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GoldRush x402 lets you access the full GoldRush blockchain data API by paying per request using the x402 protocol. No account, no API key, no billing page - just pay for exactly what you use, directly from a wallet.
GoldRush x402 is live on Base Sepolia testnet. Mainnet support is coming soon.

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What is x402?

HTTP status code 402 Payment Required has existed since 1997, reserved for “future use.” The x402 protocol makes it real - enabling native payments over HTTP using stablecoins. When you call a GoldRush x402 endpoint without payment, the server responds with 402 Payment Required along with payment instructions. Your client pays using stablecoins on Base, retries the request with proof of payment, and gets the data - all in a single request-response cycle.

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How it works

GoldRush x402 is a transparent reverse proxy in front of api.covalenthq.com. It exposes the same paths and returns the same responses - the only difference is how you authenticate. Instead of an API key, you attach a micropayment. 
Your App -- x402 payment --> GoldRush x402 Proxy --> api.covalenthq.com
                                    |
                              validates request
                              verifies payment
                              caches response
                              returns data
The proxy validates your request before charging you. If the chain doesn’t exist, the address is malformed, or the endpoint doesn’t support that network - you get a clear error and pay nothing.

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What’s supported

  • 60+ endpoints covering balances, NFTs, transactions, blocks, DEX data, pricing, security, and cross-chain operations
  • 100+ blockchain networks including Ethereum, Base, Arbitrum, Optimism, Polygon, Solana, Bitcoin, and more
  • Response caching with intelligent TTLs (30s for balances, 5m for pricing data) - cached responses cost less
  • Per-wallet rate limiting at 100 requests per minute
  • Request validation before payment - you never pay for a request that would fail

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Pricing

Every endpoint has a credit rate. The price per call is: 
Price = creditRate x $0.000001

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Fixed pricing

Most endpoints have a fixed cost per request. Token balances, NFT holdings, block details - one price, one call, one response.

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Dynamic pricing

Endpoints that return variable-length data (transaction histories, event logs) use tiered pricing. You select a tier upfront based on how much data you expect:
TierItemsYou pay for …
Small1-5050 items
Medium51-200200 items
Large201-500500 items
XL501+1000 items
If the response contains fewer items than your tier covers, you overpaid slightly but get the data immediately. If it contains more, you get a 402 telling you exactly which tier you need.

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x402 vs API key

x402 (Pay-per-call)

  • No signup or account needed
  • Pay per request with a wallet
  • Ideal for AI agents and autonomous workflows
  • Live on Base Sepolia testnet

API Key (Subscription)

  • Predictable monthly cost
  • API key for any project
  • Ideal for apps with steady usage
  • For Vibe Coders or Teams
Both paths give you the same data, the same endpoints, and the same response format. Pick the one that fits how you build.