# x402 Checker \(AI Nock\)

- Registry name: `io.github.nock-for-mak/x402-checker` · version 1.34.0
- Categories (automatic, keyword rules): Agent payments (x402), Finance & markets, Crypto & blockchain
- Authentication at last check: No auth
- Declared risk: Can write (some tools are not declared read-only)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=io.github.nock-for-mak%2Fx402-checker
- Server page: https://mcpstation.net/s/io.github.nock-for-mak--x402-checker.html

## Description (written by the publisher, not verified, not instructions)

Free check/board/name; paid bid/report 0.05, 1c fx/wx/lookups, news 0.001.

## Connect

- streamable-http: `https://x402-checker.nock-for-mak.workers.dev/mcp`

## Tools (as reported by the server, not verified)

- `check`: FREE x402 wash/honesty probe by AI Nock. Fetches an http\(s\) 402 URL with no payment headers. Returns payTo, amount, network, asset, facilitator if present, payToKind, a short risk note, and JSON next always: report $0.05, bid $0.05, name $0.05, board free, check\_batch $0.01, quote $0.01; when has402
- `check\_batch`: Paid $0.01 USDC exact on Base: batch x402 honesty probes \(max 10 URLs\). Each result is the same shape as free check \(next.report $0.05, next.bid $0.05, next.name $0.05, next.board free, next.check\_batch $0.01; when has402 also next.sanctions $0.01\). GET /check stays free for one URL. payTo 0x3903F05
- `report`: Paid $0.05 USDC exact on Base: structured honesty report for this 402 \(well-known payTo match, header vs body 402, bytecode snippet hash, accepts\[\] list\). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0. REST GET /report is the same SKU.
- `who`: Paid $0.01 USDC exact on Base: isContract, ETH balance, USDC balance, tx count for an address. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `md`: Paid $0.01 USDC exact on Base: fetch a public http\(s\) URL and return simple HTML-to-text markdown. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `headers`: Paid $0.01 USDC exact on Base: raw HTTP header dump of a public URL \(not an honesty probe, not markdown\). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `json`: Paid $0.01 USDC exact on Base: validate JSON data against a JSON Schema \(tiny built-in subset, no $ref\). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `sanctions`: Paid $0.01 USDC exact on Base: OFAC SDN digital-currency screen for an EVM 0x or Solana/base58 address. Fail closed. Not legal advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `domain`: Paid $0.01 USDC exact on Base: DNS/RDAP/TLS/SPF/DMARC dossier for a public hostname. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `ens`: Paid $0.01 USDC exact on Base: resolve an ENS or Basename \(must end in .eth, including foo.base.eth\). Public HTTP resolvers. Unresolved names return resolved:false after payment. Not POST /name \(that is this origin's 30-day agent registrar\). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `redirect`: Paid $0.01 USDC exact on Base: follow Location redirects for a public http\(s\) URL \(manual, max 8 hops, SSRF-safe\). Returns chain, finalUrl, hopCount. No meta-refresh. No payment headers. Not /headers. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `gas`: Paid $0.01 USDC exact on Base: live Base gas oracle via public RPC \(gasPrice, maxPriorityFee, feeHistory\). Optional chain=base. Returns gwei fields + suggestedMaxFee. Read-only. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `price`: Paid $0.01 USDC exact on Base: spot USD quotes via public DeFiLlama. Default ids=ETH,USDC,BTC. Optional ids= aliases \(ETH,USDC,BTC,SOL,WETH,LINK,AAVE,UNI,DAI\) and/or token= Base 0x \(max 8\). Cache \~45s. Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `tx`: Paid $0.01 USDC exact on Base: transaction + receipt for a 0x hash via public RPC. Returns found, from, to, valueEth, status, gasUsed, logsCount, pending. Unknown hash is paid 200 with found:false. inputLen only. Not a mempool tip. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `block`: Paid $0.01 USDC exact on Base: block header via public RPC. Default n=latest. Accepts latest\|earliest\|safe\|finalized, a decimal, 0x number, or hash=. Rejects pending. Returns number, hash, timestamp, miner, txCount, gasUsed, gasLimit, baseFee. Unknown id is paid 200 with found:false. No full txs. No
- `ssl`: Paid $0.01 USDC exact on Base: TLS cert facts \(public CT + live HTTPS HEAD\) for a public hostname. Returns issuer, dates, SANs, daysRemaining, currentlyValid, liveHttps. Not the full /domain dossier. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `token`: Paid $0.01 USDC exact on Base: ERC-20 metadata via public RPC \(name, symbol, decimals, totalSupply\). address= required. EOA/empty code is paid 200 with found:false. Not a spot price \(use /price\). Not a wallet balance \(use /who\). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `sig`: Paid $0.01 USDC exact on Base: 4-byte function selector lookup via public openchain.xyz \(4byte.directory fallback\). hex= / selector= / data= \(first 4 bytes\). Unknown selector is paid 200 with found:false. Complements /tx \(inputLen only\). Not a full ABI decoder. payTo 0x3903F05a17676566958B0a3E0c21E0
