SendGrid · Rate Limits

Sendgrid Rate Limits

SendGrid v3 rate limiting, read from the published "Rate Limits" page of the v3 API reference on 2026-08-13. THE RUNTIME SIGNAL IS DOCUMENTED; THE NUMBERS ARE NOT. SendGrid returns three rate-limit headers on every response and a 429 on exhaustion, and an agent should drive entirely off those headers — because SendGrid publishes no per-endpoint or per-account numeric limit table. The values that appear on the docs page (500, 150) are illustrative examples inside a sample response, not a committed limit. Limits are described as "a fixed number of requests per refresh period" that varies by endpoint and plan.

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

The profile also includes 3 backoff/retry policies defined and response codes documented for throttled.

Tagged areas include Rate Limiting and Email.

0 Limits Throttle: 429
Rate LimitingEmail

Policies

IP warm-up
Dedicated IPs must be ramped gradually; SendGrid provides an IP Warmup API (openapi/sendgrid-ip-warmup-api-openapi.yml) and automated warmup schedules. This is a deliverability throttle, distinct from API rate limiting.
Reputation throttling
Bounce and complaint rates can trigger ISP-level throttling of delivery independent of any API rate limit. See skills/sendgrid-deliverability-advisor.md and the Engagement Quality API.
Plan-tier sending quotas
Monthly/daily email volume is bounded by the plan (see plans/sendgrid-plans-pricing.yml); exceeding it triggers overage billing, not a 429.

Sources

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

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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.
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Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/sendgrid-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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