established · -1.6 market domain

Voice

Score 28.6 / 100 209 providers +62 via APIs 161 APIs Search apis.io →
Variants seen in the corpus: VoicesVoice

Providers using this tag (209)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 14 Complete, well-documented, and agent-ready
TwilioAuthenticationCommunicationsContact CenterEmail55 APIs91.6TelnyxCommunicationsCPaaSSMS2 APIs86.2InfobipTelecommunicationsCroatiaCPaaSMessaging50 APIs84.9ElevenLabsArtificial IntelligenceText-to-SpeechSpeech-to-Text12 APIs80.4AmigoCompanyArtificial IntelligenceHealthcareAI Agents2 APIs78.8TelesignAuthenticationCommunicationsFraud PreventionPhone Intelligence28 APIs72.0SinchCommunicationsMessagingSMS21 APIs71.7VonageCommunicationsMessagingTelecommunicationsVideo Conferencing22 APIs71.3Zoom PhoneTelecommunicationsUnited StatesUCaaSCloud PBX2 APIs67.9SignalWireCompanyCommunicationsCPaaS2 APIs66.9Amazon PinpointCampaignsCommunicationsEmailMarketing2 APIs77.8Amazon LexArtificial IntelligenceConversational AIChatbotsNatural Language Processing4 APIs76.28x8TelecommunicationsUnited StatesCPaaSUCaaS34 APIs71.3rtcStatsWebRTCObservabilityMonitoringDebugging1 API69.2
Strong 22 Solid coverage with minor gaps
SyllableCompanyArtificial IntelligenceAI Agents1 API65.1CM.comCompanyCPaaSMessagingSMS52 APIs64.1BandwidthCommunicationsCPaaSMessaging3 APIs61.0ZavuCompanyMessagingSMSWhatsApp1 API60.0RingCentralCommunicationsUCaaSVideo1 API59.9SLNGCompanySpeechSpeech-to-Text7 APIs59.6UnifonicCompanyEnterpriseCPaaSMessaging3 APIs59.0SynthflowVoice AgentsNo-CodeTelephony1 API58.1HatchCompanyVertical SoftwareCustomer CommunicationConversational AI1 API57.4SaperlyTelephonySMSPhone Numbers2 APIs57.0SpekoVoice AISpeech-to-TextText-to-Speech1 API56.5Orange Business5GArtificial IntelligenceB2BCAMARA12 APIs65.3Amazon PollyArtificial IntelligenceMachine LearningSpeech SynthesisText-to-Speech2 APIs65.2KPNTelecommunicationsNetherlandsMobile Network OperatorBroadband34 APIs62.4The Mobile First CompanyCompanyCommunicationsTelephony1 API62.0Spruce HealthHealthcareHIPAACommunicationsSecure Messaging16 APIs60.2Amazon ConnectChatContact CenterCustomer Service22 APIs59.2SwisscomTelecommunicationsSwitzerlandMobile Network OperatorBroadband2 APIs59.0KixieCompanySales EngagementTelephony3 APIs57.6TeliaxCompanyTelecommunicationsSIP Trunking4 APIs56.1Tata CommunicationsTelecommunicationsIndiaWholesale CarrierCPaaS3 APIs56.0Kore.aiCompanyArtificial IntelligenceConversational AIAgents3 APIs54.4
Developing 37 Usable, with meaningful gaps to close
GladlyCustomer ServiceCustomer ExperienceContact CenterAI Customer Service1 API54.0SarvamCompanyArtificial IntelligenceMachine LearningSpeech-to-Text1 API53.2Bright PatternCompanyContact CenterCCaaSCustomer Experience11 APIs52.2CallfireCompanyCommunicationsCloudMessaging13 APIs51.0OutRivalCompanyEnterprise SaasConversational AIAI Agents2 APIs49.7BirdCommunicationsSMSEmailWhatsApp23 APIs48.6DeepdubCompanyText-to-SpeechDubbing2 APIs47.9Sonde HealthCompanyHealthHealthcareDigital Health1 API46.8Algebras AICompanyTranslationLocalizationInternationalization1 API46.7SendbirdCustomer ServiceVideoOmnichannel1 API45.6Arpeggi LabsCompanyMusicAudioArtificial Intelligence1 API44.3KaleyraCPaaSMessagingSMSWhatsApp1 API43.3AvochatoMessagingSMSRCS7 APIs43.0ShapesCompanyArtificial IntelligenceAI AgentsChat1 API42.5Cisco Voice PortalContact CenterIVRTelephony4 APIs42.2KotobaCompanyArtificial IntelligenceMachine Learning4 APIs41.4seven.ioCompanySMSMessaging11 APIs40.9Keyframe LabsCompanyArtificial IntelligenceAvatarsVideo1 API40.7WhippyCommunicationsMessagingSMSEmail1 API39.9GliaCompanyCustomer ServiceContact CenterBanking3 APIs39.7Neutrino APIData ValidationData ToolsTelephonyCommunications2 APIs54.1AAA AIArtificial IntelligenceAgentsMulti-AgentLLM Orchestration1 API53.1QuoCompanyCommunicationsMessagingSMS1 API53.0Route MobileTelecommunicationsIndiaCPaaSMessaging5 APIs51.6Reliance JioTelecommunicationsIndiaMobile Network OperatorNetwork APIs3 APIs50.5NetomiCompanyArtificial IntelligenceAI AgentsCustomer Experience1 API50.2Moore ThreadsCompanyGPUArtificial IntelligenceMachine Learning4 APIs48.1PuppetryCompanyArtificial IntelligenceVideoText-to-Speech1 API48.1AmazonAmazonAdvertisingAlexaE-Commerce2 APIs47.3Bharti AirtelTelecommunicationsIndiaMobile Network OperatorNetwork APIs5 APIs46.7NextivaCompanyCommunicationsContact Center5 APIs46.3UnisoundCompanyArtificial IntelligenceSpeech RecognitionText-to-Speech3 APIs45.8DelphiCompanyArtificial IntelligenceAI ClonesDigital Minds1 API44.7RokidSmart GlassesAugmented RealityWearablesArtificial Intelligence2 APIs42.6Epic GamesAchievementsAnti-CheatCross-PlatformEOS1 API40.9Heidi HealthHealthcareHealth TechAI Medical ScribeAmbient AI1 API40.3SpeechmaticsSpeech RecognitionSpeech-to-TextTranscriptionReal-Time Transcription2 APIs40.2
