Providers using this tag (27)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 1 Complete, well-documented, and agent-ready
Strong 2 Solid coverage with minor gaps
Thin 16 Limited public surface area
APIs with this tag (20)
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 1 Complete, well-documented, and agent-ready
Strong 1 Solid coverage with minor gaps
Developing 4 Usable, with meaningful gaps to close
Deepdub TTS APIThe TTS API from Deepdub — 1 operation(s) for tts.Gradium TTS APIText-to-Speech endpoints for converting text to audioKugelAudio Tts APIThe Tts API from KugelAudio — 1 operation(s) for tts.Gemini Text-to-Speech APINative audio generation text-to-speech capabilities through the Gemini API, supporting single and multi-spe...
Thin 13 Limited public surface area
Fish Audio Tts APIThe Tts API from Fish Audio — 2 operation(s) for tts.PlayAI Text-to-Speech APIThe PlayAI Text-to-Speech API converts text into natural, human-like speech using the PlayDialog 1.0, Dialo...PlayHT TTS APIText-to-speech generation, streaming, and async jobs.Respeecher tts APIThe tts API from Respeecher — 1 operation(s) for tts.LiveKit Agents APIFramework and runtime for voice / multimodal AI agents that join LiveKit rooms; integrates with LLM, STT, a...Inworld AI TTS APIText-to-Speech synthesisInworld Text-to-Speech APITTS-2 and TTS-1.5 (Max/Mini) models for character voice synthesis. Priced per 1M characters with plan-tier ...Creed tts APIThe tts API from Creed — 2 operation(s) for tts.CitiConnect APICitiConnect is the corporate treasury and trade integration channel within Citi's Treasury and Trade Soluti...CitiConnect FX (Real-Time FX) APIThe CitiConnect FX API provides real-time foreign-exchange information and execution for corporate treasury...CitiConnect Statements and Reporting APIThe CitiConnect Statements and Reporting API delivers self-service reports, account statements, intraday an...CitiConnect WorldLink Payment Services APIThe CitiConnect WorldLink Payment Services API delivers cross-border, multi-currency payment capabilities w...Rime TTS APIRealtime text-to-speech API supporting streaming HTTP, WebSocket, and SSE delivery for Arcana and Mist mode...
Emerging 1 Early or largely undocumented
Score breakdown
Frequency
45.4
log-scaled weighted occurrences
Breadth
0.7
spread across providers
Quality lift
46.5
mean composite of providers using it
Cohesion
8.1
strength of nearest seed neighbor
Related tags
Speech Synthesis 10 co-occurrences
Voice Cloning 9 co-occurrences
Text-to-Speech 15 co-occurrences
Voices 10 co-occurrences
Voice 17 co-occurrences
Audio 13 co-occurrences
Models 6 co-occurrences
Conversational AI 5 co-occurrences
Where this tag comes from
Provider tag15
Api tag20
Openapi tag10
Openapi op tag19
Cohort brief
Auto-generatedThe 27 providers in the APIs.io catalog tagged TTS, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
27
all scored
Mean Kin Score
38.1
+17.4 vs catalog 20.7
Mean Agent Readiness
20.8
+11.1 vs catalog 9.7
Spread
15.8–71.2
median 37 · σ 12
How the 27 split by band
Exemplar 1Strong 2Developing 6Thin 16Emerging 2Minimal 0
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 48.4 | 17.5 | +30.9 | 27 |
| Access Clarity | 39.2 | 22.3 | +16.9 | 27 |
| Developer Ergonomics | 33.2 | 17.9 | +15.3 | 27 |
| Discoverability | 75.3 | 60.4 | +14.9 | 27 |
| Operational Transparency | 22.9 | 11.3 | +11.6 | 27 |
| Contract Governance | 9.3 | 6.4 | +2.9 | 27 |
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
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 19% | 16% | +3 |
| MCP server (first-party) | 0% | 7% | -7 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 0% | 9% | -9 |
| Security | 100% | 88% | +12 |
| Arazzo workflows | 7% | 2% | +5 |
| Governance rules | 26% | 13% | +13 |
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 NVIDIA NIM 71.2
- 2 Amazon Polly 59.6
- 3 Convai 54.3
- 4 Deepdub 52
- 5 Gradium 50.8
- 6 KugelAudio 50.7
- 7 Gemini 46
- 8 Listnr 39.5
- 9 Uberduck 39.5
- 10 WellSaid Labs 39
Top by Agent Readiness
- 1 Deepdub 31.5
- 2 KugelAudio 28.8
- 3 NVIDIA NIM 28.8
- 4 Creed 28.2
- 5 Amazon Polly 28.1
- 6 Gradium 25.7
- 7 Resemble AI 25.5
- 8 Rime 25.5
- 9 Respeecher 24.1
- 10 Inworld AI 23.7
All 27 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
25 August 2026, across 26891
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.
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