OptinMonster

OptinMonster REST API

The OptinMonster application REST API. Versioned path segments (`/v1`, `/v2`) sit on api.optinmonster.com and cover campaigns, leads, sites, site origins, integrations, account, revenue attribution and the public template catalog. Authenticated with an account API key supplied in the `X-OptinMonster-ApiKey` header (legacy `omapi-key` + user pairing is still accepted). Responses are JSON; errors use a consistent `{error, code, message, status}` envelope with numeric OptinMonster codes.

GitHub

Documentation

📖
Authentication
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/authentication/optinmonster-authentication.yml
📖
RateLimits
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/rate-limits/optinmonster-rate-limits.yml

Other Resources

🔗
ErrorCatalog
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/errors/optinmonster-problem-types.yml
🔗
Conventions
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/conventions/optinmonster-conventions.yml
🔗
DataModel
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/data-model/optinmonster-data-model.yml
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/optinmonster/refs/heads/main/apis.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/optinmonster-rest-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑ 
aid: optinmonster-rest-api
name: OptinMonster REST API
description: The OptinMonster application REST API. Versioned path segments (`/v1`, `/v2`) sit on api.optinmonster.com
  and cover campaigns, leads, sites, site origins, integrations, account, revenue attribution and the
  public template catalog. Authenticated with an account API key supplied in the `X-OptinMonster-ApiKey`
  header (legacy `omapi-key` + user pairing is still accepted). Responses are JSON; errors use a consistent
  `{error, code, message, status}` envelope with numeric OptinMonster codes.
humanURL: https://optinmonster.com/docs/
baseURL: https://api.optinmonster.com/v2
tags:
- Lead Generation
- Campaigns
- Marketing
properties:
- type: Authentication
  url: authentication/optinmonster-authentication.yml
- type: ErrorCatalog
  url: errors/optinmonster-problem-types.yml
- type: Conventions
  url: conventions/optinmonster-conventions.yml
- type: RateLimits
  url: rate-limits/optinmonster-rate-limits.yml
- type: DataModel
  url: data-model/optinmonster-data-model.yml