# Paid resource data contract — 2026-10-05

Source: direct https://api.exa.ai/search, x402 V2 Solana exact USDC.
Reference: https://exa.ai/docs/integrations/payments/x402/quickstart
Actual unsigned discovery returned HTTP402, 7000 USDC base units, recipient
12Ec2cJmfR1C9uwejzxcuMhUgEC7wDrLgm1wBvvR5w9E, sponsored fee payer
BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP. A price offer is not a purchase.
Pinned SDK core/svm2.28.0 and Kit7.1.1; inspected SDK constructs TransferChecked,
compute-budget instructions and a random memo. No automatic wrapper/retry is used.

Money authority: finalized transaction, original signed message and wallet signature,
exact source/destination token balance changes. HTTP payment headers alone cannot
prove payment. Three immutable requests, primary-domain allowlist, bounded response.
Result gate: at least two unique HTTPS source URLs with nonempty titles on approved
primary domains. This proves a usable source list, not truth of every source claim.
Discovery limits require no polling. Persist quote/payment/dispatch intent/raw response
before next stage. Missing paid response stays held: Exa has no documented purchased
result retrieval endpoint. Recovery from a saved response makes no new paid request.
No OpenAI key, account credit or estimated fiat invoice participates in this route.

A later actual quote returned sponsor BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F. Sponsor rotates. The fixed HTTPS offer chooses a funded system account distinct from the payer/source/destination; the same sponsor must appear in signed/finalized bytes. Vendor and amount stay pinned.