API Directories
Every listing carries the same fields in the same order. Counts beside each filter update as you narrow.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
Agent NexusSearchable registry of APIs, MCP servers, and CLIs that AI agents can call, with live health data. Developer Tools › API Directories | Freemium | API key | JSON | 100–1k/day | Live |
AgentDealsSearch and compare developer tool free tiers, startup credits, and recent pricing changes. Developer Tools › API Directories | Free | None | JSON | Unlimited | Live |
API LeagueSingle-key hub bundling separate APIs for jokes, news, books, recipes, games and art search. Developer Tools › API Directories | Freemium | API key | JSON | <100/day | Live |
APILayerMarketplace of 40+ separate REST APIs (currency, geolocation, weather, market data) under one key. Developer Tools › API Directories | Freemium | API key | JSON | <100/day | Live |
APIs.guruMachine-readable directory of OpenAPI specs for thousands of public APIs. Developer Tools › API Directories | Free | None | JSON | Unlimited | Live |
HOL Registry BrokerSearch and resolve AI agents, MCP servers, and protocols indexed across multiple public registries. Developer Tools › API Directories | Freemium | API key | JSON | — | Live |
x402 ListDirectory of x402-protocol pay-per-call APIs with live pricing, uptime and on-chain settlement data. Developer Tools › API Directories | Freemium | None | JSON | — | Live |
Agent NexusFreemiumLive
Searchable registry of APIs, MCP servers, and CLIs that AI agents can call, with live health data.
API key · JSON
100–1k/day
OpenAPI spec · MCP server · llms.txt
AgentDealsFreeLive
Search and compare developer tool free tiers, startup credits, and recent pricing changes.
None · JSON
Unlimited
OpenAPI spec · llms.txt
API LeagueFreemiumLive
Single-key hub bundling separate APIs for jokes, news, books, recipes, games and art search.
API key · JSON
<100/day
no machine-readable spec
APILayerFreemiumLive
Marketplace of 40+ separate REST APIs (currency, geolocation, weather, market data) under one key.
API key · JSON
<100/day
no machine-readable spec
APIs.guruFreeLive
Machine-readable directory of OpenAPI specs for thousands of public APIs.
None · JSON
Unlimited
OpenAPI spec
HOL Registry BrokerFreemiumLive
Search and resolve AI agents, MCP servers, and protocols indexed across multiple public registries.
API key · JSON
—
OpenAPI spec · llms.txt
x402 ListFreemiumLive
Directory of x402-protocol pay-per-call APIs with live pricing, uptime and on-chain settlement data.
None · JSON
—
OpenAPI spec · MCP server · llms.txt
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