emerging · 1.3 market domain

Voice Agents

Score 20.8 / 100 33 providers +4 via APIs 7 APIs Search apis.io →
Variants seen in the corpus: Voice AgentVoice Agents

Providers using this tag (33)

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

Exemplar 1 Complete, well-documented, and agent-ready
ElevenLabsArtificial IntelligenceText-to-SpeechSpeech-to-TextVoice12 APIs81.8
Strong 2 Solid coverage with minor gaps
SynthflowVoiceNo-CodeTelephony1 API60.0GridspaceCompanyVoice AIConversational AI1 API59.3
Developing 12 Usable, with meaningful gaps to close
SLNGCompanySpeechVoiceSpeech-to-Text7 APIs53.6VoiceGenieCompanyVoice AIConversational AISales Automation1 API52.4PhonicCompanyArtificial IntelligenceVoice AIConversational AI1 API51.7BolnaCompanyArtificial IntelligenceVoice AIConversational AI1 API49.9iCallAgent Public APIVoice AIvoice ai assistantConversational AI1 API49.3GradiumCompanyAi MlVoice AIText-to-Speech1 API47.7PhonelyArtificial IntelligenceVoice AIConversational AI2 APIs45.5PlayHTVoiceTTSText-to-SpeechVoice Cloning1 API42.8CartesiaArtificial IntelligenceVoice AIText-to-SpeechSpeech-to-Text1 API41.4Sarj AI Developer APIVoice AIConversational AIArabic AI4 APIs41.3Smallest AIArtificial IntelligenceText-to-SpeechVoiceReal-Time1 API41.2Retell AIArtificial IntelligenceVoiceAgentsReal-Time1 API39.9
Thin 6 Limited public surface area
supernormalCompanyMeetingsMeeting NotesTranscription1 API35.9VapiArtificial IntelligenceVoiceAgentsReal-Time1 API35.5LayercodeArtificial IntelligenceVoiceReal-Time1 API34.6VocodeVoice AITelephonyConversational AI1 API34.0Bland AIArtificial IntelligenceVoiceAgentsPhone1 API32.5Hamming AIArtificial IntelligenceLLMTesting1 API30.0
Emerging 10 Early or largely undocumented
Samora AICompanyConversational AIVoice AI1 API26.1SkipprCompanyAi MlAI Agents22.0Insight HealthCompanyHealthcareArtificial IntelligenceClinical Documentation21.4Unframe AICompanyAi MlEnterprise AIAI Agents20.3ElyraCompanyRestaurant TechnologyReservationsArtificial Intelligence19.9CallDeskCompanyVoice AIConversational AIContact Center16.7DialogusCompanyAI AgentsConversational AI16.3Hello PatientCompanyHealthcareArtificial IntelligenceConversational AI16.1Callab AIVoice AIConversational AITelephonyContact Center1 API15.9CignaraCompanyArtificial IntelligenceConversational AICustomer Support12.4
Minimal 2 Almost no public developer surface
BoardyCompanyArtificial IntelligenceNetworkingProfessional Networking9.8Dot ProductCompanyAi MlArtificial Intelligence3.3

APIs with this tag (7)

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 →

Strong 1 Solid coverage with minor gaps
CloudTalk VoiceAgent APIVoiceAgent API ver. 1.0.056.7
Developing 3 Usable, with meaningful gaps to close
Deepgram Voice Agent APIThe Deepgram Voice Agent API is an end-to-end solution that combines speech-to-text, LLM orchestration, and...46.1PlayAI Voice Agents APIThe PlayAI Voice Agents API lets developers create, configure, and run conversational AI agents that proces...42.8Smallest AI Atoms (Voice Agents)The Atoms platform for building, testing, and deploying production voice agents - orchestrating Waves TTS a...41.2
Thin 2 Limited public surface area
LiveKit Agents APIFramework and runtime for voice / multimodal AI agents that join LiveKit rooms; integrates with LLM, STT, a...31.5Agora Conversational AI Engine APIThe Agora Conversational AI Engine enables building voice-enabled AI agents with sub-second response times ...30.6
Emerging 1 Early or largely undocumented
Callab AI APICallab AI's REST API, documented at docs.callab.ai/api-reference, is organized around REST principles with ...15.9

Companies reaching this through an API (4)

These companies publish an API, specification or operation carrying “Voice Agents” 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.

Agora CloudTalk Deepgram LiveKit

Score breakdown

Frequency
44.2
log-scaled weighted occurrences
Breadth
0.9
spread across providers
Quality lift
41.7
mean composite of providers using it
Cohesion
7.9
strength of nearest seed neighbor

Where this tag sits

Voice AI broader Conversational AI broader Voice broader

Related tags

Voice AI 20 co-occurrences Telephony 12 co-occurrences Conversational AI 24 co-occurrences Voice Cloning 5 co-occurrences Speech-to-Text 7 co-occurrences Text-to-Speech 8 co-occurrences Voice 19 co-occurrences

Where this tag comes from

Api tag7
Provider tag33
Openapi tag1
Openapi op tag1

Cohort brief

Auto-generated

The 33 providers in the APIs.io catalog tagged Voice Agents, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
33
all scored
Mean Kin Score
35.2
+12.3 vs catalog 22.9
Mean Agent Readiness
22.9
+11.0 vs catalog 11.9
Spread
3.3–81.8
median 35.5 · σ 17.1
How the 33 split by band
Exemplar 1Strong 2Developing 12Thin 6Emerging 10Minimal 2
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 34.6 17.6 +17 33
Access Clarity 41 26.5 +14.5 33
Developer Ergonomics 34.4 23.2 +11.2 33
Operational Transparency 21.6 13.7 +7.9 33
Discoverability 65.4 58.1 +7.3 33
Contract Governance 10.5 6.3 +4.2 33

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) 33% 14% +19
MCP server (first-party) 33% 12% +21
Agent Skills 0% 0% 0
OAuth scopes 15% 11% +4
Security 100% 98% +2
Arazzo workflows 3% 2% +1
Governance rules 24% 14% +10

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 ElevenLabs 81.8
  2. 2 Synthflow 60
  3. 3 Gridspace 59.3
  4. 4 SLNG 53.6
  5. 5 VoiceGenie 52.4
  6. 6 Phonic 51.7
  7. 7 Bolna 49.9
  8. 8 iCallAgent Public API 49.3
  9. 9 Gradium 47.7
  10. 10 Phonely 45.5
Top by Agent Readiness
  1. 1 Sarj AI Developer API 67.3
  2. 2 Phonic 56.9
  3. 3 Synthflow 54
  4. 4 Bolna 53.6
  5. 5 ElevenLabs 52.7
  6. 6 supernormal 45.9
  7. 7 iCallAgent Public API 36.5
  8. 8 VoiceGenie 35.8
  9. 9 Retell AI 30.1
  10. 10 SLNG 30
All 33 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 5 October 2026, across 29093 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

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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

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This tag 
curl "https://apis.io/api/v1/tags/voice-agents"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/voice-agents"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/voice-agents/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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