Rime

Rime is a realtime text-to-speech platform optimized for low-latency conversational agents. Models include Arcana v3, Arcana v2, Mist v3, and Mist v2. The TTS API supports streaming HTTP, WebSocket (binary and JSON), Server-Sent Events, and JSON envelopes for MP3, mu-law, OGG, and WAV audio.

Rime publishes 2 API contracts indexed on the APIs.io network, including Plants API, and 1 more. Tagged areas include Artificial Intelligence, Voice, Text-to-Speech, Real-Time, and Conversational AI.

The Rime catalog on APIs.io includes 1 Spectral governance ruleset.

Rime’s developer surface includes authentication, engineering blog, documentation, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.9/100 emerging ▬ flat Agent 39/100 agent ready Front door AI 4/6 moderate Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers

Artificial Intelligence Voice Text-to-Speech Real-Time Conversational AI

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 19.9/100 · emerging

Contract Quality 2.3 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.8 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.2 / 9

Discoverability 5.6 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 12.4 — up to +21.9 composite points
Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/rime-ai/apis.yml: open an issue on github.com/api-evangelist/rime-ai to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Speech and Voice AI	covered	34.5 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Rime TTS API

Realtime text-to-speech API supporting streaming HTTP, WebSocket, and SSE delivery for Arcana and Mist models. Authentication via API key. Audio formats include MP3, mu-law, OGG...

Rime Plants API

The Plants API from Rime — 2 operation(s) for plants.

Open Collections 2

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

OpenAPI Plant Store Plants API

OPEN COLLECTION

OpenAPI Plant Store

OPEN COLLECTION

MCP Servers 1

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

Rime MCP Server

Remote MCP server at mcp.rime.ai over HTTP; 6 tools listed.

MCP SERVER

Rime API pricing

Not yet checked against Rime's own pricing page. Compiled by API Evangelist on 2026-05-08 from www.rime.ai/pricing; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Pay as You Go usage	—
Growth subscription	—
Scale enterprise	—
Startup Grant free	—

Plan details, limits and sources →

Rate limits

Concurrent Generations (Pay as You Go): 5 concurrent generations
Concurrent Generations (Growth): 20 concurrent generations
Concurrent Generations (Scale): unlimited concurrent generations

Compiled by API Evangelist, not yet checked against Rime's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rime Ai Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rime Ai Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Rime

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Rime Ai Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Rime API Rules

46 rules · 44 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Rime Ai Authentication

http · 1 scheme

SECURITY

Rime Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Rime Ai Agentic Access

3 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Source (apis.yml)

aid: rime-ai
url: https://raw.githubusercontent.com/api-evangelist/rime-ai/refs/heads/main/apis.yml
name: Rime
kind: company
description: Rime is a realtime text-to-speech platform optimized for low-latency conversational agents. Models include Arcana
  v3, Arcana v2, Mist v3, and Mist v2. The TTS API supports streaming HTTP, WebSocket (binary and JSON), Server-Sent Events,
  and JSON envelopes for MP3, mu-law, OGG, and WAV audio.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/rime-ai.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: vercel
tags:
- Artificial Intelligence
- Voice
- Text-to-Speech
- Real-Time
- Conversational AI
tags_raw:
- AI
- Voice
- TTS
- Realtime
- Conversational
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
apis:
- aid: rime-ai:tts
  name: Rime TTS API
  description: Realtime text-to-speech API supporting streaming HTTP, WebSocket, and SSE delivery for Arcana and Mist models.
    Authentication via API key. Audio formats include MP3, mu-law, OGG, and WAV. List voice and voice details endpoints provide
    voice catalog metadata.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.rime.ai/api-reference
  baseURL: https://users.rime.ai
  tags:
  - Text-to-Speech
  - Streaming
  - WebSocket
  - SSE
  - Real-Time
  tags_raw:
  - TTS
  - Streaming
  - WebSocket
  - SSE
  - Realtime
  properties:
  - type: Documentation
    url: https://docs.rime.ai/api-reference
  - type: Pricing
    url: https://www.rime.ai/pricing
  - type: LlmsText
    url: https://docs.rime.ai/llms.txt
- aid: rime-ai:rime-ai-plants-api
  name: Rime Plants API
  description: The Plants API from Rime — 2 operation(s) for plants.
  humanURL: https://docs.rime.ai/api-reference
  baseURL: https://users.rime.ai
  tags:
  - Plants
  properties:
  - type: OpenAPI
    url: openapi/rime-ai-plants-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/rime-ai-agentic-access.yml
- type: DomainSecurity
  url: security/rime-ai-domain-security.yml
- type: Authentication
  url: authentication/rime-ai-authentication.yml
- url: https://rime.ai/resources/
  type: Blog
- type: LinkedIn
  url: https://www.linkedin.com/company/rime-ai
- type: Website
  url: https://rime.ai/
- type: Documentation
  url: https://docs.rime.ai/
- type: Plans
  url: plans/rime-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/rime-ai-rate-limits.yml
- type: FinOps
  url: finops/rime-ai-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Rime API — frequently asked questions

Does Rime have an API?

Yes. APIs.io lists 2 APIs from Rime, including Rime TTS API and Rime Plants API.

Is there an OpenAPI specification for the Rime API?

Yes. APIs.io indexes 1 OpenAPI specification for Rime, each linked for download from this page.

How do I authenticate with the Rime API?

Rime uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Rime Ai Authentication.

How much does the Rime API cost?

APIs.io lists 4 pricing plans for Rime, with each plan's price, limits and inclusions under Pricing on this page.

Does Rime have an MCP server?

Yes. APIs.io lists 1 MCP server for Rime: Remote MCP server at mcp.rime.ai over HTTP; 6 tools listed.

Is the Rime API ready for AI agents?

Rime has a Kin Score of 19.9 out of 100 (emerging) and an Agent Readiness score of 38.5 (agent-ready), scored by API Evangelist on 2026-11-06.

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