::{
+    client::{BlobPersistence, PostStoreAction, SuiReadClient, retry_client::RetriableSuiClient},
+    config::WalletConfig,
+    types::move_structs::StakedWal,
+};
+use walrus_utils::backoff::ExponentialBackoffConfig;
+
+use crate::{
+    client::{Blocklist, Client, ClientConfig, refresh::CommitteesRefresherHandle},
+    config::load_configuration,
+    store_when::StoreWhen,
+};
+pub mod epochs;
+
+/// The handle to the global refresher. This is a singleton.
+static REFRESH_HANDLE: LazyLock<Mutex<Option<CommitteesRefresherHandle>>> =
+    LazyLock::new(|| Mutex::new(None));
+
+/// The output of the `store_blobs_dry_run` method.
+#[derive(Debug, Clone)]
+pub struct DryRunDetails {
+    /// The blob ID.
+    pub blob_id: BlobId,
+    /// The size of the unencoded blob (in bytes).
+    pub unencoded_size: u64,
+    /// The size of the encoded blob (in bytes).
+    pub encoded_size: u64,
+    /// The storage cost (in MIST).
+    pub storage_cost: u64,
+    /// The encoding type used for the blob.
+    pub encoding_type: EncodingType,
+}
+
+/// An enum representing either a file or a blob ID.
+#[derive(Debug, Clone)]
+pub enum FileOrBlobId {
+    /// A file containing a blob.
+    File(PathBuf),
+    /// A blob ID.
+    BlobId(BlobId),
+}
+
+impl FileOrBlobId {
+    /// Returns the blob ID if it is already present, or computes it from the file.
+    pub fn get_or_compute_blob_id(
+        self,
+        encoding_config: &EncodingConfig,
+        encoding_type: EncodingType,
+    ) -> Result<BlobId> {
+        match self {
+            Self::BlobId(blob_id) => Ok(blob_id),
+            Self::File(filename) => {
+                tracing::debug!(
+                    file = %filename.display(),
+                    "checking status of blob read from the filesystem"
+                );
+                let data = std::fs::read(&filename)
+                    .context(format!("unable to read blob from '{}'", filename.display()))?;
+                Ok(*encoding_config
+                    .get_for_type(encoding_type)
+                    .compute_metadata(&data)?
+                    .blob_id())
+            }
+        }
+    }
+}
+
+/// The output of the [`Walrus::fetch_blob_status_info`] method.
+#[derive(Debug, Clone)]
+pub struct BlobStatusInfo {
+    /// The blob ID.
+    pub blob_id: BlobId,
+    /// The file from which the blob might have been read.
+    pub file: Option<PathBuf>,
+    /// The blob's status.
+    pub status: BlobStatus,
+    /// The estimated expiry timestamp of the blob, present only for permanent blob.
+    pub estimated_expiry_timestamp: Option<DateTime<Utc>>,
+}
+
+/// The output of the [`Walrus::list_blobs`] method.
+#[derive(Debug)]
+pub struct BlobInfo {
+    /// The blob ID.
+    pub blob_id: BlobId,
+    /// The blob's size (in bytes).
+    pub unencoded_size: u64,
+    /// Whether the blob has been certified.
+    pub certified: bool,
+    /// Whether the blob is deletable.
+    pub deletable: bool,
+    /// The blob's expiry epoch.
+    pub expiry_epoch: u64,
+    /// The blob's object ID.
+    pub object_id: Option<ObjectID>,
+}
+
+/// An enum representing a blob content address within the system.
+#[derive(Debug)]
+pub enum BlobSpecifier {
+    /// The blob ID.
+    BlobId(BlobId),
+    /// The blob's object ID.
+    ObjectId(ObjectID),
+}
+
+/// The main entrypoint for the Walrus SDK.
+pub struct Walrus {
+    /// The Sui wallet for the client.
+    _wallet_context: Arc<WalletContext>,
+    /// The config for the client.
+    config: ClientConfig,
+    /// A blocklist of blobs to avoid.
