lemlist

lemlist is a sales engagement and cold outreach platform from lempire that helps sales teams build prospect lists, personalize multichannel campaigns across email, LinkedIn, phone, SMS and WhatsApp, and automate follow-ups to book more meetings. It includes a 650M+ record B2B lead database, credit-metered email and phone enrichment, Signal Agents that watch for buying triggers, a unified reply inbox, and lemwarm deliverability warm-up. The developer surface is unusually agent-forward for its category - a 143-operation REST API documented with a published OpenAPI, a hosted remote MCP server at app.lemlist.com/mcp with OAuth 2.1 and dynamic client registration, an official OpenAPI-generated CLI on npm, an llms.txt index, a published Agent Skill, and a 76-event webhook catalog.

lemlist publishes 22 API contracts indexed on the APIs.io network, including Campaigns API, Sequences API, Leads API, and 19 more. Tagged areas include Email Outreach, Sales Engagement, Cold Email, Sales Automation, and LinkedIn Outreach.

The lemlist catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

lemlist’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 37 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

76.0/100 exemplar ▬ flat Agent 65/100 agent ready Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidSelf serveFree trial

2 published contracts 1 MCP Servers 3 Agent Skills

Email OutreachSales Engagement Cold Email Sales AutomationLinkedIn OutreachLead Generation Data Enrichment Deliverability CRMMultichannel MessagingWebhook MCP A2A

What this lets a business do 5

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

Data & Reference Information Services

AE-230

EnrichPeople database

POST /database/people POST /database/companies POST /leads/{leadId}/enrich POST /v2/enrichments/bulk

Customer Relationship Management

BC-420

CompaniesContacts

GET /contacts POST /contacts POST /contacts/lists GET /contacts/export

Marketing Management

BC-400

Campaigns

GET /campaigns POST /campaigns GET /campaigns/{campaignId} GET /campaigns/{campaignId}/export/leads

Sales Management

BC-410

Leads

POST /leads/pause/{leadId} POST /leads/interested/{leadIdOrEmail} POST /campaigns/{campaignId}/leads/{email} POST /campaigns/{campaignId}/leads/

Developer Platform & API Ecosystem Management

BC-4270

Webhooks

GET /hooks POST /hooks DELETE /hooks/{hookId}

What people ask lemlist 21

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

lemlist Leads API Resume a paused lead “How do I let a paused lead continue through the campaign sequence?” Pause a lead's sequence “Can I stop sending to one lead while the campaign keeps running?” Mark a lead interested in all campaigns “How do I flag a lead as interested across every campaign they're in?” Mark a lead not interested in all campaigns “How do I record that a prospect said no, across all campaigns?”

lemlist Unsubscribes API List unsubscribes via the trailing-slash route “Is there an older trailing-slash route that lists unsubscribed emails?” Export unsubscribes with the legacy export route “Can I download my unsubscribe list through the original unsubs export?” Check the sample john.doe@domain.com unsubscribe “What does the documentation example for checking john.doe@domain.com return?” Unsubscribe the sample john.doe@domain.com “What happens when I call the documentation example that unsubscribes john.doe@domain.com?”

lemlist Inbox API List my inbox conversations “Which conversations are waiting in my lemlist unified inbox?” Read the message thread with a contact “How do I read the full conversation history with one contact?” Send an email to a contact from the inbox “How do I send a one-off email reply to a lead from the inbox?” Send a LinkedIn message to a contact “Can I send a LinkedIn DM to a lead through the API?”

lemlist Campaigns API List my campaigns “Which outreach campaigns do I have in lemlist right now?” Create a new campaign “How do I start a brand-new outreach campaign from scratch?” Get one campaign's details “Where can I see the full details of a single campaign?” Update a campaign's settings “Can I make a campaign stop sending once a lead books a meeting?”

lemlist Signal Agents API Get signals detected by my Signal Agents “What buying signals have my Signal Agents picked up this week?” Push an external signal into a Signal Agent “How do I feed signals from my own tools into a lemlist Signal Agent?” List my Signal Agents “Which Signal Agents has my team set up?” Create a Signal Agent “How do I set up an agent that watches for a particular buying signal?”

