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Hugen Tokyo x402 API Discovery Search
x402
Hugen Tokyo x402 API Discovery Search is a paid API for AI agents from discovery.hugen.tokyo, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Search a catalog of 2,400 quality-scored x402 pay-per-call APIs across 24 categories, returning relevance-ranked results with pricing, network, and brokerable metadata
Price / call$0.005
Success—
StatusUnknown
How this service works
Find x402 pay-per-call APIs — 2,400 verified entries across 24 categories (DeFi, Weather, AI/LLM, Security, Finance/FX, Content, Domain, Visual, Intelligence, etc). Quality-scored, relevance-ranked with brokerable flag. No setup needed. Accepts USDC payments on Base and Solana
Output
A JSON array of up to `limit` API entries, each with: url, price, network (e.g. Base or Solana), category, brokerable boolean, description, lastUpdated timestamp, and quality_score. Results are ranked by relevance to the query.
Example use cases
Find weather data APIs with crypto payments
“Search for pay-per-call weather and climate APIs in the x402 catalog that accept USDC on Solana. I need reliable quality scores and current pricing.”
Discover DeFi APIs my agent can call
“Look up what DeFi and financial protocol APIs are available in the x402 ecosystem that I can pay per call with USDC. Show me the most relevant ones with their networks and quality ratings.”
Locate brokerable content generation APIs
“Find all content creation and image generation APIs in the x402 catalog marked as brokerable, especially ones available on Base. Give me the top results sorted by quality score.”
Technical details
Endpoint
GEThttps://discovery.hugen.tokyo/discovery/searchWhen to prefer
Use this endpoint when an AI agent needs to discover which x402 pay-per-call APIs exist for a given capability or domain, especially when the agent needs to find APIs that accept USDC on Base or Solana and has no prior knowledge of available endpoints. Prefer this over general web search when you need structured, quality-scored, machine-readable API metadata.
Side effects
- Empty results if query term matches no registered APIs
- Missing or malformed `q` parameter returns error
- Category filter typo returns empty set
- Rate limit or payment failure returns 402 or 429
- Stale entries if an API was deregistered after lastUpdated
Input
{
"q": "weather",
"limit": 10,
"category": "Weather"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| q | string | Search keywords (e.g. 'weather forecast', 'defi token security'). Empty = browse recent APIs across categories. |
| limit | integer | Max results (1-20) |
| category | string | Category filter (e.g. 'DeFi', 'Weather', 'AI/LLM') |
Output
{
"query": "weather",
"results": [
{
"url": "https://weather.hugen.tokyo/weather/current",
"price": "$0.01",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://weather.hugen.tokyo/weather/current\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://weather.hugen.tokyo/weather/current\")",
"brokerable": true,
"description": "Current weather for any city or coordinates — temperature, humidity, wind, precipitation. Global coverage updated every 15 min. No API keys needed.",
"lastUpdated": "2026-05-02T00:41:18.568Z",
"quality_score": 0.92
},
{
"url": "https://orbisapi.com/proxy/weather-api-b83454/format",
"price": "$0.005",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/weather-api-b83454/format\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/weather-api-b83454/format\")",
"brokerable": true,
"description": "Current weather, 5-day forecast, and air quality via OpenWeatherMap free tier.",
"lastUpdated": "2026-05-01T12:43:59.624Z",
"quality_score": 0.62
},
{
"url": "https://x402payswap.vercel.app/api/weather",
"price": "free",
"network": "Base",
"category": "Weather",
"brokerable": false,
"description": "Live weather — Real-time weather (temperature, wind, humidity) from Open-Meteo for any city worldwide.",
"lastUpdated": "2026-04-28T23:54:21.515Z",
"quality_score": 0.61
},
{
"url": "https://orbisapi.com/proxy/weather-api-b83454",