+    blocklist: Option<Blocklist>,
+}
+
+impl std::fmt::Debug for Walrus {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Walrus")
+            .field("config", &self.config)
+            .finish()
+    }
+}
+
+impl Walrus {
+    /// Creates a high-level Walrus network client, loading the configuration and wallet context.
+    pub fn new(
+        config: &Option<PathBuf>,
+        context: Option<&str>,
+        wallet_override: &Option<PathBuf>,
+        blocklist: Option<Blocklist>,
+    ) -> Result<Self> {
+        let config = load_configuration(config.as_ref(), context)?;
+        let wallet_config = wallet_override
+            .as_ref()
+            .map(WalletConfig::from_path)
+            .or_else(|| config.wallet_config.clone());
+        let wallet_context = Arc::new(WalletConfig::load_wallet_context(
+            wallet_config.as_ref(),
+            config.communication_config.sui_client_request_timeout,
+        )?);
+
+        Ok(Self {
+            _wallet_context: wallet_context,
+            config,
+            blocklist,
+        })
+    }
+
+    // Implementations of client commands.
+
+    /// Read a blob from the Walrus network.
+    pub async fn read_blob(&self, blob_id: BlobId) -> Result<Vec<u8>> {
+        let client = {
+            let sui_read_client = {
+                let sui_client = RetriableSuiClient::new_for_rpc_urls(
+                    &self.config.rpc_urls,
+                    ExponentialBackoffConfig::default(),
+                    self.config.communication_config.sui_client_request_timeout,
+                )
+                .await
+                .context(format!(
+                    "cannot connect to Sui RPC nodes at {}",
+                    self.config.rpc_urls.join(", ")
+                ))?;
+
+                self.config.new_read_client(sui_client).await?
+            };
+
+            let mut client = Client::new_read_client(
+                self.config.clone(),
+                self.get_refresh_handle(sui_read_client.clone()).await?,
+                sui_read_client,
+            )
+            .await?;
+
+            if let Some(blocklist) = self.blocklist.as_ref() {
+                client = client.with_blocklist(blocklist.clone());
+            }
+
+            client
+        };
+
+        let start_timer = std::time::Instant::now();
+        let blob = client.read_blob::<Primary>(&blob_id).await?;
+        let blob_size = blob.len();
+        let elapsed = start_timer.elapsed();
+
+        tracing::debug!(%blob_id, ?elapsed, blob_size, "finished reading blob");
+        Ok(blob)
+    }
+
+    /// Write one or more blobs to the Walrus network.
+    ///
+    /// Returns the blob IDs of the blobs that were written, in the order of the input blobs.
+    #[allow(clippy::too_many_arguments)]
+    pub async fn store_blobs(
+        &self,
+        _blobs: Vec<Vec<u8>>,
+        _epoch_arg: EpochArg,
+        _store_when: StoreWhen,
+        _persistence: BlobPersistence,
+        _post_store: PostStoreAction,
+        _encoding_type: Option<EncodingType>,
+    ) -> Result<Vec<BlobId>> {
+        todo!()
+    }
+
+    /// Compute the details related to storing several blobs. This method does not actually store
+    /// the blobs, but returns the details of what would happen if they were stored.
+    pub async fn store_blobs_dry_run(
+        &self,
+        _files: Vec<PathBuf>,
+        _encoding_type: EncodingType,
+        _epochs_ahead: EpochCount,
+        _json: bool,
+    ) -> Result<Vec<DryRunDetails>> {
+        todo!()
+    }
+
+    /// Fetches the status of a blob given a [`FileOrBlobId`] and an optional encoding type.
+    pub async fn fetch_blob_status_info(
+        &self,
+        _file_or_blob_id: FileOrBlobId,
+        _encoding_type: Option<EncodingType>,
+    ) -> Result<BlobStatusInfo> {
+        todo!()
+    }
+
+    /// Lists all blobs owned by the wallet.
+    pub async fn list_blobs(&self, _include_expired: bool) -> Result<Vec<BlobInfo>> {
+        todo!()
+    }
+
+    /// Delete a blob from the Walrus network.
+    pub async fn delete_blob(&self, _blobs: BlobSpecifier) -> Result<()> {
+        todo!()
+    }
+
+    /// For each entry in `node_ids_with_amounts`, stakes the amount of WAL specified by the
+    /// corresponding second element of the pair with the node represented by the first element of
+    /// the pair.
