Synthflow · Rate Limits

Synthflow Rate Limits

Synthflow documents two throttles, and both are call-shaped rather than request-shaped: Concurrent Active Calls (how many calls can be live at once) and CAPS, Call Attempts Per Second (how fast new calls can be started through the Make a Phone Call endpoint). Neither has a published number — both are scoped per account or shown in workspace/account terms. There is no documented general HTTP request rate limit for the other 99 operations, and no rate-limit response headers are published.

Synthflow Rate Limits is the machine-readable rate-limit profile for Synthflow on the APIs.io network, in the API Commons Rate Limits shape.

It captures 2 rate-limit definitions, measuring concurrent_calls and call_attempts_per_second.

Limit state is signalled in the limit, remaining, reset, and retryAfter response headers, and an exhausted limit returns HTTP 429.

The profile also includes response codes documented for throttled and note.

Tagged areas include Rate Limiting, Concurrency, CAPS, and Telephony.

2 Limits Exhausted: HTTP 429 limitremainingresetretryAfter
Transcribed from the provider's documentation on 2026-08-13 — docs.synthflow.ai/concurrency-calling-limits.
View Source
Rate LimitingConcurrencyCAPSTelephony

Limits

Concurrent Active Calls workspace
concurrent_calls · instantaneous
CAPS (Call Attempts Per Second) workspace
POST /v2/calls
call_attempts_per_second · second

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

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

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

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