AI & model APIsactive
OpenAI API
A model platform for text, multimodal input, structured outputs, tools, embeddings, image, audio, and agent-oriented workflows.
- Auth
- Bearer API key in the Authorization header
- Verified
Source-backed API intelligenceFind the API.
Find the API.
Verify the facts.
API Atlas turns fragmented vendor documentation into concise, dated, source-visible profiles. No scraped doc dumps. No mystery claims.
- Verified providers
- 36
- Categories
- 8
- Task guides
- 23
Start here
Field notes, not brochures.
Every profile links mutable claims to current official sources and shows when the claim was checked.
Market dataactive
EODHD
A broad financial-data API covering end-of-day prices, fundamentals, corporate actions, intraday data, news, and more.
- Auth
- API token in the api_token query parameter
- Verified
Public dataactive
BOK ECOS
The Bank of Korea's official economic-statistics API for Korean monetary, financial, price, national-account, and related time series.
- Auth
- ECOS API key embedded in the request path
- Verified
Market dataactive
Massive
A market-data platform for stocks, options, futures, indices, forex, crypto, economic, and alternative datasets.
- Auth
- Bearer API key or apiKey query parameter
- Verified
AI & model APIsactive
Gemini API
Google's developer API for Gemini models, multimodal generation, embeddings, files, tools, and live interactions.
- Auth
- Gemini API key in x-goog-api-key; current documentation distinguishes authorization keys from standard keys
- Verified
Market dataactive
yfinance
An open-source Python library that retrieves market data through Yahoo Finance's publicly available interfaces.
- Auth
- No user-managed API key for the normal package interface
- Verified
Browse by problem
Explore by problem.
Categories are deliberately broad in the MVP. The provider page holds the nuance.
04 providers
AI & model APIs
Model APIs for text, multimodal input, tools, structured output, and agent workflows.
10 providersMarket data
Market prices, reference data, corporate actions, fundamentals, and developer libraries.
08 providersPublic data
Government and central-bank datasets published through official open APIs.
01 providersCurrency data
Current and historical foreign-exchange rates and currency conversion services.
06 providersDeveloper platforms
Source control, edge infrastructure, databases, and backend platform APIs.
02 providersPayments
APIs for payments, billing, subscriptions, and merchant operations.
03 providersCommunications
Messaging, collaboration, content, and notification APIs.
02 providersMaps & weather
Geospatial services, maps, geocoding, forecasts, and environmental data.
Integration playbooks
All guides →Build with fewer surprises.
Guide 01
How to choose a stock market data API
Turn a vague data wish list into a tested decision on coverage, adjustments, latency, rights, and total operating cost.
Guide 02How to choose an LLM API
Select a model platform with a reproducible evaluation instead of chasing a leaderboard or a single token price.
Guide 03How to handle API keys safely
Keep credentials out of source, clients, logs, and accidental blast radii with a practical key lifecycle.
Guide 04How to implement REST pagination
Build one resilient iterator across page numbers, offsets, cursors, and next-link APIs without losing or duplicating records.