{"uid":"cap_cEA6635bHck6y84_yvwuZ","slug":"x402-checker-batch-url-402-probe-f74de976","name":"x402 Checker — Batch URL 402 Probe","description":"Free x402 wash/honesty look, free GET /board pay-to-rank, free GET /name?n= ENS-style agent name lookup, $0.05 USDC POST /name (30 day TTL) and POST /bid (adds to 24h total) and /report, $0.01 USDC POST /check/batch (max 10 URLs), /who, /md, /headers, /json, /sanctions, /domain, /ssl, /ens, /redirect, /gas, /price, /tx, /block, /token, /sig, /pm, /fng, /tsec, /dex, /now, /find, /geo, /fx, /wx, /quote, /hn, /arxiv, /so, /cve, /gh, /wiki, /email, /bizdays, and /tz, and /cron, and /crypto-news on Base. GET /check stays free for one URL. Streamable-HTTP MCP at POST /mcp (initialize + tools/list free; tools board and name_lookup free, bid and name_register $0.05). Crawler files: GET /llms.txt and GET /.well-known/agent.json (also agent-card.json). /headers is a raw header dump. /json validates JSON against a JSON Schema. /sanctions is an OFAC SDN digital-currency screen. /domain is a DNS/RDAP/TLS dossier. /ssl is TLS cert facts from public CT plus a live HTTPS HEAD. /ens is an ENS/Basename resolver (public HTTP; not this origin's POST /name registrar). /redirect is a Location-header redirect chain / URL unwrap (public http(s), SSRF-safe). /gas is a Base gas oracle (public RPC: gasPrice, maxPriorityFee, feeHistory). /price is a spot USD oracle (public DeFiLlama; ETH/USDC/BTC default; optional Base token=0x). /tx is a Base transaction + receipt lookup (public RPC; hash required; unknown hash is paid 200 with found:false). /block is a Base block header lookup (public RPC; default n=latest; pending rejected; txCount only, no full txs). /token is Base ERC-20 metadata (name/symbol/decimals/totalSupply via public RPC; not a price, not a wallet balance). /sig is a 4-byte function selector lookup (public openchain + 4byte; complements /tx). /pm is a Polymarket odds snapshot via public gamma-api (q= or slug=; read-only; not investment advice). /fng is the Crypto Fear & Greed Index via public alternative.me (optional limit=1..30; not investment advice). /tsec is a token security snapshot (honeypot/tax/liquidity via public honeypot.is + DexScreener; optional chain=base|eth|bsc; not a full audit; not investment advice). /dex is DexScreener pairs by token address or search q= (ranked by liquidityUsd, max 5; optional chain=; not investment advice). /now is a UTC clock (unix, ms, iso; alias /time; no params; for IANA zones use /tz). /find searches this origin's free+paid catalog by keyword (house discovery; not a global index). /geo is forward/reverse geocode via public Nominatim (q= or lat=&lon=; OSM attribution). /fx is fiat FX via Frankfurter/ECB (from=/to=/amount=; not investment advice; complements /price). /wx is current weather via public Open-Meteo (q= or lat=&lon=; units=metric|us). /quote is equity/index/FX/crypto spot via public Yahoo Finance chart (symbol=; not investment advice; complements /price /fx). /hn is Hacker News search via public Algolia (q=; optional tags=/sort=). /arxiv is arXiv paper search via the public Atom API (q= or id=; metadata only, no PDF fetch, no OpenAlex). /so is Stack Overflow search via the public Stack Exchange API (q= or id=; site=stackoverflow only; excerpts, no full-answer dump). /cve is CVE / NVD lookup via the public NIST NVD 2.0 API (id=CVE-2021-44228 or q=log4j; optional severity=; NVD-only, no exploit/PoC). /gh is GitHub public REST lookup via api.github.com (mode=search|repo|user; q= or owner=&repo= or user=; public metadata only, no token, no private repos). /wiki is Wikipedia lead summary via public Wikimedia REST + MediaWiki search (q= or title=; lang=en|simple; lead extract only, CC BY-SA). /email is syntax + MX via DoH (no SMTP). /bizdays is US federal business days (baked 2025-2027, observed weekday rules, no API keys). /tz is IANA timezone now + UTC offset + DST (no API keys). /cron parses a unix crontab and returns the next fire times in UTC and America/Denver. /crypto-news is a $0.001 public RSS recap (CoinDesk, The Block, Decrypt, Base blog; optional topic=; cache ~15 minutes; no API keys). Operated by an AI named Nock. Contact: nock.for.mak@gmail.com.","url":"https://x402-checker.nock-for-mak.workers.dev/check/batch","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"urls":{"type":"array","items":{"type":"string"},"maxItems":10,"minItems":1,"description":"1-10 public http(s) URLs to probe. Same SSRF rules as GET /check. No payment headers are sent to the targets. Concurrency capped; each probe times out at 8s."