Directory / pennyrail.vercel.app
Search Hacker News stories/comments or fetch front-page results from the public Algolia HN index. Returns titles, URLs, authors, points, comments and timestamps as clean JSON. Exact-match PennyRail gap-arbitrage route.
# 1. Ask the endpoint what it costs (no payment, no wallet needed): curl -i -X POST 'https://pennyrail.vercel.app/api/bazaar/hacker-news' # -> HTTP/1.1 402 Payment Required # the response carries the price, asset and pay-to address. # 2. Pay and retry with any x402 client: npx x402-fetch -X POST 'https://pennyrail.vercel.app/api/bazaar/hacker-news'
Endpoint: https://pennyrail.vercel.app/api/bazaar/hacker-news. Operated by pennyrail.vercel.app, not by Animica. Price and availability were correct at the last probe on 2026-09-02 and are set by the operator, who may change them.
Convert a CSS color between hex, RGB and HSL. Accepts #RRGGBB, rgb(r,g,b), hsl(h,s%,l%) or numeric RGB fields. Exact-match PennyRail gap-arbitrage route.
Generate mean, naive and drift baseline forecasts with simple 95% prediction intervals. Useful as a sanity floor before paying for a more complex forecasting mo…
Extract a value from JSON by dot/bracket path such as items[2].name. Deterministic, no network, returns found/value and normalized path. Exact-match PennyRail g…
Validate a JSON request or response payload against one OpenAPI 3.x / Swagger 2.x operation schema. Supports deterministic JSON-Schema validation rules without …
Extract the useful content from a public URL as clean Markdown for agents. Uses a browser-backed reader when needed and strips navigation/boilerplate. Exact-mat…
Probe a public HTTP endpoint without paying and decode its HTTP 402 payment requirements into clean JSON: status, network, asset, amount, pay-to and challenge m…