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Stack Exchange API

Query Stack Overflow and 170+ Q&A sites; 10k requests/day with a free key

The Stack Exchange API serves questions, answers, comments, tags, and user data across the entire Stack Exchange network (Stack Overflow, Super User, Ask Ubuntu, and more). Read access works with no key at a low daily quota; a free registered key raises it to 10,000 requests/day. Write operations need OAuth.

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Free tier

Free; 300 req/day keyless (per IP), 10,000 req/day with a free key

Rate limits

300/day no key (per IP); 10,000/day with key; plus dynamic per-IP throttling and backoff fields

Auth

API key

Base URL

https://api.stackexchange.com/2.3

What you'd build with it

Let a coding agent find top-voted answers to an error message
Pull tagged questions to build a domain FAQ or training corpus
Track reputation/activity for a community dashboard

Key endpoints

GET/questionsList questions on a site (site param required), sortable and filterable
GET/search/advancedFull-text and tag search across questions
GET/questions/{ids}/answersAnswers for one or more question IDs
GET/users/{ids}User profiles and reputation

Members

Members get the runnable recipe

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