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GoldRush x402: Pay-Per-Request Blockchain Data via Micropayments We’ve launched GoldRush x402 — a payment-gated proxy that lets you access the full GoldRush blockchain data API by paying per request with stablecoins on Base, using the x402 protocol. No API key, no account, no credit card. Live now on Base Sepolia testnet.

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What’s new

GoldRush x402 is a reverse proxy in front of api.covalenthq.com that replaces API key authentication with micropayments. When you call an endpoint without payment, the server responds with 402 Payment Required and payment instructions. Your x402 client pays, retries, and gets the data, all in a single request-response cycle.

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Why it matters

  • Zero-friction access: No signup, no billing page, no minimums. Pay only for what you use.
  • Agent-native: AI agents can discover endpoints, evaluate pricing, and pay from their own wallets at runtime with no human in the loop.
  • Pre-payment validation: Requests are validated before you are charged. Malformed addresses or unsupported chains return errors at zero cost.
  • Smart caching: Cached responses (30s for balances, 5m for pricing) cost less. Coverage
  • 60+ endpoints — balances, NFTs, transactions, blocks, DEX data, pricing, security, and cross-chain operations
  • 100+ chains — Ethereum, Base, Arbitrum, Optimism, Polygon, Solana, Bitcoin, and more

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Pricing model

  • Fixed-price endpoints (balances, NFT holdings, block details): one price per call.
  • Tiered endpoints (transactions, event logs): choose a tier (Small/Medium/Large/XL) based on expected response size. Overshoot and you overpay slightly; undershoot and you get a 402 telling you the correct tier.

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Endpoint discovery (free)

# List all endpoints with pricing
curl https://x402.goldrush.dev/v1/x402/endpoints | jq

# Search for specific functionality
curl https://x402.goldrush.dev/v1/x402/search?q=balance | jq

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Quick start

import { HTTPClient } from "@x402/core";
import { ExactEvmScheme } from "@x402/evm";

const client = new HTTPClient({
  scheme: new ExactEvmScheme({
    network: "eip155:84532",
    privateKey: process.env.AGENT_WALLET_KEY,
  }),
});

const BASE = "https://x402.goldrush.dev/v1";
const balances = await client.get(
  `${BASE}/eth-mainnet/address/${walletAddress}/balances_v2/`
);

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What’s next

  • Base mainnet launch
  • Credit system for overpayments
  • WebSocket streaming with per-message micropayments
  • Open-sourcing the proxy

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Get started

GoldRush x402 is live on Base Sepolia testnet. Testnet stablecoins are free so you can build and test today at zero cost. Track transaction volume on x402scan. Learn more