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Japan Evidence Feed Deep Check
x402
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.
Price / call$0.2
Success—
StatusUnknown
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.
Example use cases
Regulatory claim verification for compliance
“Verify the claim 'The Bank of Japan maintained negative interest rates through Q1 2024' using BOJ sources, checking the period from 2024-01-01T00:00:00Z to 2024-03-31T00:00:00Z — I need a supported or contradicted verdict with citations.”
News headline fact-check against METI
“Check whether the claim 'METI announced new semiconductor export controls in late 2023' is supported or contradicted by official METI sources for the window 2023-10-01T00:00:00Z to 2023-12-31T00:00:00Z.”
Due diligence on FSA enforcement action
“I need to verify the claim 'The FSA issued sanctions against multiple crypto exchanges in 2023' — check it against FSA sources for events between 2023-01-01T00:00:00Z and 2023-12-31T00:00:00Z and tell me what evidence you find.”
Technical details
Endpoint
POSThttps://japan-evidence-feed.jp-evidence.workers.dev/api/v1/deep-checkWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| from | string | |
| claim | string | |
| sources | array |
Tags
x402
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