Fixie website screenshot

Fixie

Fixie is the company behind Ultravox Realtime, a speech-native voice AI platform for building natural, low-latency conversational voice agents. Rather than transcribing speech to text first, Ultravox processes audio directly to preserve tone, cadence, and pitch while cutting latency. The Ultravox Realtime REST API (api.ultravox.ai) lets developers create reusable agents, start and manage calls, define custom and built-in tools, clone and manage voices, build RAG corpora, wire telephony (Twilio, Telnyx, Plivo, SIP), and subscribe to call-lifecycle webhooks. Client SDKs ship for JavaScript, Python, Flutter/Dart, React Native, Kotlin/Android, and Swift/iOS. Fixie was backed by Redpoint Ventures; fixie.ai now redirects to ultravox.ai and its open models are published under the fixie-ai organization on Hugging Face.

Fixie publishes 14 APIs on the APIs.io network, including accounts API, agents API, api_keys API, and 11 more. Tagged areas include Company, Voice AI, Conversational AI, Real-Time, and Speech.

The Fixie catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Fixie’s developer surface includes changelog, documentation, API reference, getting-started guide, engineering blog, pricing, signup flow, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
50.1/100 developing ▬ flat Agent 28/100 agent aware saas Full breakdown ↓
scored 2026-08-30 · rubric v0.17.2
AccessSelf serve
1 APIs 1 MCP Servers
CompanyVoice AIConversational AIReal-TimeSpeechAgentsTelephonyMachine-LearningSIPWebhook

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management
BC-4270
api_keys
POST /api/api_keys

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-30 · rubric v0.17.2
Composite quality — 50.1/100 · developing
Contract Quality 13.8 / 25
Developer Ergonomics 13.2 / 20
Access Clarity 10.5 / 20
Operational Transparency 4.4 / 13
Contract Governance 0.5 / 12
Discoverability 7.6 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Surface 0 / 5
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fixie: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 14

Individual APIs this provider publishes, each with its own machine-readable definition.

Fixie accounts API

The accounts API from Fixie — 9 operation(s) for accounts.

Fixie agents API

The agents API from Fixie — 9 operation(s) for agents.

Fixie api_keys API

The api_keys API from Fixie — 2 operation(s) for api_keys.

Fixie call_throttles API

The call_throttles API from Fixie — 2 operation(s) for call_throttles.

Fixie calls API

The calls API from Fixie — 13 operation(s) for calls.

Fixie corpora API

The corpora API from Fixie — 8 operation(s) for corpora.

Fixie deleted_calls API

The deleted_calls API from Fixie — 2 operation(s) for deleted_calls.

Fixie models API

The models API from Fixie — 1 operation(s) for models.

Fixie schema API

The schema API from Fixie — 1 operation(s) for schema.

Fixie sip API

The sip API from Fixie — 3 operation(s) for sip.

Fixie telephony_configs API

The telephony_configs API from Fixie — 3 operation(s) for telephony_configs.

Fixie tools API

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

Fixie voices API

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

Fixie webhooks API

The webhooks API from Fixie — 2 operation(s) for webhooks.

Scroll for all 14

Open Collections 15

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Ultravox accounts API

OPEN COLLECTION

Ultravox accounts agents API

OPEN COLLECTION

Ultravox accounts api_keys API

OPEN COLLECTION

Ultravox accounts call_throttles API

OPEN COLLECTION

Ultravox accounts calls API

OPEN COLLECTION

Ultravox accounts corpora API

OPEN COLLECTION

Ultravox accounts deleted_calls API

OPEN COLLECTION

Ultravox accounts models API

OPEN COLLECTION

Ultravox accounts schema API

OPEN COLLECTION

Ultravox accounts sip API

OPEN COLLECTION

Ultravox accounts telephony_configs API

OPEN COLLECTION

Ultravox accounts tools API

OPEN COLLECTION

Ultravox accounts voices API

OPEN COLLECTION

Ultravox accounts webhooks API

OPEN COLLECTION

Scroll for all 15

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Fixie MCP Server

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Fixie Webhooks

ASYNCAPI

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fixie Authentication

apiKey · 1 scheme

SECURITY

Fixie Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Fixie Trust Center

trust center published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Fixie Agentic Access