+    pub async fn stake_with_node_pools(
+        &self,
+        _node_ids_with_amounts: Vec<(ObjectID, u64)>,
+    ) -> Result<Vec<StakedWal>> {
+        todo!()
+    }
+
+    // Get access to the global committees refresher handle. Create one if it doesn't exist.
+    async fn get_refresh_handle(
+        &self,
+        sui_read_client: SuiReadClient,
+    ) -> Result<CommitteesRefresherHandle> {
+        let mut global_refresher_handle = REFRESH_HANDLE.lock().await;
+        match global_refresher_handle.as_ref() {
+            Some(handle) => Ok(handle.clone()),
+            None => {
+                let new_handle = self
+                    .config
+                    .refresh_config
+                    .build_refresher_and_run(sui_read_client)
+                    .await?;
+                *global_refresher_handle = Some(new_handle.clone());
+                Ok(new_handle)
+            }
+        }
+    }
+}
diff --git a/crates/walrus-sdk/src/walrus/epochs.rs b/crates/walrus-sdk/src/walrus/epochs.rs
new file mode 100644
index 000000000..a34c608b9
--- /dev/null
+++ b/crates/walrus-sdk/src/walrus/epochs.rs
@@ -0,0 +1,73 @@
+// Copyright (c) Walrus Foundation
+// SPDX-License-Identifier: Apache-2.0
+
+//! Structures for use in the Walrus SDK related to epoch specification.
+use std::{num::NonZeroU32, time::SystemTime};
+
+use anyhow::{Result, anyhow};
+use walrus_core::{Epoch, EpochCount, ensure};
+
+/// The number of epochs to store the blob for.
+///
+/// Can be either a non-zero number of epochs or the special value `max`, which will store the blob
+/// for the maximum number of epochs allowed by the system object on chain.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum EpochCountOrMax {
+    /// Store the blob for the maximum number of epochs allowed.
+    Max,
+    /// The number of epochs to store the blob for.
+    Epochs(NonZeroU32),
+}
+
+impl TryFrom<&str> for EpochCountOrMax {
+    type Error = anyhow::Error;
+    fn try_from(input: &str) -> Result<Self> {
+        if input == "max" {
+            Ok(Self::Max)
+        } else {
+            let epochs = input.parse::<u32>()?;
+            Ok(Self::Epochs(NonZeroU32::new(epochs).ok_or_else(|| {
+                anyhow!("invalid epoch count; please a number >0 or `max`")
+            })?))
+        }
+    }
+}
+
+impl EpochCountOrMax {
+    /// Tries to convert the `EpochCountOrMax` into an `EpochCount` value.
+    ///
+    /// If the `EpochCountOrMax` is `Max`, the `max_epochs_ahead` is used as the maximum number of
+    /// epochs that can be stored ahead.
+    pub fn try_into_epoch_count(&self, max_epochs_ahead: EpochCount) -> anyhow::Result<EpochCount> {
+        match self {
+            EpochCountOrMax::Max => Ok(max_epochs_ahead),
+            EpochCountOrMax::Epochs(epochs) => {
+                let epochs = epochs.get();
+                ensure!(
+                    epochs <= max_epochs_ahead,
+                    "blobs can only be stored for up to {} epochs ahead; {} epochs were requested",
+                    max_epochs_ahead,
+                    epochs
+                );
+                Ok(epochs)
+            }
+        }
+    }
+}
+
+/// The number of epochs to store the blob for.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum EpochArg {
+    /// The number of epochs the blob is stored for.
+    ///
+    /// If set to `max`, the blob is stored for the maximum number of epochs allowed by the
+    /// system object on chain. Otherwise, the blob is stored for the specified number of
+    /// epochs. The number of epochs must be greater than 0.
+    EpochCountOrMax(EpochCountOrMax),
+
+    /// The earliest time when the blob can expire.
+    EarliestExpiryTime(SystemTime),
+
+    /// The end epoch for the blob.
+    EndEpoch(Epoch),
+}