Leadspace

Leadspace is a B2B GTM Data Intelligence Cloud and customer data platform that unifies buyer data, account data, and buying signals into the Leadspace Universal Graph. Its API-first enrichment service resolves partial person and company records into full profiles carrying firmographics (SIC, NAICS, industry, revenue, employee counts), corporate family-tree hierarchy, department sizes, funding and investor history, installed-base and website technology signals, weekly buyer-intent models sourced from Leadspace Intent and Bombora, and persona and predictive fit scores. Leadspace exposes single and bulk enrichment, contact discovery (account expansion), and an intent-only refresh API over a single gateway, alongside Leadspace Studio for segment building and SmartForms for real-time inbound web-form enrichment. As of 2026 Leadspace also ships two self-serve agent-facing products that share one account: Leadspace Sidekick, a Chrome extension overlaying verified contact data and fit scoring on LinkedIn, and Leadspace MCP, a hosted remote Model Context Protocol server that plugs the same data graph into Claude, ChatGPT and any MCP-compatible client with per-user OAuth. It integrates with Salesforce, Marketo, Eloqua, and HubSpot. Leadspace is ISO 27001 certified and SOC 2 Type II audited.

Leadspace publishes 5 APIs on the APIs.io network, including Authorization API, Discovery API, Enrichment API, and 2 more. Tagged areas include MCP, AI Agents, B2B Data, Customer Data Platform, and Data Enrichment.

The Leadspace catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Leadspace’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, changelog, and 36 more developer resources.

🌐 Visit website 📡 Source on GitHub

64.5/100 strong ▬ flat Agent 49/100 agent ready saas Full breakdown ↓
scored 2026-08-30 · rubric v0.17.2

AccessFreemiumSelf serveFree trial⚡ Free to try

3 APIs 1 MCP Servers

MCP AI Agents B2B Data Customer Data Platform Data Enrichment Intent Data Sales IntelligenceAccount-Based MarketingIdentity Resolution Firmographics Lead Scoring Company

Kin Score

Kin Score How this is scored →
scored 2026-08-30 · rubric v0.17.2

Composite quality — 64.5/100 · strong

Contract Quality 17.4 / 25

Developer Ergonomics 11.8 / 20

Access Clarity 17.1 / 20

Operational Transparency 8.6 / 13

Contract Governance 2.2 / 12

Discoverability 7.4 / 10

Agent readiness — 49/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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/leadspace: 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 6

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

MCP Servers 1

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

Rate Limits 1

Documented rate limits and quota policies.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Leadspace Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

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 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

