Developer API

Integrate Addavox localization into your workflow. Choose the Video Dubbing API for full video localization with timing, QA, subtitles, and full access to the Review Editor through magic links. You can also choose any of the individual service APIs for other tasks, like narrating a book or translating and narrating a book in a single pass.

API Keys

API keys belong to an Addavox account. Create one with the Start localizing button above, then generate a key in the app — every call bills to that account.

Individual API services are paid from your credit balance, which you top up and manage in your Addavox account. Full video localization is the exception: it uses the same pricing as the plan you choose in Plans & Pricing — your plan's included minutes, then overage at the plan rate.

Planning an integration? Book an integration call (opens in a new tab)

Base URL: https://api.addavox.com/api/v1

Auth header: X-API-Key: YOUR_KEY

Consent & Authorization

All API requests must include a consent object and a top-level mode field. Together these create a per-job attestation record confirming you hold the necessary rights and speaker consents.

The mode field determines voice synthesis: "voice_matched" uses speaker voice cloning, "standard" uses synthetic TTS. Both modes are the same price — the choice is purely consent-driven.

Field	Type	Required	Description
mode	string	Top-level	`voice_matched` or `standard`
speaker_consent_obtained	boolean	voice_matched only	Explicit consent from identifiable speakers
content_rights_confirmed	boolean	Both modes	Ownership or valid license to the content
eula_accepted	boolean	Both modes	Accepts the Addavox EULA
attested_by	string	Both modes	Email or identifier of responsible party
attested_at	ISO 8601	Both modes	Within 24 hours of request time

HTTP	Code	Condition
403	CONSENT_MISSING	No consent object
403	CONSENT_INCOMPLETE	Missing attested_by or invalid attested_at
403	CONSENT_NOT_AFFIRMED	Rights or EULA not affirmed
403	CONSENT_EXPIRED	attested_at older than 24 hours
403	SPEAKER_CONSENT_REQUIRED	voice_matched without speaker consent
400	INVALID_MODE	Invalid mode value

API Reference

Full interactive schema and additional endpoints are available via OpenAPI.

Full Video Localization

POST /api/v1/localize-video API key

Video Dubbing

Full video dubbing: send a video URL + target languages, get localized videos back.

Request body

Field	Type	Required	Description
`video_url`	`string`	Yes	HTTPS URL of the source video to dub.
`target_languages`	`string[]`	Yes	One or more target language codes.
`source_language`	`string`	Yes	Language of the source video's spoken audio, e.g. 'en'.
`project_name`	`string \| null`	No	Optional project name. Defaults to 'API Video: {filename}'.
`enable_llm_qa`	`boolean`	No	Opt-in LLM quality-review pass over translations before voice synthesis. Adds processing time.
`mode`	`LocalizationMode`	No	Drives consent. Default 'voice_matched' (clones the speaker); 'standard' uses synthetic TTS.
`consent`	`ConsentAttestation`	Yes	Consent attestation; see Consent & Authorization.

Response

Field	Type	Description
`job_id`	`string`	Master job ID — poll for per-language status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`target_languages`	`string[]`	Echoed target language codes.

ConsentAttestation

`speaker_consent_obtained`	`boolean \| null`	Attests that explicit consent has been obtained from all identifiable speakers. Required for voice_matched mode only.
`content_rights_confirmed`	`boolean`	Attests ownership or a valid license to the content. Required in both modes.
`eula_accepted`	`boolean`	Confirms the client has read and accepts the Addavox EULA. Required in both modes.
`attested_by`	`string`	Email or identifier of the responsible individual or system.
`attested_at`	`string`	ISO 8601 timestamp of attestation. Must be within 24 hours of the request.

API Services

POST /api/v1/separate API key

Voice Separation

Split caller-supplied audio into vocals + background stems (async job).

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio to separate.
`project_name`	`string \| null`	No	Optional project name.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`charge`	`ChargeInfo`	Billing detail for this submission.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

POST /api/v1/transcribe API key

Transcribe

Transcribe caller-supplied audio and return a transcript (async job).

