AgentAPI

A curated directory of APIs designed for AI agents. Machine-readable. MCP-compatible. Agent-accessible.

Website: https://agentapihub.com

Docs: https://api.agentapihub.com/api/docs

Free Features

The directory and search functionality is completely free:

# Browse all APIs (FREE)
curl https://agentapihub.com/api/v1/apis

# Search by capability (FREE)
curl "https://agentapihub.com/api/v1/apis?q=send+email&mcp=true"

# Filter by category (FREE)
curl "https://agentapihub.com/api/v1/apis?category=ai"

x402 Pay-Per-Use APIs

Some APIs are available through x402 — a pay-per-use protocol using USDC on Base chain.

Available x402 APIs

| API | Endpoint | Approx. Price |

|-----|----------|---------------|

| Gemini Chat | /api/gemini/chat/completions | ~$0.001/req |

| Gemini Embeddings | /api/gemini/embeddings | ~$0.0005/req |

How x402 Works

1. Call the API endpoint
2. Receive 402 Payment Required with price details
3. Send USDC payment on Base chain
4. Retry request with payment proof
5. Receive API response

⚠️ Important Safety Notice

x402 payments require explicit setup and should not be automated without safeguards:

• Wallet required: You must configure a wallet with USDC on Base
• User approval recommended: Implement confirmation flows before any payment
• Verify recipient: The payment recipient is 0xcCb92A101347406ed140b18C4Ed27276844CD9D7 (gizmolab.eth)
• Set spending limits: Configure maximum per-request and daily limits
• This skill does not auto-execute payments — it provides documentation only

For implementation details, see: https://api.agentapihub.com/api/docs

Directory Categories

| Category | APIs | Example |

|----------|------|---------|

| Search | Brave, Serper, Exa, Tavily, Perplexity | Web search with AI summaries |

| AI & ML | OpenAI, Claude, Gemini, Groq, Replicate | LLM inference, image gen |

| Communication | Resend, Twilio, Slack, Discord, Telegram | Email, SMS, messaging |

| Database | Supabase, Pinecone, Qdrant, Neon, Upstash | SQL, vectors, KV store |

| Payments | Stripe, Lemon Squeezy, PayPal | Payment processing |

| Scraping | Firecrawl, Browserbase, Apify | Web scraping, automation |

| Developer | GitHub, Vercel, Linear, Sentry | Code, deploy, issues |

| Productivity | Notion, Google Calendar, Todoist | Tasks, scheduling |

MCP-Compatible APIs

All 50+ APIs in the directory are MCP-compatible. Filter with ?mcp=true.

API Response Format

{
  "id": "resend",
  "name": "Resend",
  "description": "Modern email API for developers",
  "category": "communication",
  "provider": "Resend",
  "docs": "https://resend.com/docs",
  "auth": "api_key",
  "pricing": "freemium",
  "pricingDetails": "3,000 free/mo, then $20/mo",
  "rateLimit": "10 req/sec",
  "mcpCompatible": true,
  "x402Enabled": false,
  "tags": ["email", "transactional", "notifications"]
}

Top APIs by Category

Search

• Brave Search - Privacy-focused, 2k free/mo
• Exa - Neural/semantic search for AI
• Tavily - Built specifically for AI agents

AI & ML

• OpenAI - GPT-4, DALL-E, Whisper
• Anthropic Claude - Best for reasoning/coding
• Groq - Fastest inference (500+ tok/sec)

Communication

• Resend - Simple email API, 3k free/mo
• Twilio - SMS/voice, industry standard
• Slack/Discord/Telegram - Team messaging

Database

• Supabase - Postgres + auth + storage
• Pinecone/Qdrant - Vector DBs for RAG
• Upstash - Serverless Redis

Usage Examples

# Find an API for sending emails
Search AgentAPI for "email" → Returns Resend, SendGrid, Twilio

# Find vector databases for RAG
Search AgentAPI for "vector embeddings" → Returns Pinecone, Qdrant, Weaviate

# Find fast LLM inference
Search AgentAPI for category "ai" + filter by latency → Returns Groq, Gemini Flash

Contributing

Submit new APIs at https://agentapihub.com (Submit API link in footer).

Built By

GizmoLab (@gizmolab_) — gizmolab.io