MCP Toolkit
Build MCP servers that give AI agents self-custodial WDK wallets
The MCP Toolkit lets AI agents interact with self-custodial WDK wallets. It creates an MCP server that exposes wallet operations (checking balances, sending transactions, swapping tokens, bridging assets, and more) as structured tools that any MCP-compatible AI client can call.
Powered by @tetherto/wdk-mcp-toolkit.
Beta - This package is in active development (v1.0.0-beta.1). APIs may change between releases.
Features
- MCP Server Extension - Extends the official
@modelcontextprotocol/sdkMcpServer with WDK-specific capabilities - Multi-Chain - Support for 13 blockchains out of the box, including EVM chains, Bitcoin, Solana, Spark, TON, and Tron
- 35 Built-in Tools - Ready-to-use tools for wallets, pricing, indexer queries, swaps, bridges, lending, and fiat on/off-ramps
- Human Confirmation - All write operations use MCP elicitations to require explicit user approval before broadcasting transactions
- Extensible - Register custom tools alongside built-in ones using standard MCP SDK patterns
- Secure by Design - Seed phrases stay local,
close()wipes keys from memory, and read/write tool separation lets you control access
Supported Chains
| Chain | Identifier |
|---|---|
| Ethereum | ethereum |
| Polygon | polygon |
| Arbitrum | arbitrum |
| Optimism | optimism |
| Base | base |
| Avalanche | avalanche |
| BNB Chain | bnb |
| Plasma | plasma |
| Bitcoin | bitcoin |
| Solana | solana |
| Spark | spark |
| TON | ton |
| Tron | tron |
You can register any blockchain name - the CHAINS constants are for convenience only. For custom chains, register tokens manually with registerToken().
Get Started
Install and run your first MCP server in minutes
Configuration
Wallets, capabilities, tokens, protocols, and custom tools
API Reference
All 35 built-in MCP tools and the WdkMcpServer class
LangChain Integration
Use WDK tools in LangChain agents via the serve CLI