Free APIs for Testing

Generate yes or no randomly.

• No API key needed
• Returns JSON at its URL
• HTTPS

Download economic and shipping data using Python.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Generate English Random Words with Pronunciation.

• No API key needed
• Returns JSON at its URL
• HTTPS

Independent Hermès resale index: inventory, market prices, auction calendar and results.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Lineage 2 private servers list with names, websites, chronicles, rates and opening dates.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Find verified legal specialists in Georgia from natural-language queries.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Geologic maps, rock columns and stratigraphy data.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Remote job board for digital nomads.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Beach (sargassum, waves, hurricanes) and ski snow forecasts for 1,900+ resorts, no key.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

French company checks by SIREN: status, insolvency (BODACC), VAT (VIES); free preview.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

On-chain DEX aggregator quotes and route execution data.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

On-chain lottery, draw history, jackpot and advertising endpoints.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Search and purchase prepaid travel eSIM data plans across 190+ countries.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Read-only lookup for published face-shape guide records.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Public biological age competition data with biomarkers and rankings.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Solana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent wallets.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Bank holidays in England and Wales, Scotland and Northern Ireland.

• No API key needed
• Fast: 62 ms response
• Returns JSON at its URL
• HTTPS

Brazilian company profiles by CNPJ, CNAE establishment counts and municipality coordinates.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Corporate, government and ETF Bitcoin, Ethereum and Solana treasury disclosures.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Find geolocation with ip address.

• No API key needed
• Returns JSON at its URL
• HTTPS

Weekly NFL game picks with model win probability, confidence tier and spread.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Random pictures of dogs. A free animals API by random.dog.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Library info on CDNJS. A free development API by cdnjs.com.

• No API key needed
• Returns JSON at its URL
• HTTPS

Brazilian public procurement (PNCP) notices as Markdown with deadlines and requirements.

• No API key needed
• Returns JSON at its URL
• Callable from the browser (CORS)
• HTTPS

Public message board for agent-to-agent messaging, no account or key.

• No API key needed
• Returns JSON at its URL
• HTTPS

Domain name search to find all domains containing particular words/phrases/etc.

• No API key needed
• Returns JSON at its URL
• HTTPS

Unlimited free IP Address API with useful information.

• No API key needed
• Returns JSON at its URL
• HTTPS

Free public leaderboard of x402 paid HTTP services indexed from Coinbase CDP discovery API.

• No API key needed
• Returns JSON at its URL
• HTTPS

Live parcel shipping rates and labels from a plain-words item description.

• No API key needed
• Returns JSON at its URL
• HTTPS

Upcoming chess tournaments from 140+ national federations worldwide.

• No API key needed
• Returns JSON at its URL
• HTTPS

Books, book covers and related data.

• No API key needed
• Returns JSON at its URL
• HTTPS

Brazilian postal codes (CEP) with IBGE coordinates, addresses and the companies registered there.

• No API key needed
• Returns JSON at its URL
• HTTPS

Brazilian companies (CNPJ) lookup and search, with a market check by area and monitoring.

• No API key needed
• Returns JSON at its URL
• HTTPS

Random pictures of foxes. A free animals API by randomfox.ca.

• No API key needed
• Returns JSON at its URL
• HTTPS

Random US, Hong Kong and Cape Verde addresses with matched city, state and ZIP.

• No API key needed
• Callable from the browser (CORS)
• HTTPS

Fake REST API with products, users, posts, comments, todos and more.

• No API key needed
• Callable from the browser (CORS)
• HTTPS

Fake REST API with chaos controls: force any status code, add latency, or a failure rate.

• No API key needed
• Callable from the browser (CORS)
• HTTPS

Hotlinkable CC0 sample files in 78 formats, each with a SHA-256 in a JSON manifest.

• No API key needed
• Callable from the browser (CORS)
• HTTPS

Mock endpoints in 8 formats, each returning any of 14 HTTP status codes.

• No API key needed
• Callable from the browser (CORS)
• HTTPS