Listnr · Rate Limits

Listnr Rate Limits

Listnr does not publish fixed numeric per-request rate limits for the Text-to-Speech API. In practice, usage is bounded by your subscription's monthly voice-generation credit allowance (words/characters synthesized) rather than by a documented requests-per-second or requests-per-minute cap. Long conversions are handled through the asynchronous endpoints (convert-text-async / convert-url-async), which return a jobId that clients poll via job-status until the job reaches COMPLETED or FAILED, so throughput for large jobs is governed by queue processing rather than a synchronous rate limit.

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

It captures 3 rate-limit definitions, measuring requests, credits, and jobs.

An exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

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

Tagged areas include AI, Text to Speech, TTS, Voice, and Rate Limiting.

3 Limits Exhausted: HTTP 429
Method: generated, dated 2026-07-11.
Written by API Evangelist on 2026-07-11 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
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AIText to SpeechTTSVoiceRate LimitingQuotas

Limits

Text-to-Speech API Requests account
requests
not published
No fixed numeric request-rate limit is documented for the TTS API.
Monthly Voice-Generation Credits account
credits
per plan
Usage is capped by the plan's monthly credit allowance (e.g. 1,000 free words, 20,000 / 50,000 / 250,000 credits on Individual / Solo / Agency).
Asynchronous Job Processing account
jobs
queue-bound
Large conversions run via the async endpoints and are polled with job-status; effective throughput depends on queue processing, not a synchronous rate cap.

Policies

Credit-Based Quota
Requests draw down a monthly credit allowance tied to the subscription plan rather than a per-minute request budget.
Async for Large Jobs
Use convert-text-async / convert-url-async for long inputs and poll job-status; sync endpoints are best for short text.
Backoff Strategy
Clients should implement exponential backoff with jitter and honor Retry-After on any 429 response.

Sources

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