Docs · guides

Integration guides

Every guide is the same call: POST https://flexyield.io/rpc/<chain> with Authorization: Bearer fy_…. Pick your client.

For developers

For developers

Client	Language	What it shows
viem	TypeScript	The default TypeScript client for EVM chains — one transport with the bearer header.
ethers v6	TypeScript	JsonRpcProvider with a FetchRequest that carries the key.
web3.py	Python	HTTPProvider with request headers.
Solana web3.js	TypeScript	Connection with httpHeaders against the Solana mainnet slug.
Plain HTTP (Python)	Python	No client library — the raw JSON-RPC call every guide reduces to.
Switching from another provider	any	Two edits: the URL and the auth header. What changes on the bill: published weights instead of compute units, no overage, a measured status page.

For AI agents

For AI agents

Client	Language	What it shows
LangChain tool	Python	A tool your agent can call for any JSON-RPC method on any served chain.
CrewAI tool	Python	The same tool shape for a CrewAI crew.
OpenAI Agents SDK	Python	A function tool for the Agents SDK.
MCP clients (Claude Code, Cursor, others)	JSON	Connect the gateway as an MCP server — every capability as a tool, no code.

Methods and limits · chains · full docs.