lemlist Sequences API Get a campaign's sequences and steps “What steps make up a campaign's outreach sequence?” Add a step to a sequence “How do I add another follow-up step to a sequence?” Edit a sequence step “How do I change the content or delay of an existing step?” Delete a step from a sequence “Can I remove one step from a campaign's sequence?”

lemlist People Database API List the filters the People Database supports “Which filter ids can I use when searching the lemlist People Database?” Search the People Database for prospects “How do I search for people matching my ideal customer profile?” Get the field schema for people records “What fields come back on a person record from the People Database?” Search the database for companies “How do I look up companies that match my target account criteria?”

lemlist Contacts API Look up one contact by id or email “Can I pull up a single contact using just their email address?” Delete a contact and everything tied to it “What else gets removed when I delete a contact, like their leads and conversations?” List all my contacts “Which contacts are in my lemlist CRM?” Create or update a contact “How do I add a person, or update them if their email already exists?”

lemlist Schedules API List my sending schedules “Which sending schedules exist in my lemlist team?” Create a sending schedule “How do I set up a schedule so emails only go out on weekdays during business hours?” Get one sending schedule “What hours and days does a particular schedule send on?” Edit a sending schedule “How do I change the timezone of an existing schedule?”

lemlist Companies API List or search my companies “Which companies are stored in my lemlist account?” Create or update a company “How do I add a company, or update it if its domain already exists?” Add a note to a company “How do I attach a note to a company record?” List a company's notes “Where can I read the notes my team left on a company?”

lemlist Deliverability Alerts API List my deliverability alerts “Which deliverability alerts have I configured for my mailboxes?” Create a deliverability alert “How do I get notified when a mailbox's bounce rate crosses a threshold?” Get one deliverability alert “What exactly does a particular deliverability alert check for?” Update or pause a deliverability alert “How do I change the threshold on an existing deliverability alert?”

lemlist Team API Get my team's details “What team is my lemlist API key attached to?” List senders and their campaigns “Which teammates are sending which campaigns?” Check my team's remaining credits “How many enrichment credits does my team have left?” List team members' connected CRMs “Which CRMs have my teammates connected to lemlist?”

Showing 12 of 21 APIs with phrasing — see every API.

Kin Score

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

Composite quality — 76.0/100 · exemplar

Contract Quality 10.5 / 19

Developer Ergonomics 11.8 / 15

Access Clarity 14.0 / 15

Operational Transparency 5.6 / 10

Contract Governance 2.9 / 9

Discoverability 5.6 / 8

Regulatory Posture 6.8 / 15

Create-or-Update Ergonomics 5.0 / 10

Agent readiness — 65/100 · 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):

Contract Quality scores 55.9 — up to +11.0 composite points
Contract Governance scores 31.8 — up to +8.2 composite points
Operational Transparency scores 57.9 — up to +5.5 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/lemlist/apis.yml: open an issue on github.com/api-evangelist/lemlist 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Salesforce AppExchange (CRM, outbound, business-process automation)	builds-on	21.2	-	1
HubSpot App Marketplace (CRM add-ons, outbound, performance marketing, chat)	builds-on	21.2	-	1
Pipedrive Marketplace (CRM integrations from third-party publishers for the SMB sales CRM)	builds-on	21.2	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 8

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 (verified)

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)

OpenID Connect

measured — observed by APIs.io (declared)

APIs 22

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

lemlist MCP Server

lemlist's hosted remote Model Context Protocol server. An MCP client POSTs to https://app.lemlist.com/mcp and authenticates with OAuth 2.1 (authorization code + PKCE, dynamic cl...

lemlist Campaigns API

Campaign CRUD and lifecycle - create, update, duplicate, start, pause, validation statutes, stats, reports and asynchronous exports.

lemlist Sequences API

Campaign sequences, their steps, and A/B test variants on email steps.

lemlist Leads API

Leads inside campaigns - create with optional enrichment, update, pause, resume, mark interested, custom variables, CRM import and unsubscribe.

lemlist People Database API

Search the lemlist B2B people and company database, list its filters, and manage saved personas.

lemlist Enrich API

Asynchronous enrichment - find and verify emails, phone numbers and LinkedIn data, single or in bulk, then poll for the result. Credit-metered.

lemlist Inbox API

The unified reply inbox - conversations, messages, drafts, labels and sending on email, LinkedIn and WhatsApp.

lemlist Contacts API

CRM-side contacts, contact lists, list membership and exports.

