Campaign Monitor · Rate Limits

Campaignmonitor Rate Limits

Rate limiting for the Campaign Monitor API. Campaign Monitor limits only its /transactional endpoints and does not publish the numeric ceiling — it publishes the runtime signal instead (three X-RateLimit-* response headers and a 429), which is what an agent actually needs. The rest of the REST surface carries no published limit. Volume ceilings that DO bite in practice are per-operation batch caps and plan-level send caps, recorded below.

Campaignmonitor Rate Limits is the machine-readable rate-limit profile for Campaign Monitor on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 2 rate-limit definitions.

Tagged areas include Email Marketing, Campaigns, Subscribers, Transactional Email, and Segments.

2 Limits
Email MarketingCampaignsSubscribersTransactional EmailSegmentsNewslettersAutomationMarketing AutomationWebhookEmail DeliverabilityMarketing

Limits

Transactional endpoint rate limit per API key / OAuth token
Exceeding the limit returns HTTP 429 with the body {"Code": 429, "Message": "Rate limit exceeded"}. Clients should back off for X-RateLimit-Reset seconds.
Standard REST endpoints
No documented hard limit. The rate-limit headers are documented only in the context of /transactional. Absence of a published limit is not a guarantee of no limit.

Work with this as data

Every rate limit 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 rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • 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 rate limit 
curl "https://apis.io/api/v1/rate-limits/campaignmonitor-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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