Developer API Directory

Every developer API in our index, ranked by agentic readiness. All entries expose at least one programmatic signal agents can discover at build time.

4191
Sites Indexed
36
Avg Score
1243 entries in this directory
Cross Browser Testing & Mobile App Testing | TestingBot
testingbot.com
Instant access to over 6100 browsers with physical iOS and Android devices. Parallel Testing. Automated Testing. Boost your UI test suite in minutes with TestingBot.
llms.txt OpenAPI API AI bots Schema.org developer
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Social Data API for AI Agents — Brand Monitoring, Listening, Intel | XPOZ
xpoz.ai
One API for brand monitoring, social listening, lead generation, and competitive intelligence across Twitter/X, Instagram, TikTok, and Reddit. MCP server + typed SDKs for Claude Code, Codex, Gemini CLI. No platform API keys.
llms.txt ai-plugin API AI bots Schema.org developer
70
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
F
fabric-api-393345198409.us-west1.run.app
fabric-api-393345198409.us-west1.run.app
llms.txt OpenAPI API MCP developer
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
VirtualSMS — Receive SMS Online | Real Physical SIMs | 145+ Countries
virtualsms.io
Real SIM cards for OTP verification — 145+ countries, 2500+ services (WhatsApp, Telegram, Discord). From $0.05/code. API + MCP server for developers and AI agents.
llms.txt OpenAPI API AI bots Schema.org developer
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Context7 - Up-to-date documentation for LLMs and AI code editors
context7.com
Pull up-to-date, version-specific documentation and code examples for any library directly into Cursor, Claude Code, Windsurf, and other AI coding tools.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Full-stack observability for the agentic era | Grafana Labs | Grafana Labs
grafana.com
Avoid lock-in and ensure reliability with Grafana Cloud. The AI-powered platform built on open standards unifies metrics, logs, traces, profiles, and business data.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
CrewAI
crewai.com
The Leading Multi-Agent Platform
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Expired Domain Finder - 218,616 Domains, 37,715 Added Today - CatchDoms
catchdoms.com
Discover thousands of expiring domains from Dynadot, GoDaddy, Catched & DropCatch. Filter by age, backlinks, DA and find hidden gems with our quality score system.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Librarian Nexus | Agent Lesson Library and Certification Pathways
librarian-nexus-520904066816.us-west1.run.app
Librarian Nexus is the training and memory system for AI agents, combining hard-won lessons, verified workflows, CTIA-A threat intelligence training, upcoming bug hunting, stocks, and healthcare tracks, plus free upkeep material for certified agents.
llms.txt ai-plugin AI bots Schema.org MCP developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
High-Performance Blockchain Infrastructure
quicknode.com
Build and scale blockchain applications on fast, reliable, enterprise-grade infrastructure across 80+ chains. Developer-ready, globally optimized.
llms.txt ai-plugin API Schema.org developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Unmarkdown™ - Markdown Converter & Publishing Platform
unmarkdown.com
AI tools output markdown. Your apps don't understand it. We fix that instantly. Convert markdown to perfectly formatted text for Google Docs, Email, Word, Slack, OneNote, and more.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
unulu™ — Create Link-in-Bio Sites via AI, MCP, or API
unulu.ai
Build and publish a link-in-bio page in seconds. Talk to any AI agent — Claude, ChatGPT, Gemini — and get a live site on unu.lu. Free, no signup. MCP server and REST API for developers.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Tianji = Website Analytics + Uptime Monitor + Server Status | Tianji
tianji.msgbyte.com
All-in-One Insight Hub. Tianji = Website Analytics + Uptime Monitor + Server Status
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Primev - Ethereum mev Research & Preconfirmations Infrastructure
primev.xyz
Leading Ethereum mev research organization building preconfirmations infrastructure for faster web3 transactions, reduced latency, and improved blockchain speed. Backed by top venture capital.
llms.txt ai-plugin API AI bots developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Welcome to Val Town | Docs | Val Town
docs.val.town
Deploy agents, APIs, static sites, apps, and crons with JavaScript
llms.txt OpenAPI API AI bots developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
A
arifOS Observatory · ΔΩΨ · Federation Governance Hub
arifos.arif-fazil.com
arifOS MCP Observatory v2.0 — Live constitutional governance dashboard. Federation hub for arifOS, GEOX, WEALTH, WELL, A-FORGE, and AAA.
llms.txt ai-plugin API AI bots developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Open Source Chart Image API | QuickChart