Thin 52 Limited public surface area
Google VoiceGoogle VoiceMessagingPhoneTelecommunications1 API38.9PlivoCommunicationsCPaaSSMS1 API38.9Retell AIArtificial IntelligenceAgentsReal-Time1 API38.5Smallest AIArtificial IntelligenceText-to-SpeechReal-Time1 API38.1VoiceittSpeech RecognitionSpeech-to-TextAccessibility1 API38.1CartesiaArtificial IntelligenceVoice AIText-to-SpeechSpeech-to-Text1 API37.9QuarterzipCompanyAI AgentsCustomer ServiceOnboarding37.8RainbowCommunicationsCPaaSChat3 APIs35.2MiniMaxArtificial IntelligenceLLMInferenceMulti-Modal1 API35.0VapiArtificial IntelligenceAgentsReal-Time1 API34.4AlianzaCompanyCommunicationsCloud Communications2 APIs34.2JustCallSMSCloud PhoneContact Center1 API34.0VoiceflowArtificial IntelligenceConversational AIChat1 API34.0CometChatChatMessagingVideo1 API33.9WellSaid LabsArtificial IntelligenceText-to-SpeechAudio1 API33.9Kalpa LabsCompanySpeechText-to-Speech1 API33.3NarakeetText-to-SpeechAudioVideo1 API33.3Bland AIArtificial IntelligenceAgentsPhone1 API32.2LiveKitReal-TimeWebRTCAudioVideo6 APIs31.5MoviusCompanyCommunicationsMessagingMobile1 API31.3Resemble AIArtificial IntelligenceText-to-SpeechVoice Cloning1 API31.1Hume AIArtificial IntelligenceEmpathicEmotion4 APIs30.8SynthesiaArtificial IntelligenceGenerative AIVideoAvatars1 API30.7AgoraReal-Time EngagementVideoSignaling11 APIs30.3Inworld AIArtificial IntelligenceCharactersGames1 API29.7ExotelCloud TelephonySMSIndia1 API28.8MurfArtificial IntelligenceText-to-SpeechVoiceover1 API28.3SMSAPIMessagingSMSMMS1 API28.0LayercodeArtificial IntelligenceVoice AgentsReal-Time1 API27.7PipecatArtificial IntelligenceMulti-ModalAgents1 API27.3UJETCompanyEnterpriseContact CenterCCaaS27.2ClickSendCommunicationsSMSMMS1 API26.9DyteVideoReal-TimeWebRTC1 API26.7UberduckArtificial IntelligenceText-to-SpeechVoice Cloning1 API26.711xCompanyArtificial IntelligenceAI AgentsSales1 API38.9engageSPARKCompanyMessagingSMS1 API38.4BurnerCompanyPhone NumbersSMSMMS1 API37.5ConcentrixAI AgentsBusiness Process OutsourcingConsultingConversational AI2 APIs37.5SobotCompanyEnterpriseContact CenterCustomer Service4 APIs35.5NablaHealthcareAmbient AIClinical DocumentationMedical Transcription1 API34.7Unreal SpeechText-to-SpeechSpeech SynthesisAudio1 API34.6JitsiVideo ConferencingWebRTCReal-Time CommunicationOpen Source10 APIs33.3LemonflowCompanyArtificial IntelligenceAI AgentsCustomer Service1 API33.0SonosCompanyConsumerAudioMusic1 API31.3AircallCommunicationsCloud PhoneCRM1 API30.3RingCaptcha (ThriveCom)CompanyTwo-Factor AuthenticationPhone VerificationOne-Time Passcode1 API29.6TenfoldCompanyCTIContact CenterTelephony1 API29.3DialpadCommunicationsArtificial IntelligenceContact Center1 API29.1TalkdeskContact CenterCCaaSWebhook1 API28.6PoshArtificial IntelligenceConversational AIAI AgentsBanking1 API27.7OddcastCompanyText-to-SpeechSpeech SynthesisAvatars2 APIs27.4RimeArtificial IntelligenceText-to-SpeechReal-Time1 API26.4
Emerging 45 Early or largely undocumented
Custom Chat API | MirrorFlyChat APIMessagingCPaaSVoIP1 API25.9SpeechifyArtificial IntelligenceText-to-SpeechSpeech Synthesis1 API25.5RinglyCompanyArtificial IntelligenceCustomer Service25.446elksCPaaSSMSMMS1 API24.9High FidelityCompanyConsumerSpatial AudioAudio1 API23.8SynervozCompanyAudioSDK23.1Microsoft SkypeCommunicationsMessagingMicrosoftVideo2 APIs22.8VoquillCompanyDictationSpeech-to-Text22.6Africa's TalkingCommunicationsSMSUSSD1 API21.9Tin CanCompanyConsumerHardwareTelecommunications21.6VoxerCompanyCommunicationsPush To TalkWalkie-Talkie21.3AnyvoiceArtificial IntelligenceText-to-SpeechSpeech Synthesis19.8SierraAgentsArtificial