generated: '2026-08-13'
method: searched
source: >-
  https://api-doc.simpletexting.com/ (the v2 reference and its embedded OpenAPI),
  https://simpletexting.com/api/docs/, plus live unauthenticated probes of
  https://api-app2.simpletexting.com/v2 on 2026-08-13 to observe response headers.
specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: SimpleTexting
providerId: simpletexting
created: '2026-06-20'
modified: '2026-06-20'
reconciled: false
tags:
- SMS
- MMS
- Messaging
- Marketing
- Text Messaging
- Rate Limiting
- Quotas
- Throttling
description: >-
  SimpleTexting's API enforces request throttling and message-sending
  throughput limits. Outbound message throughput (messages per second) is
  governed by the type and registration status of the sending number
  (toll-free, 10DLC local, or short code) and the associated carrier
  approval, rather than a single documented API quota. Webhooks accept a
  configurable requestPerSecLimit to cap callback delivery rate. Specific
  numeric request-per-second and per-minute API limits are not published in
  the public API reference and are not reconciled in this artifact.
notes: >-
  Confirm current per-account API request limits, message throughput per
  number type, and 10DLC / toll-free campaign throughput allowances with
  SimpleTexting support or in-app during reconciliation; values vary by
  number type, carrier registration, and plan.
sources:
- https://api-doc.simpletexting.com/
- https://simpletexting.com/api/docs/
- https://simpletexting.com/api/
limit_count: 2
responseHeaders:
  observed: none
  probed: '2026-08-13'
  probe: GET https://api-app2.simpletexting.com/v2/api/messages (unauthenticated)
  detail: >-
    The response carried Server, Date, Content-Type, Connection,
    Strict-Transport-Security and CORS headers only. No RateLimit-*, no
    X-RateLimit-*, no Retry-After. An agent has no runtime signal to back off on.
responseCodes:
  throttled: not documented
  note: >-
    SimpleTexting's published OpenAPI declares no 429 response on any of its 38
    operations, and the reference does not name a throttling status code. A prior
    revision of this artifact asserted 429; that was an assumption and has been
    removed. Treat exhaustion behaviour as unknown until observed under load.
limits:
- name: Page size
  scope: endpoint
  metric: items per request
  limit: 500
  window: per request
  published: true
  notes: >-
    The only hard numeric limit SimpleTexting publishes for the API itself — the
    `size` query parameter on every list operation has maximum 500, default 50
    (OpenAPI parameter schema).
- name: Webhook delivery rate
  scope: webhook subscription
  metric: requests
  limit: 25
  window: per second
  published: true
  notes: >-
    `requestPerSecLimit` on a webhook subscription, maximum 25 (OpenAPI
    WebhookRequest schema). This caps how fast SimpleTexting calls YOUR endpoint;
    it is not a limit on your calls to SimpleTexting.
- name: API request rate
  scope: account
  metric: requests
  limit: not published
  published: false
  notes: >-
    No per-account or per-key request quota appears anywhere in the public
    reference, and no header exposes one at runtime.
- name: Message throughput (MPS)
  scope: sending number
  metric: messages
  limit: not published
  published: false
  notes: >-
    Outbound throughput is governed by sending number type (toll-free, 10DLC local,
    short code) and carrier registration status rather than by an API quota.
    SimpleTexting publishes no numeric MPS figure per number type.
policies:
- name: Number-Based Throughput
  description: Sending throughput depends on number type and 10DLC / toll-free registration status; registered campaigns receive higher throughput.
- name: Backoff Strategy
  description: >-
    Because no limit, status code or Retry-After header is published, clients should
    apply conservative exponential backoff with jitter on any non-2xx and must NOT
    blind-retry message or campaign sends — the API has no idempotency key, so a
    retry can bill a second send (conventions/simpletexting-conventions.yml).
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com