# lemlist

**Canonical:** https://apis.io/providers/lemlist/  
**Website:** https://www.lemlist.com  
**APIs profiled:** 22

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.

## Kin Score — 68.0 / 100 (exemplar)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 68.0).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 63.3 |
| Governance | 30.3 |
| Contract Governance | 30.3 |
| Operational Transparency | 50.0 |
| Developer Ergonomics | 78.6 |
| Commercial Clarity | 85.5 |
| Access Clarity | 85.5 |

## Agent readiness — 62.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |

## Access

Self-serve signup with a 14-day free trial — onboarding: self-serve, pricing: paid, trial: yes (confidence: high).

## APIs (22)

- **lemlist REST API** — The full lemlist REST API - 143 operations across campaigns, sequences, leads, contacts, companies, the B2B people database, enrichment, the unified inbox, Signal Agents, unsubs...
- **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.

## MCP servers (1)

- **lemlist MCP Server**

## Agentic access (1)

- **Lemlist Agentic Access** — 143 operations · 84 acting

## Security (4)

- **Lemlist Authentication** — http/apiKey/oauth2/openIdConnect · 4 schemes
- **Lemlist Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Lemlist Vulnerability Disclosure** — Hackerone
- **Lemlist Trust Center** — SOC 2 Type 2

## Plans (1)

- **Lemlist Plans Pricing**

## Tags

Email Outreach, Sales Engagement, Cold Email, Sales Automation, LinkedIn Outreach, Lead Generation, Data Enrichment, Deliverability, CRM, Multichannel Messaging, Webhook, MCP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/lemlist/). Scores are computed from the provider's own public artifacts under a published rubric.