1,142 APIs · 4,662+ capabilities · ~100ms · Free tier

One API to
Rule Them All

Describe what you need in plain English.
Get back the right API, endpoint, and working code — in ~100ms.

No signup required to try · Results appear below

🔑 Get Your API Key — Free 🎮 Try the Playground
1,142+
Providers
APIs like Stripe, Twilio, GitHub
4,662+
Capabilities
Actions like "send SMS" or "charge card"
~100ms
Response Time
Semantic match, not keyword search

How It Works

Describe what you need. Get back the right API. Three steps, any use case.

1

You Ask

Describe what you need in plain English — from a terminal, your code, or an AI agent

"Send an SMS to +1234567890"
2

We Match

Semantic search finds the right provider, endpoint, and parameters in ~100ms

→ Twilio · POST /Messages.json
3

You Build

Get back working code snippets, auth setup instructions, and everything you need to call the API

curl, Python, auth guide ✓
👩‍💻

Developers

Stop reading docs for every API. Search in plain English, get copy-paste code, ship faster.

Use the API, CLI, or playground

🤖

AI Agents

Give your agent access to any API with one integration. MCP server, LangChain tools, or raw HTTP.

Use MCP, LangChain, or Agent Skill

🏗️

Teams & Platforms

One API layer for your entire stack. Catalog, auth management, and key vault built in.

Use the API + Key Vault

🔮 Auto-Discover

Not limited to our catalog.

New providers: Query for any API — even ones we've never seen. We scrape docs and generate configs in real-time.
New capabilities: Even for known providers, we discover new endpoints on demand when your query doesn't match existing ones.

1,142+ providers built-in. 4,662+ capabilities. Infinite on demand.

🩺 Auto-Heal

APIs break. We fix them automatically.

When an API returns 404, 410, or deprecation errors, Semantic API detects the stale config, re-discovers the correct endpoint from current docs, patches itself, and retries — all in one request.

Your integration never breaks. Zero maintenance.

Two Modes, Your Choice

Both modes accept the same natural language input — pick the one that fits your workflow

🔍

Discovery

POST /api/query

Get the provider, endpoint, parameters, auth guide, and code snippets. You make the API call.

⚡

Execution

POST /api/query/agentic

Same query, but we call the API for you and return the result. Store credentials once in Key Vault.

One Endpoint → Any API

Your app, script, or agent talks to one endpoint. We handle the routing.

💻

You

App, script, agent, or terminal

→
AI-POWERED

Semantic API

POST /api/query

Understands intent, routes intelligently

→
📱 Twilio
💳 Stripe
🐙 GitHub
📧 SendGrid
☁️ AWS
+ 158 more

Drop Into Any Agent
Framework in Minutes

The Semantic API Skill gives your agent the ability to discover and call any API. Install it, point it at our endpoint, and your agent gains access to 1,142+ providers.

LangChain CrewAI AutoGen Custom Agents Any Framework
⭐ GitHub — Agent Skill
# Install the skill pip install semantic-api-skill # Use in your agent from semantic_api import SemanticAPI api = SemanticAPI() # Agent asks in natural language result = api.query("I need to send an SMS") # Gets back: provider, endpoint, params, auth print(result.provider) # "twilio" print(result.endpoint) # "/2010-04/Messages.json" print(result.params) # {To, From, Body}
# Or use the API directly with curl curl -X POST https://semanticapi.dev/api/query \ -H "Content-Type: application/json" \ -d '{"query": "I need to send an SMS"}'

Native in Claude Desktop

Install the MCP server and use Semantic API as a tool in Claude, ChatGPT, and any MCP-compatible agent.

$ pip install semanticapi-mcp

# Claude Desktop config:
{
  "mcpServers": {
    "semanticapi": {
      "command": "uvx",
      "args": ["semanticapi-mcp"],
      "env": { "SEMANTIC_API_KEY": "your-key" }
    }
  }
}
PyPI → GitHub →

Command Line Tool

Query APIs, discover providers, and test integrations — right from your terminal.

$ pip install semanticapi-cli

$ semanticapi config set-key sapi_your_key
$ semanticapi query "send an SMS via twilio"
$ semanticapi discover stripe
$ semanticapi preflight "get weather forecast"
PyPI → GitHub →

LangChain Integration

Native LangChain tools for API discovery. Drop into any LangChain agent with two lines of code.

$ pip install semanticapi-langchain

# In your agent:
from semanticapi_langchain import SemanticAPIToolkit

toolkit = SemanticAPIToolkit()
tools = toolkit.get_tools() # → semanticapi_query, semanticapi_search
PyPI → GitHub →

Simple Pricing

Start free. Scale when you're ready. Or let your agent pay per query.

Free
$0
100 queries / month
✓ API key access
✓ 4,662+ capabilities
✓ Code snippets
✓ 5 API keys
Get Started — Free
Pro
$29/mo
10,000 queries / month
✓ Everything in Free
✓ 25 API keys
✓ Priority support
✓ Execution mode
Coming Soon
Agent (x402)
$0.01/query
Pay per query with USDC
✓ No account needed
✓ USDC on Base network
✓ Autonomous agents
✓ x402 HTTP protocol
Agent Docs →

Open Source

Inspect the code. Run it yourself. Contribute.

AGPL-3.0

🔮 Semantic API Engine

The core engine that powers semantic matching, provider routing, and capability discovery.

github.com/peter-j-thompson/semanticapi-engine →
MIT

🤖 MCP Server

7-tool MCP server for Claude Desktop, Cursor, and any MCP-compatible agent.

github.com/peter-j-thompson/semanticapi-mcp →
MIT

⌨️ CLI Tool

Query APIs, discover providers, and test integrations from your terminal.

github.com/peter-j-thompson/semanticapi-cli →
MIT

🦜 LangChain Integration

Native LangChain tools — SemanticAPIToolkit with query and search tools.

github.com/peter-j-thompson/semanticapi-langchain →

Start Building
in 60 Seconds

1,142 providers. 4,662+ capabilities. One endpoint. Free to start.

🔑 Get Your API Key — Free 🎮 Playground MCP Server Docs