114 operations · 57 acting

114 operations · 57 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Webhooks
Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

Packages
Packages
 SDKs
SDKs
 GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 TrustCenter
TrustCenter

Operate 4

Status, limits, changes, and where to get help

ChangeLog
ChangeLog
 StatusPage
StatusPage
 Deprecation
Deprecation
 Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Blog
Blog
 Website
Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: fixie
name: Fixie
description: Fixie is the company behind Ultravox Realtime, a speech-native voice AI platform for building natural, low-latency
  conversational voice agents. Rather than transcribing speech to text first, Ultravox processes audio directly to preserve
  tone, cadence, and pitch while cutting latency. The Ultravox Realtime REST API (api.ultravox.ai) lets developers create
  reusable agents, start and manage calls, define custom and built-in tools, clone and manage voices, build RAG corpora, wire
  telephony (Twilio, Telnyx, Plivo, SIP), and subscribe to call-lifecycle webhooks. Client SDKs ship for JavaScript, Python,
  Flutter/Dart, React Native, Kotlin/Android, and Swift/iOS. Fixie was backed by Redpoint Ventures; fixie.ai now redirects
  to ultravox.ai and its open models are published under the fixie-ai organization on Hugging Face.
url: https://raw.githubusercontent.com/api-evangelist/fixie/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- redpoint-ventures
x-tier: profiled
x-tier-reason: enriched-from-public-api
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
image: https://raw.githubusercontent.com/api-evangelist/fixie/refs/heads/main/openapi/fixie-ultravox-openapi-original.yml
tags:
- Company
- Voice AI
- Conversational AI
- Real-Time
- Speech
- Agents
- Telephony
- Machine-Learning
- SIP
- Webhook
tags_raw:
- Company
- Voice AI
- Conversational AI
- Real-time
- Speech
- Agents
- Telephony
- Machine Learning
- SIP
- Webhooks
apis:
- aid: fixie:fixie-accounts-api
  name: Fixie accounts API
  description: The accounts API from Fixie — 9 operation(s) for accounts.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Account
  tags_raw:
  - accounts
  properties:
  - type: OpenAPI
    url: openapi/fixie-accounts-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-agents-api
  name: Fixie agents API
  description: The agents API from Fixie — 9 operation(s) for agents.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Agents
  tags_raw:
  - agents
  properties:
  - type: OpenAPI
    url: openapi/fixie-agents-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-api-keys-api
  name: Fixie api_keys API
  description: The api_keys API from Fixie — 2 operation(s) for api_keys.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags: []
  tags_raw:
  - api_keys
  properties:
  - type: OpenAPI
    url: openapi/fixie-api-keys-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-call-throttles-api
  name: Fixie call_throttles API
  description: The call_throttles API from Fixie — 2 operation(s) for call_throttles.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags: []
  tags_raw:
  - call_throttles
  properties:
  - type: OpenAPI
    url: openapi/fixie-call-throttles-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-calls-api
  name: Fixie calls API
  description: The calls API from Fixie — 13 operation(s) for calls.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Calls
  tags_raw:
  - calls
  properties:
  - type: OpenAPI
    url: openapi/fixie-calls-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-corpora-api
  name: Fixie corpora API
  description: The corpora API from Fixie — 8 operation(s) for corpora.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - corpora
  tags_raw:
  - corpora
  properties:
  - type: OpenAPI
    url: openapi/fixie-corpora-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-deleted-calls-api
  name: Fixie deleted_calls API
  description: The deleted_calls API from Fixie — 2 operation(s) for deleted_calls.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags: []
  tags_raw:
  - deleted_calls
  properties:
  - type: OpenAPI
    url: openapi/fixie-deleted-calls-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-models-api
  name: Fixie models API
