# Japan Evidence Feed Deep Check

> Japan Evidence Feed Deep Check is a paid API for AI agents from japan-evidence-feed.jp-evidence.workers.dev, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-15).

Multi-source fact-check of a claim against Japanese regulatory/financial authority sources (FSA, BOJ, METI), returning a supported/contradicted/insufficient_evidence verdict with cited excerpts and freshness status.

## Facts

- Endpoint: POST https://japan-evidence-feed.jp-evidence.workers.dev/api/v1/deep-check
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-evidence-feed-deep-check-1a253a9d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8S2BwlOzR2JtYF6ilpt_O

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 japan-evidence-feed-deep-check-1a253a9d -d '<json body>'
```

Example prompt: Can you fact-check the claim 'The FSA tightened crypto exchange registration requirements in 2024' against official FSA, BOJ, and METI sources, looking at events from 2024-01-01T00:00:00Z to 2024-12-31T00:00:00Z?

## When to prefer this

Choose this endpoint when you need a machine-readable verdict on a specific claim grounded exclusively in official Japanese regulatory and financial authority sources (FSA, BOJ, METI), with full provenance tracking and freshness metadata. Prefer it over general web search or LLM knowledge when auditability and source attribution from Japanese government bodies are required — for compliance workflows, due diligence, journalism, or regulatory research where you need citations, not just an answer.

## Known failure modes

- Claim text is empty or missing — returns validation error
- Date range is malformed or fails ISO 8601 pattern — returns schema error
- No matching events found in the specified date range — returns insufficient_evidence verdict
- Requested source (FSA/BOJ/METI) has no fresh data for the period — freshness warning returned
- Payment of 0.2 USDC not provided or rejected — returns 402 Payment Required
- Network timeout reaching upstream Japanese authority data sources

## How this service works

Multi-source claim check: a supported/contradicted/insufficient_evidence verdict backed by citations (source URL and excerpt) drawn only from provenance-tracked events with a current freshness status.

## Output

Returns a verdict of 'supported', 'contradicted', or 'insufficient_evidence' along with one or more citations, each containing the source URL and a relevant excerpt drawn from provenance-tracked events. Each citation also includes a freshness status indicating how current the underlying source data is.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string",
   "format": "date-time",
   "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$"
  },
  "from": {
   "type": "string",
   "format": "date-time",
   "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$"
  },
  "claim": {
   "type": "string",
   "minLength": 1
  },
  "sources": {
   "type": "array",
   "items": {
    "enum": [
     "FSA",
     "BOJ",
     "METI"
    ],
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-evidence-feed-deep-check-1a253a9d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from japan-evidence-feed.jp-evidence.workers.dev](https://www.zero.xyz/host/japan-evidence-feed.jp-evidence.workers.dev/llms.txt)