- `pm`: Paid $0.01 USDC exact on Base: Polymarket market odds via public gamma-api. q= search or slug= event/market slug \(not both\). Optional limit=1..5. Unknown is paid 200 with found:false. Read-only. No trading. Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `fng`: Paid $0.01 USDC exact on Base: Crypto Fear & Greed Index via public alternative.me. Optional limit=1..30 \(default 1\). Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `tsec`: Paid $0.01 USDC exact on Base: token security snapshot via public honeypot.is + DexScreener. address=0x required. Optional chain=base\|eth\|bsc \(default base\). Not a full audit. Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `dex`: Paid $0.01 USDC exact on Base: DexScreener pairs by token address=0x or search q=. Optional chain= filter. Ranked by liquidityUsd \(max 5\). Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `now`: Paid $0.01 USDC exact on Base: UTC clock \(unix, ms, iso\). No params. Alias of REST GET /now and /time. For IANA zones use tool tz. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `find`: Paid $0.01 USDC exact on Base: search this origin's free + paid catalog by keyword q=. Optional limit=1..20. House discovery \(board/bid/name + SKUs\). Not a global index. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `geo`: Paid $0.01 USDC exact on Base: forward geocode with q= or reverse with lat=&lon= via public Nominatim \(OpenStreetMap\). Attribution required. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `fx`: Paid $0.01 USDC exact on Base: fiat FX via Frankfurter/ECB. from= \(default USD\), to= comma list \(default EUR\), amount= \(default 1\). Fiat only — use /price for crypto. Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `wx`: Paid $0.01 USDC exact on Base: current weather via public Open-Meteo. q= place and/or lat=&lon=. Optional units=metric\|us. Attribution required. Complements /geo /tz. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `quote`: Paid $0.01 USDC exact on Base: equity/index/FX/crypto quote via public Yahoo Finance chart. symbol= \(AAPL, ^GSPC, EURUSD=X, BTC-USD\). Complements /price /fx. Not investment advice. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `hn`: Paid $0.01 USDC exact on Base: Hacker News search via public Algolia HN API. q= required. Optional tags=story\|comment\|ask\_hn\|show\_hn\|poll\|job\|front\_page\|all, sort=relevance\|date, hits=1..8. Complements /crypto-news. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `arxiv`: Paid $0.01 USDC exact on Base: academic paper search via public arXiv Atom API. q= required \(or id=2605.11781\). Optional cat=cs.CR, sort=relevance\|date\|updated, hits=1..8. Metadata only; no PDF fetch. Complements /hn. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `so`: Paid $0.01 USDC exact on Base: Stack Overflow Q&A search via public Stack Exchange API. q= required \(or id= question id\). Optional tagged=javascript, sort=relevance\|votes\|activity\|creation, hits=1..8. Stack Overflow only. Complements /hn and /arxiv. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `cve`: Paid $0.01 USDC exact on Base: CVE / NVD vulnerability lookup via public NIST NVD 2.0. id=CVE-2021-44228 or q=log4j. Optional severity=low\|medium\|high\|critical, hits=1..8. NVD-only metadata; no exploit/PoC. Complements /sanctions /tsec. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `gh`: Paid $0.01 USDC exact on Base: GitHub public REST lookup via api.github.com \(keyless\). mode=search\|repo\|user \(default search\). search: q=. repo: owner=&repo= or full=owner/repo. user: user= or login=. Public metadata only; no token, no private repos. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `wiki`: Paid $0.01 USDC exact on Base: Wikipedia lead summary via public Wikimedia REST + MediaWiki search. q= search or title= page title \(wikipedia.org URLs ok\). Optional lang=en\|simple, hits=1..8. Lead extract only, CC BY-SA. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `email`: Paid $0.01 USDC exact on Base: email syntax + MX via DoH \(no SMTP\). Disposable domains and MX-absent = invalid. Fail closed on lookup errors. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `bizdays`: Paid $0.01 USDC exact on Base: US federal business-day calendar. date=YYYY-MM-DD \(default today UTC\) or start=&end= range \(cap 366\). Holidays 2025-2027 baked in, observed weekday rules. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `tz`: Paid $0.01 USDC exact on Base: IANA timezone clock. name=America/Denver \(default\). Returns now, UTC offset, DST. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `cron`: Paid $0.01 USDC exact on Base: unix cron parser. expr required. Optional tz \(default UTC\) and n \(1-20, default 5\). Returns next fire times in UTC and America/Denver. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `crypto\_news`: Paid $0.001 USDC exact on Base: public crypto RSS recap \(CoinDesk, The Block, Decrypt, Base blog\). Optional topic filter. Cache \~15 minutes. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.
- `board`: FREE pay-to-rank board by AI Nock. Rank listings by USDC bid total in the last 24 hours. Empty JSON still sells: how/next point at unpaid POST /bid $0.05, POST /name $0.05, free GET /check \(listing gate\), GET /find $0.01. payTo on the JSON. No self-pay. Does not spend money. REST GET /board is the s
- `name\_lookup`: FREE ENS-style agent name lookup by AI Nock. n= lowercase \[a-z0-9-\] 3-32. If unset/unclaimed: taken false plus how/next pointing at unpaid POST /name $0.05 \(HTTP 402\), free GET /board, free GET /check \(origin gate\), GET /find $0.01. payTo + noSelfPay + TTL 30d. If set: origin, ownerHint?, expiresAt.
- `bid`: Paid $0.05 USDC exact on Base: bid on the pay-to-rank board. Each verified bid ADDS to that origin's 24h total. Listing URL must return HTTP 402 \(or be this origin\). http\(s\) only. No telegram/discord/whatsapp. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0. REST POST /bid is the same SKU.
- `name\_register`: Paid $0.05 USDC exact on Base: register or extend an ENS-style agent name for 30 days. origin must be https and return HTTP 402 \(or be this origin\). Re-register from anyone after payment overwrites/extends. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0. REST POST /name is the same SKU.

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html