lemlist Companies API

CRM-side companies and company notes.

lemlist Signal Agents API

Signal Agents (watch lists) - create and configure watches, list the available signal types and filters, read detected signals, and push external signals.

lemlist Webhooks API

Webhook subscription management - list, create with an optional shared secret, and delete. 76 event types are documented.

lemlist Unsubscribes API

Suppression management - unsubscribe and re-subscribe contacts and variables, list and export the suppression set, and the legacy email/domain surface.

lemlist Schedules API

Sending schedules - CRUD and association with campaigns.

lemlist Tasks API

Manual tasks - list, create, update and ignore.

lemlist Activities API

The activity history feed, and deletion of call recordings and transcripts.

lemlist Team API

Team-level endpoints - team information, senders, remaining credits and CRM users.

lemlist Users API

User endpoints - user detail and the connected channels available to the authenticated user.

lemlist Email Accounts API

Connect, test and disconnect custom SMTP/IMAP sending accounts.

lemlist Lemwarm API

lemwarm mailbox warm-up - start, pause, and read or update warm-up settings per mailbox.

lemlist Deliverability Alerts API

Threshold alerts on deliverability metrics - create, read, update and delete.

lemlist Fields API

The custom field definitions available on leads, contacts and companies.

lemlist Stats API

The Stats API from lemlist — 2 operation(s) for stats.

Scroll for all 22

Open Collections 4

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

lemlist Campaigns API

OPEN COLLECTION

lemlist Campaigns Team API

OPEN COLLECTION

lemlist Campaigns Users API

OPEN COLLECTION

lemlist API

OPEN COLLECTION

MCP Servers 1

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

lemlist MCP Server

Remote MCP server at app.lemlist.com over HTTP requiring OAuth; 30 tools listed.

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

lemlist-enrich-and-sync

AGENT SKILL

lemlist-launch-campaign

AGENT SKILL

lemlist-monitor-and-reply

AGENT SKILL

lemlist API pricing

Prices published by lemlist, read 2026-10-28 from www.lemlist.com/pricing.

Plan	Price
Email	$69 $55/ month Includes: 50,000 emails /mo, unlimited users & email senders
Multichannel	$109 $87/ month Includes: Unlimited emails & messages, 5 senders per user
Enterprise	Custom Includes: Features of the Multichannel plan + ≥ 5 senders per user
Lead data enrichment add-on	$20 $16/ month Includes: 2k credits /mo (400 emails or 100 phones)
Buying intent signals add-on	$29 $21/ month Includes: 100 signals /mo

Plan details, limits and sources →

Rate limits

: 20 2 seconds

Rate-limit details →

Billed by: unlimited users · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Lemlist Plans Pricing

5 plans

PLANS

Lemlist Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Lemlist 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.

lemlist

SLA

FinOps 1

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

Lemlist Finops

FINOPS

Event Specifications 1

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

Lemlist Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

lemlist API Rules

48 rules · 34 errors 13 warnings 1 info

SPECTRAL

OpenAPI Overlays 22

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Lemlist Activities Api Phrasing Overlay