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio to transcribe.
`language`	`string`	Yes	Spoken language of the audio (BCP-47), e.g. 'en-US'.
`project_name`	`string \| null`	No	Optional project name.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`charge`	`ChargeInfo`	Billing detail for this submission.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

POST /api/v1/pro-transcribe API key

Pro Transcription

Separate, then transcribe the isolated vocals stem — a cleaner transcript (async job).

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio to transcribe.
`language`	`string`	Yes	Spoken language of the audio (BCP-47), e.g. 'en-US'.
`project_name`	`string \| null`	No	Optional project name.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`charge`	`ChargeInfo`	Billing detail for this submission.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

POST /api/v1/translate API key

Translate

Machine-translate text from one language to another. Returns the translated text synchronously — no audio, no job to poll.

Request body

Field	Type	Required	Description
`text`	`string`	Yes	Text to translate.
`target_language`	`string`	Yes	Target language code, e.g. 'es' or 'es-ES'.
`source_language`	`string`	Yes	Source language code, e.g. 'en' or 'en-US'.

Response

Field	Type	Description
`translated_text`	`string`	The translated text.
`source_language`	`string`	Source language supplied on the request.
`target_language`	`string`	Target language the text was translated into.
`charge`	`ChargeInfo`	Billing detail for this translation.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

Example

curl -X POST https://api.addavox.com/api/v1/translate \
      -H "X-API-Key: $ADDAVOX_KEY" -H "Content-Type: application/json" \
      -d '{"text": "Hello", "target_language": "es"}'

POST /api/v1/narrate API key

Narrate

Narrate already-translated text into an audiobook, in a preset voice you choose. Preset (synth) voices only — no voice matching.

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio; also used to identify/match speaker voices.
`source_language`	`string`	Yes	Source language code, e.g. 'en-US'.
`target_language`	`string`	Yes	Target language code, e.g. 'es-ES'.
`segments`	`ExternalSegment[]`	Yes	The pre-segmented transcript to voice.
`project_name`	`string \| null`	No	Optional project name. Defaults to 'API: {source}->{target}'.
`consent`	`ConsentAttestation`	Yes	Consent attestation; see Consent & Authorization.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`voice_type`	`string`	Voice type resolved from the request mode.
`total_segments`	`integer`	Echoed count of submitted segments.
`charge`	`ChargeInfo`	Billing detail for this submission.

ExternalSegment

`source_text`	`string`	Original text for this segment.
`start_time`	`number`	Segment start, in seconds. Used for speaker-voice matching only, not output timing.
`end_time`	`number`	Segment end, in seconds. Used for speaker-voice matching only, not output timing.
`words`	`object[]`	Word-level timing; defaults to empty.
`speaker`	`object \| null`	Speaker metadata for voice selection.
`translated_text`	`string \| null`	Pre-supplied translation. If provided, translation is skipped for this segment.

ConsentAttestation

`speaker_consent_obtained`	`boolean \| null`	Attests that explicit consent has been obtained from all identifiable speakers. Required for voice_matched mode only.
`content_rights_confirmed`	`boolean`	Attests ownership or a valid license to the content. Required in both modes.
`eula_accepted`	`boolean`	Confirms the client has read and accepts the Addavox EULA. Required in both modes.
`attested_by`	`string`	Email or identifier of the responsible individual or system.
`attested_at`	`string`	ISO 8601 timestamp of attestation. Must be within 24 hours of the request.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

POST /api/v1/translate-narrate API key

Translate + Narrate — preset voice

Translate your text to the target language and narrate it in a preset voice. Source and target language must differ.

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio; also used to identify/match speaker voices.
`source_language`	`string`	Yes	Source language code, e.g. 'en-US'.
`target_language`	`string`	Yes	Target language code, e.g. 'es-ES'.
`segments`	`ExternalSegment[]`	Yes	The pre-segmented transcript to voice.
`project_name`	`string \| null`	No	Optional project name. Defaults to 'API: {source}->{target}'.
`consent`	`ConsentAttestation`	Yes	Consent attestation; see Consent & Authorization.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`voice_type`	`string`	Voice type resolved from the request mode.
`total_segments`	`integer`	Echoed count of submitted segments.
`charge`	`ChargeInfo`	Billing detail for this submission.

