# Japan Evidence Feed – Structured Event Search

> Japan Evidence Feed – Structured Event Search is a paid API for AI agents from japan-evidence-feed.jp-evidence.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Searches structured evidence events from Japan's FSA, BOJ, and METI with full provenance (source URL, sha256 hash, timestamps) and freshness status per result.

## Facts

- Endpoint: POST https://japan-evidence-feed.jp-evidence.workers.dev/api/v1/search
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-evidence-feed-structured-event-search-0d658d9c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AOZZcIyuX9c_uZBG6jYXv

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-structured-event-search-0d658d9c -d '<json body>'
```

Example prompt: Search the Japan evidence feed for BOJ and FSA events related to interest rate policy from 2024-10-01T00:00:00Z to 2025-01-01T00:00:00Z, return up to 20 results with their source URLs and freshness status.

## When to prefer this

Choose this endpoint when you need structured, provenance-verified evidence events from Japanese government agencies (FSA, BOJ, METI) with cryptographic integrity (sha256 hashes) and freshness tracking. Prefer this over generic web search when you need auditable, timestamped regulatory intelligence from Japan with source verification rather than unverified scraped text.

## Known failure modes

- Empty result set if no events match the query/date range combination
- Invalid date-time format returns validation error (must match ISO 8601 UTC pattern)
- Unknown source enum value (anything other than FSA, BOJ, METI) causes schema error
- Limit exceeding 50 returns an error; must be between 1 and 50
- Payment failure if x402 USDC payment of $0.01 is not processed before request
- Stale results if upstream agency pages have not been recently crawled

## How this service works

Structured search over evidence events with full provenance (source URL, sha256 snapshot hash, publish/detect timestamps) and a freshness status (current/stale) per event, across FSA, BOJ, and METI.

## Output

A list of structured evidence event records (up to the requested limit), each containing: event text/summary, originating agency (FSA/BOJ/METI), source URL, sha256 snapshot hash of the page, publish timestamp, detect timestamp, and a freshness status indicating whether the source is current or stale.

## 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))$"
  },
  "from": {
   "type": "string",
   "format": "date-time",
   "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$"
  },
  "limit": {
   "type": "integer",
   "default": 10,
   "maximum": 50,
   "minimum": 1
  },
  "query": {
   "type": "string"
  },
  "topics": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "sources": {
   "type": "array",
   "items": {
    "enum": [
     "FSA",
     "BOJ",
     "METI"
    ],
    "type": "string"
   }
  },
  "entities": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-evidence-feed-structured-event-search-0d658d9c/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)