Seamless.AI

Seamless.AI is a B2B sales intelligence platform that provides real-time contact and company data to help sales teams find and connect with their ideal customers. The platform uses artificial intelligence to continuously verify and update contact information including emails, direct dials and mobile numbers. Its Public API v1 is a three-hop enrichment pipeline — search, research, then collect by polling or webhook — secured with an API key in a Token header or OAuth 2.0, and metered in research credits rather than API calls. Alongside the nine-operation REST API, Seamless.AI operates a hosted Model Context Protocol server exposing 54 tools across search, research, lists, saved searches, campaigns, templates, email, calls, tasks and activity, secured with OAuth 2.1, dynamic client registration and published per-tool risk tiers.

Seamless.AI publishes 3 API contracts indexed on the APIs.io network: Public API, MCP API, and O Auth API. Tagged areas include B2B, Contact Data, Sales Intelligence, Prospecting, and Lead Generation.

The Seamless.AI catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.

Seamless.AI’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 52 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

66.8/100 exemplar ▬ flat Agent 55/100 agent ready Front door AI 6/6 dominant Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumFree trial

2 published contracts 1 MCP Servers 3 Agent Skills

B2B Contact Data Sales Intelligence Prospecting Lead Generation CRM Enrichment Data Enrichment MCP Agents Sales Automation A2A

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Data & Reference Information Services

AE-230

Company ResearchCompany SearchContact ResearchContact SearchOrg CompaniesOrg Contacts

What people ask Seamless.AI 2

The questions people put to an LLM, and the jobs they hand an agent, that Seamless.AI's APIs answer — each one linked to the operation that does it. Generated by API Evangelist

Seamless.AI O Auth API Exchange credentials for an OAuth access token “How do I turn an authorization code into an access token?”

Seamless.AI MCP API Send a JSON-RPC message to the MCP server “How do I connect my AI assistant to the Seamless.AI MCP server?”

Kin Score

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

Composite quality — 66.8/100 · exemplar

Contract Quality 12.5 / 19

Developer Ergonomics 9.8 / 15

Access Clarity 13.8 / 15

Operational Transparency 3.3 / 10

Contract Governance 2.9 / 9

Discoverability 5.6 / 8

Regulatory Posture 5.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 55/100 · 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 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 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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter
Well-Known Catalog +4 pts — common[].type includes WellKnown, APICatalog, or api-catalog

1 more unmet check in the Agent Readiness table above.

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

Operational Transparency scores 34.2 — up to +8.6 composite points
Contract Quality scores 66.4 — up to +8.4 composite points
Contract Governance scores 31.8 — up to +8.2 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/seamless-ai/apis.yml: open an issue on github.com/api-evangelist/seamless-ai 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 →

Standards implemented 7

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.

Agent2Agent

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

Agent Skills

measured — observed by APIs.io (published)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 3

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

Seamless.AI Public API

The Seamless.AI Public API v1 — nine operations covering contact and company search, asynchronous enrichment (research), result polling, org-data retrieval and the OAuth token e...

Seamless.AI MCP API

The Mcp API from Seamless.AI — 1 operation(s) for mcp.

Seamless.AI O Auth API

The OAuth API from Seamless.AI — 1 operation(s) for oauth.

MCP Servers 1

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

Seamless.AI MCP Server

Remote MCP server at mcp.seamless.ai over HTTP requiring OAuth; 54 tools listed.

Plan details, limits and sources →

Rate limits

Default per-endpoint limit: 60 requests per minute

Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Seamless Ai Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Seamless Ai Rate Limits

1 limits

RATE LIMITS

Service Levels 1

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

Seamless.AI

SLA

FinOps 1

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

Seamless Ai Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Seamless Ai Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Seamless Ai Context

147 classes · 0 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Seamless.AI — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

Seamless.AI API Rules

8 rules · 3 errors 4 warnings 1 info

SPECTRAL

3 actions · update · seamless-ai-org-contacts-api-openapi.yml

DERIVED

Scroll for all 15

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Seamless.AI Company

51 properties

JSON SCHEMA

Seamless.AI Contact

101 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Seamless Ai Company Structure

51 properties

JSON STRUCTURE

Seamless Ai Contact Structure

101 properties

JSON STRUCTURE

Examples 9

Example request and response payloads for these APIs.

Seamless Ai Get Access Token Example

8 fields

EXAMPLE

Seamless Ai Get Companies Example

OAuth scopes governing access to this provider's APIs.

Seamless Ai Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access 1

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

Seamless Ai Agentic Access

10 operations · 4 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 4

Reference material describing how the API behaves

Documentation

APIReference

JSONSchema

JSONSchema

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

LLMsTxt

LlmsText

AgenticAccess

WellKnown

Design & Contract 11

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

JSONStructure

JSONStructure

JSONLDContext

SpectralRuleset

Vocabulary

Scroll for all 11

Build 7

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

Examples

Examples

Examples

PostmanCollection

PostmanCollection

PostmanCollection

PostmanCollection

Scroll for all 7

Access & Security 5

Authentication, authorization, and security posture

Authentication

OAuthScopes

DomainSecurity

TrustCenter

Compliance

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

FinOps

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 12

Properties that don't map to a standard resource type

CapabilityMap

Overview

Glossary

Announcement

AgentCard

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Scroll for all 12

Source (apis.yml)

aid: seamless-ai
url: https://raw.githubusercontent.com/api-evangelist/seamless-ai/refs/heads/main/apis.yml
name: Seamless.AI
type: Index
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
specificationVersion: '0.23'
description: Seamless.AI is a B2B sales intelligence platform that provides real-time contact and company data to help sales
  teams find and connect with their ideal customers. The platform uses artificial intelligence to continuously verify and
  update contact information including emails, direct dials and mobile numbers. Its Public API v1 is a three-hop enrichment
  pipeline — search, research, then collect by polling or webhook — secured with an API key in a Token header or OAuth 2.0,
  and metered in research credits rather than API calls. Alongside the nine-operation REST API, Seamless.AI operates a hosted
  Model Context Protocol server exposing 54 tools across search, research, lists, saved searches, campaigns, templates, email,
  calls, tasks and activity, secured with OAuth 2.1, dynamic client registration and published per-tool risk tiers.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/seamless-ai.png
access: 3rd-Party
position: Consuming
created: '2026-05-02'
modified: '2026-08-14'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- B2B
- Contact Data
- Sales Intelligence
- Prospecting
- Lead Generation
- CRM Enrichment
- Data Enrichment
- MCP
- Agents
- Sales Automation
- A2A
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
accessModel:
  pricing: freemium
  onboarding: sales-assisted
  trial: true
  try_now: false
  public: false
  label: Freemium platform · API gated behind a Public API license
  confidence: high
  source:
  - plans
  - authentication
  - https://seamless.ai/pricing
  - https://docs.seamless.ai/api-http-status-codes
  generated: '2026-08-14'
  method: searched
  note: 'The platform has a self-serve free tier, but the API itself is not self-serve: an account without an active Public
    API license receives HTTP 422 missingLicense, and the paid tiers are quoted by sales rather than priced on the page.'
apis:
- aid: seamless-ai:seamless-ai-public-api
  name: Seamless.AI Public API
  description: The Seamless.AI Public API v1 — nine operations covering contact and company search, asynchronous enrichment
    (research), result polling, org-data retrieval and the OAuth token exchange. Search and org-data reads are free; only
    the research operations spend credits.
  humanURL: https://docs.seamless.ai/
  baseURL: https://api.seamless.ai/api/client/v1
  tags:
  - Contacts
  - Companies
  - Search
  - Data Enrichment
  - Job Changes
  tags_raw:
  - Contacts
  - Companies
  - Search
  - Enrichment
  - Job Changes
  properties:
  - type: OpenAPI
    url: openapi/_original/seamless-ai-public-api-openapi-original.json
  - type: OpenAPI
    name: Contact Search
    url: openapi/seamless-ai-contact-search-api-openapi.yml
  - type: OpenAPI
    name: Company Search
    url: openapi/seamless-ai-company-search-api-openapi.yml
  - type: OpenAPI
    name: Contact Research
    url: openapi/seamless-ai-contact-research-api-openapi.yml
  - type: OpenAPI
    name: Company Research
    url: openapi/seamless-ai-company-research-api-openapi.yml
  - type: OpenAPI
    name: Org Contacts
    url: openapi/seamless-ai-org-contacts-api-openapi.yml
  - type: OpenAPI
    name: Org Companies
    url: openapi/seamless-ai-org-companies-api-openapi.yml
  - type: Documentation
    url: https://docs.seamless.ai/
  - type: APIReference
    url: https://docs.seamless.ai/searchcontacts
  - type: GettingStarted
    url: https://docs.seamless.ai/authenticate-and-make-your-first-request
- aid: seamless-ai:seamless-ai-mcp-api
  name: Seamless.AI MCP API
  description: The Mcp API from Seamless.AI — 1 operation(s) for mcp.
  humanURL: https://docs.seamless.ai/
  baseURL: https://api.seamless.ai/api/client/v1
  tags:
  - MCP
  tags_raw:
  - Mcp
  properties:
  - type: OpenAPI
    url: openapi/seamless-ai-mcp-api-openapi.yml
- aid: seamless-ai:seamless-ai-oauth-api
  name: Seamless.AI O Auth API
  description: The OAuth API from Seamless.AI — 1 operation(s) for oauth.
  humanURL: https://docs.seamless.ai/
  baseURL: https://api.seamless.ai/api/client/v1
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - OAuth
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/seamless-ai-oauth-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/seamless-ai-capability-edges.yml
  name: Seamless.AI Business Capability Map
- type: FinOps
  url: finops/seamless-ai-finops.yml
- type: MCPServer
  url: mcp/seamless-ai-mcp.yml
- name: Website
  url: https://seamless.ai
  type: Website
- name: Developer Portal
  url: https://docs.seamless.ai/
  type: DeveloperPortal
- name: API Documentation
  url: https://docs.seamless.ai/
  type: Documentation
- name: API Reference
  url: https://docs.seamless.ai/searchcontacts
  type: APIReference
- name: Getting Started
  url: https://docs.seamless.ai/authenticate-and-make-your-first-request
  type: GettingStarted
- name: API Overview
  url: https://seamless.ai/products/api
  type: Overview
- name: Support
  url: https://seamless.ai/customers/education
  type: Support
- name: Blog
  url: https://seamless.ai/customers/blog
  type: Blog
- name: Pricing
  url: https://seamless.ai/pricing
  type: Pricing
- name: Sign Up
  url: https://login.seamless.ai/register
  type: SignUp
- name: Login
  url: https://login.seamless.ai/login
  type: Login
- name: Terms of Use
  url: https://seamless.ai/policies/terms-of-use
  type: TermsOfService
- name: Privacy Policy
  url: https://seamless.ai/policies/privacy-policy
  type: PrivacyPolicy
- name: GitHub Organization
  url: https://github.com/SeamlessAI
  type: GitHubOrganization
- name: API Terms Glossary
  url: https://seamless.ai/customers/education/articles/api-terms-glossary
  type: Glossary
- name: API Launch Announcement
  url: https://seamless.ai/news/releases/api
  type: Announcement
- type: LinkedIn
  url: https://www.linkedin.com/company/seamlessai
- name: A2A Agent Card
  url: a2a/seamless-ai-a2a.yml
  type: AgentCard
- name: Agent Skills
  url: skills/_index.yml
  type: AgentSkill
- name: llms.txt
  url: llms/seamless-ai-llms.txt
  type: LLMsTxt
- type: LlmsText
  url: https://docs.seamless.ai/llms.txt
- type: AgenticAccess
  url: agentic-access/seamless-ai-agentic-access.yml
- name: Well-Known Discovery
  url: well-known/seamless-ai-well-known.yml
  type: WellKnown
- type: Authentication
  url: authentication/seamless-ai-authentication.yml
- type: OAuthScopes
  url: scopes/seamless-ai-scopes.yml
- type: Conventions
  url: conventions/seamless-ai-conventions.yml
- type: ErrorCatalog
  url: errors/seamless-ai-problem-types.yml
- type: RateLimits
  url: rate-limits/seamless-ai-rate-limits.yml
- type: Plans
  url: plans/seamless-ai-plans-pricing.yml
- type: Lifecycle
  url: lifecycle/seamless-ai-lifecycle.yml
- type: Conformance
  url: conformance/seamless-ai-conformance.yml
- type: DataModel
  url: data-model/seamless-ai-data-model.yml
- type: Packages
  url: packages/seamless-ai-packages.yml
- type: Webhooks
  url: asyncapi/seamless-ai-webhooks.yml
- type: DomainSecurity
  url: security/seamless-ai-domain-security.yml
- type: TrustCenter
  url: security/seamless-ai-trust-center.yml
- name: Trust Center
  url: https://trust.seamless.ai/
  type: Compliance
- name: Contact Search Overlay
  url: overlays/seamless-ai-contact-search-overlay.yaml
  type: Overlay
- name: Company Search Overlay
  url: overlays/seamless-ai-company-search-overlay.yaml
  type: Overlay
- name: Contact Research Overlay
  url: overlays/seamless-ai-contact-research-overlay.yaml
  type: Overlay
- name: Company Research Overlay
  url: overlays/seamless-ai-company-research-overlay.yaml
  type: Overlay
- name: Org Contacts Overlay
  url: overlays/seamless-ai-org-contacts-overlay.yaml
  type: Overlay
- name: Org Companies Overlay
  url: overlays/seamless-ai-org-companies-overlay.yaml
  type: Overlay
- name: OAuth Overlay
  url: overlays/seamless-ai-oauth-overlay.yaml
  type: Overlay
- url: json-schema/seamless-ai-contact-schema.json
  type: JSONSchema
- url: json-schema/seamless-ai-company-schema.json
  type: JSONSchema
- url: json-structure/seamless-ai-contact-structure.json
  type: JSONStructure
- url: json-structure/seamless-ai-company-structure.json
  type: JSONStructure
- url: json-ld/seamless-ai-context.jsonld
  type: JSONLDContext
- url: examples/seamless-ai-search-contacts-example.json
  type: Examples
- url: examples/seamless-ai-research-contacts-example.json
  type: Examples
- url: examples/seamless-ai-poll-contacts-research-results-example.json
  type: Examples
- url: rules/seamless-ai-rules.yml
  type: SpectralRuleset
- url: vocabulary/seamless-ai-vocabulary.yml
  type: Vocabulary
- name: Contact Search Postman Collection
  url: collections/seamless-ai-contact-search-api.postman_collection.json
  type: PostmanCollection
- name: Company Search Postman Collection
  url: collections/seamless-ai-company-search-api.postman_collection.json
  type: PostmanCollection
x-enrichment:
  date: '2026-08-14'
  status: enriched
  artifacts_added: 24
  pass: local-v1
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://docs.seamless.ai/.well-known/agent-card.json
  grade: conformant
  protocol_version: '0.3'
  control: 404

Seamless.AI API — frequently asked questions

Does Seamless.AI have an API?

Yes. APIs.io lists 3 APIs from Seamless.AI, including Seamless.AI Public API, Seamless.AI MCP API and Seamless.AI O Auth API.

Is there an OpenAPI specification for the Seamless.AI API?

Yes. APIs.io indexes 3 OpenAPI specifications for Seamless.AI, each linked for download from this page.

How do I authenticate with the Seamless.AI API?

Seamless.AI documents its authentication (apiKey/oauth2 · 3 schemes). The details are profiled on APIs.io as Seamless Ai Authentication.

How much does the Seamless.AI API cost?

APIs.io lists 3 pricing plans for Seamless.AI, with each plan's price, limits and inclusions under Pricing on this page.

Does Seamless.AI have an MCP server?

Yes. APIs.io lists 1 MCP server for Seamless.AI: Remote MCP server at mcp.seamless.ai over HTTP requiring OAuth; 54 tools listed.

Is the Seamless.AI API ready for AI agents?

Seamless.AI has a Kin Score of 66.8 out of 100 (exemplar) and an Agent Readiness score of 55.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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