snap-langchain-tools

LangChain tools for SNAP — private agent-to-agent payments on Solana using zero-knowledge proofs.

Install

npm install snap-langchain-tools @langchain/core @solana/web3.js snap-solana-sdk

Quick Start

import { Connection, Keypair } from "@solana/web3.js";
import { createSNAPTools } from "snap-langchain-tools";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const wallet = Keypair.generate();

const tools = createSNAPTools(connection, wallet);
// Returns: [SNAPListPoolsTool, SNAPDepositTool, SNAPWithdrawTool, SNAPEstimateFeeTool]

Tools

| Tool | Description | |------|-------------| | snap_list_pools | List SNAP mainnet shielded pools | | snap_deposit | Deposit SOL/USDC into a shielded pool | | snap_withdraw | Withdraw with a Groth16 ZK proof | | snap_estimate_fee | Estimate the 0.25% protocol fee |

Usage with LangGraph Agent

import { ChatAnthropic } from "@langchain/anthropic";
import { createReactAgent } from "@langchain/langgraph/prebuilt";
import { createSNAPTools } from "snap-langchain-tools";

const tools = createSNAPTools(connection, wallet);
const agent = createReactAgent({
  llm: new ChatAnthropic({ model: "claude-sonnet-4-20250514" }),
  tools,
});

const result = await agent.invoke({
  messages: [{ role: "user", content: "List the available SNAP pools" }],
});

Mainnet Pools

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

Links

• SNAP Protocol
• Website
• SDK

License

MIT