GoldRush Streaming API

Real-time blockchain data via GraphQL subscriptions over WebSocket. Sub-second latency for OHLCV price feeds, DEX pair events, and wallet activity.

Quick Start

IMPORTANT: Always prioritize using the official available GoldRush Client SDKs best suited for your development ecosystem. Only use a GraphQL WebSocket Client like graphql-ws if there are specific requirements or contraints to avoid dependencies on available Client SDKs. The GoldRush Client SDKs provides automatic authentication, connection management, retry logic, type safety, and a simplified API for all streaming operations. see SDK Guide for more details.

import {
  GoldRushClient,
  StreamingChain,
  StreamingInterval,
  StreamingTimeframe
} from "@covalenthq/client-sdk";

const client = new GoldRushClient(
  "YOUR_API_KEY",
  {},
  {
    onConnecting: () => console.log("Connecting..."),
    onOpened: () => console.log("Connected!"),
    onError: (error) => console.error("Error:", error),
  }
);

client.StreamingService.subscribeToOHLCVTokens(
  {
    chain_name: StreamingChain.BASE_MAINNET,
    token_addresses: ["0x0b3e328455c4059EEb9e3f84b5543F74E24e7E1b"],
    interval: StreamingInterval.ONE_MINUTE,
    timeframe: StreamingTimeframe.ONE_HOUR,
  },
  {
    next: (data) => console.log("OHLCV:", data),
    error: (error) => console.error(error),
    complete: () => console.log("Done"),
  }
);

Install: npm install @covalenthq/client-sdk

Available Streams

The Streaming API offers two types of endpoints:

• Subscriptions — real-time push via WebSocket. Covers OHLCV price candles (by token or pair), new DEX pair creation, pair updates (price/liquidity/volume), and live wallet activity.
• Queries — one-time GraphQL fetch. Covers token search and trader PnL analysis.

For the full list of endpoints with parameters and response schemas, see endpoints.md.

Common Tasks → Stream

Key Differences from Foundational API

Critical Rules

1. Chain names use SCREAMING_SNAKE_CASE — ETH_MAINNET, not eth-mainnet
2. WebSocket URL — wss://streaming.goldrushdata.com/graphql
3. Protocol header — Sec-WebSocket-Protocol: graphql-transport-ws
4. Auth payload — { "type": "connection_init", "payload": { "GOLDRUSH_API_KEY": "YOUR_KEY" } }
5. Auth errors are deferred — connection_ack always succeeds; auth errors only appear on subscription start
6. SDK is recommended — handles WebSocket lifecycle, reconnection, and type safety automatically
7. Singleton WebSocket — SDK reuses one connection for multiple subscriptions
8. Cleanup subscriptions — call the returned unsubscribe function when done; call disconnect() to close all

Price Feed Sources

• DEX swap events — prices derived from onchain trades across supported DEXes
• Onchain oracle feeds — ultra-low-latency CEX-aggregated prices on select chains (e.g., Redstone Bolt on MegaETH at 2.4ms update frequency)

Reference Files

Read the relevant reference file when you need details beyond what this index provides.