quickchart.io
Create a chart image with one API call and embed it anywhere. Send charts in email and other platforms. Open source, no watermarks, used by thousands of developers.
llms.txt ai-plugin OpenAPI developer
65
+25 llms.txt +20 ai-plugin missing +15 structured API
FlowCheck: Financial analytics API
developer.usepopup.com
Connect Stripe, Shopify, and your bank account to get programmable access to revenue, expenses, and cash flow. Build internal dashboards, automate reporting, or run analysis scripts. One API key, 5 minutes to integrate.
llms.txt ai-plugin API Schema.org developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
RAE API - Diccionario RAE
rae-api.com
API no oficial del diccionario de la Real Academia Española
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
ReqRes | Free REST API for developers | ReqRes
reqres.in
Free REST API for testing and prototyping with real responses, no signup needed. Or build your own backend with collections, auth, and logs at app.reqres.in.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
myClaude — Claude Code Ecosystem Marketplace
myclaude.sh
Discover, share, and monetize skills, squads, agents, workflows, and design systems for Claude Code.
llms.txt ai-plugin API AI bots developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Saasforit.com - Find the Best SaaS Tools for Your Business | 150+ Curated Software Solutions
saasforit.com
Discover 150+ curated SaaS tools with smart AI recommendations. Find project management, CRM, marketing, HR, finance, and developer tools. Free SaaS directory with intelligent matching.
llms.txt ai-plugin AI bots Schema.org MCP developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
PingZen - Free Website Uptime Monitoring & Instant Alerts
pingzen.dev
Know when your site goes down. Before your users do. Website uptime monitoring with instant alerts via Telegram, Slack, Discord and more.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
crates.io: Rust Package Registry
crates.io
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
VisioForge — Video Capture, Edit & Playback SDKs for .NET
visioforge.com
Video and audio SDKs for C#, VB.NET, Delphi. Capture, edit, and play video on Windows, macOS, Linux, iOS, Android. 30-day free trial.
llms.txt API AI bots Schema.org MCP developer
60
+25 llms.txt +15 structured API missing +20 ai-plugin
Trusted Website Screenshot Service, flawless full page captures and more. | Urlbox
urlbox.io
Take accurate screen grabs of web content with Urlbox. Trusted by 700+ customers generating thousands of images per minute. Start your free trial today.
llms.txt ai-plugin API developer
60
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
D
docs.atla-ai.com
docs.atla-ai.com
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Semgrep App Security Platform | AI-assisted SAST, SCA and Secrets Detection
semgrep.dev
An extensible developer-friendly application security platform that scans source code to surface true and actionable security issues with AI-assisted SAST, SCA, and Secrets Detection solutions.
llms.txt ai-plugin API developer
60
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Jono Tho'ra — Archangel Agency | Building the Infrastructure for What Comes After
jono.archangel.agency
I discovered Universal Language — a formally derivable geometric structure capable of encoding all possible meaning relationships. The game I wrote to describe it became the design spec for infrastructure I'm now building: platform-independent communication, AI alignment through ontological context, and community intelligence tools. The research is public at github.com/Jthora/universal_language.
llms.txt API AI bots Schema.org MCP developer
60
+25 llms.txt +15 structured API missing +20 ai-plugin
D
docs.anchorbrowser.io
docs.anchorbrowser.io
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin

Wire NHS into your agent — MCP server

Add Not Human Search as an MCP tool. Your agent can call search_agents, get_site_details, get_stats, and submit_site at runtime.

Claude Code
claude mcp add --transport http nothumansearch https://nothumansearch.ai/mcp
Other clients: point any MCP-compatible tool at https://nothumansearch.ai/mcp (streamable-http transport).

Use NHS via REST

Prefer plain HTTP? Hit the search endpoint directly.

Search API
curl "https://nothumansearch.ai/api/v1/search?q=payment+API"
Agent Docs
llms.txt OpenAPI spec ai-plugin.json

Hiring AI / agentic engineers?

Live feed of AI/agent roles from AI Dev Jobs — 8,000+ positions, 489 companies:

Free: Monitor Your Agentic Readiness

We'll email you when your site's agent signals regress — so you catch it before your AI traffic drops. One email per week, only on real regressions.

Set up free monitoring →

Submit Your Site

Get crawled and scored on agentic readiness. Appear in agent search results.

Use the public homepage. NHS checks standard paths like /llms.txt, OpenAPI, MCP, robots, and schema.