ExternalSegment

`source_text`	`string`	Original text for this segment.
`start_time`	`number`	Segment start, in seconds. Used for speaker-voice matching only, not output timing.
`end_time`	`number`	Segment end, in seconds. Used for speaker-voice matching only, not output timing.
`words`	`object[]`	Word-level timing; defaults to empty.
`speaker`	`object \| null`	Speaker metadata for voice selection.
`translated_text`	`string \| null`	Pre-supplied translation. If provided, translation is skipped for this segment.

ConsentAttestation

`speaker_consent_obtained`	`boolean \| null`	Attests that explicit consent has been obtained from all identifiable speakers. Required for voice_matched mode only.
`content_rights_confirmed`	`boolean`	Attests ownership or a valid license to the content. Required in both modes.
`eula_accepted`	`boolean`	Confirms the client has read and accepts the Addavox EULA. Required in both modes.
`attested_by`	`string`	Email or identifier of the responsible individual or system.
`attested_at`	`string`	ISO 8601 timestamp of attestation. Must be within 24 hours of the request.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

POST /api/v1/translate-narrate-matched API key

Translate + Narrate — matched voice

Translate your text to the target language and narrate it in a voice matched from a ≥1-minute audio sample you provide. Source and target language must differ.

Request body

Field	Type	Required	Description
`audio_url`	`string`	Yes	HTTPS URL of the source audio; also used to identify/match speaker voices.
`source_language`	`string`	Yes	Source language code, e.g. 'en-US'.
`target_language`	`string`	Yes	Target language code, e.g. 'es-ES'.
`segments`	`ExternalSegment[]`	Yes	The pre-segmented transcript to voice.
`project_name`	`string \| null`	No	Optional project name. Defaults to 'API: {source}->{target}'.
`consent`	`ConsentAttestation`	Yes	Consent attestation; see Consent & Authorization.

Response

Field	Type	Description
`job_id`	`string`	Poll this job ID for status.
`project_id`	`string`	The project created for this job.
`status`	`string`	Always 'queued' on submit.
`voice_type`	`string`	Voice type resolved from the request mode.
`total_segments`	`integer`	Echoed count of submitted segments.
`charge`	`ChargeInfo`	Billing detail for this submission.

ExternalSegment

`source_text`	`string`	Original text for this segment.
`start_time`	`number`	Segment start, in seconds. Used for speaker-voice matching only, not output timing.
`end_time`	`number`	Segment end, in seconds. Used for speaker-voice matching only, not output timing.
`words`	`object[]`	Word-level timing; defaults to empty.
`speaker`	`object \| null`	Speaker metadata for voice selection.
`translated_text`	`string \| null`	Pre-supplied translation. If provided, translation is skipped for this segment.

ConsentAttestation

`speaker_consent_obtained`	`boolean \| null`	Attests that explicit consent has been obtained from all identifiable speakers. Required for voice_matched mode only.
`content_rights_confirmed`	`boolean`	Attests ownership or a valid license to the content. Required in both modes.
`eula_accepted`	`boolean`	Confirms the client has read and accepts the Addavox EULA. Required in both modes.
`attested_by`	`string`	Email or identifier of the responsible individual or system.
`attested_at`	`string`	ISO 8601 timestamp of attestation. Must be within 24 hours of the request.

ChargeInfo

`amount`	`number`	Total amount charged for this submission, in USD.
`rate_per_min`	`number`	Per-minute rate applied.
`duration_min`	`number`	Billed minutes (for text services, characters/1000).
`num_languages`	`integer`	Number of target languages billed.
`credit_balance_after`	`number`	Account credit balance after the charge, in USD.

Jobs & Results

GET /api/v1/jobs/{job_id} API key

Job Status

Check the status of an external localization job.

