Micro Data API Factory
Public-source structured data APIs for AI agents. x402 micropayments.
Live: https://micro-data-api-factory.kasanegi123.workers.dev
Datasets
| Dataset | Items | Description |
|---|---|---|
| Japanese Food Composition | 2,538 | MEXT official nutrition data — 18 food groups, 100g basis |
| SPDX License List | 727 | Complete OSS license catalog with OSI/FSF status |
| HTTP Headers (IANA) | 41 | IANA HTTP header registry with AI annotations |
| AI Crawler UA DB | 15 | AI crawler User-Agent strings |
| x402 Ecosystem DB | 12 | x402 / Pay Per Crawl ecosystem |
| Public Data Candidates | 10 | Evaluated public data sources |
API
# List all datasets
curl https://micro-data-api-factory.kasanegi123.workers.dev/api/v1/datasets
# Dataset statistics
curl https://micro-data-api-factory.kasanegi123.workers.dev/api/v1/datasets/jp-food-composition/stats
# Search items
curl "https://micro-data-api-factory.kasanegi123.workers.dev/api/v1/datasets/jp-food-composition/items?q=鶏肉"
# Item detail
curl https://micro-data-api-factory.kasanegi123.workers.dev/api/v1/datasets/jp-food-composition/items/11001
# Ranking
curl https://micro-data-api-factory.kasanegi123.workers.dev/api/v1/datasets/jp-food-composition/ranking?limit=10
Free for humans. AI crawlers get free basic access; premium endpoints (sources, export) return HTTP 402 with x402 payment instructions.
Currently in stub mode — 402 responses are returned but real payments are not yet processed.
Weather Data API (pay-per-call) — Updated 2026-04-20
Global weather data for AI agents. Pass a city name or coordinates, get structured JSON. No API keys, no geocoding setup. Backed by Open-Meteo (CC BY 4.0).
Runs on a dedicated worker (weather-data-api.kasanegi123.workers.dev) with a narrow x402 surface — only weather endpoints plus minimal discovery files. Full x402 v2 payment-required envelope including extensions.bazaar input/output schemas (so strict validators mark the resources callable automatically).
| Endpoint | Price | Description |
|---|---|---|
| GET /weather/current?city=Tokyo | $0.001 USDC | Current conditions — temperature, feels-like, humidity, wind, precipitation, condition |
| GET /weather/forecast?city=Tokyo&days=3 | $0.001 USDC | Daily forecast (1–7 days) — high/low, precipitation probability, wind max |
- Network: Base mainnet (
eip155:8453) - Asset: USDC (
0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) - Facilitator: Coinbase CDP
- Real x402 settlement — no stub mode for this endpoint; payments land on-chain
- Discovery: /.well-known/x402 · /openapi.json · /llms.txt
- Registry: x402scan server page
Attribution: Weather data by Open-Meteo.com (CC BY 4.0).
AI Discovery
| File | URL |
|---|---|
| LLM summary | /llms.txt |
| Full LLM docs | /llms-full.txt |
| OpenAPI 3.1.0 | /openapi.json |
| x402 manifest | /.well-known/x402 |
| Agent capabilities | /.well-known/agentic-capabilities.json |
| Dataset index | /datasets-index.json |
| Sitemap | /sitemap.xml |
Each dataset has a Markdown page at /datasets/{id}.md for AI consumption.
Transparency
AI Crawler Dashboard — who's crawling, who's paying.
curl https://micro-data-api-factory.kasanegi123.workers.dev/api/public/crawl-summary
What is this?
A factory that converts scattered public information into small, structured data APIs that AI crawlers can read and pay for via x402.
Each record includes source_url, checked_at, extraction_method, quality_level, confidence, and warnings. Accuracy is not guaranteed — this is source-linked observational data.
Tech
- Cloudflare Workers + Hono + D1
- x402 protocol (USDC on Solana, stub mode)
Related
- AI Food Data API — Food composition data API
- AI Laws Data API — Japanese law text API
Hokkaido Defunct Railway Archive — Updated 2026-04-18
Archival reference for 40 defunct Hokkaido rail lines (1950–2026). 1,806 stations · 1,026 timetable revisions · 30,326 station×revision appearances · 61 monthly cover PDFs. Cover PDFs are paid assets at $0.01 each via x402 (USDC on Base mainnet).
Primary site (recommended entry point for AI crawlers): → retro-rail-archive-v14.kasanegi123.workers.dev
Deep links (v14):
- /api/flyers — index of all 61 cover PDFs
- /active-stations — current residents + full cover PDF archive grid
- /api/lines · /lines/haboro · /lines/tempoku · /lines/nayoro · /lines/chihoku
- /api/revisions · /api/appearances · /api/stats/summary
- /llms.txt · /.well-known/x402 · /sitemap-pages.xml
Sample cover PDFs (each $0.01 via x402):
Line examples: 羽幌線 · 美幸線 · 標津線 · 天北線 · 名寄本線 · 湧網線 · 白糠線 · 士幌線 · 広尾線 · 胆振線 · 深名線 · 池北線 · 夕張線 · 札沼線 · 日高本線 · 留萌本線 (40 lines total).
PDF asset format variants (A1–A4)
The same archive is served via four cover-PDF rendering formats, one per sibling site. All share the v14 paywall configuration (UA-filtered, /active-stations + /api/stats* + /api/stations/ranking* + /flyers/*.pdf paid for AI crawlers).
- A1 grid — station × train-number timetable grid (3 pages) — v14 sample
- A2 route-map — vertical route map with station dots and km labels (3 pages) — v01 sample
- A3 poster — monthly poster/flyer with heavy title blocks and revision stamp (2 pages) — v02 sample
- A4 bulletin — archival bulletin with change summary + history timeline + station digest (4 pages) — v03 sample
Configuration variants under test (secondary)
Alternate paywall configurations for comparison. All serve the same archive dataset; only paywall scope differs.
v01 v02 v03 v04 v05 v06 v07 v08 v09
Extended archive cohort (N1–N8) — consecutive recent monthly coverage
Sibling sites covering the same lines with a consecutive 61-month recent coverage window (ending 2025-12 for the Hokkaido-region archive, 2023-12 for Honshu, 2019-12 for European, 2014-12 for US). Filename pattern is {region}-flyer-YYYY-MM.pdf for brevity. All serve free HTML and JSON; paid cover PDFs at $0.01 via x402 (the N8 site tests $0.001).
- N1 Hokkaido (Extended, grid PDF) — v10 · sample
- N2 Hokkaido (Extended, route-map PDF) — v11 · sample
- N3 Honshu (Extended) — v12 · sample
- N4 European (Extended) — v13 · sample
- N5 US (Extended) — v15 · sample
- N6 Hokkaido (Extended, stats-gate paywall) — v16
- N7 Hokkaido (Extended, minimal paywall) — v17
- N8 Hokkaido (Extended,
$0.001price test) — v18 · manifest
Each extended site includes an enhanced homepage (About / AI & LLM Friendly / API Endpoints / Developers / Usage sections), a pure-English llms.txt, and /api/flyers listing 61 consecutive monthly covers.
Inspired by
Berghain Klubnacht Database by jphfa — the first known site to receive x402 payments from AI crawlers.
License
MIT (this README and public API documentation)