Build assistants that reason, write code, and use tools with the Claude API.
AI modelsLanguage modelsTool use
Documentation Source reviewed
Find the API. Ship the agent.
19,065 API profiles and 167,896 MCP listings in one index for developers and their agents, each with sources you can check.
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Handpicked APIs
Useful APIs for ambitious ideas, each with sources you can check.
14 curated API providersCurated summaries reviewed
Connect accounting and ERP software through unified APIs and give agents access through MCP.
Business APIsUnified APIsAccountingMCP
Documentation Source reviewed
Turn websites into structured data and readable content for AI applications.
Search & dataWeb scrapingExtraction
Documentation Source reviewed
Search the web and retrieve page content for AI research and agent workflows.
Search & dataWeb searchResearch
Documentation Source reviewed
Connect AI tools to your Supabase projects to query data and manage development workflows.
Developer toolsDatabaseMCP
Documentation Source reviewed
Give AI assistants access to Stripe tools for payments and business operations through MCP.
Business APIsPaymentsMCP
Documentation Source reviewed
Ask Claude or ChatGPT about company spend, subscriptions, invoices and runway through Husk’s MCP server.
Business APIsSpend managementMCP
Documentation Source reviewed
Add speech generation, transcription, and conversational voice experiences to your app.
Voice & audioText to speechVoice agents
Documentation Source reviewed
Send transactional emails from your application with an API built for developers.
Business APIsEmailNotifications
Documentation Source reviewed
Build enterprise AI with language models, embeddings, and reranking for retrieval workflows.
AI modelsEmbeddingsReranking
Documentation Source reviewed
Store and search vector data to retrieve relevant context for AI applications.
Search & dataVector databaseRetrieval
Documentation Source reviewed
Search the web and extract content for research agents and AI applications.
Search & dataWeb searchResearch
Documentation Source reviewed
Run supported language and audio models through Groq’s inference API.
AI modelsInferenceAudio
Documentation Source reviewed
Connect AI assistants to workspace content using Notion’s hosted MCP server.
Developer toolsKnowledgeMCP
Documentation Source reviewed
What are you building?
Starting points for common builds, each a reviewed set of APIs.
Build an AI agent
Connect a model to useful context and real-world actions.
42 APIsGive your AI the web
Search, extract, and retrieve the context your application needs.
11 APIsBuild with voice
Bring speech and conversation into your next product.
2 APIsConnect your coding agent
Bring project context and tools into your development workflow.
13 APIsAI model APIs
Explore model developers and inference platforms with official API documentation.
14 APIsCompare providers
Explore provider differences before you commit.
New in the catalog
The latest dated additions. These are listing dates, not launch dates.
APIs
All new APIs- TurboDocxAPI profile
- VectoSolve APIAPI profile
- RouteMuxAPI profile
- gasrentAPI profile
MCP servers
All new MCPs- Loop VoiceProvides read-only access to Loop Voice workspace activity through OAuth.
- apteka.onlineSearches pharmacy product and medicine reference information. It does not diagnose or provide individualized medical advice.
- AllClear LendingProvides lender and program reference lookups. Matches are estimates, not lending offers or legal advice.
- 3D Valley MCP ServerConnects assistants to 3D Valley model-generation workflows through OAuth.
- ProveCartCompares purchase intentions and proposed orders before payment. Verification results are not guarantees of future behavior.
Developer tools by Apideck
Tools the Apideck team maintains for testing, debugging and connecting APIs.
Portman
Turn OpenAPI specifications into Postman collections with contract and variation tests. Run them with Newman in your CI pipeline.
Better Ajv Errors
Turn Ajv validation errors into readable API error messages, with paths and suggestions for spelling mistakes. Requires Ajv 8 or newer.
MCP Connect
Questions about API Tracker
How the directory is built, what it covers and how fresh it is.
How we curate the directory →One registry for developers and agents →What is API Tracker?
API Tracker is a directory for discovering APIs, developer tools, and MCP servers. Browse provider profiles, explore documentation and SDKs, or use curated collections to find tools for a specific project.
What is the difference between an API and an MCP server?
An API defines how software accesses a service. An MCP server exposes tools and context using the Model Context Protocol so compatible AI clients can discover and use them. An MCP server often calls an existing API behind the scenes.
How should I choose an API for an AI agent?
Start with the task your agent needs to complete. Compare documentation, authentication, tool permissions, rate limits, pricing, and reliability. Test with your own workload, and check MCP support when your chosen client uses it.
How fresh is the directory data?
The curated discovery entries show a review date and link to the provider documentation used for their summaries. The wider catalog is maintained separately and may have different update dates. A review date is not a guarantee of uptime or unchanged pricing; check the provider’s documentation before integrating.