WellKnown

MCPServer

AgentSkill

LLMsTxt

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

ErrorCodes

DataModel

Webhooks

Conformance

Components

Scroll for all 8

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Examples

ToolCrosswalk

Packages

Access & Security 7

Authentication, authorization, and security posture

Authentication

Authentication

Compliance

Compliance

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

OAuthScopes

OAuthScopes

TrustCenter

TrustCenter

Scroll for all 7

Operate 6

Status, limits, changes, and where to get help

Support

StatusPage

Deprecation

ChangeLog

ChangeLogPage

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

Plans

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: leadspace
name: Leadspace
description: 'Leadspace is a B2B GTM Data Intelligence Cloud and customer data platform that unifies buyer data, account data,
  and buying signals into the Leadspace Universal Graph. Its API-first enrichment service resolves partial person and company
  records into full profiles carrying firmographics (SIC, NAICS, industry, revenue, employee counts), corporate family-tree
  hierarchy, department sizes, funding and investor history, installed-base and website technology signals, weekly buyer-intent
  models sourced from Leadspace Intent and Bombora, and persona and predictive fit scores. Leadspace exposes single and bulk
  enrichment, contact discovery (account expansion), and an intent-only refresh API over a single gateway, alongside Leadspace
  Studio for segment building and SmartForms for real-time inbound web-form enrichment. As of 2026 Leadspace also ships two
  self-serve agent-facing products that share one account: Leadspace Sidekick, a Chrome extension overlaying verified contact
  data and fit scoring on LinkedIn, and Leadspace MCP, a hosted remote Model Context Protocol server that plugs the same data
  graph into Claude, ChatGPT and any MCP-compatible client with per-user OAuth. It integrates with Salesforce, Marketo, Eloqua,
  and HubSpot. Leadspace is ISO 27001 certified and SOC 2 Type II audited.'
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: true
  try_now: true
  public: true
  label: Free tier, self-serve signup
  confidence: high
  source:
  - https://www.leadspace.com/solutions/sidekick/pricing
  - https://www.leadspace.com/solutions/leadspace-mcp
  - plans/leadspace-plans-pricing.yml
  generated: '2026-08-13'
  method: searched
  note: 'Upgraded from pricing: unknown on 2026-08-13. Leadspace now publishes list pricing for Sidekick and the MCP server
    — Starter free forever, Solo $49, Pro $89, Enterprise custom — with a free account creatable from a work email and no
    credit card. The enterprise v4 gateway API remains contracted with no published price.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/leadspace.png
url: https://raw.githubusercontent.com/api-evangelist/leadspace/refs/heads/main/apis.yml
type: Index
kind: company
x-type: company
x-source: vc-portfolio
x-backed-by:
- battery-ventures
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- MCP
- AI Agents
- B2B Data
- Customer Data Platform
- Data Enrichment
- Intent Data
- Sales Intelligence
- Account-Based Marketing
- Identity Resolution
- Firmographics
- Lead Scoring
- Company
tags_raw:
- MCP
- AI Agents
- B2B Data
- Customer Data Platform
- Data Enrichment
- Intent Data
- Sales Intelligence
- Account-Based Marketing
- Identity Resolution
- Firmographics
- Lead Scoring
- Company
apis:
- aid: leadspace:leadspace-authorization-api
  name: Leadspace Authorization API
  description: OAuth 2.0 token issuance and refresh
  humanURL: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  baseURL: https://apigw.leadspace.com
  tags:
  - Authorization
  properties:
  - type: OpenAPI
    url: openapi/leadspace-authorization-api-openapi.yml
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  - type: BulkDocumentation
    url: https://support.leadspace.com/hc/en-us/articles/23687991628572-Leadspace-Bulk-API-v4-Technical-Specifications
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360011926619-Leadspace-Discovery-API
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360012583400-Leadspace-Intent-Only-API
- aid: leadspace:leadspace-discovery-api
  name: Leadspace Discovery API
  description: Bulk account expansion into net-new contacts
  humanURL: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  baseURL: https://apigw.leadspace.com
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/leadspace-discovery-api-openapi.yml
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  - type: BulkDocumentation
    url: https://support.leadspace.com/hc/en-us/articles/23687991628572-Leadspace-Bulk-API-v4-Technical-Specifications
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360011926619-Leadspace-Discovery-API
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360012583400-Leadspace-Intent-Only-API
- aid: leadspace:leadspace-enrichment-api
  name: Leadspace Enrichment API
  description: Single and bulk person and company enrichment
  humanURL: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  baseURL: https://apigw.leadspace.com
  tags:
  - Enrichment
  properties:
  - type: OpenAPI
    url: openapi/leadspace-enrichment-api-openapi.yml
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  - type: BulkDocumentation
    url: https://support.leadspace.com/hc/en-us/articles/23687991628572-Leadspace-Bulk-API-v4-Technical-Specifications
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360011926619-Leadspace-Discovery-API
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360012583400-Leadspace-Intent-Only-API
- aid: leadspace:leadspace-intent-api
  name: Leadspace Intent API
  description: Buyer-intent scoring and refresh
  humanURL: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  baseURL: https://apigw.leadspace.com
  tags:
  - Intent
  properties:
  - type: OpenAPI
    url: openapi/leadspace-intent-api-openapi.yml
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  - type: BulkDocumentation
    url: https://support.leadspace.com/hc/en-us/articles/23687991628572-Leadspace-Bulk-API-v4-Technical-Specifications
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360011926619-Leadspace-Discovery-API
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360012583400-Leadspace-Intent-Only-API
- aid: leadspace:leadspace-mcp-server
  name: Leadspace MCP
  description: Hosted remote MCP server exposing the Leadspace GTM Data Intelligence Cloud to AI assistants as a custom connector
    — account intelligence, company and contact lookup, verified email and phone reveal, and buying-intent signals, inside
    Claude, ChatGPT, Claude Code, Codex or any MCP-compatible client. Authenticated per user with OAuth 2.1 (authorization
    code + PKCE, dynamic client registration) against an Auth0 tenant. Lookups are free; reveals and intent are credit-metered.
    A different product, and a different credential, from the v4 gateway API.
  humanURL: https://www.leadspace.com/solutions/leadspace-mcp
  baseURL: https://skprod.leadspace.com/mcp/v1
  tags:
  - MCP
  - Agents
  properties:
  - type: MCPServer
    url: mcp/leadspace-mcp.yml
  - type: ToolCrosswalk
    url: mcp/leadspace-tool-crosswalk.yml
  - type: Documentation
    url: https://www.leadspace.com/solutions/leadspace-mcp
  - type: GettingStarted
    url: https://www.leadspace.com/solutions/leadspace-mcp/claude
  - type: Documentation
    url: https://www.leadspace.com/solutions/leadspace-mcp/chatgpt
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/29196640181020-Leadspace-MCP-User-Guide
  - type: Authentication
    url: authentication/leadspace-authentication.yml
  - type: OAuthScopes
    url: scopes/leadspace-scopes.yml
- aid: leadspace:leadspace-results-api
  name: Leadspace Results API
  description: Polling for asynchronous discovery results
  humanURL: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  baseURL: https://apigw.leadspace.com
  tags:
  - Results
  properties:
  - type: OpenAPI
    url: openapi/leadspace-results-api-openapi.yml
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/23687993264284-Leadspace-Single-Direct-API-v4-Technical-Specifications
  - type: BulkDocumentation
    url: https://support.leadspace.com/hc/en-us/articles/23687991628572-Leadspace-Bulk-API-v4-Technical-Specifications
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360011926619-Leadspace-Discovery-API
  - type: Documentation
    url: https://support.leadspace.com/hc/en-us/articles/360012583400-Leadspace-Intent-Only-API
common:
- type: Overlay
  url: overlays/leadspace-discovery-overlay.yaml
- type: AgenticAccess
  url: agentic-access/leadspace-agentic-access.yml
- type: Website
  url: https://www.leadspace.com/
- type: DeveloperPortal
  url: https://support.leadspace.com/hc/en-us/categories/5940743388306-Developer-Guides
- type: Documentation
  url: https://support.leadspace.com/hc/en-us
- type: APIReference
  url: https://support.leadspace.com/hc/en-us/sections/201997649-API
- type: GettingStarted
  url: https://support.leadspace.com/hc/en-us/categories/5778624503826-Getting-Started
- type: Support
  url: https://support.leadspace.com/hc/en-us
- type: Blog
  url: https://www.leadspace.com/blog
- type: GitHubOrganization
  url: https://github.com/leadspace
- type: SignUp
  url: https://studio.leadspace.com
- type: TermsOfService
  url: https://www.leadspace.com/service-support-terms
- type: PrivacyPolicy
  url: https://www.leadspace.com/privacy-notice
- type: StatusPage
  url: https://status.leadspace.com/
- type: Deprecation
  url: lifecycle/leadspace-lifecycle.yml
- type: Lifecycle
  url: lifecycle/leadspace-lifecycle.yml
- type: ChangeLog
  url: changelog/leadspace-changelog.yml
- type: ChangeLogPage
  url: https://support.leadspace.com/hc/en-us/categories/7154652740626-Release-Notes
- type: Authentication
  url: authentication/leadspace-authentication.yml
- type: Conventions
  url: conventions/leadspace-conventions.yml
- type: ErrorCatalog
  url: errors/leadspace-problem-types.yml
- type: ErrorCodes
  url: errors/leadspace-error-codes.yml
- type: RateLimits
  url: rate-limits/leadspace-rate-limits.yml
- type: DataModel
  url: data-model/leadspace-data-model.yml
- type: Examples
  url: examples/leadspace-examples.yml
- type: Webhooks
  url: asyncapi/leadspace-callbacks-webhooks.yml
- type: Conformance
  url: conformance/leadspace-conformance.yml
- type: Compliance
  url: https://www.leadspace.com/platform/security-and-compliance
- type: Security
  url: https://www.leadspace.com/report-a-vulnerability
- type: VulnerabilityDisclosure
  url: security/leadspace-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/leadspace-domain-security.yml
- type: WellKnown
  url: well-known/leadspace-well-known.yml
- type: Components
  url: components/leadspace-components.yml
- type: MCPServer
  url: mcp/leadspace-mcp.yml
- type: ToolCrosswalk
  url: mcp/leadspace-tool-crosswalk.yml
- type: OAuthScopes
  url: scopes/leadspace-scopes.yml
- type: TrustCenter
  url: security/leadspace-trust-center.yml
- type: Plans
  url: plans/leadspace-plans-pricing.yml
- type: Pricing
  url: https://www.leadspace.com/solutions/sidekick/pricing
- type: Packages
  url: packages/leadspace-packages.yml
- type: Login
  url: https://skprod.leadspace.com/
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/leadspace-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 8
  artifacts_updated: 8
  pass: local-v1
  note: Leadspace shipped a hosted remote MCP server since the 2026-07-19 pass — https://skprod.leadspace.com/mcp/v1, confirmed
    by an RFC 9728 Bearer challenge and by Leadspace's own published setup instructions — plus first-ever published list pricing.
    MCP, well-known, authentication and conformance upgraded from derived/none to searched/probed.

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