Best Free APIs for Developers
Curated collection of 150+ high-reliability, zero-cost public REST APIs across 47 industries, complete with ready-to-use cURL, JS, and Python code snippets.
Overview & Comparison Matrix
389 Endpoints| API Name | Category | Auth Status | Rate Limit | Action |
|---|---|---|---|---|
| Geekflare API | developer | Free Key | 500 req/month (Free Tier) | View API |
| Trimwise API | ai-llm | No Key | 150 req/min (No Auth) | View API |
| Pixepi API | developer | No Key | 10 req/day (Member) • 3 req/day (Guest) | View API |
| ReadGZH | developer | No Key | 30 credits/day (Registered) • 10 req/day (Guest) | View API |
| SiftingIO | finance | Free Key | 10,000 req/month (Free Tier) | View API |
| 10ML Fragrance Index API | ecommerce | No Key | Unlimited (No-Key & Open CORS) | View API |
| SoldFetch | ecommerce | Free Key | 100 units/month (Free Tier) | View API |
| XCrawl Web Data API | developer | Free Key | 1,000 Free Credits | View API |
| CurlShot | developer | Free Key | 100 screenshots/month (10 req/min) | View API |
| Arcmira: YouTube Transcript Search | video | Free Key | Freemium (Free Plan + Paid Usage) | View API |
All Verified Endpoints(24 / 389)
Geekflare API
All-in-one developer API providing web scraping, full-page screenshots, Google SERP data, and DNS/SSL diagnostics
Trimwise API
Query-aware context and token compression engine for LLMs. Fits long documents into prompt token budgets by extracting relevant excerpts
Pixepi API
Developer platform offering PDF merge, split, compress, and image conversion/resizing tools through a single versioned REST API (v1). Includes free guest and registered member tiers.
ReadGZH
Converts public WeChat articles into clean Markdown for AI assistants, LLM pipelines, and research workflows. Features anonymous zero-card access, daily free credits, and a hosted MCP server.
SiftingIO
Real-time and historical market data for US stocks, forex, crypto and commodities via REST and WebSocket. 25+ years of OHLCV history, watchlists and portfolio analytics.
10ML Fragrance Index API
Public REST JSON and MCP service for 5,400+ perfumes, notes, fragrance pyramids, accords, and seasonal profiles. Zero auth, open CORS, and no signup required.
SoldFetch
Search eBay sold and active listings, browse categories, and retrieve item details through REST or MCP for resale and market research.
XCrawl Web Data API
Web data API for AI builders: scrape, crawl, map domains, and extract clean JSON or Markdown with proxy and headless rendering.
CurlShot
Screenshot API converting URL, HTML, or Markdown into PNG, JPEG, WebP, PDF, or scrolling videos with full page and dark mode support.
Arcmira: YouTube Transcript Search
Search indexed YouTube and podcast transcripts for timestamped quotes, speaker appearances, mentions, and recommendations via REST or MCP.
IPKit
High-speed free IP lookup API returning geolocation, ASN/ISP, and VPN/Proxy/Tor detection signals. HTTPS, zero-auth, and open CORS.
StatOrigin
Open index of industry statistics from primary publishers across 32 industries, linking figures directly to source reports.
CPFHub.io
REST API for Brazilian CPF data verification, name matching, and birth date validation with batch processing and MCP support.
thirds.ai
Create branded PDFs and images from HTML or saved templates via a versioned REST API. Starts free with 50 monthly credits.
Open-Meteo
Zero registration required, 16-day forecasts, free for non-commercial applications
OpenWeatherMap
7-day weather forecast, current conditions, and historical records
AirVisual
Global real-time air quality index (AQI) and pollution sensor datasets
OpenAQ
Global community air quality open environmental data platform
HookEcho
Real-time weather radar without the clutter, providing live precipitation vectors, lightning activity telemetry, storm warnings, and historical meteorological data.
Petrichor
Open-source meteorological tool calculating FAO-style soil water balance and precipitation forecasts from Open-Meteo to optimize watering schedules.
US Grow Zones
Zero-auth public REST API providing 2023 USDA plant hardiness zones, 2012 historical climate comparison, and NOAA frost dates across 40,502 US ZIP codes.
CoinGecko
Zero authentication required, comprehensive crypto market datasets
Frequently Asked Questions & Developer Guide
Are these APIs completely free for developers?
Yes, all endpoints included in this collection offer free tiers, zero-cost quotas, or open public data licenses without requiring paid subscriptions.
Which APIs do not require an API key?
Endpoints such as Open-Meteo, CoinPaprika, World Cities, and PokéAPI operate with Zero-Auth and can be invoked directly from code.
Can I use these in production or commercial apps?
Most providers permit commercial usage within fair-use quotas. Please review the official documentation link for specific SLA terms.
How do I bypass CORS restrictions?
Use FreeAPI Smart Edge Gateway to bypass browser CORS headers and inspect live responses with sub-2ms caching.