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OpenAPI Spec Directory

Every API in our index that publishes an OpenAPI/Swagger spec — ranked by agentic readiness.

5724
Sites Indexed
39
Avg Score
977 entries in this directory
AI Crawler Index — 150 AI crawlers, their robots.txt tokens and IP ranges
crawlers.pathwren.workers.dev
Every AI crawler on the web, what it is for, what blocking it costs you, and the IP ranges its operator publishes — as JSON, CSV, robots.txt and regex.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
AgentResolver — x402 Payment Preflight & PayTo Verification
agentresolver.vercel.app
Verify an x402 endpoint before paying: live payTo, USDC quote, network, asset, resource binding, TLS and endpoint safety for $0.001 on Base or Solana.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
A
Agentprobe — Agentic Commerce Readiness
agentprobe.fly.dev
Test any seller URL for agentic commerce readiness.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
AgentNDX — MCP Server Directory
agentndx.ai
The curated registry for the agentic web. Browse 1336 hand-picked MCP servers, A2A agents, and x402-enabled services — free for humans, queryable by agents.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
Agent Domain Search
agentdomainsearch.com
Agent-first domain registration and DNS management. Pay with USDC on Base via x402. No accounts, no API keys.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
TwexAPI: Public Social Data API for X (Twitter) | Pay-As-You-Go Alternative
twexapi.io
Fast, reliable public data API for X (Twitter) and AI agent integrations. Search posts, access public feeds, research user profiles, and publish content with predictable pay-as-you-go credits.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
ToolOracle — Capability Router for Autonomous Agents
tooloracle.io
OracleNet is a mesh capability router for autonomous agents. Discover, route, verify and call external capabilities via MCP or A2A. Free discovery and soft handshake. Settlement uses x402 / USDC on Base where required. Live mesh snapshot at /.well-known/agent-pulse.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
rendoc — Generate PDFs with code
rendoc.dev
PDF API for developers. Generate PDF from HTML, create invoice PDFs, contracts and reports programmatically. HTML to PDF conversion with a simple REST API and MCP server for AI agents. Free tier included.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
primitive.dev: email for AI agents
primitive.dev
Primitive is email infrastructure for AI agents: universal email addresses, hosted functions, and transactional email over the protocol every business already uses. It also ships a ChatGPT app — an in-agent MCP App UI built on the OpenAI Apps SDK that renders your inbox inside the agent host.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
GPT Researcher - Autonomous AI Research Agent
gptr.dev
GPT Researcher is an open-source autonomous AI research agent that produces deep, multi-source research reports with inline citations. #1 on Carnegie Mellon's DeepResearchGym benchmark.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
Gluon Stablecoin Protocol
gluon-landing-page-ve5h.vercel.app
Gluon W is a dual-token stabilization protocol. Split base tokens into neutrons (stable) and protons (volatile), or merge them back. DeFi-native mechanics with dynamic fees.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
FlowZap — The fastest diagram builder for workflows, sequence and architecture diagrams.
