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API Knowledge

API knowledge is the layer of indexes, descriptions, contexts, and signals that lets humans and agents reason about which APIs exist, what they do, who operates them, what they cost, how to call them, and how trustworthy they are. This topic repo catalogs the formats and platforms that publish API knowledge — APIs.json as a sitemap for an API project, APIs.guru as the community OpenAPI directory, RapidAPI Hub and the Postman Public API Network as commercial discovery surfaces, the OpenAPI Initiative as the spec authority, Jentic and Composio as agent-facing knowledge layers, llms.txt as a site-level guide for LLMs, schema.org/WebAPI as the structured-data vocabulary. Together they form a multi-source view of the API knowledge an AI agent needs to do real work against the API economy.

118 related providers on APIs.io 9 resources Source repository →

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Providers working in API Knowledge

Providers whose own tags share at least two of this topic's tags, most shared first — the top 30 of 118.

ProviderAboutRatingAPIs
WebCrawlerAPI WebCrawlerAPI is a web crawling and scraping API from 103 Labs (Netherlands) that turns websites into clean, LLM-ready markdown, cleaned text, HTML or link lists for AI agents, support bots and RAG pipelines. It offers asynchronous multi-p… strong 2
Cognee Cognee is an open-source AI memory and knowledge graph platform that enables developers to build persistent, structured memory for AI agents and LLM applications. The platform provides a REST API and Python/TypeScript SDKs for ingesting do… developing 1
H2O.ai H2O.ai is an open-source artificial-intelligence and machine-learning company whose platform spans H2O-3 (a distributed, in-memory ML engine), H2O Driverless AI (automatic machine learning), H2O MLOps (model deployment, scoring and monitor… developing 2
Zep Zep is a context engineering and agent memory platform that assembles relevant context from chat history, business data, and user interactions for AI agents. It builds a temporal knowledge graph per user that evolves as new facts arrive, a… developing 1
Julep Julep is an open-source platform for building stateful AI agents that remember past interactions and execute long-running, multi-step tasks. Its cloud API and self-hostable server expose agents, sessions, tasks, executions, documents (RAG)… thin 1
Docling Docling is an open-source toolkit for parsing diverse document formats — PDF, DOCX, PPTX, XLSX, HTML, images, audio, LaTeX, plain text — into a unified, lossless DoclingDocument representation that downstream generative AI and RAG systems… thin 2
Eder Labs Eder Labs builds infrastructure for using personal data in safer, more human ways. Its current focus is Persona, an open-source (MIT) user-memory system for AI agents that turns a person's digital footprint into a Graph-Vector hybrid perso… thin 1
Superduper Superduper (formerly SuperDuperDB) is an open-source Python framework for building database-integrated AI agents and applications directly on top of existing databases - MongoDB, SQL databases, Snowflake, and Redis - without separate vecto… emerging 6
Miriel Miriel is the context engine and platform for AI-native development. It gives AI apps and agents the context they need in real time through a simple API: developers connect a data source with the learn operation and retrieve relevant conte… emerging 7
RDF The Resource Description Framework (RDF) is a W3C standard for representing information about resources on the web. RDF is the foundation for linked data and the semantic web, providing a graph-based data model where statements are express… emerging 0
Naboo Naboo is Reasoning Layer infrastructure for enterprise AI agents, built on a Decision Graph that models how a company actually decides, ships, and unblocks - who decided what, what triggered each decision, what blocks it, and what depends… emerging 0
APIs.io APIs.io is an open-source API search engine and federated discovery network built on the APIs.json specification. It indexes API providers and their individual APIs across the public internet along with the machine-readable artifacts they… exemplar 20
Arcade Arcade.dev is the MCP runtime for production AI agent deployments. The Arcade Engine — a hosted or self-hostable API surface — handles OAuth user authorization, manages user tokens, and exposes 7,000+ pre-built integrations as Model Contex… exemplar 4
