Retell AI
Retell AI provides voice AI infrastructure for building conversational agents with low-latency turn detection, interruption handling, tool calling, knowledge bases, and conversation flows. The Retell SDK exposes a published OpenAPI spec covering agents, calls, voices, knowledge bases, conversation flows, batches, and chat agents.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Retell AI the way a machine reads it — 87 machine-readable artifacts across 78 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Retell AI scores 45.8/100 (developing), with a separate agent-readiness read of 54/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Retell AI
Each block below is one kind of artifact we hold for Retell AI. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 78
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Retell AI Add Community Voice API
The Add Community Voice API from Retell AI — 1 operation(s) for add community voice.
Retell AI Add Knowledge Base Sources API
The Add Knowledge Base Sources API from Retell AI — 1 operation(s) for add knowledge base sources.
Retell AI Agent Playground Completion API
The Agent Playground Completion API from Retell AI — 1 operation(s) for agent playground completion.
Retell AI Clone Voice API
The Clone Voice API from Retell AI — 1 operation(s) for clone voice.
Retell AI Create Agent API
The Create Agent API from Retell AI — 1 operation(s) for create agent.
Retell AI Create Agent Version API
The Create Agent Version API from Retell AI — 1 operation(s) for create agent version.
Retell AI Create Batch Call API
The Create Batch Call API from Retell AI — 1 operation(s) for create batch call.
Retell AI Create Batch Test API
The Create Batch Test API from Retell AI — 1 operation(s) for create batch test.
Retell AI Create Chat Agent API
The Create Chat Agent API from Retell AI — 1 operation(s) for create chat agent.
Retell AI Create Chat API
The Create Chat API from Retell AI — 1 operation(s) for create chat.
Retell AI Create Chat Completion API
The Create Chat Completion API from Retell AI — 1 operation(s) for create chat completion.
Retell AI Create Conversation Flow API
The Create Conversation Flow API from Retell AI — 1 operation(s) for create conversation flow.
Retell AI Create Conversation Flow Component API
The Create Conversation Flow Component API from Retell AI — 1 operation(s) for create conversation flow component.
Retell AI Create Knowledge Base API
The Create Knowledge Base API from Retell AI — 1 operation(s) for create knowledge base.
Retell AI Create Phone Call API
The Create Phone Call API from Retell AI — 1 operation(s) for create phone call.
Retell AI Create Phone Number API
The Create Phone Number API from Retell AI — 1 operation(s) for create phone number.
Retell AI Create Retell Llm API
The Create Retell Llm API from Retell AI — 1 operation(s) for create retell llm.
Retell AI Create Sms Chat API
The Create Sms Chat API from Retell AI — 1 operation(s) for create sms chat.
Retell AI Create Test Case Definition API
The Create Test Case Definition API from Retell AI — 1 operation(s) for create test case definition.
Retell AI Create Web Call API
The Create Web Call API from Retell AI — 1 operation(s) for create web call.
Retell AI Delete Agent API
The Delete Agent API from Retell AI — 1 operation(s) for delete agent.
Retell AI Delete Agent Version API
The Delete Agent Version API from Retell AI — 1 operation(s) for delete agent version.
Retell AI Delete Call API
The Delete Call API from Retell AI — 1 operation(s) for delete call.
Retell AI Delete Chat Agent API
The Delete Chat Agent API from Retell AI — 1 operation(s) for delete chat agent.
Retell AI Delete Conversation Flow API
The Delete Conversation Flow API from Retell AI — 1 operation(s) for delete conversation flow.
Retell AI Delete Conversation Flow Component API
The Delete Conversation Flow Component API from Retell AI — 1 operation(s) for delete conversation flow component.
Retell AI Delete Knowledge Base API
The Delete Knowledge Base API from Retell AI — 1 operation(s) for delete knowledge base.
Retell AI Delete Knowledge Base Source API
The Delete Knowledge Base Source API from Retell AI — 1 operation(s) for delete knowledge base source.
Retell AI Delete Phone Number API
The Delete Phone Number API from Retell AI — 1 operation(s) for delete phone number.
Retell AI Delete Retell Llm API
The Delete Retell Llm API from Retell AI — 1 operation(s) for delete retell llm.
Retell AI Delete Test Case Definition API
The Delete Test Case Definition API from Retell AI — 1 operation(s) for delete test case definition.
Retell AI End Chat API
The End Chat API from Retell AI — 1 operation(s) for end chat.
Retell AI Get Agent API
The Get Agent API from Retell AI — 1 operation(s) for get agent.
Retell AI Get Agent Versions API
The Get Agent Versions API from Retell AI — 1 operation(s) for get agent versions.
Retell AI Get Batch Test API
The Get Batch Test API from Retell AI — 1 operation(s) for get batch test.
Retell AI Get Call API
The Get Call API from Retell AI — 1 operation(s) for get call.
Retell AI Get Chat Agent API
The Get Chat Agent API from Retell AI — 1 operation(s) for get chat agent.
Retell AI Get Chat Agent Versions API
The Get Chat Agent Versions API from Retell AI — 1 operation(s) for get chat agent versions.
