Best Development APIs in 2026

The top 15 of 215 free Development APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. Icanhazip API takes the top spot.

Last tested Oct 24, 2026 · Rankings update daily

1
Icanhazip API
Online · 278 ms
The family of icanhaz sites help you get more information about your network connection.
- No API key needed
- Fast: 278 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
Index Agentica API
Online · 382 ms
Agent-first directory of skills, MCP servers, tools, protocols and APIs as JSON, markdown, llms.txt.
- No API key needed
- Fast: 382 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
Open VSX API
Online · 270 ms
Search and access VS Code extensions from the Open VSX registry.
- No API key needed
- Fast: 270 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
RubyGems API
Online · 360 ms
Ruby gem metadata, versions, dependencies and search.
- No API key needed
- Fast: 360 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
5
Statically API
Online · 324 ms
A free CDN for developers.
- No API key needed
- Fast: 324 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
6
TidyTools API
Online · 157 ms
Web page to clean Markdown and AI crawler robots.txt checks, free without a key (rate limited).
- No API key needed
- Fast: 157 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
7
24 Pull Requests API
Online · 852 ms
Project to promote open source collaboration during December.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
8
ApicAgent API
Online · 1108 ms
Extract device details from user-agent string.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
9
APIzone API
Online · 513 ms
Independent uptime & status monitoring for 200+ popular APIs.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
10
Cloudflare Trace API
Online · 785 ms
Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
11
CORS Proxy API
Online · 1056 ms
Get around the dreaded CORS error by using this proxy as a middle man.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
12
crates.io API
Online · 963 ms
Rust crate versions, downloads and dependency metadata.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
13
DigMyName API
Online · 656 ms
Domain availability and registrar pricing across 52 TLDs.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
14
EndOfLife.date API
Online · 783 ms
Software end-of-life dates and support lifecycles.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
15
Fair Draw API
Online · 576 ms
Verifiable random draws bound to the drand public randomness beacon.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS

Development APIs compared

Top Development APIs compared
API	API key	HTTPS	CORS	Uptime	Response	Rating
Icanhazip	No	Yes	Yes	Up	278 ms	Not rated
Index Agentica	No	Yes	Yes	Up	382 ms	Not rated
Open VSX	No	Yes	Yes	Up	270 ms	Not rated
RubyGems	No	Yes	Yes	Up	360 ms	Not rated
Statically	No	Yes	Yes	Up	324 ms	Not rated
TidyTools	No	Yes	Yes	Up	157 ms	Not rated
24 Pull Requests	No	Yes	Yes	Up	852 ms	Not rated
ApicAgent	No	Yes	Yes	Up	1108 ms	Not rated
APIzone	No	Yes	Yes	Up	513 ms	Not rated
Cloudflare Trace	No	Yes	Yes	Up	785 ms	Not rated

More Development APIs

Best Development API FAQ

What is the best free Development API in 2026?

Based on access, reliability and developer ratings, the top free Development APIs right now are Icanhazip API, Index Agentica API and Open VSX API. Icanhazip API ranks first. Rankings update daily from health checks of all 215 Development APIs in the directory.

What is the best Development API without an API key?

Icanhazip API, Index Agentica API and Open VSX API need no API key, so you can call them without signing up. 105 of the 215 ranked Development APIs are keyless.

Which Development API works from the browser?

Icanhazip API, Index Agentica API and Open VSX API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.

How are these APIs ranked?

Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.