RAG
Variants seen in the corpus:
Retrieval Augmented GenerationRAG
Providers using this tag (93)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 3 Complete, well-documented, and agent-ready
Strong 13 Solid coverage with minor gaps
Developing 33 Usable, with meaningful gaps to close
Thin 30 Limited public surface area
Emerging 10 Early or largely undocumented
Minimal 4 Almost no public developer surface
APIs with this tag (45)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Exemplar 5 Complete, well-documented, and agent-ready
Cloudflare AI Search APIThe Cloudflare AI Search API provides fully managed retrieval-augmented generation (RAG) pipelines. Develop...Dify Chunks APIOperations for managing document chunks and child chunks. 9 operation(s) from the Dify Service API.Auth0 for AI AgentsIdentity and authorization product line for AI agents. Bundles Token Vault (delegated API credentials for G...NVIDIA NIM Embeddings APIOpenAI-compatible embeddings endpoint (/v1/embeddings) backed by NVIDIA NeMo Retriever text embedding model...NVIDIA NIM Reranking APINeMo Retriever cross-encoder reranking endpoint (/v1/ranking) for scoring candidate passages against a quer...
Strong 8 Solid coverage with minor gaps
Gravitee AI Agent ManagementGravitee AI Agent Management brings the API management discipline to agentic AI ecosystems. It is delivered...Vector Search Indexes APIManage vector search indexes for similarity search and retrieval-augmented generation workloads.Fenergo Rag APIThe Rag API from Fenergo — 2 operation(s) for rag.Feedly Rag APIThe Rag API from Feedly — 1 operation(s) for rag.LlamaCloud Index APIManaged vector index API for ingesting parsed documents into searchable LlamaCloud indexes. Supports standa...Amazon Bedrock Agent APIThe Amazon Bedrock Agent API provides operations for managing and configuring autonomous AI agents, knowled...Amazon Bedrock Agent Runtime APIThe Amazon Bedrock Agent Runtime API provides operations for invoking Bedrock agents and retrieving content...Vectara Chat APIMulti-turn conversational interface over a Vectara corpus that maintains chat history and produces grounded...
Developing 14 Usable, with meaningful gaps to close
Factiva Retrieval APIProvides retrieval functionality that returns licensed news articles as part of trusted data sources in a r...Elium MCP ServerA remote Model Context Protocol server, announced 3 June 2026, served per tenant at https://{platform}.eliu...APIClaw Rag APIThe rag API from APIClaw — 4 operation(s) for rag.Gemini Embeddings APIText embedding capabilities through the Gemini API, generating vector representations for semantic search, ...StepFun Vector Stores APIKnowledge-base (vector store) management — create/list/retrieve/delete stores and attach or remove files fo...RAGFlow HTTP APIThe RAGFlow RESTful HTTP API — 95 documented operations under /api/v1, authenticated with a tenant API key ...University of Amsterdam Rag APIThe rag API from University of Amsterdam — 4 operation(s) for rag.Trieve Message APIMessages are turns within a topic; the Message API drives RAG completions, streaming responses, and citatio...Trieve Topic APITopics persist conversational state for generative-AI chat sessions backed by a Trieve dataset.Voyant.io Rag APIThe Rag API from Voyant.io — 7 operation(s) for rag.NationGraph RAG APIThe RAG API from NationGraph — 3 operation(s) for rag.TopK Dataset APIUnstructured document ingestion, semantic search, and grounded question answering. Upload document files (P...AI21 File Library APIManaged file storage for RAG workflows. Upload, list, retrieve, update, and delete documents that Maestro a...Arcee AI RAG APIThe RAG API from Arcee AI — 9 operation(s) for rag.
Thin 12 Limited public surface area
Docling GraphTransform unstructured documents — once normalized to `DoclingDocument` — into validated, rich, queryable k...Docling LangChain IntegrationFirst-party LangChain document loader and chunker for Docling. Drops Docling output directly into LangChain...AI RAG Injector PluginAutomates retrieval-augmented generation by injecting retrieved context into prompts at the gateway, so app...LiteLLM Rag APIThe Rag API from LiteLLM — 2 operation(s) for rag.LiteLLM Vector Stores APIProvides /vector_stores endpoints for creating and managing vector stores, file operations within vector st...Tonic ValidateTonic Validate is an open-source RAG evaluation framework and metrics platform for measuring retrieval-augm...LlamaIndex Python FrameworkLlamaIndex is an open-source Python framework for building LLM-powered applications including agents, RAG p...LlamaIndex TypeScript FrameworkLlamaIndex TypeScript is the JavaScript and TypeScript implementation of the LlamaIndex framework for build...Voyage AI Contextualized Embeddings APIEndpoint that embeds chunks while conditioning on surrounding document context, improving recall for long-d...Voyage AI Rerank APIReranking endpoint that scores a list of candidate documents against a query and returns relevance scores. ...Glean Chat APIMulti-turn generative chat over enterprise content with grounded answers, citations, and tool use.Open WebUI APIREST API exposed by a self-hosted Open WebUI instance. Endpoints cover chat completions (proxying upstream ...
