Marqo
Marqo is an open-source, multimodal vector search engine that lets developers index text and images, generate embeddings on the fly, and run tensor, lexical, and hybrid search through a single REST API. Built on Vespa for storage and retrieval and FastAPI for the HTTP surface, Marqo bundles model inference (Sentence Transformers, OpenCLIP, ONNX) inside the engine so a single `docker run` produces a working semantic search stack. The Apache 2.0 open-source engine has been marked deprecated by the maintainers as Marqo pivots to a hosted ecommerce search product, but the project remains widely forked, downloaded, and self-hosted, with active sibling repositories for the Python client, Terraform provider, InstantSearch client, ecommerce embedding models, and Generalised Contrastive Learning research.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Marqo the way a machine reads it — 41 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Marqo scores 39.4/100 (thin), with a separate agent-readiness read of 55/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Marqo
Each block below is one kind of artifact we hold for Marqo. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 7
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Marqo Documents API
Add, update, get, and delete documents in an index.
Marqo Embeddings API
Generate embedding vectors using engine-loaded models.
Marqo Indexes API
Create, list, inspect, and delete tensor / lexical indexes.
Marqo Models API
Inspect, load, and eject embedding models from the engine.
Marqo Recommendations API
Return documents similar to one or more reference documents.
Marqo Search API
Tensor, lexical, and hybrid search across an index.
Marqo Telemetry API
Health, readiness, and engine-level metadata.
Scroll within the panel for all 7 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Marqo REST API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Marqo Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Marqo Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Marqo Finops
FINOPSFeatures 12
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 12 ·
Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Multimodal Semantic Search
Index text and images into a single tensor store and query with natural-language or image inputs, with embedding inference running inside the engine.
Retrieval-Augmented Generation
Power RAG pipelines by serving the nearest-neighbor retrieval layer for LLM context windows over private corpora.
Ecommerce Product Discovery
Drive product search, recommendations, and merchandising-aware ranking using semantic relevance plus structured filters and boosts.
Visual Search
Search product catalogs and image libraries using image-to-image and text-to-image similarity through OpenCLIP / Marqo-FashionCLIP.
Self-Hosted Vector Backend
Stand up an Apache 2.0 vector search service alongside your application stack with `docker run`, no separate embedding service required.
Integrations 10
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Vespa
Vespa is the underlying storage and retrieval engine that backs every Marqo index.
Sentence Transformers
Default text embedding model family loaded by the engine for tensor search.
OpenCLIP
Multimodal text-and-image embedding family used for visual and cross-modal search.
Hugging Face
Models are pulled from Hugging Face hubs at first use unless preloaded.
NVIDIA Triton
`compose-triton.yaml` ships a Triton-backed model server profile for GPU inference.
Terraform
terraform-provider-marqo manages Marqo Cloud indexes as infrastructure-as-code.
Algolia InstantSearch
marqo-instantsearch-client adapts Marqo to the InstantSearch.js front-end conventions.
Shopify
Hosted Marqo product offers one-click integration for Shopify catalogs.
Adobe Commerce
Hosted Marqo product offers Adobe Commerce / Magento connector.
Salesforce Commerce Cloud
Hosted Marqo product offers Salesforce Commerce Cloud connector.
Scroll within the panel for all 10 ·
Resources
Every other property we hold for Marqo — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 8
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 8 ·
Access & Security 2
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 1
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 3
Properties that don't map to a standard resource type
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