IntelligenceChatConversational AI1 API17.8Uare.aiCompanyArtificial IntelligencePersonal AIDigital Twin16.9Pindrop SecurityCompanySecurityAuthentication16.6OrbitelCompanyCPaaSMessagingSMS16.3AfilnetCompanyCommunicationsSMS15.8YampaCompanyArtificial IntelligenceAI AgentsCustomer Service15.4AgentifAICompanyArtificial IntelligenceConversational AI14.7ReadSpeakerText-to-SpeechSpeechAudio1 API14.7Actium HealthCompanyHealthcarePatient EngagementConversational AI13.9NurixCompanyArtificial IntelligenceConversational AIAI Agents13.8DecagonAgentsArtificial IntelligenceChatConversational AI1 API13.6Replica StudiosCompanyText-to-SpeechSpeech to Speech1 API13.4ChimelabsCompanyArtificial IntelligenceReceptionist13.2IntermediaCloudCommunicationsContact CenterVideo Conferencing5 APIs13.1LatoCompanyArtificial IntelligenceAgentsMarket Research12.8StoryboardCompanyFleet OperationsArtificial Intelligence11.4Robylon AICustomer ServiceAI AgentsConversational AI1 API11.2ParloaAgentsArtificial IntelligenceCall CenterCCaaS2 APIs11.0NuanceCompanySpeech RecognitionConversational AINatural Language Understanding5 APIs25.1AgentSeaCompanyArtificial IntelligenceAI AgentsAgent Orchestration2 APIs25.0Wit.AICompanyNatural Language ProcessingSpeech RecognitionSpeech-to-Text1 API23.8Rev AISpeech RecognitionSpeech-to-TextTranscriptionAudio7 APIs21.0BesideCompanySoftwareCommunications19.8Maxim AIArtificial IntelligenceLLMAgentsObservability1 API18.9Scaled CognitionArtificial IntelligenceAgentsLLMCustomer Experience1 API18.7SingtelTelecommunicationsSingaporeMobile Network OperatorNetwork APIs7 APIs18.6callagent.proAI AgentsTelephonyPhone Agents1 API17.0Useful SensorsCompanyArtificial IntelligenceSpeech-to-TextText-to-Speech16.1OpenEvidenceHealthcareClinical Decision SupportMedical AIGenerative AI14.6SalientCompanyArtificial IntelligenceLendingLoan Servicing12.8Altira HealthCompanyHealthcareHealth TechClinical11.8OutverseCompanyArtificial IntelligenceAI AgentsCustomer Service11.8FlossyCompanyArtificial IntelligenceAI AgentsHealthcare11.5
Minimal 38 Almost no public developer surface
iBasisCompanyTelecom InfrastructureMessaging10.5VolleyCompanyGamesEntertainment10.1David AICompanyArtificial IntelligenceMachine LearningAudio Data9.7DialupCompanySocialCommunications9.3getriffCompanyVideo ConferencingTeam CollaborationRemote Work9.3ZymblyCompanyArtificial IntelligenceAviationAircraft Maintenance9.0CommunicationsCPaaSSMSMMS8.7Open Voice NetworkArtificial IntelligenceLinux FoundationStandards1 API8.6SandbarCompanyConsumer HardwareWearables6.4HyroCompanyArtificial IntelligenceConversational AIAI Agents6.2VoxeetCompanyConferencingVideo5.9op.aiArtificial IntelligenceConversational AIPlatform1 API4.6RcomCompanyTelecommunicationsEnterpriseNetworking3.9SnipsCompanyArtificial IntelligenceNatural Language Understanding3.7ClubhousevoiceCompanyAudioCommunications3.4Talk LabsCompanyArtificial IntelligenceCorporate Training3.4SonanticText-to-SpeechEmotive AIAcquired3.1Allegiance TelecomCompanyTelecommunicationsCLEC0.0Brooktrout TechnologyCompanyFaxTelephony0.0DrivetimeCompanyGamingEntertainment0.0inbilinCompanySocialMobile0.0PlayHTText-to-SpeechVoice CloningVoice Agents1 API0.0SpeechlyCompanySpeech RecognitionSpoken Language Understanding1 API0.0TalkoCompanyCommunicationsMessaging0.0ToyTalkCompanyConversational AIChatbots0.0BT GroupTelecommunicationsMobile NetworkBroadbandFibre15 APIs10.1ClubhouseCompanySocial AudioSocial NetworkLive Audio9.8PingerCompanyCommunicationsTelecommunicationsMessaging9.4LightberryCompanyRoboticsArtificial IntelligenceConversational AI8.9InsurifyInsuranceMarketplaceComparisonAI Agents1 API6.2Atmee.aiCompanyArtificial IntelligenceAvatarsConversational AI4.4Daero GroupCompanyConstructionConstruction TechnologyField Operations4.4HUM IndustriesCompanyWearablesArtificial IntelligenceConsumer Hardware3.4ClementineCompanyAcquiredDefunctEnterprise Communication0.0Conexant SystemsCompanySemiconductorsHardwareAudio0.0Focal CommunicationsCompanyTelecommunicationsCLECLocal Exchange Carrier0.0OrativeCompanyEnterprise SoftwareConferencingCollaboration0.0TalkrayCompanyMessagingCommunications0.0
Unrated 1 Not yet scored
VoiceraCompanyArtificial IntelligenceTranscription

