# x402 Checker (AI Nock) (remote · x402-checker.nock-for-mak.workers.dev)

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

- Trust score: 74/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `x402-checker.nock-for-mak.workers.dev`: 74/100 (this document), [markdown](https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker.md), [page](https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker)

## Channel facts

- Endpoint: `https://x402-checker.nock-for-mak.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.34.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 43 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS check failed: the endpoint is reachable over plaintext HTTP.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 6033 tokens (~140/item across 43 items; 43 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 43 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 44 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the x402 Checker (AI Nock) MCP server?

x402 Checker (AI Nock) is a hosted endpoint at https://x402-checker.nock-for-mak.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http nock-for-mak-x402-checker 'https://x402-checker.nock-for-mak.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "nock-for-mak-x402-checker": {
      "url": "https://x402-checker.nock-for-mak.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "nock-for-mak-x402-checker": {
      "type": "http",
      "url": "https://x402-checker.nock-for-mak.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.nock-for-mak-x402-checker]
url = "https://x402-checker.nock-for-mak.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "nock-for-mak-x402-checker": {
      "type": "remote",
      "url": "https://x402-checker.nock-for-mak.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add nock-for-mak-x402-checker --url 'https://x402-checker.nock-for-mak.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  nock-for-mak-x402-checker:
    url: "https://x402-checker.nock-for-mak.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "nock-for-mak-x402-checker": {
      "Transport": "http",
      "Url": "https://x402-checker.nock-for-mak.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add nock-for-mak-x402-checker -t streamable-http -u 'https://x402-checker.nock-for-mak.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "nock-for-mak-x402-checker": {
      "type": "http",
      "url": "https://x402-checker.nock-for-mak.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-18 (score 74, +1)

- [security] Stability: 0.97 → pass

### 2026-09-16 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-14 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-12 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-08 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-05 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-03 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (43)

### `check` (~152 tokens)

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, report/bid URLs are prefilled and next.sanctions $0.01. Use before paying any x402 resource. Does not spend money.

Input parameters:

- `url` (string, required): http(s) URL to inspect. No payment headers are sent to the target.

### `check_batch` (~170 tokens)

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 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0. REST POST /check/batch is the same SKU.

Input parameters:

- `urls` (array, required): 1-10 public http(s) URLs. Same SSRF-safe rules as check. No payment headers are sent to the targets.

### `report` (~109 tokens)

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.

Input parameters:

- `url` (string, required): http(s) URL to inspect. No payment headers are sent to the target.

### `who` (~93 tokens)

Paid $0.01 USDC exact on Base: isContract, ETH balance, USDC balance, tx count for an address. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `address` (string, required): 0x-prefixed 20-byte EVM address on Base (or Solana/base58 for sanctions).

### `md` (~86 tokens)

Paid $0.01 USDC exact on Base: fetch a public http(s) URL and return simple HTML-to-text markdown. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `url` (string, required): http(s) URL to inspect. No payment headers are sent to the target.

### `headers` (~88 tokens)

Paid $0.01 USDC exact on Base: raw HTTP header dump of a public URL (not an honesty probe, not markdown). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `url` (string, required): http(s) URL to inspect. No payment headers are sent to the target.

### `json` (~88 tokens)

Paid $0.01 USDC exact on Base: validate JSON data against a JSON Schema (tiny built-in subset, no $ref). payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `data` (required): JSON instance object or JSON text
- `schema` (required): JSON Schema object or JSON text

### `sanctions` (~106 tokens)

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.

Input parameters:

- `address` (string, required): 0x-prefixed 20-byte EVM address on Base (or Solana/base58 for sanctions).

### `domain` (~83 tokens)

Paid $0.01 USDC exact on Base: DNS/RDAP/TLS/SPF/DMARC dossier for a public hostname. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `host` (string, required): Public DNS hostname (not a URL, not an IP).

### `ens` (~119 tokens)

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.

Input parameters:

- `name` (string, required): ENS name ending in .eth (vitalik.eth, foo.base.eth).

### `redirect` (~106 tokens)

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.

Input parameters:

- `url` (string, required): Public http(s) URL to unwrap.

### `gas` (~105 tokens)

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.

Input parameters:

- `chain` (string): Chain short name. Optional; only base for now.

### `price` (~155 tokens)

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.

Input parameters:

- `ids` (string): Comma-separated symbols. Default ETH,USDC,BTC. Max 8.
- `token` (string): Optional Base ERC-20 0x address.

### `tx` (~121 tokens)

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.

Input parameters:

- `hash` (string, required): 0x-prefixed 32-byte transaction hash on Base.

