All five feeds authenticate with the same access key. Pass it as ?key=YOUR_KEY on paid endpoints, or as Authorization: Bearer YOUR_KEY.
Paid routes return HTTP 402 Payment Required with an X-PAYMENT-REQUIRED header describing the cost. The agent settles USDC on Base through the x402 facilitator (P2P, 0% commission) and retries with the receipt. No wallet for the agent? Use a human key instead.
Pick a plan on /pricing, send the exact USDC amount to the shown address, and the key is issued automatically. Hobby $9/mo, Pro $99/mo, Business $499/mo, Enterprise $2000/mo. One-time products: $19 / $49 / $79 / $199 / $499.
Every feed has a free snapshot endpoint — no key, no signup, unlimited lookups. Try them live.