x402-protocol-integration

Should I pay this x402 endpoint? Pre-payment honesty check for AI agents: live-probe any resource URL for a valid 402 Payment Required challenge, match payTo and budget, return allow/caution/block with signals. Bazaar seller readiness before spend. Not post-payment delivery proof. $0.005 USDC on Base.

Retrieve a stored x402 Doctor report again by its id ($0.01): the full report of a test purchase, price lookup or cached result, exactly as first delivered. Only the wallet that paid for the original call can retrieve it; reports are kept 365 days.

Check a captured x402 402 for indexing and payment blockers — no fetch

Highest-demand x402 services tagged 'fun': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 18 providers and 434 paying wallets measured in this tag.

Highest-demand x402 services tagged 'wallet-intel': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 36 providers and 45 paying wallets measured in this tag.

Highest-demand x402 services tagged 'search': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 160 providers and 524 paying wallets measured in this tag.

Highest-demand x402 services tagged 'defi': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 257 providers and 591 paying wallets measured in this tag.

Returns information about merchants participating in a payment or transaction network.

Overall high-level facilitator stats

All-in-one trust intelligence for x402 services: the complete validation dataset (100+ services graded A-F with real purchase tests, on-chain proof tx hashes, response quality and a how-to-buy guide) PLUS, if you send a 'resource' URL, a fresh verification of that service (passive probe + real micro-purchase + LLM grade) included in the same response.

Highest-demand x402 services tagged 'evidence': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 743 providers and 765 paying wallets measured in this tag.

Token safety & rug check — on-chain honeypot/tax/owner-privilege/holder-concentration risk verdict for any EVM token (GoPlus + DexScreener). Pay-per-call via x402. An empty body is answered for USDC on Base (the x402 settlement asset); send {"token":"0x…"} for any other token.

Verify a completed Base USDC x402 exact-scheme settlement from its transaction hash. Reads the public Base receipt and transaction, confirms EIP-3009 payment shape, decodes USDC Transfer events, reports confirmation depth, and optionally...

No-body $0.001 x402 settlement test for funded agents. Verifies the buyer wallet, facilitator, USDC payment path, and paid delivery end-to-end by returning a timestamped pong only after successful settlement.

x402 Doctor for a block you hit (e.g. 403): we request the seller ourselves and say whether the block is on your path (IP, region, bot wall) or on the seller side, with what each of us saw. We never buy around a block.

x402 Doctor: why a payment failed, in plain words: the cause, whose side it is on (your client, your wallet, the network, the seller or the facilitator) and how to fix it, from over 40 named causes (x402 and Coinbase facilitator codes, EVM and Solana, HTTP and network errors). Send the seller 402 as challenge and the error as response, by POST JSON or GET query. Unknown failures are reviewed nightly.

Highest-demand x402 services tagged 'analytics': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 128 providers and 396 paying wallets measured in this tag.

Where a live x402 resource stands with the registries — Bazaar, x402scan, and on-chain

x402 protocol check: confirms payment and returns a timestamp. Returns no data — for real data see GET /dao-proposals.

Live conformance check of an x402 endpoint (Solana or Base) before you pay it

Base x402 spending report

Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.

x402 Doctor checkup of any x402 endpoint, without buying: whether it answers with a valid payment request, its x402 version and any problems in it, the prices and networks it asks for, its payTo wallets and response time.

Checks one http(s) URL without paying it: whether it returns a valid x402 payment challenge, its USDC price against the median of its category, the payTo wallets and their USDC received in the last 30 days where our collector has them, and our own probe history (uptime since first seen). Signals with sources; a factual report, not a safety verdict.