  description: The models API from Fixie — 1 operation(s) for models.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Models
  tags_raw:
  - models
  properties:
  - type: OpenAPI
    url: openapi/fixie-models-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-schema-api
  name: Fixie schema API
  description: The schema API from Fixie — 1 operation(s) for schema.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Schema
  tags_raw:
  - schema
  properties:
  - type: OpenAPI
    url: openapi/fixie-schema-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-sip-api
  name: Fixie sip API
  description: The sip API from Fixie — 3 operation(s) for sip.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - SIP
  tags_raw:
  - sip
  properties:
  - type: OpenAPI
    url: openapi/fixie-sip-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-telephony-configs-api
  name: Fixie telephony_configs API
  description: The telephony_configs API from Fixie — 3 operation(s) for telephony_configs.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags: []
  tags_raw:
  - telephony_configs
  properties:
  - type: OpenAPI
    url: openapi/fixie-telephony-configs-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-tools-api
  name: Fixie tools API
  description: The tools API from Fixie — 4 operation(s) for tools.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Tools
  tags_raw:
  - tools
  properties:
  - type: OpenAPI
    url: openapi/fixie-tools-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-voices-api
  name: Fixie voices API
  description: The voices API from Fixie — 4 operation(s) for voices.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - voices
  tags_raw:
  - voices
  properties:
  - type: OpenAPI
    url: openapi/fixie-voices-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
- aid: fixie:fixie-webhooks-api
  name: Fixie webhooks API
  description: The webhooks API from Fixie — 2 operation(s) for webhooks.
  humanURL: https://docs.ultravox.ai/
  baseURL: https://api.ultravox.ai/api
  tags:
  - Webhook
  tags_raw:
  - webhooks
  properties:
  - type: OpenAPI
    url: openapi/fixie-webhooks-api-openapi.yml
  - type: Authentication
    url: authentication/fixie-authentication.yml
  - type: AgenticAccess
    url: agentic-access/fixie-agentic-access.yml
  - type: Conventions
    url: conventions/fixie-conventions.yml
  - type: ErrorCatalog
    url: errors/fixie-problem-types.yml
  - type: Lifecycle
    url: lifecycle/fixie-lifecycle.yml
  - type: DataModel
    url: data-model/fixie-data-model.yml
  - type: Conformance
    url: conformance/fixie-conformance.yml
  - type: AsyncAPI
    url: asyncapi/fixie-webhooks.yml
  - type: Webhooks
    url: asyncapi/fixie-webhooks.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/fixie-capability-edges.yml
  name: Fixie Business Capability Map
- type: MCPServer
  url: mcp/fixie-mcp.yml
- type: Overlay
  url: overlays/fixie-ultravox-overlay.yaml
- type: DomainSecurity
  url: security/fixie-domain-security.yml
- type: TrustCenter
  url: security/fixie-trust-center.yml
- type: Packages
  url: packages/fixie-packages.yml
- type: SDKs
  url: packages/fixie-packages.yml
- type: ChangeLog
  url: changelog/fixie-changelog.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/fixie-llms.txt
- type: StatusPage
  url: https://status.ultravox.ai
- type: Deprecation
  url: https://docs.ultravox.ai/changelog/deprecation
- type: Webhooks
  url: asyncapi/fixie-webhooks.yml
- type: DeveloperPortal
  url: https://docs.ultravox.ai/
- type: Documentation
  url: https://docs.ultravox.ai/
- type: APIReference
  url: https://docs.ultravox.ai/api-reference
- type: GettingStarted
  url: https://docs.ultravox.ai/gettingstarted/quickstart/agent-console
- type: GitHubOrganization
  url: https://github.com/fixie-ai
- type: Blog
  url: https://ultravox.ai/blog
- type: Pricing
  url: https://ultravox.ai/pricing
- type: SignUp
  url: https://app.ultravox.ai
- type: Login
  url: https://app.ultravox.ai
- type: TermsOfService
  url: https://ultravox.ai/terms
- type: PrivacyPolicy
  url: https://ultravox.ai/privacy
- type: Support
  url: mailto:hello@ultravox.ai
- type: Website
  url: https://ultravox.ai/
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/fixie"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/fixie/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/fixie/evidence"

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