Docs · guide · Python

LangChain tool with FlexYield

A tool your agent can call for any JSON-RPC method on any served chain.

Install

pip install langchain requests

Connect and call

import os, requests
from langchain_core.tools import tool

@tool
def rpc_call(chain: str, method: str, params: list) -> dict:
    """JSON-RPC call through FlexYield. chain: eth_mainnet, base_mainnet, arbitrum_one, optimism_mainnet, polygon_pos, solana_mainnet."""
    r = requests.post(f"https://flexyield.io/rpc/{chain}",
        headers={"Authorization": f"Bearer {os.environ['FLEXYIELD_KEY']}"},
        json={"jsonrpc": "2.0", "id": 1, "method": method, "params": params}, timeout=15)
    return r.json()

Replace fy_your_api_key with a key from your dashboard (free tier at registration). Chain slugs: eth_mainnet base_mainnet arbitrum_one optimism_mainnet polygon_pos solana_mainnet — each has its own measured page.

Notes

• Agents prefer the MCP server (/docs#agents): the same call is the rpc_call tool, plus toolbox tools and account tools.

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