APIs with this tag (160)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 23 Complete, well-documented, and agent-ready
Twilio Voice APIThe Voice API from Twilio — 10 operation(s) for voice.91.6Salesforce Service Cloud Voice APIThe Salesforce Service Cloud Voice API provides Telephony Integration REST API and Voice Toolkit API for pr...88.8OpenAI Agents SDKThe OpenAI Agents SDK is a lightweight framework for building multi-agent workflows in Python and TypeScrip...84.5OpenAI Realtime APIThe Realtime API from OpenAI — 9 operation(s) for realtime.84.5elevenlabs Voices APIEndpoints for managing voices including listing, creating, editing, and deleting voices in the library.80.4Microsoft Azure Communication Services APIAzure Communication Services provides multichannel communication APIs that enable developers to add voice, ...76.5Telesign Voice APIThe Voice API from Telesign — 1 operation(s) for voice.72.0Sinch Voice APIThis document provides a detailed user guide and reference documentation on the Sinch Voice REST API. For i...71.78x8 CPaaS Voice WebhooksSubaccount-level HTTP POST callbacks emitted by the 8x8 CPaaS voice platform: VSS (Voice Session Summary) f...71.3Zendesk Talk APIThe Zendesk Talk API is the reference API for managing Zendesk voice capabilities. It provides endpoints fo...71.2Zendesk Talk Availabilities APIThe Zendesk Talk Availabilities API lets you manage and query agent availability for voice calls. It provid...71.2Zendesk Talk Digital Lines APIThe Zendesk Talk Digital Lines API lets you manage the digital lines in your Zendesk voice account. Digital...71.2Zendesk Talk Greetings APIThe Zendesk Talk Greetings API lets you manage the greetings used in your Zendesk voice account. Zendesk pr...71.2Zendesk Talk IVRs APIThe Zendesk Talk IVRs API lets you manage Interactive Voice Response systems that use keypad tones to route...71.2Zendesk Talk Lines APIThe Zendesk Talk Lines API lets you list the available lines, including both phone numbers and digital line...71.2Zendesk Talk Partner Edition APIThe Zendesk Talk Partner Edition API includes a Standard Call Object with endpoints to save, read, and upda...71.2Zendesk Talk Phone Numbers APIThe Zendesk Talk Phone Numbers API lets you manage the phone numbers in your Zendesk voice account. You can...71.2Zendesk Talk Recordings APIThe Zendesk Talk Recordings API lets you manage call recordings stored by Talk. Recordings are exposed in t...71.2Zendesk Talk Stats APIThe Zendesk Talk Stats API provides access to call statistics and current queue activity for your voice acc...71.2Zendesk Talk Voice Settings APIThe Zendesk Talk Voice Settings API lets you view and manage the account settings of your Zendesk voice acc...71.2Service Cloud Voice for Partner Telephony APIDeveloper API for connecting third-party telephony systems to Service Cloud Voice, including the Connector ...70.4Service Cloud Voice Telephony Integration APIREST API for integrating telephony systems with Service Cloud Voice, enabling programmatic management of vo...70.4SignalWire Calling API (JSON-RPC)An OpenRPC 1.3.2 contract for real-time control of live calls over RELAY — 8 methods (calling.dial, calling...66.9
Strong 28 Solid coverage with minor gaps
IBM Voices APIManage available voices.66.4ServiceNow Voice Interaction Resource APIThe ServiceNow Voice Interaction Resource API provides REST endpoints for integrating telephony and voice s...66.0Orange Business Talk APIProgrammable management for Business Talk, Orange Business's enterprise SIP trunking and IP voice service. ...65.3Orange Business Voice as a Service APIProgrammable voice / VoIP API for integrating outbound calls, IVR, and click-to-call into business applicat...65.3Amazon Polly Voices APIThe Voices API from Amazon Polly — 1 operation(s) for voices.65.2CM.com Voices APIThe Voices API from CM.com — 2 operation(s) for voices.64.1AIMLAPI Voice APIThe Voice API from AIMLAPI — 2 operation(s) for voice.63.3KPN Voice APICall related resource management62.4EDF Energy Voice APIThe Voice API from EDF Energy — 2 operation(s) for voice.62.2DialNexa Voices APIThe Voices API from DialNexa — 5 operation(s) for voices.60.8Origin Energy Voice APIThe Voice API from Origin Energy — 2 operation(s) for voice.59.6Amazon Voice ID APIAmazon Connect Voice ID provides real-time caller authentication and fraud risk detection to make voice int...59.2AutoContent API Voices APIThe voices API from AutoContent API — 2 operation(s) for voices.59.0Jasper Voices APIThe Voices API from Jasper — 2 operation(s) for voices.59.0Swisscom Voice Mail APILegacy Voice API