Live scoring of x402 APIs — trust, uptime, latency and price from real traffic. Find the most reliable, cheapest source for any data, on Base or Solana.
x402 is an open HTTP standard built on the 402 Payment Required status code. A server answers a request with a 402 and a payment challenge; the caller pays on-chain (USDC on Base, Solana and others) and retries. It lets AI agents pay for APIs per call — no accounts, no API keys, no subscriptions.
x402radar indexes every x402 API and scores it from real usage and continuous synthetic checks — so an agent (or a developer) can pick the most reliable, cheapest source for any kind of data, and find equivalent fallbacks when one is down or too expensive.
The 0–100 Trust score is a weighted composite: uptime (30%), success rate (25%), latency (20%), price relative to its category (15%) and data freshness (10%). New APIs aren't penalised — instead we lower a separate confidence level until enough observations accumulate, and mark thin data as “provisional”.
Each API shows the chains it accepts. Base is the de-facto standard; Solana is the strong number two, with Polygon, Arbitrum and others behind. Browse by Base or Solana.
APIs are discovered automatically from real x402 traffic and on-chain settlements, and enriched with synthetic monitoring. Providers can submit an API to request verification and a richer profile.