Topk

TopK is a search engine for accuracy-critical AI applications, delivering hybrid search, multi-vector (late-interaction) retrieval, dense and sparse vector search, BM25 keyword search, custom ranking, document parsing, and grounded question answering through a single API. Built on object storage for roughly 10x lower cost and effectively unlimited scale, TopK exposes a Collection API for structured document storage and querying, a Dataset API for unstructured document ingestion, semantic search, and evidence-backed answers, and a Management API for datasets and collections. It ships official Python, JavaScript, Rust, and SQL (PostgreSQL-wire) SDKs, a Homebrew-installable CLI, and a hosted MCP server so AI agents can query private data with natural language. TopK is developed by topk-io and is a portfolio company of Earlybird.

Topk is listed with 3 APIs on the APIs.io network. Tagged areas include Company, Search, Vector Search, Hybrid Search, and Multi-Vector Retrieval.

Topk’s developer surface includes documentation, API reference, getting-started guide, engineering blog, pricing, signup flow, CLI, and 26 more developer resources.

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51.0/100 developing ▬ flat Agent 7/100 agent aware Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

3 APIs 1 MCP Servers 2 Agent Skills

Company Search Vector Search Hybrid SearchMulti-Vector RetrievalSemantic Search BM25 Retrieval RAG Question Answering AI Infrastructure Embeddings MCP

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 51.0/100 · developing

Contract Quality 0.0 / 21

Developer Ergonomics 11.6 / 17

Access Clarity 15.9 / 17

Operational Transparency 4.9 / 11

Contract Governance 1.9 / 10

Discoverability 6.8 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 7/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Operational Transparency scores 44.7 — up to +7.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/topk/apis.yml: open an issue on github.com/api-evangelist/topk to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Hugging Face Hub Organisations	builds-on	26.8 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

TopK Collection API

Structured document store and query surface. Create collections with typed, indexed fields (keyword_index, semantic_index, vector index), upsert/update/delete documents by `_id`...

TopK Dataset API

Unstructured document ingestion, semantic search, and grounded question answering. Upload document files (PDF, Markdown, HTML, and more) to a dataset, retrieve the most relevant...

TopK Management API

Create, list, get, update, and delete datasets and collections that back TopK search and retrieval.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Topk MCP Server

TopK ships an official hosted, remote MCP server that lets any MCP-compatible AI agent query private datasets using natural language. It is region-scoped (one HTTP endpoint per ...

MCP SERVER

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Ingest documents and get grounded answers (RAG)

AGENT SKILL

Build a collection and run hybrid search

AGENT SKILL

Topk API pricing

Prices published by Topk, read 2026-10-28 from www.topk.io/pricing.

Plan	Price
Storage	$0.10 per GiB / month
Write requests	$0.01 per 1K requests
Write data	$0.50 per GiB written
Query requests	$0.50 per 1M queries
Query memory	$20.00 per GiB / month
Query compute	$0.005 per TiB scanned
Data egress	$0.20 per GiB returned
Get operations	$0.01 per 1K gets

All 10 plans, limits and sources →

Billed by: gib / month · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Topk Plans Pricing

10 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Topk

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Topk Finops

FINOPS

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Topk Authentication

http · 1 scheme

SECURITY

Topk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Topk Vulnerability Disclosure

