API Japan — Japan Data APIs for AI Agents
https://apijapan.vercel.app/api/weather/tokyox402対応の日本データAPI。天気・為替・株価をAIエージェントに提供。APIキー不要・USDC決済。
Paid verification
How it worksNo 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- ✓ Answers a real HTTP 402 challenge
- ✓ Publishes a /.well-known/x402 descriptor
- ✓ Payment address on record
- ✓ Settlement network declared
- ✓ Price declared
x402 readiness
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, 56.3/100), 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 (1619 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 | 32/32 probes succeeded over 30 days (100%). |
| Resource declaration | 10/10 | Declares 25 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. |
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 5% of peers
- This listing 1,619 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.
Paid endpoints
25 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.
https://apijapan.vercel.app/api/weather/tokyo
$0.0010 / call
Tokyo current weather
https://apijapan.vercel.app/api/weather/osaka
$0.0010 / call
Osaka current weather
https://apijapan.vercel.app/api/weather/sapporo
$0.0010 / call
Sapporo current weather
https://apijapan.vercel.app/api/fx/USDJPY
$0.0010 / call
USD/JPY exchange rate
https://apijapan.vercel.app/api/fx/EURJPY
$0.0010 / call
EUR/JPY exchange rate
https://apijapan.vercel.app/api/fx/GBPJPY
$0.0010 / call
GBP/JPY exchange rate
https://apijapan.vercel.app/api/fx/AUDJPY
$0.0010 / call
AUD/JPY exchange rate
https://apijapan.vercel.app/api/news/apac
$0.0050 / call
APAC crypto news
https://apijapan.vercel.app/api/visa/jp
$0.0050 / call
Japan visa requirements (?country=US)
https://apijapan.vercel.app/api/realestate/{city}
$0.0050 / call
Japan land price data by city
https://apijapan.vercel.app/api/tax/jp
$0.0030 / call
Japan consumption tax calculation
https://apijapan.vercel.app/api/population/{prefecture}
$0.0030 / call
Japan prefecture population statistics
https://apijapan.vercel.app/api/logistics/jp
$0.0050 / call
Japan domestic shipping rate estimate
https://apijapan.vercel.app/api/jgb
$0.0020 / call
Japan JGB yield curve
https://apijapan.vercel.app/api/gdp/jp
$0.0030 / call
Japan GDP growth rate
https://apijapan.vercel.app/api/cpi/jp
$0.0020 / call
Japan CPI inflation data
https://apijapan.vercel.app/api/boj/policy
$0.0030 / call
Bank of Japan policy rate
https://apijapan.vercel.app/api/postal/{code}
$0.0010 / call
Japan postal code lookup
https://apijapan.vercel.app/api/elevation/{lat}/{lng}
$0.0010 / call
Japan terrain elevation
https://apijapan.vercel.app/api/address/{lat}/{lng}
$0.0010 / call
Japan reverse geocoder
https://apijapan.vercel.app/api/hazard/{lat}/{lng}
$0.0030 / call
Japan hazard map data
https://apijapan.vercel.app/api/procurement/jp
$0.0030 / call
Japan government procurement notices
https://apijapan.vercel.app/api/resas/{prefecture}
$0.0030 / call
Japan RESAS regional economy data
https://apijapan.vercel.app/api/jshis/{lat}/{lng}
$0.0030 / call
Japan seismic hazard probability
https://apijapan.vercel.app/api/flood/{lat}/{lng}
$0.0030 / call
Japan flood risk data
How to call
curl -sS -i -X GET https://apijapan.vercel.app/api/weather/tokyo # expect HTTP 402 Payment Required (about $0.001/call)Listed in
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