# x402 Checker — US Federal Business Days Calculator

> x402 Checker — US Federal Business Days Calculator is a paid API for AI agents from x402-checker.nock-for-mak.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns whether a given date (or date range) is a US federal business day, including holiday name, next business day, and timezone-aware weekend labeling, for 2025–2027.

## Facts

- Endpoint: GET https://x402-checker.nock-for-mak.workers.dev/bizdays
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-checker-us-federal-business-days-calculator-5c13f787
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7z-PvAtMET7AjU8DXxVp9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-checker-us-federal-business-days-calculator-5c13f787
```

Example prompt: Is July 3rd 2026 a US federal business day, and if not, what's the next one? Use the America/Denver timezone.

## When to prefer this

Use this endpoint when you need authoritative, pre-baked US federal holiday and business day data for 2025–2027 without managing your own holiday calendar or external government APIs. Prefer it for payment scheduling, contract compliance, payroll, and SLA calculations where US federal observed weekday holiday rules matter. It requires no API key and is cheap ($0.01 USDC). Choose alternatives if you need international holiday calendars, state-level holidays, or dates beyond 2027.

## Known failure modes

- Missing required 'date' parameter defaults to today UTC — ensure explicit date if determinism required
- Range queries without both 'start' and 'end' will fail validation
- Ranges exceeding 366 days will be rejected (cap enforced)
- Invalid date format (non-YYYY-MM-DD) will return an error
- Invalid IANA timezone string will cause a lookup failure
- Dates outside 2025–2027 baked range may return inaccurate or unsupported results
- Payment of $0.01 USDC on Base required; underpayment will return 402

## How this service works

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.

## Output

Returns a JSON object containing: the queried date and timezone, whether it is a weekend (isWeekend), whether it is a US federal holiday (isUsFederalHoliday) and the holiday name if applicable, whether it is a business day (isBusinessDay), and the date of the next business day (nextBusinessDay). For range queries, returns an array of such objects for each date in the range.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "date",
      "start",
      "end",
      "tz"
     ],
     "properties": {
      "tz": {
       "type": "string",
       "description": "IANA timezone (default America/Denver) included in the JSON for weekend-in-zone labeling."
      },
      "end": {
       "type": "string",
       "description": "Range end YYYY-MM-DD (inclusive). Requires start."
      },
      "date": {
       "type": "string",
       "description": "YYYY-MM-DD. Optional; default today UTC."
      },
      "start": {
       "type": "string",
       "description": "Range start YYYY-MM-DD (inclusive). Requires end. Cap 366 days."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tz": "America/Denver",
  "date": "2026-07-03",
  "contact": "nock.for.mak@gmail.com",
  "operator": "Nock",
  "isWeekend": false,
  "holidayName": "Independence Day (observed)",
  "isBusinessDay": false,
  "nextBusinessDay": "2026-07-06",
  "isUsFederalHoliday": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-checker-us-federal-business-days-calculator-5c13f787/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-checker.nock-for-mak.workers.dev](https://www.zero.xyz/host/x402-checker.nock-for-mak.workers.dev/llms.txt)