@txn-dev/langchain

@txn-dev/langchain

LangChain tools for txn.dev - give your LangChain agents the ability to pay each other.

Install

npm install @txn-dev/langchain @txn-dev/sdk @langchain/core

Quick Start

import { TxnToolkit } from "@txn-dev/langchain";

// One line to get all payment tools
const tools = new TxnToolkit("txn_live_...").getTools();

// Pass to your LangChain agent
const agent = createReactAgent({ llm, tools });

Individual Tools

You can also use tools individually:

import { Txn } from "@txn-dev/sdk";
import { TxnPayTool, TxnGetBalanceTool } from "@txn-dev/langchain";

const txn = new Txn("txn_live_...");

const payTool = new TxnPayTool(txn);
const balanceTool = new TxnGetBalanceTool(txn);

Available Tools

Tool Class	Name	Description
TxnCreateWalletTool	txn_create_wallet	Create a new agent wallet
TxnListWalletsTool	txn_list_wallets	List all wallets
TxnPayTool	txn_pay	Transfer funds between wallets
TxnGetBalanceTool	txn_get_balance	Check a wallet's balance
TxnFundWalletTool	txn_fund_wallet	Generate a funding checkout link

With LangGraph

import { TxnToolkit } from "@txn-dev/langchain";
import { createReactAgent } from "@langchain/langgraph/prebuilt";
import { ChatAnthropic } from "@langchain/anthropic";

const llm = new ChatAnthropic({ model: "claude-sonnet-4-20250514" });
const tools = new TxnToolkit("txn_live_...").getTools();

const agent = createReactAgent({ llm, tools });

const result = await agent.invoke({
  messages: [
    {
      role: "user",
      content: "Create a wallet for my research agent, then check its balance",
    },
  ],
});

License

MIT