Response

Field	Type	Description
`job_id`	`string`	Echoes the job ID from the URL.
`type`	`string`	Job type: voice \| translate_voice \| transcribe_translate_voice \| video_dub.
`status`	`string`	queued \| running \| completed \| failed. For a video_dub job this is a true aggregate of its per-language children, not a per-child value.
`total_segments`	`integer`	Total segment count. Always 0 on a video_dub master job.
`completed_segments`	`integer`	Completed segment count. Always 0 on a video_dub master job.
`error`	`string \| null`	Failure message when status is 'failed'.

GET /api/v1/jobs/{job_id}/result API key

Job Result

Get the download URL for a completed external localization job.

Response

Field	Type	Description
`transcript_url`	`string \| null`	(Transcription job) Signed URL of the transcript JSON.
`vocals_url`	`string \| null`	(Separation job) Signed URL of the vocals stem.
`background_url`	`string \| null`	(Separation job) Signed URL of the background stem.
`download_url`	`string \| null`	Signed URL (24h). Single voice track for an audio job, or a zip of all languages for a video dub.
`duration`	`number \| null`	(Audio job) Duration in seconds.
`file_size`	`integer \| null`	(Audio job) File size in bytes.
`project_id`	`string \| null`	(Video dub) The project ID.
`review_url`	`string \| null`	(Video dub) Web review URL for the project.
`languages`	`VideoJobResultLanguage[] \| null`	(Video dub) Per-language result URLs.

VideoJobResultLanguage

`language`	`string`	Target language code for this result.
`video_url`	`string \| null`	Signed URL of the dubbed video (24h expiry).
`audio_url`	`string \| null`	Signed URL of the dubbed audio track (24h expiry).
`subtitle_url`	`string \| null`	Signed URL of the subtitle file (24h expiry).

DELETE /api/v1/jobs/{job_id} API key

Cancel Job

Cancel a queued or running job and refund the charge to the account balance.

Response

Field	Type	Description
`job_id`	`string`	Echoes the cancelled job ID.
`status`	`string`	Always 'cancelled'.
`refunded_amount`	`number`	Amount refunded for the undelivered work, in USD.

GET /api/v1/jobs API key

List Jobs

List localization jobs for the authenticated account. Query params: status — filter by queued | running | completed | failed | cancelled limit — max results (default 20, max 100) offset — pagination offset (default 0)

Response

Field	Type	Description
`jobs`	`JobListItem[]`	The page of jobs, newest first.
`total`	`integer`	Total jobs matching the query, across all pages.
`limit`	`integer`	Page size used.
`offset`	`integer`	Page offset used.

JobListItem

`job_id`	`string`	Job ID.
`project_id`	`string`	Project the job belongs to.
`type`	`string`	Job type.
`target_language`	`string \| null`	Target language code, if applicable.
`status`	`string`	queued \| running \| completed \| failed \| cancelled.
`total_segments`	`integer`	Total segment count.
`completed_segments`	`integer`	Completed segment count.
`error`	`string \| null`	Failure message when the job failed.
`created_at`	`string \| null`	ISO 8601 creation time.
`started_at`	`string \| null`	ISO 8601 start time, if started.
`completed_at`	`string \| null`	ISO 8601 completion time, if finished.
`charge`	`JobListCharge \| null`	Charge summary, present if the job was billed.

GET /api/v1/jobs/{job_id}/webhooks API key

Webhook Log

Return the webhook delivery log for a job (all attempts, newest first).

Response

Field	Type	Description
`job_id`	`string`	Echoes the job ID from the URL.
`deliveries`	`WebhookDelivery[]`	All delivery attempts for the job, newest first.

WebhookDelivery

`id`	`string \| null`	Delivery attempt ID.
`event`	`string \| null`	Event type delivered, e.g. 'job.completed'.
`attempt`	`integer \| null`	Attempt number for this event.
`status_code`	`integer \| null`	HTTP status returned by the endpoint, if any.
`error`	`string \| null`	Delivery error, if the attempt failed.
`delivered_at`	`string \| null`	ISO 8601 time of the attempt.

POST /api/v1/jobs/{job_id}/webhooks/retry API key

Retry Webhook

Re-trigger webhook delivery for the most recent event on a job.

