# Japan Evidence Feed - Event Evidence Pack

> Japan Evidence Feed - Event Evidence Pack is a paid API for AI agents from japan-evidence-feed.jp-evidence.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Retrieves a structured evidence pack for a specific Japanese regulatory event, including source-passage excerpts with locators, snapshot hash, timestamps, and freshness/provenance verification status.

## Facts

- Endpoint: GET https://japan-evidence-feed.jp-evidence.workers.dev/api/v1/evidence/:eventId
- Price: $0.05/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-event-evidence-pack-bb26f463
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UOWQUroBlBwiGvbUAUILA

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-event-evidence-pack-bb26f463
```

Example prompt: Fetch the full evidence pack for event ID fsa-20240315-a3f2b1c0 — I need the source excerpts with locators, the sha256 snapshot hash, and whether the data is still fresh or stale.

## When to prefer this

Use this endpoint when you already have a specific event ID (from a prior search or detection step) and need the full provenance-backed evidence pack — source excerpts, snapshot hash, timestamps, and freshness verification — for a single Japanese regulatory event from FSA, BOJ, or METI. Prefer this over the search endpoint when you want to audit or cite a specific known event rather than discover new ones.

## Known failure modes

- Invalid or malformed eventId pattern returns a 400 or 404 error
- Event ID does not exist in the system returns a not-found response
- Snapshot hash mismatch may indicate stale or tampered content flagged in verification status
- Freshness field returns 'stale' if the underlying source document has been superseded
- Payment failure (x402) if USDC funds are insufficient or payment header is malformed

## How this service works

Evidence Pack for one event: source-passage excerpts with locators, the retrieval timestamp, sha256 snapshot hash, and a freshness/provenance verification status.

## Output

A structured evidence pack containing: bilingual titles and summaries (Japanese and English), an array of source-passage excerpts each with a locator string, the original source URL, sha256 snapshot hash, retrieval timestamp, publication timestamp, detection timestamp, freshness status (current or stale), provenance verification status, a list of detected changes, and the originating source agency (FSA, BOJ, or METI).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "eventId"
     ],
     "properties": {
      "eventId": {
       "type": "string"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "eventId",
      "source",
      "sourceUrl",
      "snapshotHash",
      "retrievedAt",
      "publishedAt",
      "detectedAt",
      "freshness",
      "verification",
      "titleJa",
      "titleEn",
      "summaryJa",
      "summaryEn",
      "excerpts",
      "changes"
     ],
     "properties": {
      "source": {
       "enum": [
        "FSA",
        "BOJ",
        "METI"
       ],
       "type": "string"
      },
      "changes": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "eventId": {
       "type": "string",
       "pattern": "^(fsa|boj|meti)-\\d{8}-[a-f0-9]{8}$"
      },
      "titleEn": {
       "type": "string",
       "minLength": 1
      },
      "titleJa": {
       "type": "string",
       "minLength": 1
      },
      "excerpts": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "text",
         "locator"
        ],
        "properties": {
         "text": {
          "type": "string",
          "maxLength": 1000
         },
         "locator": {
          "type": "string"
         }
        },
        "additionalProperties": false
       }
      },
      "freshness": {
       "enum": [
        "current",
        "stale"
       ],
       "type": "string"
      },
      "sourceUrl": {
       "type": "string",
       "format": "uri",
       "pattern": "^https:\\/\\/.*"
      },
      "summaryEn": {
       "type": "string",
       "minLength": 1
      },
      "summaryJa": {
       "type": "string",
       "minLength": 1
      },
      "
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-evidence-feed-event-evidence-pack-bb26f463/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)