for listing and retrieving recent voicemail messages for a Swisscom MSISDN, secured by OAu...59.0Swisscom Voice VoIP APILegacy Voice API cluster for controlling a Swisscom VoIP subscriber — placing and listing calls, managing c...59.0Amazon Web Services Voices APIThe Voices API from Amazon Web Services — 1 operation(s) for voices.58.5Synthflow Voices APIThe Voices API from Synthflow — 1 operation(s) for voices.58.1Phonic Voices APIThe voices API from Phonic — 2 operation(s) for voices.57.7Fixie Voices APIThe voices API from Fixie — 4 operation(s) for voices.57.6Kixie Event APIThe primary Kixie automation surface. A single POST endpoint on the apig.kixie.com gateway that dispatches ...57.6Saperly Voice APIPlace and control outbound calls and fetch call records. Audio always stays in-network — there is no live m...57.0Saperly Voices APIDiscover the in-network text-to-speech voices a hosted connection can speak with. Each voice carries its la...57.0Speko Voice APIThe Voice API from Speko — 8 operation(s) for voice.56.5Venice.ai Voices APIThe Voices API from Venice.ai — 1 operation(s) for voices.56.3Zoom Phone APIThe Zoom Phone API allows developers to access Zoom Phone functionality to build private services or public...56.2KugelAudio Voices APIThe Voices API from KugelAudio — 6 operation(s) for voices.54.8StepFun Realtime APIBidirectional realtime voice over WebSocket (wss://api.stepfun.com/v1/realtime) with OpenAI Realtime-style ...54.4
Developing 39 Usable, with meaningful gaps to close
Anam.ai Voices APIThe Voices API from Anam.ai — 3 operation(s) for voices.54.2ServiceTitan Telecom APIRetrieve inbound and outbound call records, call recordings, call analytics, and call reasons. Powers Conta...54.0Gemini Live APILow-latency real-time voice and video interactions with Gemini using WebSockets for streaming multimodal in...53.5Vertex AI Gemini Live APIEnterprise real-time multimodal streaming API on Vertex AI for building low-latency voice and video AI agents.53.5DeepL Voice APIThe DeepL Voice API provides real-time speech transcription and translation. A POST to /v3/voice/realtime i...51.8Route Mobile Enterprise Voice 2.0 APIRoute Mobile's enterprise voice and cloud telephony surface, documented as narrative guides on the develope...51.6Letta Voice APIVoice (low-latency) chat completions endpoint for agents.51.5HeyMilo Voices APIBrowse the workspace voice registry for AI interviewer voices.51.1Bird Phone Numbers APISearch, purchase, and manage phone numbers inventory programmatically. Supports number search by country an...48.6ELBO AI, INC Voices APIThe Voices API from ELBO AI, INC — 1 operation(s) for voices.48.1Moore Threads AIBook Speech Recognition APISpeech-to-text in two shapes. A realtime WebSocket at /api/v1/asr accepts 16 kHz mono audio and returns Sen...48.1Moore Threads AIBook Streaming Voice Conversion APIA WebSocket voice-conversion service at /api/v1/streaming_vc that re-timbres a live 16 kHz 16-bit mono PCM ...48.1Moore Threads AIBook Text-to-Speech APIHTTP and WebSocket speech synthesis. A non-streaming POST /api/v1/tts/generate returns a complete wav/mp3 f...48.1Deepdub Voice APIThe Voice API from Deepdub — 2 operation(s) for voice.47.9Amazon Alexa Skills Kit APIThe Alexa Skills Kit (ASK) REST APIs enable developers to create, manage, test, and deploy custom voice ski...47.3Gradium Voices APIManage custom voice clones47.0Telia ACE Audio Stream Forwarding APIBidirectional streaming gRPC service over HTTP/2 that forwards copies of the audio streams in Telia ACE con...46.8Discord Social SDKThe Discord Social SDK allows game developers to add rich social features into their games across desktop, ...46.7Discord Voice APIThe Discord Voice API provides the protocol for establishing and managing voice connections between clients...46.7Happyrobot Voice APIThe Voice API from Happyrobot — 1 operation(s) for voice.46.2Piknik.Spot Voice APIThe Voice API from Piknik.Spot — 2 operation(s) for voice.45.9Unisound AI Open Platform Speech WebAPIWebSocket speech APIs on the Unisound AI Open Platform: one-sentence speech recognition (Mandarin, Cantones...45.8Sendbird Calls APIThe Sendbird Calls API provides voice and video calling capabilities, enabling real-time one-on-one and gro...45.6Okareo Voice APIVoice calls, streaming, and observers.45.1Google Cloud Text-To-Speech Voices APIThe Voices API from Google Cloud Text-To-Speech — 1 operation(s) for voices.45.0Delphi Voice APIStream voice responses and synthesize speech as real-time PCM audio.44.7AT&T Cloud Voice APIsREST APIs for AT&T Business Voice and Cloud Voice services