niche · 0.0

Voice Agents

Score 18.8 / 100 28 providers +2 via APIs 5 APIs Search apis.io →

Providers using this tag (28)

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

Exemplar 1 Complete, well-documented, and agent-ready
VapiArtificial IntelligenceVoice AIConversational AI15 APIs73.6
Strong 2 Solid coverage with minor gaps
GridspaceCompanyVoice AIConversational AI1 API62.0SynthflowVoiceNo-CodeTelephony1 API58.9
Developing 10 Usable, with meaningful gaps to close
SLNGCompanySpeechVoiceSpeech-to-Text7 APIs53.7VoiceGenieCompanyVoice AIConversational AISales Automation1 API52.7PhonicCompanyArtificial IntelligenceVoice AIConversational AI1 API52.1BolnaCompanyArtificial IntelligenceVoice AIConversational AI1 API49.6PhonelyArtificial IntelligenceVoice AIConversational AI2 APIs48.4GradiumCompanyAi MlVoice AIText-to-Speech1 API47.9CartesiaArtificial IntelligenceVoice AIText-to-SpeechSpeech-to-Text1 API44.8PlayHTVoiceTTSText-to-SpeechVoice Cloning1 API44.1Smallest AIArtificial IntelligenceText-to-SpeechVoiceReal-Time1 API43.1Sarj AI Developer APIVoice AIConversational AIArabic AI4 APIs41.5
Thin 5 Limited public surface area
LayercodeArtificial IntelligenceVoiceReal-Time1 API37.4VocodeVoice AITelephonyConversational AI1 API37.2supernormalCompanyMeetingsMeeting NotesTranscription1 API34.8Hamming AIArtificial IntelligenceLLMTesting1 API33.2Samora AICompanyConversational AIVoice AI1 API26.2
Emerging 9 Early or largely undocumented
Insight HealthCompanyHealthcareArtificial IntelligenceClinical Documentation23.0SkipprCompanyAi MlAI Agents21.1ElyraCompanyRestaurant TechnologyReservationsArtificial Intelligence19.8Unframe AICompanyAi MlEnterprise AIAgentic AI18.4Hello PatientCompanyHealthcareArtificial IntelligenceConversational AI16.6CallDeskCompanyVoice AIConversational AIContact Center15.7DialogusCompanyAI AgentsConversational AI15.3Callab AIVoice AIConversational AITelephonyContact Center1 API14.9CignaraCompanyArtificial IntelligenceConversational AICustomer-Support12.6
Minimal 1 Almost no public developer surface
Dot ProductCompanyAi MlArtificial Intelligence5.0

APIs with this tag (5)

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 →

Developing 2 Usable, with meaningful gaps to close
PlayAI Voice Agents APIThe PlayAI Voice Agents API lets developers create, configure, and run conversational AI agents that proces...44.1Smallest AI Atoms (Voice Agents)The Atoms platform for building, testing, and deploying production voice agents - orchestrating Waves TTS a...43.1
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...32.2Agora 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 ...14.9

Companies reaching this through an API (2)

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 LiveKit

Score breakdown

Frequency
41.7
log-scaled weighted occurrences
Breadth
0.8
spread across providers
Quality lift
40.6
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

Telephony 12 co-occurrences Voice AI 14 co-occurrences Voices 7 co-occurrences Calls 9 co-occurrences Conversational AI 19 co-occurrences Text-to-Speech 7 co-occurrences Speech-to-Text 5 co-occurrences Contact Center 8 co-occurrences

Where this tag comes from

Api tag5
Provider tag28

Cohort brief

Auto-generated

The 28 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
28
all scored
Mean Kin Score
35.8
+11.9 vs catalog 23.9
Mean Agent Readiness
21.3
+9.3 vs catalog 12
Spread
5–73.6
median 37.3 · σ 17.3
How the 28 split by band
Exemplar 1Strong 2Developing 10Thin 5Emerging 9Minimal 1
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 36.8 19.8 +17 28
Access Clarity 40.4 26.5 +13.9 28
Developer Ergonomics 36.4 23.4 +13 28
Operational Transparency 24.3 14 +10.3 28
Discoverability 66.9 61.2 +5.7 28
Contract Governance 10.5 6.4 +4.1 28

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) 29% 10% +19
MCP server (first-party) 36% 13% +23
Agent Skills 0% 0% 0
OAuth scopes 11% 11% 0
Security 100% 97% +3
Arazzo workflows 7% 2% +5
Governance rules 21% 14% +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 Vapi 73.6
  2. 2 Gridspace 62
  3. 3 Synthflow 58.9
  4. 4 SLNG 53.7
  5. 5 VoiceGenie 52.7
  6. 6 Phonic 52.1
  7. 7 Bolna 49.6
  8. 8 Phonely 48.4
  9. 9 Gradium 47.9
  10. 10 Cartesia 44.8
Top by Agent Readiness
  1. 1 Sarj AI Developer API 62.9
  2. 2 supernormal 48
  3. 3 Synthflow 42.1
  4. 4 Phonic 40.8
  5. 5 Bolna 37.4
  6. 6 Vapi 36.5
  7. 7 VoiceGenie 35.8
  8. 8 SLNG 30
  9. 9 Phonely 25.9
  10. 10 Gradium 25.7
All 28 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 15 September 2026, across 27661 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

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This tag 
curl "https://apis.io/api/v1/tags/voice-agents"
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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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