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

39.5/100 developing ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumSelf serve⚡ Free to try

4 APIs

Artificial Intelligence LLM Web SearchGroundingRAG

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 39.5/100 · developing

Contract Quality 13.4 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 9.5 / 20

Operational Transparency 4.4 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 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 Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 4

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

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.

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.
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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Linkup

Kin Score

APIs 4

Linkup Credits API

Linkup Fetch API

Linkup Research API

Linkup Search API

Open Collections 6

API Collection

Linkup Credits API

Linkup Credits Fetch API

Linkup Credits Research API

Linkup Credits Search API

Linkup API

Pricing Plans 1

Linkup So Plans Pricing

Rate Limits 1

Linkup So Rate Limits

FinOps 1

Linkup So Finops

Security Posture 3

Linkup So Authentication

Linkup So Domain Security

Linkup So Trust Center

Agentic Access 1

Linkup So Agentic Access

Resources