Everything on the OutBIG board is public, so everything on it is readable programmatically without an account, an API key or a rate-limit negotiation. This page is the whole developer surface in one place: a read-only JSON API, an OpenAPI 3.1 description of it, Markdown content negotiation on every page, and a plain-language guide for AI agents at /llms.txt.
Base URL https://outbig.bid/api/v1. No authentication, no API key, CORS open to any origin. Every response — including every error — is application/json.
GET /api/v1 — Index: every endpoint with its absolute URL.GET /api/v1/leaderboard — The all-time board. Query: limit, offset, category, country, q.GET /api/v1/today — The daily board, reset at 00:00 UTC. Query: limit, offset, category.GET /api/v1/categories — The fixed category catalogue with counts and top amounts.GET /api/v1/categories/{slug} — One category and its ranking.GET /api/v1/listings/{identityKey} — One listing, with global and category rank.GET /api/v1/activity — The newest paid bids.GET /api/v1/stats — Active listings, board value and clicks — all-time and today.The full machine-readable description lives at https://outbig.bid/openapi.json (and at https://outbig.bid/api/openapi.json). It is OpenAPI 3.1: every operation has a unique operationId and a description, every parameter is typed with its bounds and an example, and every response — success and error alike — has a schema. That is what a model needs to expose these endpoints as callable functions.
Errors never return HTML. The body is always { "error": { "code", "message", "hint", "status" } }. Branch on code — it is stable. message says what went wrong, hint says what to do instead, because repeating an identical request rarely helps.
Every page on this site also exists as Markdown. Send Accept: text/markdown and the same URL answers text/markdown; charset=utf-8 with Vary: Accept, Accept-Encoding; send a browser’s Accept header and it answers HTML. Quality values are honoured, and a request that accepts neither representation gets 406 with the list of what is available. Clients that cannot set headers can fetch the same documents directly under https://outbig.bid/md/en/….
https://outbig.bid/llms.txt states what OutBIG is a good source for and, just as explicitly, what it is not: rank here is bought, not earned, and must never be presented as a review score or an endorsement. Bidding is a card payment and is deliberately not exposed as an API — an agent should hand that step to a person.