enabling partners to manage service ordering, pr...43.9Kaleyra Voice APIClick-to-call and outbound voice.43.3NUGU DevelopersDeveloper centre for NUGU, SK Telecom's Korean-language voice assistant platform, where third parties build...41.5SK Telecom Voice APIThe Voice API from SK Telecom — 1 operation(s) for voice.41.5Sarj AI Developer API Voices APIThe Voices API from Sarj AI Developer API — 3 operation(s) for voices.41.2HeyGen APIThe HeyGen REST API exposes video generation, avatar management, text-to-speech (Starfish), video translati...41.1HeyGen Voices APIVoice listing and voice-management endpoints.41.1D-ID Voices APIList available TTS voices40.9Epic Online Services (EOS)Epic Online Services is Epic's free cross-platform backend for games. EOS exposes both a native C/C++ SDK (...40.9Epic Online Services Voice APIThe EOS Voice Interface delivers in-game voice chat using Vivox backend infrastructure, with positional aud...40.9seven.io Voice APIThe Voice API from seven.io — 1 operation(s) for voice.40.9Keyframe Labs Voices APIThe Voices API from Keyframe Labs — 2 operation(s) for voices.40.7Tavus Voices APIThe Voices API from Tavus — 1 operation(s) for voices.39.5
Thin 42 Limited public surface area
China Mobile Communication Capability Open PlatformThe 通信能力开放平台 (Communication Capability Open Platform) is China Mobile's commercial network-capability chann...39.0Plivo Application APIThe Plivo Application API manages voice applications — bundles of XML/answer/hangup/fallback URLs (and mess...38.9Plivo Audio Stream APIThe Plivo Audio Stream API attaches a real-time WebSocket audio stream to a live call, enabling AI voice ag...38.9Plivo Conference APIThe Plivo Conference API manages live conference rooms — listing, retrieving members, kicking, muting, deaf...38.9Plivo Multiparty Call APIThe Plivo Multiparty Call API supports building multi-participant calls programmatically — adding/removing ...38.9Plivo Recording APIThe Plivo Recording API exposes call and conference recordings — listing, retrieving, downloading, and dele...38.9Plivo Verified Caller ID APIThe Plivo Verified Caller ID API allows trial accounts to verify outbound caller IDs for use as the From nu...38.9Plivo Voice Call APIThe Plivo Voice Call API initiates outbound calls, retrieves details for live and historical calls, and sup...38.9Plivo Zentrunk SIP Trunking APIThe Plivo Zentrunk SIP Trunking API manages termination and origination SIP trunks — outbound trunks (crede...38.9Phonely Agents APIManage Phonely voice agents programmatically. Retrieve a single agent or list all agents for a user, and up...38.7Phonely Webhooks APIReceive structured post-call event data from Phonely after each AI voice interaction completes. The Send Ca...38.7Smallest AI Voices APIList prebuilt voices and manage cloned voices.38.1Cartesia Voices APIVoice catalog management and voice cloning.37.9TalkPix API Voices APIThe Voices API from TalkPix API — 1 operation(s) for voices.37.6Burner APIOAuth 2.0 REST API for programmatic access to Burner line management, messaging (SMS/MMS) and configuration...37.5iX Hello Customer v2 Outbound Calling APIPlaces outbound PSTN and SIP voice calls programmatically and runs an authored iX Hello flow on the call. T...37.5Neuphonic Voices APIThe Voices API from Neuphonic — 2 operation(s) for voices.35.6MiniMax Voice APIThe Voice API from MiniMax — 4 operation(s) for voice.35.0Together AI Voices APIThe Voices API from Together AI — 1 operation(s) for voices.34.6Colossyan Voices APIList available AI voices.34.5Vapi Webhooks APIServer- and client-side webhook events emitted by Vapi during voice sessions, including end-of-call reports...34.4JustCall REST APIREST API for placing calls, sending SMS and MMS messages, managing contacts, phone numbers, users, and call...34.0WellSaid Labs Voices APIDiscover available voice avatars.33.9Global Relay Voice APIEndpoints for archiving voice and video recordings33.3Narakeet Voices APIList the voices available for audio and video production.33.3Bland AI Platform APIREST API for sending and managing AI phone calls, pathways (conversation flows), voices and voice clones, p...32.2Agora Voice Calling APIThe Agora Voice Calling API embeds high-quality real-time voice chat into any application. Provides crystal...30.3Aircall Calls APIThe Calls API from Aircall — 7 operation(s) for calls.30.3Inworld AI Voices APIVoice catalog and custom voice management29.7Inworld Realtime APILow-latency speech-to-speech voice API for natural conversation experiences. Included with all plans.29.7Messaging APIsA portfolio of messaging APIs