4 actions · phrasing · lemlist-activities-api-openapi.yml

GENERATED

Lemlist Api Overlay

9 actions · update · lemlist-openapi-v2.json

DERIVED

Lemlist Campaigns Api Phrasing Overlay

16 actions · phrasing · lemlist-campaigns-api-openapi.yml

GENERATED

Lemlist Companies Api Phrasing Overlay

6 actions · phrasing · lemlist-companies-api-openapi.yml

GENERATED

Lemlist Contacts Api Phrasing Overlay

9 actions · phrasing · lemlist-contacts-api-openapi.yml

GENERATED

Lemlist Deliverability Alerts Api Phrasing Overlay

6 actions · phrasing · lemlist-deliverability-alerts-api-openapi.yml

GENERATED

Lemlist Email Accounts Api Phrasing Overlay

4 actions · phrasing · lemlist-email-accounts-api-openapi.yml

GENERATED

Lemlist Enrich Api Phrasing Overlay

5 actions · phrasing · lemlist-enrich-api-openapi.yml

GENERATED

Lemlist Fields Api Phrasing Overlay

2 actions · phrasing · lemlist-fields-api-openapi.yml

GENERATED

Lemlist Inbox Api Phrasing Overlay

16 actions · phrasing · lemlist-inbox-api-openapi.yml

GENERATED

Lemlist Leads Api Phrasing Overlay

23 actions · phrasing · lemlist-leads-api-openapi.yml

GENERATED

Lemlist Lemwarm Api Phrasing Overlay

5 actions · phrasing · lemlist-lemwarm-api-openapi.yml

GENERATED

Lemlist People Database Api Phrasing Overlay

9 actions · phrasing · lemlist-people-database-api-openapi.yml

GENERATED

Lemlist Schedules Api Phrasing Overlay

8 actions · phrasing · lemlist-schedules-api-openapi.yml

GENERATED

Lemlist Sequences Api Phrasing Overlay

10 actions · phrasing · lemlist-sequences-api-openapi.yml

GENERATED

Lemlist Signal Agents Api Phrasing Overlay

11 actions · phrasing · lemlist-signal-agents-api-openapi.yml

GENERATED

Lemlist Stats Api Phrasing Overlay

3 actions · phrasing · lemlist-stats-api-openapi.yml

GENERATED

Lemlist Tasks Api Phrasing Overlay

5 actions · phrasing · lemlist-tasks-api-openapi.yml

GENERATED

Lemlist Team Api Phrasing Overlay

5 actions · phrasing · lemlist-team-api-openapi.yml

GENERATED

Lemlist Unsubscribes Api Phrasing Overlay

20 actions · phrasing · lemlist-unsubscribes-api-openapi.yml

GENERATED

Lemlist Users Api Phrasing Overlay

3 actions · phrasing · lemlist-users-api-openapi.yml

GENERATED

Lemlist Webhooks Api Phrasing Overlay

4 actions · phrasing · lemlist-webhooks-api-openapi.yml

GENERATED

Scroll for all 22

Examples 1

Example request and response payloads for these APIs.

Lemlist Examples

143 fields

EXAMPLE

Security Posture 4

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

Lemlist Authentication

http/apiKey/oauth2/openIdConnect · 4 schemes

SECURITY

Lemlist Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Lemlist Vulnerability Disclosure

Hackerone

SECURITY

Lemlist Trust Center

SOC 2 Type 2

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Lemlist Scopes

14 scopes · authorizationCode

14 scopes

SCOPES

Agentic Access 1

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

Lemlist Agentic Access

153 operations · 86 acting

AGENTIC

Resources

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 6

MCP servers, agent skills, and machine-readable catalogs

WellKnown

MCPServer

AgentSkill

AgenticAccess

LLMsTxt

LlmsText

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Lifecycle

Conformance

Webhooks

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Examples

Packages

SDKs

CLI

Access & Security 7

Authentication, authorization, and security posture

Authentication

OAuthScopes

Compliance

TrustCenter

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Scroll for all 7

Operate 4

Status, limits, changes, and where to get help

Support

RateLimits

StatusPage

Deprecation

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

AgentCard

AgentCard

Source (apis.yml)

