Robinhood Gateway is a low-latency JSON-RPC proxy gateway built for Robinhood Chain, designed for high-frequency trading (HFT) and market-making scenarios where every millisecond counts. Through an optimized relay architecture, we deliver millisecond-level response times and enterprise-grade reliability for on-chain data queries, transaction submission, and real-time feed streaming.

Why Robinhood Gateway

• Ultra-low latency -- Approximately 500 ms lower end-to-end latency than public RPC nodes; < 5 ms client-perceived latency for transaction submission
• High reliability -- Built-in automatic retry and failover mechanisms to minimize the impact of network fluctuations on strategy execution
• Independent quotas -- Query and transaction quotas are completely independent, ensuring your transaction channel remains available even when query quota is exhausted
• Real-time feed -- Stream Robinhood Chain feed data via WebSocket in real time, no polling required
• Simple integration -- Fully compatible with standard Ethereum JSON-RPC protocol; existing code requires minimal changes to integrate

Core Features

JSON-RPC Proxy

Use POST /v1/rpc to synchronously forward all standard Ethereum JSON-RPC requests to Robinhood Chain. Supports both single and batch requests, with response format identical to a direct RPC connection.

# Query chain ID
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}'
# → {"jsonrpc":"2.0","id":1,"result":"0x1237"}

Suitable for balance queries, block information retrieval, contract calls, and any on-chain read operation, as well as synchronous transaction submission that waits for on-chain confirmation.

See JSON-RPC Proxy for details.

Async Transaction Submission

Use POST /v1/tx to submit transactions. The endpoint returns HTTP 202 immediately upon receipt, then forwards the transaction in the background with built-in retry logic. Designed for trading strategies that demand minimal submission latency.

# JSON-RPC format
curl -X POST https://robinhood-ohio.flashblock.trade/v1/tx \
  -H "Content-Type: application/json" \
  -H "X-User-ID: <your-api-key>" \
  -d '{"jsonrpc":"2.0","method":"eth_sendRawTransaction","params":["0xf86c..."],"id":1}'
# → 202 {"code":"accepted","message":"transaction queued for submission"}

# Also supports raw hex (no JSON-RPC wrapping needed)
curl -X POST https://robinhood-ohio.flashblock.trade/v1/tx \
  -H "Content-Type: text/plain" \
  -H "X-User-ID: <your-api-key>" \
  -d '0xf86c0a8502540be400...'
# → 202 {"code":"accepted","message":"transaction queued for submission"}

See Transaction Submission for details.

Real-time Feed

Use GET /v1/feed to establish a WebSocket connection and automatically receive the Robinhood Chain real-time feed data stream.

const ws = new WebSocket('wss://robinhood-ohio.flashblock.trade/v1/feed', {
  headers: { 'X-User-ID': '<your-api-key>' }
});

ws.onmessage = (event) => {
  console.log('Feed:', JSON.parse(event.data));
};

See Real-time Feed for details.

Performance

Metric	Description
End-to-end latency	Approximately 500 ms lower than public RPC nodes
Transaction submission	Client-perceived latency < 5 ms (async queue returns immediately)
Reliability	Built-in automatic retry mechanism to mitigate network packet loss

Quick Start

Step 1: Get your API Key

Register at the FlashBlock Console to obtain your dedicated API Key. All API requests require this key in the request header:

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

Step 2: Verify your connection

Send a simple chain ID query to verify your setup:

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}'

Successful response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1237"
}

0x1237 = 4663 (Mainnet), 0xb626 = 46630 (Testnet)

Step 3: Query on-chain data

# Query latest block number
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_blockNumber","params":[],"id":1}'

# Query account balance
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_getBalance","params":["0xYourAddress","latest"],"id":1}'

Step 4: Submit a transaction

curl -X POST https://robinhood-ohio.flashblock.trade/v1/tx \
  -H "Content-Type: application/json" \
  -H "X-User-ID: <your-api-key>" \
  -d '{"jsonrpc":"2.0","method":"eth_sendRawTransaction","params":["0xf86c..."],"id":1}'
# → 202 Accepted

Documentation

Page	Description
Endpoints and Authentication	API base URL, network info, authentication
JSON-RPC Proxy	Synchronous queries and transaction proxy, batch requests
Transaction Submission	Async transaction submission (HTTP 202)
Real-time Feed	WebSocket feed connection and usage
Error Codes	Complete error code reference and troubleshooting
Pricing and Plans	Tiers, quotas, and pricing