snap-mcp-server

snap-mcp-server

MCP server for SNAP — private agent-to-agent payments on Solana using zero-knowledge proofs.

Exposes SNAP operations as Model Context Protocol tools so any MCP-compatible AI agent (Claude, Cursor, Windsurf, etc.) can make private payments on Solana mainnet.

Run

npx snap-mcp-server

Or add it to an MCP client config:

{
  "mcpServers": {
    "snap": {
      "command": "npx",
      "args": ["-y", "snap-mcp-server"],
      "env": {
        "SNAP_RPC_URL": "https://your-rpc-url.com",
        "SNAP_POOL_ADDRESS": "B8SyffZKt8LABKogWjH9rZcjY5PV2hyYRCbTxxbcrpFf"
      }
    }
  }
}

Tools

Tool	Description
snap_list_pools	List SNAP mainnet shielded pools
snap_deposit	Deposit SOL/USDC into a shielded pool, returns a note
snap_withdraw	Withdraw with a note, optionally via relayer
snap_withdraw_private	Relayed (gas-abstracted) withdrawal
snap_estimate_fee	Estimate the 0.25% protocol fee
snap_pool_info	Public info for the configured pool
snap_balance	Private shielded balance (requires a viewing key)

Environment

Variable	Required	Description
SNAP_RPC_URL	yes	Solana RPC endpoint
SNAP_POOL_ADDRESS	yes	Default shielded pool address
SNAP_RELAYER_URL	no	Relayer URL for gas-abstracted private withdrawals
SNAP_MCP_NOTE	no	Serialized note used when a withdraw call omits one
SNAP_MCP_VIEWING_KEY_JSON	no	Viewing key JSON for snap_balance
SNAP_MCP_STUB_MODE	no	Set to 1 for deterministic offline transport testing

Mainnet Pools

Pool	Address
0.1 SOL	B8SyffZKt8LABKogWjH9rZcjY5PV2hyYRCbTxxbcrpFf
1 USDC	5LeuHrPBgHNhgbCy996MEjcsBk5gNHhVj6AiuuCHZ8od
10 USDC	ECuHf8kgiWfmL3Q6id4WGBQWvuukhzqvF5vsxuPAKZBv

Links

• SNAP Protocol
• Website
• SDK
• LangChain tools

License

MIT