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lemlist Sequences API

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

lemlist Sequences API is one of 22 APIs that lemlist publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Sequences. The published artifact set on APIs.io includes an OpenAPI specification.

This API exposes 9 operations across 5 paths. It is described by OpenAPI 3.2.0, at version 1.0.0.

Requests are made against a single base URL, https://api.lemlist.com/api.

9 operations 5 paths 0 schemas 2 DELETE2 GET2 PATCH3 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0.0
Base URL
https://api.lemlist.com/api
Authentication
HTTP Basic
Resource Areas
1

Authentication & Security 1

lemlist Sequences API declares 1 security scheme for authenticating requests. It accepts HTTP basic authentication (basicAuth).

Paths & Operations 9

Across 5 paths, the API surfaces 9 operations — 2 DELETE, 2 GET, 2 PATCH, 3 POST. Each is listed below with its method, path, parameters, and response codes.

Sequences 9
GET
/campaigns/{campaignId}/sequences
Retrieve campaign sequences
2 params → 200
POST
/sequences/{sequenceId}/steps
Add step to sequence
2 params body → 200
PATCH
/sequences/{sequenceId}/steps/{stepId}
Update sequence step
3 params body → 200
DELETE
/sequences/{sequenceId}/steps/{stepId}
Delete sequence step
3 params body → 200
POST
/sequences/{sequenceId}/steps/{stepId}/ab-test
Create A/B Test Variant
2 params → 200400401402404405
GET
/sequences/{sequenceId}/steps/{stepId}/ab-test
Get A/B Test Variant
2 params → 200401402404405
PATCH
/sequences/{sequenceId}/steps/{stepId}/ab-test
Update A/B Test Variant
2 params body → 200400401402404405
DELETE
/sequences/{sequenceId}/steps/{stepId}/ab-test
Delete A/B Test Variant
3 params → 200400401402404405
POST
/sequences/{sequenceId}/steps/{stepId}/ab-test/winner
Select A/B Test Winner
2 params body → 200400401402404405

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

lemlist-sequences-api-openapi.yml Raw ↑

Other APIs lemlist publishes across the network.

lemlist MCP Server
lemlist Campaigns API
lemlist Leads API
lemlist People Database API
lemlist Enrich API
lemlist Inbox API
lemlist Contacts API
lemlist Companies API
lemlist Signal Agents API
lemlist Webhooks API
lemlist Unsubscribes API
lemlist Schedules API
Where this information came from

This is an independent, third-party profile of lemlist Sequences API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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