AgentPhone

AgentPhone is the telephony infrastructure layer for AI agents. A single REST API provisions real US/Canada phone numbers for agents with voice calling, SMS, MMS, and iMessage built in, plus unified webhooks, automatic conversation threading, real-time call transcription, hosted-LLM or webhook voice modes, and 10DLC/A2P compliance handled for you. Official Python and TypeScript SDKs and a published MCP server let agents buy numbers, place calls, and send messages through natural language. Founded 2026 (Y Combinator), used by teams at Google ADK, Replit, LangChain, Sim AI, and Alchemy.

AgentPhone publishes 13 APIs on the APIs.io network, including agent-webhooks API, agents API, calls API, and 10 more. Tagged areas include Company, Telephony, Phone Numbers, SMS, and Voice.

The AgentPhone catalog on APIs.io includes 1 event-driven AsyncAPI specification.

AgentPhone’s developer surface includes authentication, sandbox, documentation, getting-started guide, support, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub
50.9/100 developing ▬ flat Agent 90/100 agent native Full breakdown ↓
scored 2026-07-23 · rubric v0.5
AccessSelf serve
13 APIs 1 MCP Servers
CompanyTelephonyPhone NumbersSMSVoiceAI AgentsMessagingCommunicationsWebhooksMCPiMessage

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-23 · rubric v0.5
Composite quality — 50.9/100 · developing
Contract Quality 15.9 / 25
Developer Ergonomics 14.3 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 1.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 90/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/agentphone: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 13

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

AgentPhone agent-webhooks API

The agent-webhooks API from AgentPhone — 3 operation(s) for agent-webhooks.

AgentPhone agents API

The agents API from AgentPhone — 7 operation(s) for agents.

AgentPhone calls API

The calls API from AgentPhone — 8 operation(s) for calls.

AgentPhone contactCards API

The contactCards API from AgentPhone — 1 operation(s) for contactcards.

AgentPhone contacts API

The contacts API from AgentPhone — 3 operation(s) for contacts.

AgentPhone conversations API

The conversations API from AgentPhone — 5 operation(s) for conversations.

AgentPhone location API

The location API from AgentPhone — 2 operation(s) for location.

AgentPhone messages API

The messages API from AgentPhone — 2 operation(s) for messages.

AgentPhone numbers API

The numbers API from AgentPhone — 3 operation(s) for numbers.

AgentPhone registration API

The registration API from AgentPhone — 2 operation(s) for registration.

AgentPhone sub-accounts API

The sub-accounts API from AgentPhone — 2 operation(s) for sub-accounts.

AgentPhone usage API

The usage API from AgentPhone — 5 operation(s) for usage.

AgentPhone webhooks API

The webhooks API from AgentPhone — 5 operation(s) for webhooks.

Scroll for all 13

MCP Servers 1

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

agentphone-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Agentphone Rate Limits

0 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

AgentPhone Webhooks

Event surface AgentPhone delivers to a project-level or per-agent webhook URL. Generated by the API Evangelist enrichment pipeline from the published webhook documentation (http...

ASYNCAPI

Security Posture 2

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

Agentphone Authentication

http/oauth2 · 2 schemes

SECURITY

Agentphone Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Agentphone Agentic Access

67 operations · 32 acting

67 operations · 32 acting

AGENTIC

Resources

Get Started 5

Portal, sign-up, and the first successful call

Sandbox
Sandbox
 DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

AsyncAPI
AsyncAPI
 Documentation
Documentation

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 WellKnown
WellKnown
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Idempotency
Idempotency
 DataModel
DataModel
 Webhooks
Webhooks

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

Packages
Packages
 SDKs
SDKs
 GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits
RateLimits
 Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Other 1

Properties that don't map to a standard resource type

APICatalog
APICatalog

Source (apis.yml)