aid: lemlist
name: lemlist
description: lemlist is a sales engagement and cold outreach platform from lempire that helps sales teams build prospect lists,
  personalize multichannel campaigns across email, LinkedIn, phone, SMS and WhatsApp, and automate follow-ups to book more
  meetings. It includes a 650M+ record B2B lead database, credit-metered email and phone enrichment, Signal Agents that watch
  for buying triggers, a unified reply inbox, and lemwarm deliverability warm-up. The developer surface is unusually agent-forward
  for its category - a 143-operation REST API documented with a published OpenAPI, a hosted remote MCP server at app.lemlist.com/mcp
  with OAuth 2.1 and dynamic client registration, an official OpenAPI-generated CLI on npm, an llms.txt index, a published
  Agent Skill, and a 76-event webhook catalog.
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
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: true
  try_now: false
  public: true
  label: Self-serve signup with a 14-day free trial
  confidence: high
  source:
  - https://www.lemlist.com/pricing
  - https://app.lemlist.com/create-account
  generated: '2026-08-13'
  method: searched
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/lemlist.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: vercel
tags:
- Email Outreach
- Sales Engagement
- Cold Email
- Sales Automation
- LinkedIn Outreach
- Lead Generation
- Data Enrichment
- Deliverability
- CRM
- Multichannel Messaging
- Webhook
- MCP
- A2A
tags_raw:
- Email Outreach
- Sales Engagement
- Cold Email
- Sales Automation
- LinkedIn Outreach
- Lead Generation
- Data Enrichment
- Deliverability
- CRM
- Multichannel Messaging
- Webhooks
- MCP
- A2A
url: https://raw.githubusercontent.com/api-evangelist/lemlist/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: lemlist:mcp-server
  name: lemlist MCP Server
  description: lemlist's hosted remote Model Context Protocol server. An MCP client POSTs to https://app.lemlist.com/mcp and
    authenticates with OAuth 2.1 (authorization code + PKCE, dynamic client registration) or an X-API-Key header. lemlist
    advertises roughly 40 tools covering lead search, enrichment, campaign and sequence management, stats, the inbox and webhooks.
  humanURL: https://developer.lemlist.com/mcp/setup
  baseURL: https://app.lemlist.com/mcp
  tags:
  - MCP
  - Agents
  properties:
  - type: MCPServer
    url: mcp/lemlist-mcp.yml
  - type: ToolCrosswalk
    url: mcp/lemlist-tool-crosswalk.yml
  - type: Documentation
    url: https://developer.lemlist.com/mcp/setup
- aid: lemlist:lemlist-campaigns-api
  name: lemlist Campaigns API
  description: Campaign CRUD and lifecycle - create, update, duplicate, start, pause, validation statutes, stats, reports
    and asynchronous exports.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/campaigns/get-many-campaigns
  baseURL: https://api.lemlist.com/api
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/lemlist-campaigns-api-openapi.yml
- aid: lemlist:lemlist-sequences-api
  name: lemlist Sequences API
  description: Campaign sequences, their steps, and A/B test variants on email steps.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/sequences/get-campaign-sequences
  baseURL: https://api.lemlist.com/api
  tags:
  - Sequences
  properties:
  - type: OpenAPI
    url: openapi/lemlist-sequences-api-openapi.yml
- aid: lemlist:lemlist-leads-api
  name: lemlist Leads API
  description: Leads inside campaigns - create with optional enrichment, update, pause, resume, mark interested, custom variables,
    CRM import and unsubscribe.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/leads/create-lead-in-campaign
  baseURL: https://api.lemlist.com/api
  tags:
  - Leads
  properties:
  - type: OpenAPI
    url: openapi/lemlist-leads-api-openapi.yml
- aid: lemlist:lemlist-people-database-api
  name: lemlist People Database API
  description: Search the lemlist B2B people and company database, list its filters, and manage saved personas.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/people-database/search-people-database
  baseURL: https://api.lemlist.com/api
  tags:
  - People Database
  - Lead Generation
  properties:
  - type: OpenAPI
    url: openapi/lemlist-people-database-api-openapi.yml
- aid: lemlist:lemlist-enrich-api
  name: lemlist Enrich API
  description: Asynchronous enrichment - find and verify emails, phone numbers and LinkedIn data, single or in bulk, then
    poll for the result. Credit-metered.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/enrich/enrich-data
  baseURL: https://api.lemlist.com/api
  tags:
  - Enrich
  - Data Enrichment
  properties:
  - type: OpenAPI
    url: openapi/lemlist-enrich-api-openapi.yml
- aid: lemlist:lemlist-inbox-api
  name: lemlist Inbox API
