Development – Free-tier APIs
192 Free-tier APIs in the category Development. Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
24 Pull Requests
Project to promote open source collaboration during December
Aether Bridge
Autonomous agent team management and API workflow orchestration
Agent Nexus
Continuously probed registry of APIs, MCP servers and CLIs callable by agents
AgentPay Domain Lookup
DNS records, WHOIS/RDAP, IP ownership and domain reports for AI agents, paid per call via x402
Agify.io
Estimates the age from a first name
Allscreenshots
Website screenshots and PDFs with full-page capture, dark mode and ad blocking
Amazonscraperapi
Amazon product, search & batch scraping API with residential proxies (1000 free)
AmberOne
Turn any website into a build-ready Android, iOS, PWA or Electron app project
AnswerLine
Answers, citations and sources from AI assistants and Google surfaces through one API
API Grátis
Multiples services and public APIs
API Tool Calls
API Tool Calls: Home cost planners, page to Markdown, SEO checks and recalls
ApicAgent
Extract device details from user-agent string
ApiFlash
Chrome based screenshot API for developers
APIs.guru
Wikipedia for Web APIs, OpenAPI/Swagger specs for public APIs
APIzone
Independent uptime & status monitoring for 200+ popular APIs
Aquanode
Live GPU rental prices and availability across nine cloud providers
Azure DevOps
The Azure DevOps basic components of a REST API request/response pair
Beeceptor
Build a mock Rest API endpoint in seconds
Bitbucket
Bitbucket API
Blague.xyz
La plus grande API de Blagues FR/The biggest FR jokes API
Blitapp
Schedule screenshots of web pages and sync them to your cloud
Blynk-Cloud
Control IoT Devices from Blynk IoT Cloud
Bored
Find random activities to fight boredom
BountyCheck
Claimability verdicts for GitHub bounty issues; free stats and sample, checks paid per call via x402
Brainshop.ai
Make A Free A.I Brain
BrewPage
Free hosting for HTML, JSON, key-value, files, multi-file sites with short URLs and TTL retention
Browshot
Easily make screenshots of web pages in any screen size, as any device
CDNJS
Library info on CDNJS
Changelogs.md
Structured changelog metadata from open source projects
ChartBytes
Chart image API: turn a URL into a PNG or SVG chart (bar, line, area, scatter, pie, donut, stacked)
Ciprand
Secure random string generator
Clair
Live public web data as JSON: Google Search, Maps, News, Amazon, jobs, reviews & more, one API key
claudecookie
Convert cookie formats, check Claude sessions and generate Claude Code credentials
Cloudflare
Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec
Cloudflare Trace
Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More
Codeberg
Git hosting, repos and issues via Gitea API
Contentful Images
Used to retrieve and apply transformations to images
CORS Proxy
Get around the dreaded CORS error by using this proxy as a middle man
Crawl Readiness
Check if AI crawlers (ChatGPT, Claude, Perplexity, 30+ others) can access any website
CurlShot
Screenshots, PDFs and scrolling videos of any URL, HTML or Markdown; free tier
Databricks
Service to manage your databricks account,clusters, notebooks, jobs and workspaces
Diagrams.so
Generate editable draw.io architecture diagrams from text or infrastructure code
DigitalOcean Status
Status of all DigitalOcean services
DigMyName
Domain availability and registrar pricing across 52 TLDs
Docker Hub
Interact with Docker Hub
Domain Info by LifeStep
DNS records, SPF/DMARC detection and TLS certificate expiry
DomainDb Info
Domain name search to find all domains containing particular words/phrases/etc
dotsweep
Domain availability across 1200+ TLDs with registration and renewal prices
DownStatus
Real-time status for GitHub, AWS, Discord and 90+ services
EndOfLife.date
Software end-of-life dates and support lifecycles
ExtendsClass JSON Storage
A simple JSON store API
Fair Draw
Verifiable random draws bound to the drand public randomness beacon
Framejet
Website screenshot API with cookie banners and chat widgets removed; free tier
GcrawlAI
Web scraping, SERP API, screenshots, URL to Markdown and prebuilt extractors
GeekFlare
Provide numerous capabilities for important testing and monitoring methods for websites
Genderize.io
Estimates a gender from a first name
GeraCode
Barcode (EAN-13, UPC-A, Code 128, ITF-14) and QR code images, PNG or SVG. Docs in Portuguese
Ghost
Get Published content into your Website, App or other embedded media
GitHub
Make use of GitHub repositories, code and user info programmatically
GithubTrends
GitHub Trending repositories with star history and open-source alternatives to paid tools
Gitlab
Automate GitLab interaction programmatically
Go Module Proxy
Go module versions and source metadata
Google Docs
API to read, write, and format Google Docs documents
Google Firebase
Google's mobile application development platform that helps build, improve, and grow app
Google Fonts
Metadata for all families served by Google Fonts
Google Keep
API to read, write, and format Google Keep notes
Google PageSpeed Insights
Website performance and Lighthouse audit scores
Google Sheets
API to read, write, and format Google Sheets data
Google Slides
API to read, write, and format Google Slides presentations
Hasura
GraphQL and REST API Engine with built in Authorization
Heroku
REST API to programmatically create apps, provision add-ons and perform other task on Heroku
Hex
Elixir and Erlang package versions and docs
Hipsum
Hipster-themed lorem ipsum generator for placeholder text
Homebrew Formulae
Package and cask data for the Homebrew package manager
host-t.com
Basic DNS query via HTTP GET request
Host.io
Domains Data API for Developers
HostDealRadar
Source-backed hosting price and provider record lookup
HTTP2.Pro
Test endpoints for client and server HTTP/2 protocol support
Httpbin
A Simple HTTP Request & Response Service
Hunter
API for domain search, professional email finder, author finder and email verifier
IBM Text to Speech
Convert text to speech
Icanhazepoch
Get Epoch time
Icanhazip
IP Address API
IFTTT
IFTTT Connect API
Image-Charts
Generate charts, QR codes and graph images
Index Agentica
Agent-first directory of skills, MCP servers, tools, protocols and APIs as JSON, markdown, llms.txt
ip-fast.com
IP address, country and city
IP2WHOIS Information Lookup
WHOIS domain name lookup
ipfind.io
Geographic location of an IP address or any domain name along with some other useful information
IPify
A simple IP Address API
IPinfo
Another simple IP Address API
Ironfang Render
Screenshots, PDFs, dynamic images, QR codes and video from URLs or HTML
Is This Site Down?
Check if any website is down, from two continents; live status, uptime history and TLS expiry
isitdownstatus
Check if websites and online services are currently down
jsDelivr
Package info and download stats on jsDelivr CDN
JSON 2 JSONP
Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript
JSONbin.io
Free JSON storage service. Ideal for small scale Web apps, Websites and Mobile apps
JSONPlaceholder
Fake REST API for testing and prototyping
jstash
Save JSON with one request and get a URL; private JSON for each signed-in user of your app
Keyvalue
Simple key-value storage REST API for quick prototyping