Dust Dust is a Paris-based enterprise AI platform for building, deploying, and operating teams of AI agents that have shared context across a company's knowledge and tools. Dust positions itself as the platform for "AI Operators" — the people w… exemplar 9
AlphaAI A REST API and agent-native platform for relevance-scored, ticker-linked financial news, built for trading bots, agent backends, and dashboards. Every article is enriched at ingest with a 1-10 relevance score, one of fourteen categories, v… exemplar 1
Seekr Seekr Technologies builds explainable, auditable, sovereign AI for regulated industries and high-stakes government missions. Its platform, SeekrFlow, is an end-to-end AI operating system that covers document ingestion and AI-ready data pre… exemplar 8
Compresr Compresr is an LLM context-compression API. You send the long context you would otherwise pass to a model plus the query you want answered, and Compresr returns a shorter context that keeps the answer-bearing spans and drops the rest — few… strong 1
Airia Airia (Airia LLC, Atlanta) is an enterprise AI orchestration, security and governance platform: a no-code/low-code/pro-code agent builder, a model routing and cost gateway, an MCP Gateway that fronts 1,000+ app connectors and turns hosted… strong 2
Wikidata Wikidata is a free, collaborative, multilingual knowledge graph hosted by the Wikimedia Foundation. It provides structured linked data for Wikipedia and other Wikimedia projects, as well as a public platform for anyone to read and edit. Wi… strong 1
LlamaParse LlamaParse is an enterprise document parsing and AI pipeline platform from LlamaIndex that converts complex PDFs, Office files, and 130+ document formats into LLM-ready structured outputs. The platform offers six composable products under… strong 1
gpt55-token-gateway gpt55-token-gateway is the self-chosen service name of an unnamed operator running two OpenAI-compatible AI API gateways on the 558686.xyz domain. GPT55 Model Gateway (gpt55.558686.xyz) sells single GPT-5.6 Luna, GPT-5.5 and GPT-5.3-codex… strong 5
Mem0 Mem0 is a memory infrastructure layer that gives AI agents and applications persistent context across sessions. The platform automatically condenses chat history into compact memories that reduce tokens and latency while preserving the rig… strong 1
Gumloop Gumloop is an AI-agent automation platform for building, deploying, and governing agents that automate real work — data analysis, customer support, CRM management, and back-office tasks — across tools like Slack, Microsoft Teams, and Gmail… strong 1
Orthogonal Orthogonal is a unified API and payment layer for AI agents, backed by Pantera Capital and Y Combinator. An agent describes what it needs in natural language and Orthogonal returns the right service from a catalog of 40+ third-party APIs (… strong 2
Amazon Bedrock Amazon Bedrock is a fully managed AWS service that makes high-performing foundation models from leading AI companies available through a unified API for building generative AI applications. It supports text and image generation, conversati… strong 2
Space Frontiers Space Frontiers is a Wyoming corporation whose search and AI product, Machine Library (formerly Space Frontiers search, moved to machinelibrary.ai on 2026-09-12), is a full-text retrieval API and hosted MCP server over a corpus of roughly… strong 2
Vectara Vectara is a Retrieval Augmented Generation (RAG) as a service platform that provides grounded generative AI for enterprises. The API-first platform exposes a unified REST API v2 for managing corpora, ingesting documents, performing semant… strong 1
Meta Agent Tools A registry/catalog of MCP servers, agent skills and plugins. It aggregates MCP metadata from the Official MCP Registry, Smithery and Casdoor, and public skill dumps, exposing a REST/HTTP API, a hosted MCP server, an llms.txt agent guide an… developing 1
Quadrillion Quadrillion Labs builds Qualia, an AI coding agent for researchers that runs hundreds of agents in parallel to compress weeks of research into hours. Qualia is a Jupyter-compatible notebook IDE with autonomous mode, a central knowledge gra… developing 1
Toolhouse Toolhouse is a Backend-as-a-Service platform for building, deploying, and managing "AI workers" (Toolhouse's current product noun, used interchangeably with "AI agents"). The homepage frames the value proposition as "Turn your AI chats int… developing 1

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API KnowledgeKnowledge GraphAPI DiscoveryAPI SearchCatalogIndexRegistriesRAGSemantic WebJSON-LDLLMAI AgentsTopic