  description: The unified reply inbox - conversations, messages, drafts, labels and sending on email, LinkedIn and WhatsApp.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Inbox
  - Multichannel Messaging
  properties:
  - type: OpenAPI
    url: openapi/lemlist-inbox-api-openapi.yml
- aid: lemlist:lemlist-contacts-api
  name: lemlist Contacts API
  description: CRM-side contacts, contact lists, list membership and exports.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Contacts
  - CRM
  properties:
  - type: OpenAPI
    url: openapi/lemlist-contacts-api-openapi.yml
- aid: lemlist:lemlist-companies-api
  name: lemlist Companies API
  description: CRM-side companies and company notes.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Companies
  - CRM
  properties:
  - type: OpenAPI
    url: openapi/lemlist-companies-api-openapi.yml
- aid: lemlist:lemlist-signal-agents-api
  name: lemlist Signal Agents API
  description: Signal Agents (watch lists) - create and configure watches, list the available signal types and filters, read
    detected signals, and push external signals.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/watch-list/list-watch-lists
  baseURL: https://api.lemlist.com/api
  tags:
  - Signal Agents
  - Buying Signals
  properties:
  - type: OpenAPI
    url: openapi/lemlist-signal-agents-api-openapi.yml
- aid: lemlist:lemlist-webhooks-api
  name: lemlist Webhooks API
  description: Webhook subscription management - list, create with an optional shared secret, and delete. 76 event types are
    documented.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/webhooks/add-webhook
  baseURL: https://api.lemlist.com/api
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/lemlist-webhooks-api-openapi.yml
  - type: Webhooks
    url: asyncapi/lemlist-webhooks.yml
- aid: lemlist:lemlist-unsubscribes-api
  name: lemlist Unsubscribes API
  description: Suppression management - unsubscribe and re-subscribe contacts and variables, list and export the suppression
    set, and the legacy email/domain surface.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Unsubscribes
  - Compliance
  properties:
  - type: OpenAPI
    url: openapi/lemlist-unsubscribes-api-openapi.yml
- aid: lemlist:lemlist-schedules-api
  name: lemlist Schedules API
  description: Sending schedules - CRUD and association with campaigns.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Schedule
  tags_raw:
  - Schedules
  properties:
  - type: OpenAPI
    url: openapi/lemlist-schedules-api-openapi.yml
- aid: lemlist:lemlist-tasks-api
  name: lemlist Tasks API
  description: Manual tasks - list, create, update and ignore.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/lemlist-tasks-api-openapi.yml
- aid: lemlist:lemlist-activities-api
  name: lemlist Activities API
  description: The activity history feed, and deletion of call recordings and transcripts.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Activities
  properties:
  - type: OpenAPI
    url: openapi/lemlist-activities-api-openapi.yml
- aid: lemlist:lemlist-team-api
  name: lemlist Team API
  description: Team-level endpoints - team information, senders, remaining credits and CRM users.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/team/get-team
  baseURL: https://api.lemlist.com/api
  tags:
  - Team
  properties:
  - type: OpenAPI
    url: openapi/lemlist-team-api-openapi.yml
- aid: lemlist:lemlist-users-api
  name: lemlist Users API
  description: User endpoints - user detail and the connected channels available to the authenticated user.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/users/get-user
  baseURL: https://api.lemlist.com/api
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/lemlist-users-api-openapi.yml
- aid: lemlist:lemlist-email-accounts-api
  name: lemlist Email Accounts API
  description: Connect, test and disconnect custom SMTP/IMAP sending accounts.
  humanURL: https://developer.lemlist.com/api-reference/endpoints/email-accounts/connect-email-account
  baseURL: https://api.lemlist.com/api
  tags:
  - Email Accounts
  - Deliverability
  properties:
  - type: OpenAPI
    url: openapi/lemlist-email-accounts-api-openapi.yml
- aid: lemlist:lemlist-lemwarm-api
  name: lemlist Lemwarm API
  description: lemwarm mailbox warm-up - start, pause, and read or update warm-up settings per mailbox.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - lemwarm
  - Deliverability
  properties:
  - type: OpenAPI
    url: openapi/lemlist-lemwarm-api-openapi.yml
- aid: lemlist:lemlist-deliverability-alerts-api
  name: lemlist Deliverability Alerts API
  description: Threshold alerts on deliverability metrics - create, read, update and delete.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Deliverability alerts
  - Deliverability
  properties:
  - type: OpenAPI
    url: openapi/lemlist-deliverability-alerts-api-openapi.yml
