Plain · Rate Limits

Plain Support Rate Limits

Plain enforces rate limits on its GraphQL API at the workspace / API key level. Limits are applied per Machine User API key and are expressed as requests per unit time against the single POST /graphql/v1 endpoint; exceeding them returns an error (HTTP 429 / a RATE_LIMITED mutation error). Specific numeric thresholds are not published as fixed public values and are not reconciled in this artifact - confirm current limits with Plain.

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

It captures 3 rate-limit definitions, measuring requests, mutations, and deliveries.

The profile also includes 2 backoff/retry policies defined and response codes documented for throttled.

Tagged areas include Customer Support, Help Desk, GraphQL, API First, and Rate Limiting.

3 Limits Throttle: 429
Customer SupportHelp DeskGraphQLAPI FirstRate LimitingQuotasThrottling

Limits

GraphQL Requests api_key
requests
see provider documentation
Per API key (Machine User) against POST /graphql/v1; varies by workspace and plan.
Mutation Operations api_key
mutations
see provider documentation
Write operations (upsertCustomer, createThread, replyToThread, etc.) are rate limited per key.
Webhook Deliveries workspace
deliveries
see provider documentation
Outbound webhook delivery attempts; failed deliveries are retried and inspectable.

Policies

Tiered / Workspace Limits
Limits are applied per API key and may vary by workspace and plan; contact Plain to raise them.
Backoff Strategy
Clients should implement exponential backoff with jitter on HTTP 429 and RATE_LIMITED mutation errors.

Sources

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/plain-support-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 email required.

GitHub Google LinkedIn

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