Blueshift · Rate Limits

Blueshift Rate Limits

Blueshift's API rate limiting is advisory prose, not a runtime contract. There are published throughput recommendations on the bulk endpoints and hard batch caps enforced with 413, but the API returns NO rate-limit headers of any kind — no X-RateLimit-*, no RateLimit-*, no Retry-After. A client discovers it has exceeded the limit only by receiving a 429 with a one-line message, and then has to guess the backoff. Note also that the article most people find when searching "Blueshift rate limiting" is about MESSAGE-SENDING throughput (campaign, channel and user-level message caps), which is a different concept from API request limits; both are recorded here and kept separate.

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

It captures 6 rate-limit definitions.

Tagged areas include Customer Data Platform, Customer Engagement, Marketing Automation, Cross-Channel Messaging, and Email.

6 Limits
Customer Data PlatformCustomer EngagementMarketing AutomationCross-Channel MessagingEmailSMSPush NotificationsSegmentationPersonalizationProduct RecommendationsEvent TrackingProduct CatalogMarTechMCPagent-native

Limits

Bulk events throughput per-account
5 bulk calls per second (~150 events per second)
Bulk customers throughput per-account
5 bulk calls per second (~250 users per second)
Bulk customers payload cap per-request
50 customers
Catalog items payload cap per-request
100 items
Custom user list bulk cap per-request
25 users, or 500 when async=true
Bulk email validation cap per-request
30 email addresses

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/blueshift-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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