- aid: lemlist:lemlist-fields-api
  name: lemlist Fields API
  description: The custom field definitions available on leads, contacts and companies.
  humanURL: https://developer.lemlist.com/api-reference
  baseURL: https://api.lemlist.com/api
  tags:
  - Fields
  properties:
  - type: OpenAPI
    url: openapi/lemlist-fields-api-openapi.yml
- aid: lemlist:lemlist-stats-api
  name: lemlist Stats API
  description: The Stats API from lemlist — 2 operation(s) for stats.
  humanURL: https://developer.lemlist.com/mcp/setup
  baseURL: https://app.lemlist.com/mcp
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/lemlist-stats-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/lemlist-capability-edges.yml
  name: lemlist Business Capability Map
- type: Website
  url: https://www.lemlist.com
- type: DeveloperPortal
  url: https://developer.lemlist.com
- type: Documentation
  url: https://developer.lemlist.com
- type: APIReference
  url: https://developer.lemlist.com/api-reference/getting-started/overview
- type: GettingStarted
  url: https://developer.lemlist.com/api-reference/getting-started/overview
- type: Support
  url: https://help.lemlist.com
- type: Blog
  url: https://www.lemlist.com/blog
- type: GitHubOrganization
  url: https://github.com/l3mpire
- type: Pricing
  url: https://www.lemlist.com/pricing
- type: SignUp
  url: https://app.lemlist.com/create-account
- type: Login
  url: https://app.lemlist.com/login
- type: TermsOfService
  url: https://www.lemlist.com/legal/terms
- type: PrivacyPolicy
  url: https://www.lemlist.com/legal/privacy-policy
- type: LinkedIn
  url: https://www.linkedin.com/company/lemlist
- type: Integrations
  url: https://www.lemlist.com/integrations
- type: Plans
  url: plans/lemlist-plans-pricing.yml
- type: RateLimits
  url: rate-limits/lemlist-rate-limits.yml
- type: Authentication
  url: authentication/lemlist-authentication.yml
- type: OAuthScopes
  url: scopes/lemlist-scopes.yml
- type: Conventions
  url: conventions/lemlist-conventions.yml
- type: ErrorCatalog
  url: errors/lemlist-problem-types.yml
- type: DataModel
  url: data-model/lemlist-data-model.yml
- type: Examples
  url: examples/lemlist-examples.yml
- type: Overlay
  url: overlays/lemlist-api-overlay.yaml
- type: Lifecycle
  url: lifecycle/lemlist-lifecycle.yml
- type: StatusPage
  url: https://status.lemlist.com
- type: Deprecation
  url: https://developer.lemlist.com/api-reference/getting-started/version
- type: Conformance
  url: conformance/lemlist-conformance.yml
- type: Compliance
  url: https://trust.lemlist.com/
- type: TrustCenter
  url: security/lemlist-trust-center.yml
- type: Security
  url: https://hackerone.com/lemlist
- type: VulnerabilityDisclosure
  url: security/lemlist-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/lemlist-domain-security.yml
- type: WellKnown
  url: well-known/lemlist-well-known.yml
- type: Webhooks
  url: asyncapi/lemlist-webhooks.yml
- type: MCPServer
  url: mcp/lemlist-mcp.yml
- type: AgentCard
  url: a2a/lemlist-a2a.yml
- type: AgentSkill
  url: skills/_index.yml
- type: AgenticAccess
  url: agentic-access/lemlist-agentic-access.yml
- type: Packages
  url: packages/lemlist-packages.yml
- type: SDKs
  url: packages/lemlist-packages.yml
- type: CLI
  url: cli/lemlist-cli.yml
- type: LLMsTxt
  url: llms/lemlist-llms.txt
- type: LlmsText
  url: https://developer.lemlist.com/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 22
  pass: local-v1
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://developer.lemlist.com/.well-known/agent-card.json
  grade: conformant
  protocol_version: '0.3'
  control: 404

lemlist API — frequently asked questions

Does lemlist have an API?

Yes. APIs.io lists 22 APIs from lemlist, including lemlist MCP Server, lemlist Campaigns API and lemlist Sequences API, and 19 more.

Is there an OpenAPI specification for the lemlist API?

Yes. APIs.io indexes 21 OpenAPI specifications for lemlist, each linked for download from this page.

How do I authenticate with the lemlist API?

lemlist documents its authentication (http/apiKey/oauth2/openIdConnect · 4 schemes). The details are profiled on APIs.io as Lemlist Authentication.

How much does the lemlist API cost?

lemlist publishes its prices; its Email plan is $69 $55/ month as of 2026-10-28. APIs.io lists 5 pricing plans for lemlist, with each plan's price, limits and inclusions under Pricing on this page.

Does lemlist have an MCP server?

Yes. APIs.io lists 1 MCP server for lemlist: Remote MCP server at app.lemlist.com over HTTP requiring OAuth; 30 tools listed.

Is the lemlist API ready for AI agents?

lemlist has a Kin Score of 76.0 out of 100 (exemplar) and an Agent Readiness score of 65.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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