API Base URL

https://robinhood-ohio.flashblock.trade

All requests must use HTTPS. HTTP requests are automatically redirected to HTTPS.

Network Information

Mainnet

Property	Value
Chain ID	4663 (0x1237)

Authentication

All API endpoints require your API Key in the request header:

X-User-ID: <your-api-key>

Requests without an API Key will receive a 401 auth_required error.

Example

curl -X POST https://robinhood-ohio.flashblock.trade/v1/rpc \
  -H "Content-Type: application/json" \
  -H "X-User-ID: <your-api-key>" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

API Endpoints

Path	Method	Description
/v1/rpc	POST	JSON-RPC synchronous proxy -- supports all standard Ethereum RPC methods
/v1/tx	POST	Async transaction submission -- queued and returns 202, forwarded automatically
/v1/feed	WebSocket	Real-time feed -- streaming on-chain data

Request Tracing

Every request is assigned a unique Request ID, included in both the response header and body:

• Response header: X-Request-ID
• Response body: request_id field

You can also provide a custom X-Request-ID in the request header, and the Gateway will echo it back:

curl -X POST https://robinhood-ohio.flashblock.trade/v1/rpc \
  -H "Content-Type: application/json" \
  -H "X-User-ID: <your-api-key>" \
  -H "X-Request-ID: my-trace-12345" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

When reporting issues, please include the Request ID to help us locate the problem quickly.