flowzap.xyz
Create workflow, sequence and architecture diagrams in seconds. 250+ ready-to-use templates. MCP server for AI agents. Export to n8n & Make.com. Free to use.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP developer
100
+25 llms.txt +20 ai-plugin
AI Dev Jobs — 9147 AI Developer Jobs · Hire ML Engineers
aidevboard.com
Browse 9147 AI developer jobs in PyTorch, TensorFlow, LLMs, RAG, and computer vision. Compare roles, salary data, and requirements.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP jobs
100
+25 llms.txt +20 ai-plugin
Not Human Search — Is Your Site Visible to AI Agents? Agent-Readiness Search & Score
nothumansearch.ai
Check if AI agents can find and use your site. Not Human Search scores any site 0–100 on 7 agentic signals — llms.txt, OpenAPI, MCP, Schema.org & more — and indexes 8,000+ agent-ready sites. Free instant score.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
A
370.AI — 一站式 AI 网关 | 一个 API Key 调用 OpenAI/Claude/Gemini
370.ai
一站式 AI 网关 — 一个 API Key 统一调用 OpenAI / Claude / Gemini / AWS Bedrock / 通义千问 / 字节豆包 等主流大模型, OpenAI 兼容协议, 实时计费, 覆盖 文本对话/图像生成/视频生成/向量嵌入/语音 全模态.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
DePIN Intelligence for Research & Diligence | Kairos Signal
kairossignal.com
Inspect DePIN capacity, usage, supply, and economic activity with source-linked data. Explore coverage and samples before choosing access or scoped diligence.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP other
100
+25 llms.txt +20 ai-plugin
Sansasyonel Gazete | Ana Sayfa
sansasyonelgazete.com
Sansasyonel Gazete ile seyahat, turizm ekonomisi, havacılık ve küresel ekonomideki güncel gelişmeleri yakından takip edin.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP news
100
+25 llms.txt +20 ai-plugin
Manşet Etkisi | Ana Sayfa
mansetetkisi.com
Manşet Etkisi ile finans, ekonomi, piyasalar, yatırım ve makroekonomideki güncel gelişmeleri güvenilir ve anlaşılır içeriklerle takip edin.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP news
100
+25 llms.txt +20 ai-plugin
AstraNL — Vertel wat u nodig heeft
astranl.com
Vertel wat u nodig heeft — wij regelen de rest. Mensen, agents en machines, gecoördineerd voor 1%.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP other
100
+25 llms.txt +20 ai-plugin
ContrastAPI — Security Intelligence API
api.contrastcyber.com
Free security intelligence API and MCP server with 55 tools: CVE, domain recon, threat intel, MITRE ATLAS, D3FEND, code security. No API key required.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP data
100
+25 llms.txt +20 ai-plugin
BRUNOSAN BOT PRODUCTIONS
brunosan.de
BrunoSan Intelligence exposes source-linked intelligence objects across eleven domains through MCP and structured APIs. Operated by DoWell Consulting UG in Hamburg, Germany.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
Gluon Stablecoin Protocol
gluon.stability.nexus
Gluon W is a dual-token stabilization protocol. Split base tokens into neutrons (stable) and protons (volatile), or merge them back. DeFi-native mechanics with dynamic fees.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP other
100
+25 llms.txt +20 ai-plugin
Hlido · We test AI tools. We build technology for businesses. Prague
hlido.eu
Hlido tests AI agents and tools by hand and publishes the evidence, free to read. The same desk is a technology consulting practice: strategy, advisory, implementation and delivery, from ideation to development to post-production support. Prague, EU.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
send21 — Non-Custodial Crypto Payment Drafts & Pay Links (BTC, USDC, USDT, EURC) for Humans & AI Agents
send21.io
Create non-custodial payment drafts and checkout pay links for BTC, USDC, USDT, and EURC. Funds move directly from the sender’s own wallet — send21 never holds keys or funds. First-class REST API for AI agents: scoped keys, idempotent creation, signed webhooks.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
AI Agents Archive — save money, earn USDC, reuse frontier work
aiagentsarchive.com
AI agents: save money by unlocking sealed research instead of redoing it. Earn USDC (filer 90%) by filing finished work. Use better model output without a frontier seat — when a stronger agent files the result, weaker agents continue from there. Filing and replay are free. Buyer pays listed price. X-PAYMENT settles on Base; Website Pay without X-PAYMENT is a desk receipt.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
Agent Community — open community for agent builders
agentdomain.xyz
An open community of the companies, researchers, and developers building the agentic web. Open specs, open work streams, a public member map. Free to join.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
Ainglish | An English dialect for AI agents
ainglish.org
A developing dialect of English, optimised for clearer and more efficient communication between AI agents. Shaped through an open, evidence-led process.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
Agenty — one link, every handle
agenty.im
One link, every handle — the link page for AI agents.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +20 ai-plugin
The Agent Museum — The first museum of the agent era
agentmuseum.org
A verifiable museum of the agent era. Every exhibit carries cryptographic proof that it existed by a provable date, has not been altered, and was vouched for by a verified identity.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP other
100
+25 llms.txt +20 ai-plugin
B
8bitconcepts — Embedded AI consulting for operating businesses
8bitconcepts.com
We sit inside your business and ship the AI workforce + process systems your team will actually use. Practitioners — same people who run our live products and write our research.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP ai-tools
100
+25 llms.txt +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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