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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.

5542
Sites Indexed
39
Avg Score
1693 entries in this directory
LoginWA: WhatsApp API for OTP, Notifications & Broadcast
loginwa.com
WhatsApp for OTP, notifications, broadcast, and auto-reply. Use the API with keys, webhooks, and SDKs, or run blast and contacts from the dashboard. Free 100 messages/month, from $1. Card or QRIS.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
rustunnel — open-source secure tunnel for localhost, webhooks & AI agents
rustunnel.com
Open-source secure tunnel that exposes localhost to the internet. Pay-as-you-go from $3/month, free self-hosting under AGPL, and an MCP server for any agent harness — Claude Code, Codex, Cursor, Windsurf, Cline, and more.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Creed Space: Open Infrastructure for AI Safety
creed.space
Free, open-source AI safety infrastructure for policy enforcement, verifiable decision receipts, portable values, and accountable deployment.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
A
AIDC-AI.IO Design Engine
aidc-ai.io
AI Data Center Infrastructure Design Engine — site selection, OPR/BOD, rackPlan, power, cooling, validation, cost, schedule, and procurement artifacts from one 3D graph.
llms.txt ai-plugin OpenAPI developer
65
+25 llms.txt +20 ai-plugin missing +15 structured API
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, Codex, Devin Desktop, Antigravity 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
2s — the (most) everything API
2s.io
The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.
llms.txt ai-plugin AI bots Schema.org MCP developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
MCP Central
mcpcentral.io
Discover and integrate Model Context Protocol servers with documentation, use cases, and tutorials.
llms.txt ai-plugin API AI bots 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
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
Create Beautiful Twitter Screenshots in Seconds - TwitterShots
twittershots.com
Turn any Tweet or X post into stunning share-ready images. API, bulk processing & custom branding. Trusted by 10,000+ creators.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
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
Legal Services in Spain | Legal Fournier
legalfournier.com
Legal Fournier advises international clients on Spanish residency, tax, property, business, and cross-border legal matters across Spain.
llms.txt OpenAPI API Schema.org developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
learning.postman.com
learning.postman.com
llms.txt OpenAPI API AI bots developer
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
R
Remote Jobs API — one API for all remote jobs
remote-jobs-api.tten.no
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
AI agent social network | SNAIL — Social Network for Autonomous Intelligent Life
joinsnail.com
SNAIL is a public social network for AI and software agents. Meet across runtimes, ask for second opinions and share useful work. Agents participate; humans observe.
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Agent Embassy — Agents pay for work and prove what happened
agent-embassy.fly.dev
Agents pay for work and prove what happened.
llms.txt OpenAPI Schema.org MCP developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
E
Vend API Merchant — Pay-per-call APIs settled in Nano (XNO)
extract.paypercall.dev
Pay-per-call AI-agent APIs settled in Nano (XNO): URL extraction, link checking, domain intelligence, web search, IP geolocation. No signup, no API keys, no fees.
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
Screenshots you'll stake your reputation on, flawless full page captures and more. | Urlbox
urlbox.io
Take accurate screen grabs of web content with Urlbox. Trusted by 1,700+ 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
P
Postman: The World's Leading API Platform | Sign Up for Free
postman.com
Accelerate API development with Postman's all-in-one platform. Streamline collaboration and simplify the API lifecycle for faster, better results. Learn more.
llms.txt API AI bots Schema.org MCP developer
60
+25 llms.txt +15 structured API 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

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