including SMS Middle East and Africa, Messaging Pro Cameroon, Voice as a Serv...29.4Dialpad Calls APIThe Calls API from Dialpad — 7 operation(s) for calls.29.1Exotel Voice APIPlace and control outbound voice calls.28.8HTS Assist (Agentic AI Customer Service)Agentic AI built specifically for airline and travel customer service, delivering end-to-end autonomous res...28.5Deutsche Telekom Voice APIDeliver high-quality voice experiences over the low-latency, feature-rich, global Deutsche Telekom network ...27.8Layercode Realtime Voice APIBidirectional realtime WebSocket transport that streams base64 PCM microphone audio from the browser to Lay...27.7Vocalware Text-to-Speech APIVocalware is Oddcast's cloud text-to-speech service. It exposes a pay-as-you-go HTTP/REST API (suitable for...27.4Rephrase.ai Voice APIThe Voice API from Rephrase.ai — 1 operation(s) for voice.27.0Argil Voices APIClone, list, and sync voices.26.9ClickSend Voice APISend and view voice (text-to-speech) messages.26.9Uberduck Voices APIList, filter, and clone voices.26.7Podcastle Voices APIBrowse the voice library and create instant voice clones.26.6
Emerging 23 Early or largely undocumented
Aider Voice APIAider Voice-to-Code Input.26.0Creatify Voices APICatalog of AI voices and accents.26.0MirrorFly Chat Platform APIToken-authenticated REST API for building in-app chat, split into User APIs and Admin APIs (users, contacts...25.9Photon Voice APICross-platform low-latency voice chat built directly on top of Photon Realtime - it inherits Realtime's mat...25.5Speechify Voices APIThe Voices API from Speechify — 2 operation(s) for voices.25.5Vocode Voices APIThe Voices API from Vocode — 4 operation(s) for voices.25.3what3words AutoSuggest EndpointValidates and autocorrects partial or imperfect three-word input, returning ranked suggestions. Supports fo...24.2High Fidelity Spatial Audio APIClient SDK and hosted spatial audio server for embedding real-time positional voice in web and native apps....23.8Respeecher Voices APIThe voices API from Respeecher — 4 operation(s) for voices.23.6Azure Communication ServicesAzure Communication Services (successor to Skype developer APIs) provides cloud-based communication APIs fo...22.8Skype URIs APISkype URIs provide a mechanism for launching Skype actions from web pages and applications. Developers can ...22.8Africa's Talking Voice APIOutbound calls, transfers, queue status, and media upload.21.9Singtel CPaaS Voice APIProgrammable voice / VoIP calling embedded into business applications, sold as part of the Singtel CPaaS po...18.6Sierra Agent OSSierra Agent OS is the enterprise platform for building, deploying, and operating customer-facing AI agents...17.8callagent.pro Agent APIREST API for everything the callagent.pro dashboard does: agents, test-chat and test-call, numbers, SIP acc...17.0NTT DOCOMO BUSINESS Developer PortalUnified API gateway for NTT Communications / NTT DOCOMO BUSINESS enterprise services. Catalogs APIs across ...17.0Cox Business Services APIREST API for Cox Business customers to manage voice, internet, and cloud connectivity services, including c...15.7ReadSpeaker Speech Cloud APIA cloud-based text-to-speech API. When using the API from within your software or application, you simply s...14.7Inmarsat GSPS APIThe GSPS (Global Satellite Phone Service) API supports Inmarsat's L-band geostationary satellite voice netw...13.8Replica APIReplica API v2 (OpenAPI 3.0.0) — REST API for AI text-to-speech, speech-to-speech, and voice-library operat...13.4Intermedia Voice APIThe Intermedia Voice API enables developers to embed voice calling capabilities into CRMs, ERPs, ticketing ...13.1Rakuten CPaaS Confirm (OTP) APIOne-time PIN delivery and verification API for two-factor authentication and transaction confirmation, with...11.3Parloa Agent Management Platform (AMP)The Parloa Agent Management Platform (AMP) is the primary product surface for designing, testing, scaling, ...11.0
Minimal 5 Almost no public developer surface
BT Wholesale HubCo WHCE APIWholesale Hosted Centrex / Voice (WHCE) API for managing hosted voice services delivered via BT Wholesale's...10.1Global Voice Services APIInitiate ordering of phone numbers and configuration for BT Global Voice Services consumed by multinational...10.1Open Voice Network APIAPI for the Open Voice Network, providing programmatic access to open standards and interoperability framew...8.6PlayAI Text-to-Speech APIThe PlayAI Text-to-Speech API converts text into natural, human-like speech using the PlayDialog 1.0, Dialo...0.0PlayHT Voices APIPrebuilt voice catalog.0.0

