Sinch · Rate Limits

Sinch Rate Limits

Published limits are per product. The Conversation API reference states a project-wide request rate and a per-app ingress queue drain rate; other products document the 429 behaviour without a number, except Number Lookup v2 (10 rps, recorded under additional_documented_limits with its own page because check-economics verifies every limit_text against this file's single source page).

Sinch Rate Limits is the rate-limit profile for Sinch on the APIs.io network — every limit transcribed verbatim from the provider’s own documentation on 2026-10-08.

It captures 2 rate-limit definitions, including Conversation API project request rate — Projects are limited to 800 requests per second across all apps and most endpoints.; Conversation API app MT ingress queue drain — Conversation API apps have a maximum MT ingress queue size of 500000 messages, which are drained towards the channel at a rate of 20 messages per second by default.

Limit state is signalled in the documented and note response headers.

Tagged areas include Communications, Messaging, SMS, Voice, and Verification.

2 Limits documentednote
Transcribed from the provider's documentation on 2026-10-08 — developers.sinch.com/docs/conversation/api-reference/conv....
View Source
CommunicationsMessagingSMSVoiceVerificationCPaaSTelecommunicationsWhatsApp

Limits

Conversation API project request rate per-project
Projects are limited to 800 requests per second across all apps and most endpoints.
· per second
800
Conversation API app MT ingress queue drain per-app
Conversation API apps have a maximum MT ingress queue size of 500000 messages, which are drained towards the channel at a rate of 20 messages per second by default
· per second
20

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

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