Emerging 6 Early or largely undocumented
OpenLLMetry Vector Database InstrumentationsInstrumentations for vector databases used in retrieval-augmented generation pipelines — Chroma, Pinecone, ...Ragas Python LibraryThe Ragas Python library is the primary surface of the project, installed via `pip install ragas` and impor...KAITO RAGEngine APIRAGEngine exposes endpoints for managing retrieval-augmented generation services with embedded vector datab...DeepEval (Confident AI)DeepEval is an open-source LLM evaluation package, paired with Confident AI as the hosted observability/eva...GalileoGalileo is an enterprise AI observability and evaluation engineering platform. The product line emphasizes ...RagasRagas is an open-source evaluation library focused on retrieval-augmented generation, described in its own ...
Companies reaching this through an API (19)
These companies publish an API, specification or operation carrying “RAG” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.
APIClaw
Arcee AI
Auth0
Azure Databricks
Cloudflare
Evals
Factiva
Feedly
Fenergo
Gemini
Gravitee
Kong AI Gateway
LiteLLM
NationGraph
NVIDIA NIM
OpenLLMetry
StepFun
Tonic.ai
University of Amsterdam
Score breakdown
Frequency
59.5
log-scaled weighted occurrences
Breadth
2.4
spread across providers
Quality lift
49.3
mean composite of providers using it
Cohesion
12.8
strength of nearest seed neighbor
Where this tag sits
Related tags
Retrieval 24 co-occurrences
Vector Search 21 co-occurrences
Embeddings 23 co-occurrences
Vector Database 13 co-occurrences
LLM 43 co-occurrences
Tools 14 co-occurrences
Enterprise Search 8 co-occurrences
Chat 20 co-occurrences
Where this tag comes from
Provider tag93
Api tag46
Openapi tag8
Openapi op tag37
Cohort brief
Auto-generatedThe 92 providers in the APIs.io catalog tagged RAG, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
92
all scored
Mean Kin Score
40.6
+17.7 vs catalog 22.9
Mean Agent Readiness
25.1
+13.2 vs catalog 11.9
Spread
6.3–75.3
median 40.4 · σ 14.2
How the 92 split by band
Exemplar 3Strong 13Developing 33Thin 30Emerging 10Minimal 3
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 40.7 | 17.6 | +23.1 | 92 |
| Operational Transparency | 33.2 | 13.7 | +19.5 | 92 |
| Developer Ergonomics | 42.4 | 23.2 | +19.2 | 92 |
| Access Clarity | 41.2 | 26.5 | +14.7 | 92 |
| Discoverability | 67.6 | 58.1 | +9.5 | 92 |
| Contract Governance | 9.4 | 6.3 | +3.1 | 92 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 30% | 14% | +16 |
| MCP server (first-party) | 30% | 12% | +18 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 13% | 11% | +2 |
| Security | 98% | 98% | 0 |
| Arazzo workflows | 2% | 2% | 0 |
| Governance rules | 27% | 14% | +13 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Dify 75.3
- 2 Dust 73
- 3 TranscriptFetch 67.6
- 4 Space Frontiers 65.5
- 5 Nexla 64.7
- 6 WebCrawlerAPI 64.5
- 7 Airia 63.5
- 8 Seekr 63
- 9 Compresr 61
- 10 LlamaParse 56.7
Top by Agent Readiness
- 1 Space Frontiers 65.7
- 2 Airweave 60.2
- 3 TranscriptFetch 58.1
- 4 LinqAlpha 54.5
- 5 Mixedbread 52.1
- 6 Airia 48.8
- 7 OpenLaws 47.4
- 8 Seltz 46.9
- 9 WikiKV 45.7
- 10 kapa.ai 44.6
All 93 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
5 October 2026, across 29093
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.