How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Need help?

Contact us
Fixie

Fixie voices API

The voices API from Fixie — 4 operation(s) for voices.

Documentation Provider Profile APIs.io OpenAPI GitHub

Fixie voices API is one of 14 APIs that Fixie publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include Voices. The published artifact set on APIs.io includes an OpenAPI specification, authentication docs, and an AsyncAPI specification.

This API exposes 8 operations across 4 paths, and defines 15 schemas. It is described by OpenAPI 3.0.3, at version 0.1.0.

Requests are made against a single base URL, https://api.ultravox.ai.

8 operations 4 paths 15 schemas 1 DELETE3 GET1 PATCH2 POST1 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.3
API Version
0.1.0
Base URL
https://api.ultravox.ai/api
Authentication
API Key
Resource Areas
1

Authentication & Security 1

Fixie voices API declares 1 security scheme for authenticating requests. An API key is passed in the header as X-API-Key (apiKeyAuth).

  • apiKeyAuth — API key

Paths & Operations 8

Across 4 paths, the API surfaces 8 operations — 1 DELETE, 3 GET, 1 PATCH, 2 POST, 1 PUT. Each is listed below with its method, path, parameters, and response codes.

voices 8
POST
/api/voice_preview
Performs a test generation of a voice, returning the resulting audio or error.
preview_voice body → 200400
GET
/api/voices
List all voices in your account.
voices_list 7 params → 200
POST
/api/voices
Create a new cloned voice from an audio sample. The created voice will be private to your account.
voices_create body → 201
GET
/api/voices/{voice_id}
voices_retrieve 1 param → 200
PUT
/api/voices/{voice_id}
voices_update 1 param body → 200
PATCH
/api/voices/{voice_id}
voices_partial_update 1 param body → 200
DELETE
/api/voices/{voice_id}
voices_destroy 1 param → 204
GET
/api/voices/{voice_id}/preview
Provides an audio sample for a voice, or the error caused by using it.
voices_preview_retrieve 1 param → 200302400

Schemas 15

The contract defines 15 schemas that model the data the API accepts and returns. The most detailed are ultravox.v1.ElevenLabsVoice (11 properties), ultravox.v1.RespeecherVoice (10 properties), Voice (10 properties), PatchedVoice (10 properties). Each schema is shown below with its type and property counts.

ultravox.v1.ElevenLabsVoice_PronunciationDictionaryReference
object
A reference to a pronunciation dictionary within ElevenLabs.
2 properties
ultravox.v1.InworldVoice
object
Specification for a voice served by Inworld.
5 properties
ultravox.v1.LmntVoice
object
Specification for a voice served by LMNT.
4 properties
ultravox.v1.GoogleVoice
object
Specification for a voice served by Google. This implementation uses bidirectional streaming, so voices prior to Chirp3 are not supported.
2 properties
ultravox.v1.GenericVoice
object
Specification for a voice served by some generic REST-based TTS API. The API must accept an application/json POST request (as defined below) and return either…
8 properties
PatchedVoice
object
10 properties
ultravox.v1.ElevenLabsVoice
object
Specification for a voice served by ElevenLabs.
11 properties
OwnershipEnum
string
BillingStyleEnum
string
ultravox.v1.CartesiaVoice
object
Specification for a voice served by Cartesia. See https://docs.cartesia.ai/api-reference/tts/websocket
6 properties
ultravox.v1.CartesiaVoice_CartesiaGenerationConfig
object
Cartesia generation configuration for Sonic-3 and later models.
4 properties
PaginatedVoiceList
object
4 properties 1 required
Voice
object
10 properties 8 required
ultravox.v1.RespeecherVoice
object
Specification for a voice served by Respeecher. See https://space.respeecher.com/docs/api/tts/sampling-params-guide for parameter guidance.
10 properties
ultravox.v1.ExternalVoice
object
A voice not known to Ultravox Realtime that can nonetheless be used for a call. Such voices are significantly less validated than normal voices and you'll be r…
7 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

fixie-voices-api-openapi.yml Raw ↑

Other APIs Fixie publishes across the network.

Fixie accounts API
AE Profile APIs.io
Fixie agents API
AE Profile APIs.io
Fixie api_keys API
AE Profile APIs.io
Fixie call_throttles API
AE Profile APIs.io
Fixie calls API
AE Profile APIs.io
Fixie corpora API
AE Profile APIs.io
Fixie deleted_calls API
AE Profile APIs.io
Fixie models API
AE Profile APIs.io
Fixie schema API
AE Profile APIs.io
Fixie sip API
AE Profile APIs.io
Fixie telephony_configs API
AE Profile APIs.io
Fixie tools API
AE Profile APIs.io
#Voices
← Back to F APIs
API Details
ID
fixie:fixie-voices-api
Base URL
https://api.ultravox.ai/api
Docs
https://docs.ultravox.ai/
Provider
Fixie
APIs.io →  GitHub →
Explore more
All APIs Providers APIs.io Network
Work with this as data

Every API here is available over the API and to AI agents over MCP. APIs is not yet its own endpoint on the v1 API. Reach this content through network search and the tag graph, or the MCP server below.

Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.

MCP tools for apis
4 tools reach this content
  • search_api_evangelistSearch every content type across the network at once.
  • find_relatedThe shared-tag relevance graph — what else covers this.
  • get_tagEverything one tag labels, across all content types.
  • guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.
All tools & prompts
Call it yourself
curl for this page
Search the network for this 
curl "https://api.apievangelist.com/v1/search?q=fixie-voices-api&limit=10"
Everything under a tag 
curl "https://api.apievangelist.com/v1/tags/fixie-voices-api"

Discovery needs no key. Full bodies and the synthesis endpoints are Pro.

Get an API key

Free tier, no email required. Sign in with whichever identity you already have.

GitHub Google LinkedIn

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

Where this information came from

This is an independent, third-party profile of Fixie voices API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.