"price": "$0.001",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/weather-api-b83454\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/weather-api-b83454\")",
"brokerable": true,
"description": "Current weather, 5-day forecast, and air quality via OpenWeatherMap free tier.",
"lastUpdated": "2026-04-26T14:12:43.498Z",
"quality_score": 0.61
},
{
"url": "https://orbisapi.com/proxy/weather-alerts-api-1c9f02/bulk",
"price": "$0.005",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/weather-alerts-api-1c9f02/bulk\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/weather-alerts-api-1c9f02/bulk\")",
"brokerable": true,
"description": "Get active weather alerts by US state, location, or NWS zone plus 7-day forecasts.",
"lastUpdated": "2026-05-02T13:34:34.935Z",
"quality_score": 0.62
},
{
"url": "https://orbisapi.com/proxy/weather-insurance-trigger-api-ceaef4/.well-known/x402.json%20-%20Return%20x402%20payment%20discovery%20metadata%20as%20JSON",
"price": "$0.005",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/weather-insurance-trigger-api-ceaef4/.well-known/x402.json%20-%20Return%20x402%20payment%20discovery%20metadata%20as%20JSON\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/weather-insurance-trigger-api-ceaef4/.well-known/x402.json%20-%20Return%20x402%20payment%20discovery%20metadata%20as%20JSON\")",
"brokerable": true,
"description": "Evaluate parametric weather insurance triggers from rainfall, wind, heat, freeze, and policy thresholds",
"lastUpdated": "2026-05-02T13:10:33.929Z",
"quality_score": 0.62
},
{
"url": "https://orbisapi.com/proxy/historical-weather-api-578961/parse",
"price": "$0.005",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/historical-weather-api-578961/parse\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/historical-weather-api-578961/parse\")",
"brokerable": true,
"description": "Historical weather data since 1940 — temperature, precipitation, wind for any location.",
"lastUpdated": "2026-05-02T13:08:47.628Z",
"quality_score": 0.62
},
{
"url": "https://orbisapi.com/proxy/historical-weather-api-578961/info",
"price": "$0.005",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/historical-weather-api-578961/info\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/historical-weather-api-578961/info\")",
"brokerable": true,
"description": "Historical weather data since 1940 — temperature, precipitation, wind for any location.",
"lastUpdated": "2026-05-02T13:08:14.278Z",
"quality_score": 0.62
},
{
"url": "https://orbisapi.com/proxy/weather-forecast-api-770849/openapi",
"price": "$0.004",
"network": "Base",
"category": "Weather",
"call_hint": "Broker: POST /broker/call with {\"url\": \"https://orbisapi.com/proxy/weather-forecast-api-770849/openapi\", \"method\": \"GET\"} | SDK: x402_pay.get(\"https://orbisapi.com/proxy/weather-forecast-api-770849/openapi\")",
"brokerable": true,
"description": "Fetch 7-day daily or hourly weather forecast for any location.",
"lastUpdated": "2026-05-02T13:08:12.627Z",
"quality_score": 0.62
},
{
"url": "https://api.strale.io/x402/weather-lookup",
"price": "free",
"network": "Base",
"category": "Weather",
"brokerable": false,
"description": "Get current weather and 7-day forecast for any location. Uses Open-Meteo API. Search by city name or coordinates. SQS: 98/100.",
"lastUpdated": "2026-05-01T17:55:33.093Z",
"quality_score": 0.62
}
],
"call_via": {
"key": "POST https://discovery.hugen.tokyo/keys/create for free key ($0.05 — covers 10 searches or 5 broker calls). POST /keys/topup for $1.00 more.",
"sdk": "pip install x402-pay; import x402_pay; r = x402_pay.get('<result_url>')",
"broker": "POST https://discovery.hugen.tokyo/broker/call with X-API-Key header and {\"url\": \"<result_url>\", \"method\": \"GET\"} body. One key calls any brokerable API."
},
"total_results": 308,
"category_filter": "Weather"
}Schema · Response
| Field | Type | Description |
|---|---|---|
| queryrequired | string | |
| resultsrequired | array | |
| call_viarequired | object | |
| total_resultsrequired | number | |
| category_filterrequired | string |
Tags
x402
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