apis.yml Raw ↑ 
aid: agentphone
name: AgentPhone
description: AgentPhone is the telephony infrastructure layer for AI agents. A single REST API provisions real US/Canada phone
  numbers for agents with voice calling, SMS, MMS, and iMessage built in, plus unified webhooks, automatic conversation threading,
  real-time call transcription, hosted-LLM or webhook voice modes, and 10DLC/A2P compliance handled for you. Official Python
  and TypeScript SDKs and a published MCP server let agents buy numbers, place calls, and send messages through natural language.
  Founded 2026 (Y Combinator), used by teams at Google ADK, Replit, LangChain, Sim AI, and Alchemy.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://agentphone.ai/favicon.png?v=3
url: https://raw.githubusercontent.com/api-evangelist/agentphone/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: active
x-tier-reason: enriched-from-live-api
x-enriched: '2026-07-17'
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Telephony
- Phone Numbers
- SMS
- Voice
- AI Agents
- Messaging
- Communications
- Webhooks
- MCP
- iMessage
apis:
- aid: agentphone:agentphone-agent-webhooks-api
  name: AgentPhone agent-webhooks API
  description: The agent-webhooks API from AgentPhone — 3 operation(s) for agent-webhooks.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - agent-webhooks
  properties:
  - type: OpenAPI
    url: openapi/agentphone-agent-webhooks-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-agents-api
  name: AgentPhone agents API
  description: The agents API from AgentPhone — 7 operation(s) for agents.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - agents
  properties:
  - type: OpenAPI
    url: openapi/agentphone-agents-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-calls-api
  name: AgentPhone calls API
  description: The calls API from AgentPhone — 8 operation(s) for calls.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - calls
  properties:
  - type: OpenAPI
    url: openapi/agentphone-calls-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-contactcards-api
  name: AgentPhone contactCards API
  description: The contactCards API from AgentPhone — 1 operation(s) for contactcards.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - contactCards
  properties:
  - type: OpenAPI
    url: openapi/agentphone-contactcards-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-contacts-api
  name: AgentPhone contacts API
  description: The contacts API from AgentPhone — 3 operation(s) for contacts.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - contacts
  properties:
  - type: OpenAPI
    url: openapi/agentphone-contacts-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-conversations-api
  name: AgentPhone conversations API
  description: The conversations API from AgentPhone — 5 operation(s) for conversations.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - conversations
  properties:
  - type: OpenAPI
    url: openapi/agentphone-conversations-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-location-api
  name: AgentPhone location API
  description: The location API from AgentPhone — 2 operation(s) for location.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - location
  properties:
  - type: OpenAPI
    url: openapi/agentphone-location-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-messages-api
  name: AgentPhone messages API
  description: The messages API from AgentPhone — 2 operation(s) for messages.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - messages
  properties:
  - type: OpenAPI
    url: openapi/agentphone-messages-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-numbers-api
  name: AgentPhone numbers API
  description: The numbers API from AgentPhone — 3 operation(s) for numbers.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - numbers
  properties:
  - type: OpenAPI
    url: openapi/agentphone-numbers-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-registration-api
  name: AgentPhone registration API
  description: The registration API from AgentPhone — 2 operation(s) for registration.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - registration
  properties:
  - type: OpenAPI
    url: openapi/agentphone-registration-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-sub-accounts-api
  name: AgentPhone sub-accounts API
  description: The sub-accounts API from AgentPhone — 2 operation(s) for sub-accounts.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - sub-accounts
  properties:
  - type: OpenAPI
    url: openapi/agentphone-sub-accounts-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-usage-api
  name: AgentPhone usage API
  description: The usage API from AgentPhone — 5 operation(s) for usage.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - usage
  properties:
  - type: OpenAPI
    url: openapi/agentphone-usage-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
- aid: agentphone:agentphone-webhooks-api
  name: AgentPhone webhooks API
  description: The webhooks API from AgentPhone — 5 operation(s) for webhooks.
  humanURL: https://docs.agentphone.ai
  baseURL: https://api.agentphone.ai
  tags:
  - webhooks
  properties:
  - type: OpenAPI
    url: openapi/agentphone-webhooks-api-openapi.yml
  - type: APIReference
    url: https://docs.agentphone.ai/api-reference
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/agentphone-domain-security.yml
- type: AgenticAccess
  url: agentic-access/agentphone-agentic-access.yml
- type: Authentication
  url: authentication/agentphone-authentication.yml
- type: Packages
  url: packages/agentphone-packages.yml
- type: SDKs
  url: packages/agentphone-packages.yml
- type: WellKnown
  url: well-known/agentphone-well-known.yml
- type: APICatalog
  url: well-known/agentphone-api-catalog.json
- type: MCPServer
  url: mcp/agentphone-mcp.yml
- type: LLMsTxt
  url: llms/agentphone-llms.txt
- type: Conformance
  url: conformance/agentphone-conformance.yml
- type: ErrorCatalog
  url: errors/agentphone-error-codes.yml
- type: Lifecycle
  url: lifecycle/agentphone-lifecycle.yml
- type: Conventions
  url: conventions/agentphone-conventions.yml
- type: Idempotency
  url: conventions/agentphone-conventions.yml
- type: RateLimits
  url: rate-limits/agentphone-rate-limits.yml
- type: Sandbox
  url: sandbox/agentphone-sandbox.yml
- type: DataModel
  url: data-model/agentphone-data-model.yml
- type: AsyncAPI
  url: asyncapi/agentphone-webhooks-asyncapi.yml
- type: Webhooks
  url: asyncapi/agentphone-webhooks-asyncapi.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DeveloperPortal
  url: https://docs.agentphone.ai
- type: Documentation
  url: https://docs.agentphone.ai
- type: GettingStarted
  url: https://docs.agentphone.ai/welcome
- type: GitHubOrganization
  url: https://github.com/AgentPhone-AI
- type: Support
  url: https://discord.gg/sbNJDZbYmn
- type: Pricing
  url: https://agentphone.ai/pricing
- type: SignUp
  url: https://agentphone.ai/signup
- type: Login
  url: https://agentphone.ai/login
- type: TermsOfService
  url: https://agentphone.ai/terms
- type: PrivacyPolicy
  url: https://agentphone.ai/privacy
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence