Seamless.AI API catalog

Seamless.AI API Catalog

Every B2B data API you need.
One key. One catalog.

Turn emails, phones, LinkedIn URLs, and domains into full profiles. Search with 48 contact and company filters, enrich in real time, and run outbound, from one REST API or MCP server.

APIs in the catalog

Search filter APIs

MCP tools for AI agents

1 credit

per enriched record

Get an API key →Browse all APIs Connect the MCP server

Find the right endpoint

Pick an input you have, such as an email, a LinkedIn URL, a domain, or a set of filters. Each row shows what you get back, what it costs, and a request you can copy, and links to a full reference page.

Essentials

Base URL

api.seamless.ai/api/client/v1, or /v2 for engagement and reverse lookup.

Auth

Token: YOUR_API_KEY header, or Authorization: Bearer with OAuth.

Limits & credits

60 requests per minute per endpoint. Polling and your own data are free.

For AI agents

Every page in this catalog is built to be read by agents as well as people.

Docs index

/llms.txt lists every page with a one-line summary. /llms-full.txt has the full text.

Markdown pages

Add .md to any page URL, for example /api-catalog/email-to-profile.md, for clean Markdown.

Agent prompts

Each API page has a ready-to-paste AI agent prompt with the exact endpoint and parameters.

MCP server

Skip the HTTP calls: connect https://mcp.seamless.ai/mcp and call 57 tools directly.

