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Works by exposing a search tool through the Model Context Protocol that filters and ranks results based on keyword and category matching.","intents":["Find a free weather API that doesn't require authentication","Discover public APIs for cryptocurrency data and market information","Search for free geolocation or mapping APIs suitable for prototyping","Locate APIs for specific domains like sports, news, or financial data"],"best_for":["LLM application developers building agents that need to discover and integrate external APIs","Startup founders prototyping MVP features without paid API budgets","AI engineers building tool-use systems that require dynamic API discovery"],"limitations":["Search results limited to pre-indexed public APIs in the database — cannot discover newly launched or unlisted APIs","No real-time API health checking or uptime validation — results may include deprecated or unstable endpoints","Search ranking is basic keyword/category matching without semantic understanding of API capabilities","No filtering by response time, availability SLA, or data freshness guarantees"],"requires":["MCP client implementation (Claude Desktop, LLM framework with MCP support)","Network access to fetch API database (if remote-hosted) or local database file","Understanding of MCP tool schema to properly invoke search parameters"],"input_types":["text (natural language search query)","structured parameters (category filters, authentication type)"],"output_types":["structured JSON (API metadata: name, description, base URL, auth type, rate limits)","text (formatted API summaries for LLM consumption)"],"categories":["search-retrieval","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-public-apis-mcp__cap_1","uri":"capability://tool.use.integration.mcp.tool.registration.for.api.metadata","name":"mcp tool registration for api metadata","description":"Implements the Model Context Protocol specification to expose API discovery functionality as a callable tool within LLM applications. The implementation registers tool schemas that define search parameters, return types, and descriptions in MCP-compliant format, allowing compatible clients (Claude, LLM frameworks) to discover and invoke the capability through standard MCP message passing. Uses tool definition patterns that include input validation schemas and structured output formatting.","intents":["Enable Claude or other MCP-compatible LLMs to call API search as a native tool","Integrate API discovery into multi-step agent workflows without custom code","Allow LLM applications to reason about available APIs during task planning"],"best_for":["Teams building Claude-based agents or applications using MCP","LLM framework developers (LangChain, LlamaIndex) integrating MCP tools","Organizations standardizing on MCP for tool orchestration"],"limitations":["Tool invocation latency depends on MCP transport layer (stdio, HTTP) — adds 50-200ms per call","No built-in caching of search results — repeated queries re-execute database lookups","Tool schema must be manually updated if API database structure changes","Limited to MCP-compatible clients — cannot be used with non-MCP LLM APIs"],"requires":["MCP server implementation (Node.js, Python, or compatible runtime)","MCP client that supports tool calling (Claude Desktop 0.5+, LangChain MCP integration)","JSON schema validation library for input parameter validation"],"input_types":["JSON (MCP tool call with search parameters)"],"output_types":["JSON (MCP tool result with API metadata array)"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-public-apis-mcp__cap_2","uri":"capability://data.processing.analysis.curated.public.api.database.indexing","name":"curated public api database indexing","description":"Maintains and indexes a pre-curated database of free, public APIs with standardized metadata extraction and categorization. The system likely parses API documentation to extract key attributes (endpoints, authentication methods, rate limits, response formats) and organizes them by category (weather, finance, geolocation, etc.) for efficient retrieval. Indexing enables fast lookups and filtering without requiring real-time API introspection or documentation scraping.","intents":["Quickly find APIs in a specific category without manual documentation research","Get standardized metadata about API authentication and rate limits","Filter APIs by features like 'no authentication required' or 'supports CORS'"],"best_for":["Developers who need rapid API discovery during prototyping phases","Teams building API aggregation or integration platforms","Educational contexts teaching API integration patterns"],"limitations":["Database is static and requires manual updates — may lag behind new API releases by weeks or months","Metadata accuracy depends on manual curation — no automated validation that endpoints still work","Limited to APIs that have been manually reviewed and added to the database","No versioning information for APIs with multiple versions"],"requires":["Pre-built API database file (JSON, SQLite, or similar)","Indexing mechanism (in-memory hash map, full-text search engine, or database query layer)","Periodic maintenance process to update API metadata"],"input_types":["structured API metadata (name, category, endpoint, auth type, rate limit)"],"output_types":["indexed records with standardized schema","filtered/sorted result sets"],"categories":["data-processing-analysis","memory-knowledge"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-public-apis-mcp__cap_3","uri":"capability://search.retrieval.category.based.api.filtering.and.faceting","name":"category-based api filtering and faceting","description":"Implements filtering and faceting capabilities that allow users to narrow API search results by predefined categories (weather, finance, geolocation, etc.) and other metadata attributes. The system supports multi-facet filtering (e.g., 'free APIs in the finance category that require no authentication') by applying boolean logic across indexed metadata fields. Faceting enables users to explore the API landscape by discovering available categories and result counts per category.","intents":["Filter APIs by category to find domain-specific solutions","Narrow results by authentication requirements (none, API key, OAuth)","Discover what API categories are available in the database"],"best_for":["Users exploring unfamiliar API landscapes and need guided discovery","Developers building filtered API recommendation systems","Teams standardizing on specific API categories for their tech stack"],"limitations":["Filtering is limited to pre-defined categories and metadata fields — cannot filter by custom attributes","No fuzzy or semantic filtering — exact matches only for category names","Facet counts may be stale if database is not frequently updated","No support for complex boolean queries (AND/OR/NOT combinations)"],"requires":["Indexed metadata with category and attribute fields","Filtering logic that supports multi-field predicates","Pre-computed facet counts or on-demand facet aggregation"],"input_types":["filter parameters (category, authentication type, etc.)"],"output_types":["filtered API result set","facet metadata (available categories, result counts)"],"categories":["search-retrieval","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-public-apis-mcp__cap_4","uri":"capability://data.processing.analysis.api.metadata.standardization.and.normalization","name":"api metadata standardization and normalization","description":"Normalizes heterogeneous API documentation into a consistent metadata schema (name, description, base URL, authentication type, rate limits, response formats, categories). The system applies transformation logic to extract and standardize fields from diverse API documentation sources, ensuring uniform representation across the catalog. This enables reliable filtering, comparison, and presentation of APIs despite variations in how different API providers document their services.","intents":["Get consistent metadata format for all APIs regardless of how they document themselves","Compare APIs side-by-side using normalized attributes","Build tools that rely on consistent API metadata structure"],"best_for":["API aggregation platforms that need to normalize data from multiple sources","Teams building API comparison or recommendation engines","Developers creating API client code generators that need standardized metadata"],"limitations":["Normalization may lose nuanced information from original documentation","Requires manual mapping of non-standard API attributes to the schema","Schema may not capture all relevant metadata for specialized API types","Updates to the schema require re-processing of the entire database"],"requires":["Source API documentation (JSON, HTML, OpenAPI specs, or manual curation)","Transformation/mapping logic to extract and normalize fields","Schema definition for the normalized metadata format","Validation logic to ensure all required fields are present"],"input_types":["raw API documentation in various formats"],"output_types":["normalized JSON metadata with consistent schema"],"categories":["data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":27,"verified":false,"data_access_risk":"high","permissions":["MCP client implementation (Claude Desktop, LLM framework with MCP support)","Network access to fetch API database (if remote-hosted) or local database file","Understanding of MCP tool schema to properly invoke search parameters","MCP server implementation (Node.js, Python, or compatible runtime)","MCP client that supports tool calling (Claude Desktop 0.5+, LangChain MCP integration)","JSON schema validation library for input parameter validation","Pre-built API database file (JSON, SQLite, or similar)","Indexing mechanism (in-memory hash map, full-text search engine, or database query layer)","Periodic maintenance process to update API metadata","Indexed metadata with category and attribute fields"],"failure_modes":["Search results limited to pre-indexed public APIs in the database — cannot discover newly launched or unlisted APIs","No real-time API health checking or uptime validation — results may include deprecated or unstable endpoints","Search ranking is basic keyword/category matching without semantic understanding of API capabilities","No filtering by response time, availability SLA, or data freshness guarantees","Tool invocation latency depends on MCP transport layer (stdio, HTTP) — adds 50-200ms per call","No built-in caching of search results — repeated queries re-execute database lookups","Tool schema must be manually updated if API database structure changes","Limited to MCP-compatible clients — cannot be used with non-MCP LLM APIs","Database is static and requires manual updates — may lag behind new API releases by weeks or months","Metadata accuracy depends on manual curation — no automated validation that endpoints still work","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.2,"ecosystem":0.3,"match_graph":0.25,"freshness":0.9,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:21.011Z","last_scraped_at":"2026-05-03T14:00:15.503Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=public-apis-mcp","compare_url":"https://unfragile.ai/compare?artifact=public-apis-mcp"}},"signature":"Sx/npZbWouAolsNzkQ6Uz9WQ/8eRBid+JcXEmMBDmmTWaNlWVo2+mLrgIPbODxAfj5HnFPDj7sWJl6sbCho+Dg==","signedAt":"2026-06-15T21:24:54.938Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/public-apis-mcp","artifact":"https://unfragile.ai/public-apis-mcp","verify":"https://unfragile.ai/api/v1/verify?slug=public-apis-mcp","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}