Linkup

Linkup is a production-grade web search and answer API for AI agents and LLMs. Its /search endpoint grounds model responses in real-time web context, returning ranked results, sourced answers with citations, or structured output, plus /fetch for clean LLM-ready markdown, an async /research endpoint, and a credits balance endpoint - all authenticated with a Bearer API key.

Linkup publishes 4 APIs on the APIs.io network, including Credits API, Fetch API, Research API, and 1 more. Tagged areas include Artificial Intelligence, LLM, Web Search, Grounding, and RAG.

Linkup’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.7/100 developing ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Artificial Intelligence LLM Web SearchGroundingRAG

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 39.7/100 · developing

Contract Quality 12.1 / 23

Developer Ergonomics 5.6 / 18

Access Clarity 8.5 / 18

Operational Transparency 4.0 / 12

Contract Governance 0.0 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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 github.com/api-evangelist/linkup-so: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 4

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

Linkup Credits API

The Credits API from Linkup — 1 operation(s) for credits.

Linkup Fetch API

The Fetch API from Linkup — 1 operation(s) for fetch.

Linkup Research API

The Research API from Linkup — 2 operation(s) for research.

Linkup Search API

The Search API from Linkup — 1 operation(s) for search.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Linkup Credits API

OPEN COLLECTION

Linkup Credits Fetch API

OPEN COLLECTION

Linkup Credits Research API

OPEN COLLECTION

Linkup Credits Search API

OPEN COLLECTION

Linkup API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Linkup So Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Linkup So Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Linkup So Finops

FINOPS

Security Posture 3

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

Linkup So Authentication

http · 1 scheme

SECURITY

Linkup So Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Linkup So Trust Center

SOC 2

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Linkup So Agentic Access

5 operations · 3 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: linkup-so
url: https://raw.githubusercontent.com/api-evangelist/linkup-so/refs/heads/main/apis.yml
name: Linkup
kind: company
description: Linkup is a production-grade web search and answer API for AI agents and LLMs. Its /search endpoint grounds model
  responses in real-time web context, returning ranked results, sourced answers with citations, or structured output, plus
  /fetch for clean LLM-ready markdown, an async /research endpoint, and a credits balance endpoint - all authenticated with
  a Bearer API key.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/linkup-so.png
tags:
- Artificial Intelligence
- LLM
- Web Search
- Grounding
- RAG
tags_raw:
- AI
- LLM
- Web Search
- Grounding
- RAG
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.23'
apis:
- aid: linkup-so:linkup-so-credits-api
  name: Linkup Credits API
  description: The Credits API from Linkup — 1 operation(s) for credits.
  humanURL: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  baseURL: https://api.linkup.so/v1
  tags:
  - Credits
  properties:
  - type: OpenAPI
    url: openapi/linkup-so-credits-api-openapi.yml
  - type: Documentation
    url: https://docs.linkup.so/pages/documentation/get-started/introduction
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-fetch
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/get-balance
- aid: linkup-so:linkup-so-fetch-api
  name: Linkup Fetch API
  description: The Fetch API from Linkup — 1 operation(s) for fetch.
  humanURL: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  baseURL: https://api.linkup.so/v1
  tags:
  - Fetch
  properties:
  - type: OpenAPI
    url: openapi/linkup-so-fetch-api-openapi.yml
  - type: Documentation
    url: https://docs.linkup.so/pages/documentation/get-started/introduction
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-fetch
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/get-balance
- aid: linkup-so:linkup-so-research-api
  name: Linkup Research API
  description: The Research API from Linkup — 2 operation(s) for research.
  humanURL: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  baseURL: https://api.linkup.so/v1
  tags:
  - Research
  properties:
  - type: OpenAPI
    url: openapi/linkup-so-research-api-openapi.yml
  - type: Documentation
    url: https://docs.linkup.so/pages/documentation/get-started/introduction
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-fetch
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/get-balance
- aid: linkup-so:linkup-so-search-api
  name: Linkup Search API
  description: The Search API from Linkup — 1 operation(s) for search.
  humanURL: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  baseURL: https://api.linkup.so/v1
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/linkup-so-search-api-openapi.yml
  - type: Documentation
    url: https://docs.linkup.so/pages/documentation/get-started/introduction
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-search
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/post-fetch
  - type: APIReference
    url: https://docs.linkup.so/pages/documentation/api-reference/endpoint/get-balance
common:
- type: AgenticAccess
  url: agentic-access/linkup-so-agentic-access.yml
- type: TrustCenter
  url: security/linkup-so-trust-center.yml
- type: DomainSecurity
  url: security/linkup-so-domain-security.yml
- type: Authentication
  url: authentication/linkup-so-authentication.yml
- type: GitHubOrganization
  url: https://github.com/LinkupPlatform
- type: LinkedIn
  url: https://www.linkedin.com/company/linkup-platform
- type: Website
  url: https://www.linkup.so
- type: Documentation
  url: https://docs.linkup.so
- type: Plans
  url: plans/linkup-so-plans-pricing.yml
- type: RateLimits
  url: rate-limits/linkup-so-rate-limits.yml
- type: Blog
  url: https://www.linkup.so/blog
- type: FinOps
  url: finops/linkup-so-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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