langchain-nory

LangChain tools for x402 payments - Let your agents pay for APIs autonomously.

Overview

langchain-nory provides LangChain tools that enable AI agents to:

• Pay for x402-protected APIs automatically when they encounter HTTP 402 responses
• Access pre-built paid APIs for crypto prices, weather, translation, and more
• Make direct payments to any Solana or EVM wallet

All payments use USDC stablecoin on Solana (~400ms settlement) or EVM chains.

Installation

pip install langchain-nory

Quick Start

from langchain_nory import get_nory_tools
from langchain_openai import ChatOpenAI
from langchain.agents import create_react_agent, AgentExecutor

# Get all Nory tools (uses NORY_WALLET_KEY env var)
tools = get_nory_tools()

# Or configure with explicit wallet key
tools = get_nory_tools(wallet_key="your-solana-private-key")

# Create agent with tools
llm = ChatOpenAI(model="gpt-4")
agent = create_react_agent(llm, tools, prompt)
executor = AgentExecutor(agent=agent, tools=tools)

# Agent can now pay for APIs!
result = executor.invoke({"input": "What's the current price of Bitcoin?"})

Available Tools

Core Tools

Pre-built Paid API Tools

Individual Tool Usage

Fetch Any Paid API

from langchain_nory import NoryFetchTool

tool = NoryFetchTool(wallet_key="your-key")

# Automatically pays if the API requires it
result = tool.run("https://api.example.com/premium-data")

Get Crypto Prices

from langchain_nory import NoryCryptoPricesTool

tool = NoryCryptoPricesTool(wallet_key="your-key")
result = tool.run("BTC,ETH,SOL")
# {"BTC": {"price": 45000.50, ...}, "ETH": {...}, "SOL": {...}}

Get Weather

from langchain_nory import NoryWeatherTool

tool = NoryWeatherTool(wallet_key="your-key")
result = tool.run("London")
# {"current": {"temp": 15, "condition": "Cloudy"}, "forecast": [...]}

Translate Text

from langchain_nory import NoryTranslateTool

tool = NoryTranslateTool(wallet_key="your-key")
result = tool.run(text="Hello world", to_lang="es")
# {"translation": "Hola mundo", "from": "en", "to": "es"}

Environment Variables

export NORY_WALLET_KEY="your-solana-private-key"

With CrewAI

from crewai import Agent, Task, Crew
from langchain_nory import get_nory_tools

tools = get_nory_tools()

researcher = Agent(
    role="Market Researcher",
    goal="Get real-time crypto market data",
    tools=tools,
    verbose=True
)

task = Task(
    description="Get the current prices of BTC, ETH, and SOL",
    agent=researcher
)

crew = Crew(agents=[researcher], tasks=[task])
result = crew.kickoff()

How x402 Payment Works

1. Agent requests a paid API endpoint
2. Server returns 402 Payment Required with payment requirements
3. NoryFetchTool creates and signs a USDC transfer transaction
4. Transaction is sent to Nory for settlement (~400ms)
5. Agent retries request with X-PAYMENT header containing proof
6. Server verifies payment and returns data

All of this happens automatically - your agent just calls tool.run(url).

Links

• Website: noryx402.com
• Documentation: noryx402.com/docs
• x402 Protocol: github.com/coinbase/x402
• npm packages: nory-x402-payer | nory-x402-middleware

License

MIT