Japan Data API — agent-tools.cloud

Agent-first Japanese public data API. Paid endpoints return HTTP 402 and accept x402 payments.

Paid verification

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B 59.0 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 402)

Payability 15.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 0.0 / 35

0 distinct payers, 0 USDC transfers in the last 30 days

Performance 10.0 / 10

Last probe answered in 191 ms (full marks at 200 ms or less)

Readiness 14.0 / 15

Agent readiness 93/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 20 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

A · 93/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B, 59.0/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	25/25	Paid endpoint answers with an HTTP 402 challenge (191 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	5/5 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 15 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (191 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, catalog_listing. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness: Higher than 94% of peers; This listing 93 · peer median 78
Latency: Faster than 54% of peers; This listing 191 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Paid endpoints

15 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

GET https://japan-data-api-x402.fly.dev/v1/companies/search

Search companies by name, prefecture, or corporate number.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number

Get basic registry information and change history for a corporate number.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number/financials

Get a normalized financial summary from EDINET disclosures.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number/sanctions

Get administrative sanctions and warnings linked to a corporate number.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number/risk-profile

One call bundle: registry, financials, sanctions, matching subsidies, tenders, awards, and a heuristic risk score.

POST https://japan-data-api-x402.fly.dev/v1/companies/risk-profile/batch

Screen up to 10 companies in one call. Returns a risk profile per corporate number, plus a not_found list.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number/subsidy-matches

Return open subsidies that target the company's prefecture, with the company's basic profile.

GET https://japan-data-api-x402.fly.dev/v1/companies/:corporate_number/tender-opportunities

Return open public tenders in the company's prefecture, ordered by bid deadline where available.

GET https://japan-data-api-x402.fly.dev/v1/sanctions/search

Search curated administrative sanctions by keyword, authority, corporate number, and date range.

GET https://japan-data-api-x402.fly.dev/v1/subsidies/search

Search subsidies by keyword, region, industry, purpose, and open status.

GET https://japan-data-api-x402.fly.dev/v1/subsidies/:id

Get subsidy details, eligibility, amount, and official URL.

GET https://japan-data-api-x402.fly.dev/v1/procurements/search

Search open tenders from national and local governments.

GET https://japan-data-api-x402.fly.dev/v1/procurements/awards

Search national government contract awards by keyword or corporate number.

GET https://japan-data-api-x402.fly.dev/v1/laws/search

Search laws and regulations via e-Gov, with an optional as-of date.

GET https://japan-data-api-x402.fly.dev/v1/laws/:law_id

Get a law's structured text, articles, and revision metadata.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://japan-data-api-x402.fly.dev/v1/companies/%7Bcorporate_number%7D  # expect HTTP 402 Payment Required (about $0.02/call)

/.well-known/x402.json

https://japan-data-api-x402.fly.dev/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-11-08