Integration guide

apifare for LangChain

Give LangChain one prepaid key for every API it needs. There is no separate provider account or provider API key for eligible capabilities, and it all runs under hard caps and a kill switch.

Get a key

1 · Get a key

Create an account at /start: email in, token out (shown once). Save the token somewhere safe.

2 · Add apifare to LangChain

LangChain connects to MCP servers with MCPAdapter (beta, LangChain 1.4 or later) over a FastMCP Client. Pass your token as auth without the word "Bearer": FastMCP adds it.

pip install "langchain[mcp]"

import asyncio, os
from fastmcp.client import Client
from langchain.agents import create_agent
from langchain.mcp import MCPAdapter

async def main():
    client = Client("https://apifare.com/mcp", auth=os.environ["APIPAY_TOKEN"])
    async with MCPAdapter(client) as adapter:
        tools = await adapter.list_tools()
        agent = create_agent("claude-sonnet-5", tools)
        result = await agent.ainvoke(
            {"messages": [{"role": "user", "content": "What's the weather in London?"}]}
        )
        print(result["messages"][-1].content)

asyncio.run(main())

Set APIPAY_TOKEN and your model provider's key, then run it. On an older LangChain, MultiServerMCPClient from langchain-mcp-adapters takes the same URL with "transport": "http" and a headers entry.

3 · Try it

Ask your LangChain agent to search the web for X, then to fetch a URL, then what's the weather in London. Every call is debited from your balance and lands on your signed, exportable audit chain.

4 · Stay in control

Set daily or monthly caps per agent, and keep the kill switch ready. Both are checked before a call is dispatched. When the balance runs out, your agent gets an HTTP 402 with a top-up link it can hand you; the error catalog lists every stop and what unblocks it.

What LangChain can call

Everything on the key: search, filings, registries, weather, and ready-to-run tools, plus any provider key you vault yourself. Exact per-call prices are on /capabilities.

Config checked against LangChain's MCP docs on 2026-09-13. Markdown version: /integrations/langchain.md.

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Model guides

Calling a model's API directly instead? Give it apifare tools with a plain tool loop: DeepSeek · Kimi · Qwen · OpenAI GPT · Gemini.