### `block` (~161 tokens)

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. Not a mempool tip. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `hash` (string): Optional 0x-prefixed 32-byte block hash.
- `n` (string): Block tag or number. Default latest.

### `ssl` (~107 tokens)

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.

Input parameters:

- `host` (string, required): Public DNS hostname (not a URL, not an IP).

### `token` (~123 tokens)

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.

Input parameters:

- `address` (string, required): 0x-prefixed 20-byte ERC-20 contract address on Base.

### `sig` (~131 tokens)

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 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `hex` (string, required): 0x-prefixed 4-byte selector, or longer calldata (first 4 bytes used).

### `pm` (~162 tokens)

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.

Input parameters:

- `limit` (integer): Max markets 1-5 (default 5).
- `q` (string): Search query (max 80). Use q or slug, not both.
- `slug` (string): Exact Polymarket event or market slug (lowercase [a-z0-9-]).

### `fng` (~95 tokens)

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.

Input parameters:

- `limit` (integer): History length 1-30 (default 1 = current).

### `tsec` (~126 tokens)

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.

Input parameters:

- `address` (string, required): Token contract 0x + 40 hex.
- `chain` (string): base, eth, or bsc (default base).

### `dex` (~129 tokens)

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.

Input parameters:

- `address` (string): Token contract 0x + 40 hex (token mode).
- `chain` (string): Optional chain filter (default base for address mode).
- `q` (string): Search query (search mode).

### `now` (~79 tokens)

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` (~120 tokens)

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.

Input parameters:

- `limit` (integer): Max results 1..20 (default 8).
- `q` (string, required): Search keywords (e.g. gas, token security, board).

### `geo` (~127 tokens)

Paid $0.01 USDC exact on Base: forward geocode with q= or reverse with lat=&lon= via public Nominatim (OpenStreetMap). Attribution required. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `lat` (number): Latitude -90..90 for reverse geocode.
- `lon` (number): Longitude -180..180 for reverse geocode.
- `q` (string): Place name for forward geocode (e.g. Denver, CO).

### `fx` (~136 tokens)

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.

Input parameters:

- `amount` (number): Amount of from-currency (default 1).
- `from` (string): Base ISO currency (default USD).
- `to` (string): Quote ISO currencies, comma-separated (default EUR).

### `wx` (~137 tokens)

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.

Input parameters:

- `lat` (number): Latitude -90..90.
- `lon` (number): Longitude -180..180.
- `q` (string): Place name (e.g. Denver, CO).
- `units` (string): metric (default) or us.

### `quote` (~124 tokens)

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.

Input parameters:

- `symbol` (string, required): Ticker: equity (AAPL), index (^GSPC), FX (EURUSD=X), crypto (BTC-USD).

### `hn` (~180 tokens)

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.

Input parameters:

- `hits` (integer): 1..8 results (default 5).
- `q` (string, required): Search phrase (aliases query= search=).
- `sort` (string): relevance (default) or date.
- `tags` (string): story (default), comment, ask_hn, show_hn, poll, job, front_page, or all.

### `arxiv` (~205 tokens)

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.

Input parameters:

- `cat` (string): arXiv category, e.g. cs.CR or cs.AI.
- `hits` (integer): 1..8 results (default 5).
- `id` (string): arXiv id (2605.11781 or arXiv:2605.11781).
- `q` (string): Search phrase (aliases query= search=). Required unless id=.
- `sort` (string): relevance (default), date, or updated.

### `so` (~185 tokens)

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.

Input parameters:

- `hits` (integer): 1..8 results (default 5).
- `id` (string): Stack Overflow question id (digits).
- `q` (string): Search phrase (aliases query= search=). Required unless id=.
- `sort` (string): relevance (default), votes, activity, or creation.
- `tagged` (string): Up to 3 tags, comma-separated.

### `cve` (~206 tokens)

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.

Input parameters:

- `hits` (integer): 1..8 results (default 5).
- `id` (string): CVE id (CVE-YYYY-NNNN). Aliases cve= cve_id=. Required unless q=.
- `q` (string): Keyword search (aliases query= search= keyword=). Required unless id=.
- `severity` (string): low, medium, high, or critical.

### `gh` (~229 tokens)

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.

Input parameters:

- `full` (string): owner/repo or github.com/owner/repo URL.
- `hits` (integer): 1..8 results (default 5).
- `mode` (string): search (default), repo, or user.
- `owner` (string): GitHub owner/org. Use with repo=.
- `q` (string): Repo search query (aliases query= search=). Required for mode=search.
- `repo` (string): GitHub repository name. Use with owner=.
- `user` (string): GitHub login (aliases login=). For mode=user.

### `wiki` (~167 tokens)

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.

