API Directory for AI Agents & Developers | API Tracker

A lightweight index of APIs, MCP servers, and frameworks for your agent.
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19,065 API profiles and 167,897 MCP listings in one index for developers and their agents, each with sources you can check.
Help developers discover what you’ve built.
Useful APIs for ambitious ideas, each with sources you can check.
Build assistants that reason, write code, and use tools with the Claude API.
AI modelsLanguage modelsTool use
Connect accounting and ERP software through unified APIs and give agents access through MCP.
Business APIsUnified APIsAccountingMCP
Turn websites into structured data and readable content for AI applications.
Search & dataWeb scrapingExtraction
Search the web and retrieve page content for AI research and agent workflows.
Search & dataWeb searchResearch
Connect AI tools to your Supabase projects to query data and manage development workflows.
Developer toolsDatabaseMCP
Give AI assistants access to Stripe tools for payments and business operations through MCP.
Business APIsPaymentsMCP
Ask Claude or ChatGPT about company spend, subscriptions, invoices and runway through Husk’s MCP server.
Business APIsSpend managementMCP
Add speech generation, transcription, and conversational voice experiences to your app.
Voice & audioText to speechVoice agents
Send transactional emails from your application with an API built for developers.
Business APIsEmailNotifications
Build enterprise AI with language models, embeddings, and reranking for retrieval workflows.
AI modelsEmbeddingsReranking
Store and search vector data to retrieve relevant context for AI applications.
Search & dataVector databaseRetrieval
Search the web and extract content for research agents and AI applications.
Search & dataWeb searchResearch
Run supported language and audio models through Groq’s inference API.
AI modelsInferenceAudio
Connect AI assistants to workspace content using Notion’s hosted MCP server.
Developer toolsKnowledgeMCP
Starting points for common builds, each a reviewed set of APIs.
Connect a model to useful context and real-world actions.
Search, extract, and retrieve the context your application needs.
Bring speech and conversation into your next product.
Bring project context and tools into your development workflow.
Explore model developers and inference platforms with official API documentation.
Explore provider differences before you commit.