What is 4agent?
4agent is a curated directory of APIs, MCP servers, and developer services that AI agents can use to search, act, store data, communicate, and deploy software.
Discover 191+ tools your agent can find, evaluate, and call. Add your tool and reach thousands of developers instantly.
191+ tools already listed
Curated by Michael Yu · Last reviewed
Explore tools organized by what they do
Browse the complete catalog of agent-ready tools
191 tools
Hosted infrastructure for deploying persistent AI agents
Deep Lake database for multimodal AI and agent memory
A wallet and paid API marketplace built for AI agents
Visual agent builder that exports production-ready TypeScript
Identity and permissioning for AI agents through a governed MCP gateway
Email inbox API for AI agents — give your agent its own email address
Session replay, monitoring, and evaluation for AI agents
Semantic web interaction and data extraction for AI agents
Full-stack cloud platform built for AI agents
Data and context layer for production AI agents
Open-source context retrieval for AI agents
AI-powered search and discovery API for developers
Cloud platform for web scraping, crawlers, and automation Actors
MCP runtime for secure, production AI agent tool use
Stateful service twins for testing and training AI agents
Open-source tracing and evaluation for LLM applications
Host WordPress in Shopify subfolders and export Notion docs to your CMS
Speech AI APIs for transcription, understanding, and voice agents
Identity and delegated authorization for AI agents
Email platform for developers and AI agents — transactional and marketing
Cloud-native logs, traces, and event data for agent systems
Observability, testing, and evaluations for LLM applications
Monitoring and learning for long-running AI agents
The most comprehensive authentication framework for TypeScript
Enterprise API platform for automated AI phone calls
Perpetual sandbox platform — sandboxes that sleep but never die
BAML programming language for reliable structured AI outputs
Evaluation, tracing, and prompt management for AI products
Privacy-focused search API with web, news, image, and video endpoints
Headless browser infrastructure built for AI agents
Directory methodology
We publish concise, structured facts so developers and agents can compare tools without guessing how each service integrates.
4agent is a curated directory of APIs, MCP servers, and developer services that AI agents can use to search, act, store data, communicate, and deploy software.
Each listing is reviewed for a working product website, a clear agent use case, and practical integration signals such as an API, MCP support, OpenAPI documentation, authentication, SDKs, and pricing.
Integration fields are checked against the official Model Context Protocol specification and OpenAPI Specification.
The catalog is reviewed as new tools are submitted and existing listings change. Each public submission is held as a draft until it passes manual review.
Tool pages also expose machine-readable SoftwareApplication data for automated discovery.
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