Input parameters:

- `hits` (integer): 1..8 search results (default 5).
- `lang` (string): en (default) or simple.
- `q` (string): Search query (aliases query= search=). Required unless title=.
- `title` (string): Direct page title or wikipedia.org/wiki/Title URL. Alias page=.

### `email` (~96 tokens)

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.

Input parameters:

- `addr` (string, required): Email address (local@public-hostname). Max 254 chars.

### `bizdays` (~165 tokens)

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.

Input parameters:

- `date` (string): YYYY-MM-DD. Optional; default today UTC.
- `end` (string): Range end YYYY-MM-DD (inclusive). Requires start. Cap 366 days.
- `start` (string): Range start YYYY-MM-DD (inclusive). Requires end.
- `tz` (string): IANA timezone. Default America/Denver.

### `tz` (~92 tokens)

Paid $0.01 USDC exact on Base: IANA timezone clock. name=America/Denver (default). Returns now, UTC offset, DST. No API keys. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Input parameters:

- `name` (string): IANA timezone name. Optional; default America/Denver.

### `cron` (~148 tokens)

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.

Input parameters:

- `expr` (string, required): Unix crontab 5-field (minute hour day-of-month month day-of-week).
- `n` (integer): Next fire count 1-20. Default 5.
- `tz` (string): IANA timezone the cron is interpreted in. Default UTC.

### `crypto_news` (~102 tokens)

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.

Input parameters:

- `topic` (string): Optional case-insensitive filter on title/summary/source. Max 80 chars.

### `board` (~99 tokens)

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 same SKU.

### `name_lookup` (~156 tokens)

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. Does not spend money. REST GET /name is the same SKU.

Input parameters:

- `n` (string): Agent name to look up (lowercase [a-z0-9-] 3-32).
- `name` (string): Alias of n.

### `bid` (~187 tokens)

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.

Input parameters:

- `description` (string): Optional one-line description. Max 200 chars.
- `name` (string): Optional short name. Max 80 chars.
- `slot` (string): Optional slot. Max 40 chars.
- `topic` (string): Optional topic. Max 40 chars.
- `url` (string, required): http(s) listing URL that returns HTTP 402, or this origin.

### `name_register` (~161 tokens)

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.

Input parameters:

- `name` (string, required): lowercase [a-z0-9-] 3-32 chars, no leading/trailing hyphen.
- `origin` (string, required): https URL that returns HTTP 402, or this origin.
- `ownerHint` (string): Optional short owner hint. Max 80 chars.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker#diagnostics

## Score history

- 2026-09-20: 74
- 2026-09-19: 74
- 2026-09-18: 74
- 2026-09-17: 73
- 2026-09-16: 73
- 2026-09-15: 72
- 2026-09-14: 72
- 2026-09-13: 71
- 2026-09-12: 71
- 2026-09-11: 70
- 2026-09-10: 70
- 2026-09-09: 69
- 2026-09-08: 69
- 2026-09-07: 68
- 2026-09-06: 68
- 2026-09-05: 68
- 2026-09-04: 67
- 2026-09-03: 67
- 2026-09-02: 66
- 2026-09-01: 66
- 2026-08-31: 65
- 2026-08-30: 65
- 2026-08-29: 64
- 2026-08-28: 64
- 2026-08-27: 63
- 2026-08-26: 63
- 2026-08-25: 61
- 2026-08-24: 61
- 2026-08-23: 60
- 2026-08-22: 60

## Common questions

### What is the x402 Checker (AI Nock) MCP server?

x402 Checker (AI Nock) is an MCP server listed in the public MCP registry as io.github.nock-for-mak/x402-checker. Free check/board/name; paid bid/report 0.05, 1c fx/wx/lookups, news 0.001. This page covers its hosted endpoint (https://x402-checker.nock-for-mak.workers.dev/mcp).

### Is the x402 Checker (AI Nock) MCP server safe to use?

x402 Checker (AI Nock) scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the x402 Checker (AI Nock) MCP server expose?

x402 Checker (AI Nock) exposes 43 tools: check, check_batch, report, who, md, and 38 more. Their descriptions and schemas cost roughly 5,716 tokens of context every time the server is loaded.

### Does the x402 Checker (AI Nock) MCP server require authentication?

No. We connected to x402 Checker (AI Nock) without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the x402 Checker (AI Nock) MCP server still maintained?

x402 Checker (AI Nock) is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://x402-checker.nock-for-mak.workers.dev/mcp
- Repository: https://github.com/nock-for-mak/skills
- Website: https://nock-for-mak.github.io/skills/
- Changelog RSS feed: https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker.xml
- Changelog JSON feed: https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker.json
- HTML version of this page: https://verifymcp.io/servers/nock-for-mak-x402-checker/x402-checker