---
title: "Mixnet Module Examples"
description: "Runnable Rust examples for the Nym mixnet module: sending messages, SURB anonymous replies, MixnetClientBuilder, persistent storage, and parallel send/receive."
schemaType: "TechArticle"
section: "Developers"
lastUpdated: "2026-03-15"
---

# Examples

Runnable examples in [`sdk/rust/nym-sdk/examples/`](https://github.com/nymtech/nym/tree/develop/sdk/rust/nym-sdk/examples). Each file is self-contained with step-by-step comments.

```bash
cargo run --example <NAME>
```

| Example | Source | What it demonstrates |
|---|---|---|
| Simple | [`simple.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/simple.rs) | Send a message to yourself and print it |
| SURB Reply | [`surb_reply.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/surb_reply.rs) | Anonymous replies using `AnonymousSenderTag` and `send_reply()` |
| Builder | [`builder.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/builder.rs) | Using `MixnetClientBuilder` with ephemeral keys |
| Builder with Storage | [`builder_with_storage.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/builder_with_storage.rs) | Persisting keys to disk with `StoragePaths` |
| Parallel Send/Receive | [`parallel_sending_and_receiving.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/parallel_sending_and_receiving.rs) | Using `split_sender()` for concurrent tasks |
| Sandbox Testnet | [`sandbox.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/sandbox.rs) | Connecting to the Sandbox testnet instead of mainnet |
| Bandwidth Credential | [`bandwidth.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/bandwidth.rs) | Acquiring a bandwidth credential for paid mixnet access |
| Custom Topology | [`custom_topology_provider.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/custom_topology_provider.rs) | Implementing the `TopologyProvider` trait to filter or customize node selection |
| Overwrite Topology | [`manually_overwrite_topology.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/manually_overwrite_topology.rs) | Manually constructing a topology with hardcoded nodes |
| Control Requests | [`control_requests.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/control_requests.rs) | Sending service provider control requests (health, version, binary info) |
| Custom Storage | [`manually_handle_storage.rs`](https://github.com/nymtech/nym/blob/develop/sdk/rust/nym-sdk/examples/manually_handle_storage.rs) | Implementing custom storage backends for keys, gateways, and credentials |