Companies reaching this through an API (62)

These companies publish an API, specification or operation carrying “Voice” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Aider AIMLAPI Amazon Web Services Anam.ai Argil AT&T AutoContent API China Mobile Colossyan Cox Communications Creatify D-ID DeepL Deutsche Telekom DialNexa Discord EDF Energy Fixie Global Relay Google Cloud Text-To-Speech Google Gemini Gradium Happyrobot HeyGen HeyMilo Hopper IBM Inmarsat Jasper KugelAudio Letta Microsoft Azure Neuphonic NTT Okareo OpenAI Orange Origin Energy Phonely Phonic Photon Engine Piknik.Spot Podcastle Rakuten Mobile Rephrase.ai Respeecher Salesforce Salesforce Service Cloud APIs Sarj AI Developer API ServiceNow
Show all 62 companies ↓
ServiceTitan SK Telecom StepFun TalkPix API Tavus Telia Company Together AI Venice.ai Vocode what3words Zendesk Zoom

Score breakdown

Frequency
71.4
log-scaled weighted occurrences
Breadth
4.7
spread across providers
Quality lift
34.1
mean composite of providers using it
Cohesion
18.6
strength of nearest seed neighbor

Where this tag sits

209 providers carry this tag directly, and 394 counting the 6 narrower tags below — 185 more to reach.

Voice AI 114 providers Voice Agents 33 providers Speech-to-Text 46 providers Text-to-Speech 67 providers Speech Recognition 51 providers Speech Synthesis 11 providers

Related tags

SMS 67 co-occurrences Text-to-Speech 49 co-occurrences Conversational AI 63 co-occurrences Communications 58 co-occurrences Telephony 39 co-occurrences Contact Center 44 co-occurrences CPaaS 35 co-occurrences Messaging 75 co-occurrences

Where this tag comes from

Provider tag219
Api tag160
Openapi tag64
Openapi op tag182

Markets provisional

Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.

MarketShare of the market's providers
Telecom Network APIs (CAMARA)60%
Communications (CPaaS)48%
Speech and Voice AI39%
Customer Support, Helpdesk and Contact Center22%

Cohort brief

Auto-generated

The 196 providers in the APIs.io catalog tagged Voice, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
196
of 209 in the catalog
Mean Kin Score
34.5
+12.3 vs catalog 22.2
Mean Agent Readiness
20.4
+8.4 vs catalog 12
Spread
0–91.6
median 33.2 · σ 20.3
How the 196 split by band
Exemplar 14Strong 22Developing 37Thin 52Emerging 45Minimal 26
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 38.5 23.2 +15.3 196
Contract Quality 32.2 17.2 +15 196
Access Clarity 36.6 23.9 +12.7 196
Operational Transparency 24.1 13 +11.1 196
Discoverability 65.5 57.9 +7.6 196
Contract Governance 9.8 6.5 +3.3 196

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 25% 13% +12
MCP server (first-party) 26% 12% +14
Agent Skills 0% 0% 0
OAuth scopes 13% 11% +2
Security 98% 98% 0
Arazzo workflows 3% 2% +1
Governance rules 23% 16% +7

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Twilio 91.6
  2. 2 Telnyx 86.1
  3. 3 Infobip 84.9
  4. 4 ElevenLabs 80.4
  5. 5 Amigo 78.8
  6. 6 Amazon Pinpoint 77.8
  7. 7 Amazon Lex 76.2
  8. 8 Telesign 72
  9. 9 Sinch 71.7
  10. 10 8x8 71.3
Top by Agent Readiness
  1. 1 Telnyx 78.1
  2. 2 Bird 61.5
  3. 3 Infobip 61.3
  4. 4 Speko 61
  5. 5 Teliax 59.1
  6. 6 Saperly 55.8
  7. 7 Synthflow 54.9
  8. 8 The Mobile First Company 54.5
  9. 9 Zoom Phone 54.4
  10. 10 Twilio 53.7
All 209 members of this roster resolve to a provider in the catalog; 196 carry a score (94%). The figures above describe the scored members only.
Coverage caveat. 161 of 196 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

Every tag 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 tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • 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 tag 
curl "https://apis.io/api/v1/tags/voice"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/voice"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/voice/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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