Response

Field	Type	Description
`status`	`string`	Always 'queued' — the event was re-queued for delivery.
`event`	`string`	The event type that was re-queued.

Account & Reference

GET /api/v1/account API key

Account

Return credit balance and current plan for the authenticated account.

Response

Field	Type	Description
`account_id`	`string`	The account's ID.
`credit_balance`	`number`	Prepaid credit balance, in USD.
`plan_id`	`string`	Current plan ID, e.g. 'free', 'creator'.
`plan_name`	`string`	Human-readable plan name.
`included_minutes`	`integer`	Localization minutes included in the plan per period.
`minutes_used`	`number`	Included minutes used this period.
`minutes_remaining`	`number`	Included minutes remaining this period.
`overage_rate`	`number`	Per-minute overage rate once included minutes are exhausted, in USD.
`billing_interval`	`string \| null`	'monthly' or 'annual'; null on the free plan.
`subscription_status`	`string`	Subscription status, e.g. 'active', 'past_due', 'free'.

GET /api/v1/voices API key

List Voices

Return available voices for a given language code. Query params: language — BCP-47 code, e.g. 'en-US', 'es-ES' (required) gender — optional filter: MALE | FEMALE

GET /api/v1/languages API key

List Languages

Return supported languages. Query params: detail — if true, include provider metadata per language

POST /api/v1/projects/{project_id}/reviewers API key

Invite Reviewer

Invite a reviewer to a project (API endpoint).

Request body

Field	Type	Required	Description
`name`	`string`	Yes	Reviewer's display name, used in the invite email.
`email`	`string`	Yes	Where the magic-link invite is sent.
`language`	`string`	Yes	Target language code the reviewer will edit.

Response

Field	Type	Description
`id`	`string`	New reviewer ID.
`name`	`string`	Echoed from the request.
`email`	`string`	Echoed from the request.
`token`	`string`	Magic-link token, embedded in the emailed URL. Expires 7 days from creation.
`expires_at`	`string \| null`	Currently always null — not populated by this call.

API Service Pricing

Individual services are billed per minute and are not part of a plan — you pay only for what you call, at one flat rate with no annual discount. Only full video localization draws on a plan's included minutes. Text-based services meter at roughly 1,000 characters per minute.

Service	What you send → what you get	Rate
Voice Separation	Audio → clean voice + background tracks	$0.02/min
Transcription (STT)	Audio → text transcript with punctuation and word-level timing	$0.02/min
Pro Transcription	Audio → Voice Separation + Transcription (STT), best for noisy audio	$0.05/min
Translation	Text → translated text	$0.02/min
Narrate (TTS)	Text → narrated audio in a preset voice	$0.03/min
Narrate (TTS)	Translated text → narrated audio in a preset voice you choose	$0.03/min
Translate + Narrate — preset voice	Text → translated, then narrated in a preset voice	$0.06/min
Translate + Narrate — matched voice	Text + a ≥1-min voice sample → translated, then narrated in the matched voice. Source and target language must differ.	$0.08/min
Translate + Narrate — preset voice	Text → translated, then narrated in a preset voice. Source and target language must differ.	$0.06/min
Translate + Narrate — matched voice	Text + a ≥1-min voice sample → translated, then narrated in the matched voice. Source and target language must differ.	$0.08/min

Full video localization is the one API service tied to a plan: it draws on your plan's included minutes, then overage at the plan rate. See plans and pricing

API Keys

Consent & Authorization

Voice-Matched Mode — Full Consent Required

Standard Mode — Content Rights Only

Field Reference

Consent Error Codes

API Reference

Full Video Localization

Video Dubbing

API Services

Voice Separation

Transcribe

Pro Transcription

Translate

Narrate

Translate + Narrate — preset voice

Translate + Narrate — matched voice

Jobs & Results

Job Status

Job Result

Cancel Job

List Jobs

Webhook Log

Retry Webhook

Account & Reference

Account

List Voices

List Languages

Invite Reviewer

API Service Pricing