OpenAPI Spec Directory
Every API in our index that publishes an OpenAPI/Swagger spec — ranked by agentic readiness.
4359
Sites Indexed
37
Avg Score
608 entries in this directory
FirstData - Global Authoritative Data Source Knowledge Base | MCP Server
firstdata.deepminer.com.cn
FirstData provides 290+ authoritative data sources for MCP and AI agents, including government data, academic research, and verified datasets. Build smarter AI applications with trusted data.
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
V
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
SuperSend API - Email Automation REST API
docs.supersend.io
Build powerful email automation with the SuperSend API. Everything you can do in the dashboard, you can do programmatically. REST API for contacts, campaigns, webhooks, senders, and more.
OpenAPI
AI bots
Schema.org
developer
30
+20 OpenAPI
+5 AI robots
missing +25 llms.txt
P
Códigos postales de México — Postali
postali.app
Directorio abierto con 158,808 entradas en los 32 estados de México. Consulta cualquier código postal en segundos · Fuente Sepomex.
OpenAPI
AI bots
Schema.org
other
30
+20 OpenAPI
+5 AI robots
missing +25 llms.txt
S
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
R
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
O
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
L
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
L
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
P
30
+20 OpenAPI
+10 MCP
missing +25 llms.txt
buildez.ai - Build. Sell. Earn Forever.
buildez.ai
Build professional websites with AI, sell them to clients, and earn recurring revenue forever.
OpenAPI
Schema.org
ai-tools
25
+20 OpenAPI
+5 Schema.org
missing +25 llms.txt
H
Avukatım - Yapay Zeka Akıllı Hukuk Asistanı & Mevzuat ve İçtihat Kütüphanesi
ve MCP
hukuk.damdafa.com
Avukatım uygulaması ile binlerce kanun, yargıtay kararı ve mevzuatı saniyeler içinde tarayın. Yapay zeka destekli akıllı hukuk asistanınız ile sözleşme analizi yapın ve hukuki sorularınıza anında yanıt bulun.
OpenAPI
Schema.org
productivity
25
+20 OpenAPI
+5 Schema.org
missing +25 llms.txt
livespotting - Videomarketing mit Webcams
livespotting.com
Die Lösung für zeitgemäßes Video-Marketing mit Webcams. Zielgruppen aktivieren und konvertieren. Live-Streaming bis 4K.
OpenAPI
Schema.org
other
25
+20 OpenAPI
+5 Schema.org
missing +25 llms.txt
Dreamhome - AI Interior Design & Virtual Staging
foto.damdafa.com
Create stunning App Store & Google Play screenshots in minutes. Dreamhome helps you design professional, localizable screenshots with device frames, text, and backgrounds.
OpenAPI
Schema.org
ai-tools
25
+20 OpenAPI
+5 Schema.org
missing +25 llms.txt
ExchangeRate-API - Free & Pro Currency Converter API
exchangerate-api.com
Accurate & reliable Exchange Rates API trusted by tens of thousands of developers since 2010. Free access, all world currencies, helpful support & easy to integrate JSON API.
OpenAPI
data
20
+20 OpenAPI
missing +25 llms.txt
Quality-ranked real estate leads from public records — DirtSignal
dirtsignal.com
DirtSignal ranks new property distress records from hundreds of city, county, clerk, parcel, and enforcement sources for real estate investors and acquisition teams.
OpenAPI
ecommerce
20
+20 OpenAPI
missing +25 llms.txt
D
DefaultVerifier — evidence rails for autonomous work
defaultverifier.com
AI agents do the work. DefaultVerifier gives you the receipt — a signed receipt with a proof seal that makes its integrity visible. Verify any receipt yourself; issue your own.
OpenAPI
ai-tools
20
+20 OpenAPI
missing +25 llms.txt
C
20
+20 OpenAPI
missing +25 llms.txt
Eqivo | Open Source Telephony API Platform
eqivo.org
Open Source Telephony/Programmable Voice API platform built on top of FreeSWITCH
OpenAPI
developer
20
+20 OpenAPI
missing +25 llms.txt
Shorten.rest API Documentation
docs.shorten.rest
Comprehensive API documentation for the Shorten.rest URL shortening API.
OpenAPI
developer
20
+20 OpenAPI
missing +25 llms.txt
A
CIS Automotive API
api.autodealerdata.com
The CIS Automotive API provides daily sales, supply, pricing and listing data from
our database of ~40k dealers and over 725M vehicles across the US.
OpenAPI
data
20
+20 OpenAPI
missing +25 llms.txt
lichess.org • Free Online Chess
lichess.org
Free online chess server. Play chess in a clean interface. No registration, no ads, no plugin required. Play chess with the computer, friends or random opponents.
OpenAPI
developer
20
+20 OpenAPI
missing +25 llms.txt
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"
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