Plain-text index of all 67 APIs

API	Category	Request	Credits
Email → Contact Profile	Identity & research	`POST /v1/contacts/research`	1 credit
Phone → Contact Profile	Identity & research	`POST /v2/search/contacts`	1 per 10 results
LinkedIn URL → Contact Profile	Identity & research	`POST /v1/contacts/research`	1 credit
Name + Company → Contact Profile	Identity & research	`POST /v1/contacts/research`	1 credit
Company Name → Website	Identity & research	`POST /v1/search/companies`	1 per 10 results
Website → Company Profile	Identity & research	`POST /v1/companies/research`	1 credit
Search Result → Full Contact	Identity & research	`POST /v1/contacts/research`	1 credit
Search Result → Full Company	Identity & research	`POST /v1/companies/research`	1 credit
Known Contact → Job Change	Identity & research	`POST /v1/contacts/research`	1 credit
Place Name → Location Value	Identity & research	`GET /v1/search/locations`	Free
Date Range → My Contacts	My data	`GET /v1/contacts`	Free
Date Range → My Companies	My data	`GET /v1/companies`	Free
AI Agent → 57 MCP Tools	Platform	`https://mcp.seamless.ai/mcp`	Same as REST
Contacts → Campaigns & Email	Platform	`GET /v2/campaigns`	Plan-based
API Key → Credits & Access	Platform	`GET /v2/credits`	Free
Your ICP → Recommendations	Coming soon	Not yet available	TBD
Best Customers → Look-alikes	Coming soon	Not yet available	TBD
Keyword → Homepage Matches	Coming soon	Not yet available	TBD
Terminal → Seamless CLI	Coming soon	Not yet available	TBD
Job Title → Contacts	Contact filter	`POST /v1/search/contacts` with `jobTitle`	1 per 10 results
Seniority → Contacts	Contact filter	`POST /v1/search/contacts` with `seniority`	1 per 10 results
Department → Contacts	Contact filter	`POST /v1/search/contacts` with `department`	1 per 10 results
Full Name → Contacts	Contact filter	`POST /v1/search/contacts` with `fullName`	1 per 10 results
Profile Keyword → Contacts	Contact filter	`POST /v1/search/contacts` with `contactKeyword`	1 per 10 results
Company Name → Contacts	Contact filter	`POST /v1/search/contacts` with `companyName`	1 per 10 results
Company Domain → Contacts	Contact filter	`POST /v1/search/contacts` with `companyDomain`	1 per 10 results
Location → Contacts	Contact filter	`POST /v1/search/contacts` with `locations`	1 per 10 results
State or Region → Contacts	Contact filter	`POST /v1/search/contacts` with `contactState`	1 per 10 results
Country → Contacts	Contact filter	`POST /v1/search/contacts` with `contactCountry`	1 per 10 results
Zip Code → Contacts	Contact filter	`POST /v1/search/contacts` with `contactZipCode`	1 per 10 results
Timezone → Contacts	Contact filter	`POST /v1/search/contacts` with `timezones`	1 per 10 results
Industry → Contacts	Contact filter	`POST /v1/search/contacts` with `industry`	1 per 10 results
SIC Code → Contacts	Contact filter	`POST /v1/search/contacts` with `industrySicCodes`	1 per 10 results
NAICS Code → Contacts	Contact filter	`POST /v1/search/contacts` with `industryNaicsCodes`	1 per 10 results
Company Size → Contacts	Contact filter	`POST /v1/search/contacts` with `companySize`	1 per 10 results
Company Revenue → Contacts	Contact filter	`POST /v1/search/contacts` with `companyRevenue`	1 per 10 results
Company Age → Contacts	Contact filter	`POST /v1/search/contacts` with `companyFoundedOn`	1 per 10 results
Company Type → Contacts	Contact filter	`POST /v1/search/contacts` with `companyType`	1 per 10 results
Technology → Contacts	Contact filter	`POST /v1/search/contacts` with `technologies`	1 per 10 results
Job Change → Contacts	Contact filter	`POST /v1/search/contacts` with `jobChanges`	1 per 10 results
Past Company → Contacts	Contact filter	`POST /v1/search/contacts` with `pastCompany`	1 per 10 results
Company News → Contacts	Contact filter	`POST /v1/search/contacts` with `newsTypes`	1 per 10 results
Funding Date → Contacts	Contact filter	`POST /v1/search/contacts` with `companyLatestFundingDates`	1 per 10 results
Funding Stage → Contacts	Contact filter	`POST /v1/search/contacts` with `companyLatestFundingClassifications`	1 per 10 results
Total Funding → Contacts	Contact filter	`POST /v1/search/contacts` with `companyLatestFundingTotals`	1 per 10 results
Last Updated Date → Contacts	Contact filter	`POST /v1/search/contacts` with `lastModifiedAfter`	1 per 10 results
Saved Search → Contacts	Contact filter	`POST /v1/search/contacts` with `savedSearchId`	1 per 10 results
Company Name → Companies	Company filter	`POST /v1/search/companies` with `companyName`	1 per 10 results
Company Domain → Companies	Company filter	`POST /v1/search/companies` with `companyDomain`	1 per 10 results
Company Keyword → Companies	Company filter	`POST /v1/search/companies` with `companyKeyword`	1 per 10 results
Location → Companies	Company filter	`POST /v1/search/companies` with `locations`	1 per 10 results
State or Region → Companies	Company filter	`POST /v1/search/companies` with `companyState`	1 per 10 results
Country → Companies	Company filter	`POST /v1/search/companies` with `companyCountry`	1 per 10 results
Zip Code → Companies	Company filter	`POST /v1/search/companies` with `companyZipCode`	1 per 10 results
Industry → Companies	Company filter	`POST /v1/search/companies` with `industry`	1 per 10 results
SIC Code → Companies	Company filter	`POST /v1/search/companies` with `industrySicCodes`	1 per 10 results
NAICS Code → Companies	Company filter	`POST /v1/search/companies` with `industryNaicsCodes`	1 per 10 results
Company Size → Companies	Company filter	`POST /v1/search/companies` with `companySize`	1 per 10 results
Company Revenue → Companies	Company filter	`POST /v1/search/companies` with `companyRevenue`	1 per 10 results
Company Age → Companies	Company filter	`POST /v1/search/companies` with `foundedOn`	1 per 10 results
Company Type → Companies	Company filter	`POST /v1/search/companies` with `companyType`	1 per 10 results
Technology → Companies	Company filter	`POST /v1/search/companies` with `technologies`	1 per 10 results
Company News → Companies	Company filter	`POST /v1/search/companies` with `newsTypes`	1 per 10 results
Funding Date → Companies	Company filter	`POST /v1/search/companies` with `latestFundingDates`	1 per 10 results
Funding Stage → Companies	Company filter	`POST /v1/search/companies` with `latestFundingClassifications`	1 per 10 results
Total Funding → Companies	Company filter	`POST /v1/search/companies` with `latestFundingTotals`	1 per 10 results
Saved Search → Companies	Company filter	`POST /v1/search/companies` with `savedSearchId`	1 per 10 results

How the pieces fit

Resolve or search

Start from something you know with an identity API, or build a list with Contact Search and Company Search using any of the 48 filters.

Research

Send searchResultIds or identifiers to Contact Research or Company Research to unlock emails, phones, and full firmographics.

Sync and act

Read everything you’ve researched with My Contact Data, push it to your CRM, and run outbound with the Engagement API or the MCP server.

Search credits are charged per results returned, and empty pages are free. Research costs 1 credit per record. See Rate limits and credits for exact billing rules. Need higher limits or a data license? Contact your Account Executive.

Catalog

Identity resolution

Search

Contact Search filters

Company Search filters

Research

My data

Platform

Coming soon

Seamless.AI API catalog

Find the right endpoint

Essentials

Base URL

Auth

Limits & credits

For AI agents

Docs index

Markdown pages

Agent prompts

MCP server

How the pieces fit

​Find the right endpoint

​Essentials

Base URL

Auth

Limits & credits

​For AI agents

Docs index

Markdown pages

Agent prompts

MCP server

​How the pieces fit

Find the right endpoint

Essentials

For AI agents

How the pieces fit