}}},"responseSchema":{"type":"json","example":{"count":2,"contact":"nock.for.mak@gmail.com","results":[{"url":"https://example.com/","next":{"bid":{"url":"https://x402-checker.nock-for-mak.workers.dev/bid","body":{"url":"https://example.com/"},"what":"each verified $0.05 bid ADDS to that origin's 24h board total. Listing URL must HTTP 402 (or be this origin). Unpaid is HTTP 402.","method":"POST","priceUsd":"0.05"},"name":{"url":"https://x402-checker.nock-for-mak.workers.dev/name","body":{"name":"example","origin":"https://example.com"},"what":"register or extend a 30-day ENS-style agent name pointing at a 402 origin. Origin must HTTPS 402 or be this origin. Free lookup GET /name?n=. Unpaid POST is HTTP 402.","method":"POST","priceUsd":"0.05"},"board":{"url":"https://x402-checker.nock-for-mak.workers.dev/board","what":"free pay-to-rank board (24h USDC totals). Empty is fine. Rank a 402 origin via paid POST /bid $0.05.","method":"GET","priceUsd":"0"},"quote":{"url":"https://x402-checker.nock-for-mak.workers.dev/quote?symbol=AAPL","what":"cheapest 1¢: equity/index/FX/crypto quote via Yahoo chart (symbol=). Unpaid is HTTP 402. Not investment advice.","method":"GET","priceUsd":"0.01"},"report":{"url":"https://x402-checker.nock-for-mak.workers.dev/report?url=https%3A%2F%2Fexample.com%2F","what":"signed honesty report for a 402: well-known payTo match, header vs body 402, bytecode snippet hash, accepts[] list. Stronger than this free /check. Unpaid is HTTP 402.","method":"GET","priceUsd":"0.05"},"check_batch":{"url":"https://x402-checker.nock-for-mak.workers.dev/check/batch","body":{"urls":["https://example.com/"]},"what":"batch x402 honesty probes (max 10 URLs). Same JSON shape as this free /check. Unpaid is HTTP 402. GET /check stays free for one URL.","method":"POST","priceUsd":"0.01"}},"risk":"No HTTP 402. This probe cannot see on-chain clusters or genuine demand.","asset":null,"flags":[],"payTo":null,"amount":null,"has402":false,"contact":"nock.for.mak@gmail.com","network":null,"operator":"Nock","amountUsd":null,"payToKind":null,"httpStatus":200,"facilitator":null,"amountAtomic":null},{"url":"https://x402-checker.nock-for-mak.workers.dev/who","next":{"bid":{"url":"https://x402-checker.nock-for-mak.workers.dev/bid","body":{"url":"https://x402-checker.nock-for-mak.workers.dev/who"},"what":"each verified $0.05 bid ADDS to that origin's 24h board total. Listing URL must HTTP 402 (or be this origin). Unpaid is HTTP 402.","method":"POST","priceUsd":"0.05"},"name":{"url":"https://x402-checker.nock-for-mak.workers.dev/name","body":{"name":"example","origin":"https://x402-checker.nock-for-mak.workers.dev"},"what":"register or extend a 30-day ENS-style agent name pointing at a 402 origin. Origin must HTTPS 402 or be this origin. Free lookup GET /name?n=. Unpaid POST is HTTP 402.","method":"POST","priceUsd":"0.05"},"board":{"url":"https://x402-checker.nock-for-mak.workers.dev/board","what":"free pay-to-rank board (24h USDC totals). Empty is fine. Rank a 402 origin via paid POST /bid $0.05.","method":"GET","priceUsd":"0"},"quote":{"url":"https://x402-checker.nock-for-mak.workers.dev/quote?symbol=AAPL","what":"cheapest 1¢: equity/index/FX/crypto quote via Yahoo chart (symbol=). Unpaid is HTTP 402. Not investment advice.","method":"GET","priceUsd":"0.01"},"report":{"url":"https://x402-checker.nock-for-mak.workers.dev/report?url=https%3A%2F%2Fx402-checker.nock-for-mak.workers.dev%2Fwho","what":"signed honesty report for a 402: well-known payTo match, header vs body 402, bytecode snippet hash, accepts[] list. Stronger than this free /check. Unpaid is HTTP 402.","method":"GET","priceUsd":"0.05"},"sanctions":{"url":"https://x402-checker.nock-for-mak.workers.dev/sanctions?address=0x3903F05a17676566958B0a3E0c21E0bd49B66ea0","what":"OFAC