Retell AI Get Chat API
The Get Chat API from Retell AI — 1 operation(s) for get chat.
Retell AI Get Concurrency API
The Get Concurrency API from Retell AI — 1 operation(s) for get concurrency.
Retell AI Get Conversation Flow API
The Get Conversation Flow API from Retell AI — 1 operation(s) for get conversation flow.
Retell AI Get Conversation Flow Component API
The Get Conversation Flow Component API from Retell AI — 1 operation(s) for get conversation flow component.
Retell AI Get Knowledge Base API
The Get Knowledge Base API from Retell AI — 1 operation(s) for get knowledge base.
Retell AI Get Mcp Tools API
The Get Mcp Tools API from Retell AI — 1 operation(s) for get mcp tools.
Retell AI Get Phone Number API
The Get Phone Number API from Retell AI — 1 operation(s) for get phone number.
Retell AI Get Retell Llm API
The Get Retell Llm API from Retell AI — 1 operation(s) for get retell llm.
Retell AI Get Test Case Definition API
The Get Test Case Definition API from Retell AI — 1 operation(s) for get test case definition.
Retell AI Get Test Run API
The Get Test Run API from Retell AI — 1 operation(s) for get test run.
Retell AI Get Voice API
The Get Voice API from Retell AI — 1 operation(s) for get voice.
Retell AI Import Phone Number API
The Import Phone Number API from Retell AI — 1 operation(s) for import phone number.
Retell AI List Agents API
The List Agents API from Retell AI — 1 operation(s) for list agents.
Retell AI List Batch Tests API
The List Batch Tests API from Retell AI — 2 operation(s) for list batch tests.
Retell AI List Calls API
The List Calls API from Retell AI — 2 operation(s) for list calls.
Retell AI List Chat Agents API
The List Chat Agents API from Retell AI — 1 operation(s) for list chat agents.
Retell AI List Chat API
The List Chat API from Retell AI — 1 operation(s) for list chat.
Retell AI List Chats API
The List Chats API from Retell AI — 1 operation(s) for list chats.
Retell AI List Conversation Flow Components API
The List Conversation Flow Components API from Retell AI — 2 operation(s) for list conversation flow components.
Retell AI List Conversation Flows API
The List Conversation Flows API from Retell AI — 2 operation(s) for list conversation flows.
Retell AI List Export Requests API
The List Export Requests API from Retell AI — 1 operation(s) for list export requests.
Retell AI List Knowledge Bases API
The List Knowledge Bases API from Retell AI — 1 operation(s) for list knowledge bases.
Retell AI List Phone Numbers API
The List Phone Numbers API from Retell AI — 2 operation(s) for list phone numbers.
Retell AI List Retell Llms API
The List Retell Llms API from Retell AI — 2 operation(s) for list retell llms.
Retell AI List Test Case Definitions API
The List Test Case Definitions API from Retell AI — 2 operation(s) for list test case definitions.
Retell AI List Test Runs API
The List Test Runs API from Retell AI — 2 operation(s) for list test runs.
Retell AI List Voices API
The List Voices API from Retell AI — 1 operation(s) for list voices.
Retell AI Publish Agent Version API
The Publish Agent Version API from Retell AI — 1 operation(s) for publish agent version.
Retell AI Register Phone Call API
The Register Phone Call API from Retell AI — 1 operation(s) for register phone call.
Retell AI Search Community Voice API
The Search Community Voice API from Retell AI — 1 operation(s) for search community voice.
Retell AI Stop Call API
The Stop Call API from Retell AI — 1 operation(s) for stop call.
Retell AI Update Agent API
The Update Agent API from Retell AI — 1 operation(s) for update agent.
Retell AI Update Call API
The Update Call API from Retell AI — 1 operation(s) for update call.
Retell AI Update Chat Agent API
The Update Chat Agent API from Retell AI — 1 operation(s) for update chat agent.
Retell AI Update Chat API
The Update Chat API from Retell AI — 1 operation(s) for update chat.
Retell AI Update Conversation Flow API
The Update Conversation Flow API from Retell AI — 1 operation(s) for update conversation flow.
Retell AI Update Conversation Flow Component API
The Update Conversation Flow Component API from Retell AI — 1 operation(s) for update conversation flow component.
Retell AI Update Phone Number API
The Update Phone Number API from Retell AI — 1 operation(s) for update phone number.
Retell AI Update Retell Llm API
The Update Retell Llm API from Retell AI — 1 operation(s) for update retell llm.
Retell AI Update Test Case Definition API
The Update Test Case Definition API from Retell AI — 1 operation(s) for update test case definition.
Scroll within the panel for all 78 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Retell SDK
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Retell Ai Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Retell Ai Finops
FINOPSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Retell AI WebSocket APIs
AsyncAPI 2.6 description of Retell AI's publicly documented WebSocket surfaces. All events are sourced from the official Retell AI documentation (https://docs.retellai.com) and ...
ASYNCAPISpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Retell AI API Rules
SPECTRALSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Retell AI — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
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