security.txt · contact published

SECURITY

Topk Trust Center

SOC 2

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

DataModel

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 7

Authentication, authorization, and security posture

Compliance

TrustCenter

Security

SecurityTxt

Authentication

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: topk
name: Topk
description: TopK is a search engine for accuracy-critical AI applications, delivering hybrid search, multi-vector (late-interaction)
  retrieval, dense and sparse vector search, BM25 keyword search, custom ranking, document parsing, and grounded question
  answering through a single API. Built on object storage for roughly 10x lower cost and effectively unlimited scale, TopK
  exposes a Collection API for structured document storage and querying, a Dataset API for unstructured document ingestion,
  semantic search, and evidence-backed answers, and a Management API for datasets and collections. It ships official Python,
  JavaScript, Rust, and SQL (PostgreSQL-wire) SDKs, a Homebrew-installable CLI, and a hosted MCP server so AI agents can query
  private data with natural language. TopK is developed by topk-io and is a portfolio company of Earlybird.
url: https://raw.githubusercontent.com/api-evangelist/topk/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- earlybird
x-tier: stub
x-tier-reason: portfolio-lead
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: vercel
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/topk.png
tags:
- Company
- Search
- Vector Search
- Hybrid Search
- Multi-Vector Retrieval
- Semantic Search
- BM25
- Retrieval
- RAG
- Question Answering
- AI Infrastructure
- Embeddings
- MCP
apis:
- aid: topk:collection-api
  name: TopK Collection API
  description: Structured document store and query surface. Create collections with typed, indexed fields (keyword_index,
    semantic_index, vector index), upsert/update/delete documents by `_id`, and run hybrid queries that combine dense vector,
    multi-vector, sparse vector, BM25 keyword search, and metadata filtering in a single request.
  humanURL: https://docs.topk.io/collections/query
  baseURL: https://elastica.api.topk.io
  tags:
  - Collection
  - Query
  - Hybrid Search
  - Documents
  tags_raw:
  - Collections
  - Query
  - Hybrid Search
  - Documents
  properties:
  - type: Documentation
    url: https://docs.topk.io/collections/query
  - type: APIReference
    url: https://docs.topk.io/sdk/topk-py
- aid: topk:dataset-api
  name: TopK Dataset API
  description: Unstructured document ingestion, semantic search, and grounded question answering. Upload document files (PDF,
    Markdown, HTML, and more) to a dataset, retrieve the most relevant passages, and get evidence-backed answers with citations.
  humanURL: https://docs.topk.io/datasets/search
  baseURL: https://elastica.api.topk.io
  tags:
  - Datasets
  - Ingest
  - Ask
  - RAG
  properties:
  - type: Documentation
    url: https://docs.topk.io/datasets/search
- aid: topk:management-api
  name: TopK Management API
  description: Create, list, get, update, and delete datasets and collections that back TopK search and retrieval.
  humanURL: https://docs.topk.io/collections/manage
  baseURL: https://elastica.api.topk.io
  tags:
  - Management
  - Collection
  - Datasets
  tags_raw:
  - Management
  - Collections
  - Datasets
  properties:
  - type: Documentation
    url: https://docs.topk.io/collections/manage
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/topk-plans-pricing.yml
- type: Website
  url: https://www.topk.io/
- type: DeveloperPortal
  url: https://docs.topk.io
- type: Documentation
  url: https://docs.topk.io
- type: APIReference
  url: https://docs.topk.io/sdk/topk-py
- type: GettingStarted
  url: https://docs.topk.io/introduction
- type: Blog
  url: https://www.topk.io/blog
- type: GitHubOrganization
  url: https://github.com/topk-io
- type: Pricing
  url: https://www.topk.io/pricing
- type: SignUp
  url: https://console.topk.io
- type: Login
  url: https://console.topk.io
- type: StatusPage
  url: https://status.topk.io
- type: TermsOfService
  url: https://topk.io/terms-of-service
- type: PrivacyPolicy
  url: https://topk.io/privacy-policy
- type: Compliance
  url: https://trust.topk.io
- type: TrustCenter
  url: security/topk-trust-center.yml
- type: Security
  url: https://topk.io/security
- type: Packages
  url: packages/topk-packages.yml
- type: SDKs
  url: packages/topk-packages.yml
- type: CLI
  url: cli/topk-cli.yml
- type: MCPServer
  url: mcp/topk-mcp.yml
- type: LLMsTxt
  url: llms/topk-llms.txt
- type: WellKnown
  url: well-known/topk-well-known.yml
- type: SecurityTxt
  url: well-known/topk-security.txt
- type: Authentication
  url: authentication/topk-authentication.yml
- type: Lifecycle
  url: lifecycle/topk-lifecycle.yml
- type: ChangeLog
  url: changelog/topk-changelog.yml
- type: Conventions
  url: conventions/topk-conventions.yml
- type: DataModel
  url: data-model/topk-data-model.yml
- type: Conformance
  url: conformance/topk-conformance.yml
- type: DomainSecurity
  url: security/topk-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/topk-vulnerability-disclosure.yml
- type: AgentSkill
  url: skills/_index.yml

Topk API — frequently asked questions

Does Topk have an API?

Yes. APIs.io lists 3 APIs from Topk, including TopK Collection API, TopK Dataset API and TopK Management API.

How do I authenticate with the Topk API?

Topk uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Topk Authentication.

How much does the Topk API cost?

Topk publishes its prices; its Storage plan is $0.10 per GiB / month as of 2026-10-28. APIs.io lists 10 pricing plans for Topk, with each plan's price, limits and inclusions under Pricing on this page.

Does Topk have an MCP server?

Yes. APIs.io lists 1 MCP server for Topk: TopK ships an official hosted, remote MCP server that lets any MCP-compatible AI agent query private datasets using natural language. It is region-scoped (one HTTP endpoint per region) and authenticat

Is the Topk API ready for AI agents?

Topk has a Kin Score of 51.0 out of 100 (developing) and an Agent Readiness score of 6.9 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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