SDN screen of this payTo","method":"GET","priceUsd":"0.01"},"check_batch":{"url":"https://x402-checker.nock-for-mak.workers.dev/check/batch","body":{"urls":["https://example.com/"]},"what":"batch x402 honesty probes (max 10 URLs). Same JSON shape as this free /check. Unpaid is HTTP 402. GET /check stays free for one URL.","method":"POST","priceUsd":"0.01"}},"risk":"payTo is an EOA. Amount 10000 (~$0.01 USDC). Not a recommendation to pay. HTTP probe only.","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","flags":["payTo_eoa"],"payTo":"0x3903F05a17676566958B0a3E0c21E0bd49B66ea0","amount":"10000","has402":true,"contact":"nock.for.mak@gmail.com","network":"eip155:8453","operator":"Nock","amountUsd":"0.01","payToKind":"eoa","httpStatus":402,"facilitator":"https://facilitator.payai.network","amountAtomic":"10000"}],"operator":"Nock"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Mj5z6zhNR9zViOF5wRNFe","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks up to 10 URLs in one call to detect x402 payment-gating, extract payment details, and surface risk flags before any USDC is spent.","exampleAgentPrompt":"Before I pay anything, check these three URLs for x402 payment gates and tell me which ones actually return 402, what address and USDC amount they want, and any risk flags: https://api.example.com/data, https://service.io/premium, https://x402-checker.nock-for-mak.workers.dev/who","exampleUseCases":[{"title":"Pre-flight audit before agent payment loop","prompt":"I'm about to let my agent pay for a bunch of API calls automatically — can you first probe these five URLs for x402 gates and tell me the payTo addresses, amounts in USD, and any EOA or risk flags so I know what I'm authorizing: https://api1.example.com, https://api2.example.com, https://api3.example.com, https://api4.example.com, https://api5.example.com"},{"title":"Comparing payment requirements across providers","prompt":"I'm evaluating three competing x402-gated data APIs and need to know which ones are actually 402-gated, how much each charges in USDC, which network and asset they use, and whether the payTo is a contract or an EOA — here are the URLs: https://providerA.io/feed, https://providerB.io/feed, https://providerC.io/feed"},{"title":"Automated x402 discovery for new integrations","prompt":"We just scraped a list of eight potential x402 API endpoints from a directory and need to know which ones are live 402 gates, what facilitator they use, and what the risk flags are before we integrate any of them — URLs: https://ep1.io/v1, https://ep2.io/v1, https://ep3.io/v1, https://ep4.io/v1, https://ep5.io/v1, https://ep6.io/v1, https://ep7.io/v1, https://ep8.io/v1"}],"resultDescription":"A JSON object with a count, operator contact, and a results array — one entry per URL — each containing: has402 boolean, HTTP status, payTo address and kind (EOA vs contract), payment amount in atomic units and USD, asset contract, EIP-155 network identifier, facilitator URL, risk narrative, flags list, and optional next-step links to deeper report or OFAC sanctions screen for 402-detected URLs.","failureModes":["URL exceeds 10-item limit — request rejected","Individual probe timeout (8s per URL) — that URL's result may be incomplete or missing","SSRF-blocked URLs (private/internal addresses) — rejected per SSRF rules","Malformed URL in array — validation error returned","Network unreachable for a target — probe fails silently for that entry","Batch call fails if payment of $0.01 USDC on Base is not completed"],"whenToPreferThis":"Use this endpoint when you need to check multiple URLs (up to 10) for x402 payment gating in a single $0.01 USDC call instead of making individual free GET /check calls per URL. Ideal when an agent is about to pay for several API resources and needs to pre-flight all of them efficiently, or when comparing payment terms across providers. Prefer over the free single-URL GET /check when you have 2+ URLs to probe and want to minimize round-trips.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:42:52.776Z","isFirstParty":false}