langchain-x402-discovery 1.0.0

LangChain tool for x402 Service Discovery — find paid API services at runtime

langchain-x402-discovery

A LangChain BaseTool that lets any LangChain agent discover x402-payable API services at runtime via the x402 Service Discovery API. Instead of hardcoding service URLs, your agent queries the discovery catalog and finds the best available endpoint ranked by quality tier and price.

Install

pip install langchain-x402-discovery
# or without PyPI:
pip install requests langchain-core
# and copy x402discovery_langchain/__init__.py into your project

Usage

from x402discovery_langchain import X402DiscoveryTool
from langchain.agents import initialize_agent, AgentType
from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="gpt-4o-mini")
agent = initialize_agent(
    tools=[X402DiscoveryTool()],
    llm=llm,
    agent=AgentType.OPENAI_FUNCTIONS,
    verbose=True,
)
result = agent.run("Find a web research API under $0.10 per call")
print(result)

The agent will call x402_discover(capability="research", max_price_usd=0.10) and return quality-ranked results with endpoint URLs and pricing.