API keys can now enforce monthly USD spend limits
Speechify API keys can now carry a monthly USD spend limit, returning 402 spend_cap_exceeded once a key reaches its budget for the calendar month.
Luke Oliff
Platform release notes
Major changes to the SpeechifyAI platform — cross-product features, infrastructure milestones, and the kind of work that doesn't fit cleanly under either product's own changelog. Written by humans, not generators.
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TTS now accepts sample-rate and bitrate-specific output formats
Speechify TTS speech and streaming endpoints now accept output_format values like pcm_16000, ulaw_8000, and bitrate-tuned mp3 variants without changing existing callers.
Luke Oliff
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The API now exposes more safety limits at the edge
Speechify added rate-budget response headers, global JSON body-size handling, clearer 413 and 415 errors, and pre-auth IP throttling for token-mint paths.
Luke Oliff
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Workspace webhooks now have endpoint management and versioned payloads
Speechify workspace webhooks now support managed endpoints, delivery history, a resource.action event catalog, combined signatures, and per-endpoint API versions.
Luke Oliff
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API keys now carry clearer scopes and usage attribution
Speechify API keys now have cleaner scope tiers, service-account inheritance, and usage attribution that makes spend easier to trace back to a workload.
Luke Oliff
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Service accounts are now machine identities for the Speechify API
Service accounts give Speechify API workloads their own identity, scope ceiling, key rotation flow, usage attribution, and short-lived child keys for agent sessions.
Luke Oliff
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Build and Agents API fields moved toward one naming shape
Build and Agents received a small API naming cleanup on June 28, including not_specified voice gender and several Agents field-name migrations.
Luke Oliff
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GET /v1/voices now returns a pagination-ready envelope
The Build API moved GET /v1/voices from a bare array to a voices object with pagination fields, making the response shape safer for SDKs and future growth.
Luke Oliff
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Idempotency-Key is now wired across side-effect API calls
Speechify now supports Idempotency-Key on the API calls most likely to be retried, including calls, batches, purchases, spend paths, and service-account key minting.
Luke Oliff
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Speechify-Version gives API clients a stable date pin
Speechify APIs now support the Speechify-Version header, so HTTP clients can pin a dated contract while SDKs send their build-date version automatically.
Luke Oliff
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TTS stream responses are documented as raw audio streams
The Build docs now spell out that POST /v1/audio/stream returns chunked raw audio, not JSON, with clearer response content types and codec notes.
Luke Oliff
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Agents now expose live operations APIs for analytics and intervention
Speechify Agents added live transcript streaming, take-over actions, per-action RBAC, analytics queries, and saved dashboard APIs for monitoring live voice operations.
Luke Oliff
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Voice Agents API is now public beta
Speechify Voice Agents is now publicly documented, with guides and API reference pages for agents, conversations, tools, knowledge bases, calls, and monitoring.
Luke Oliff