Sinch
Sinch is a cloud communications platform providing APIs for SMS, voice, video, fax, verification, and omnichannel messaging. It enables businesses to integrate global communication capabilities into their applications through programmable APIs for sending messages, making calls, verifying phone numbers, and managing sender identities across carrier networks worldwide.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Sinch the way a machine reads it — 105 machine-readable artifacts across 35 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 — Sinch scores 63.5/100 (strong), with a separate agent-readiness read of 59/100 (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 Sinch
Each block below is one kind of artifact we hold for Sinch. 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 35
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.
Sinch Access Control Lists API
Manage IP address access control lists for securing SIP trunk access.
Sinch Active Numbers API
Manage phone numbers that have been purchased and are active in your project, including updating configurations and releasing numbers.
Sinch Applications API
Manage Voice API applications including retrieving application configuration, updating settings, and managing assigned numbers.
Sinch Apps API
Manage Conversation API applications including channel credentials and webhook configurations.
Sinch Available Numbers API
Search for available phone numbers by country, type, and capabilities.
Sinch Available Regions API
List available regions and number types that can be provisioned.
Sinch Batches API
Batches are sets of SMS messages. You can send a single message or many messages at once. Batches are queued and sent at the rate limit in first-in-first-out order.
Sinch Brand Metadata API
Retrieve metadata about brand configuration options and requirements.
Sinch Brands API
Create, update, list, and delete customer brand profiles used for messaging campaigns and sender registrations.
Sinch Callouts API
Callouts are calls made to a phone number or app using the API. Supported types include conference callouts, text-to-speech callouts, and custom callouts.
Sinch Calls API
Manage ongoing calls or retrieve information about a call. Supports updating call properties and hanging up calls.
Sinch Capability API
Query channel capabilities for specific contacts to determine which channels can be used to reach them.
Sinch Conferences API
Manage ongoing conferences including retrieving conference info, muting or unmuting participants, and removing participants.
Sinch Contacts API
Manage contacts and their channel identities. Contacts group together underlying connected channel recipient identities.
Sinch Conversations API
Manage conversations which are collections of messages tied to a specific app and contact.
Sinch Delivery Reports API
Delivery reports provide the status of sent messages. Reports can be retrieved via the API or delivered via webhook callbacks.
Sinch Events API
Send and receive events such as composing indicators across supported channels.
Sinch Fax to Email API
Configure fax-to-email forwarding for incoming faxes on a service.
Sinch Faxes API
Send and manage faxes including sending to single or multiple recipients, listing sent and received faxes, and downloading fax content.
Sinch Groups API
Groups are sets of phone numbers (MSISDNs) that can be used as targets when sending SMS. A phone number can only occur once in a group.
Sinch Inbounds API
Inbound messages (Mobile Originated) are incoming messages sent to your short codes or long numbers from mobile phones.
Sinch KakaoTalk Senders API
Manage KakaoTalk sender identities for messaging through the Conversation API.
Sinch LINE Senders API
Manage LINE sender identities for messaging through the Conversation API.
Sinch Market Requirements API
Retrieve market-specific requirements for sender ID registration in different countries.
Sinch Messages API
Send and retrieve messages across all supported channels using a normalized message format.
Sinch Phone Numbers API
Assign and remove phone numbers from SIP trunks for inbound and outbound calling.
Sinch Projects API
The Projects API from Sinch — 3 operation(s) for projects.
Sinch RCS Senders API
Manage RCS sender identities for Rich Communication Services messaging through the Conversation API.
Sinch Registrations API
Create, update, delete, and track sender ID registrations for compliance with local messaging regulations.
Sinch SIP Endpoints API
Manage SIP endpoints that represent your SIP infrastructure such as PBX systems and contact centers.
Sinch SIP Trunks API
Create, view, update, and remove SIP trunks that connect your telephony infrastructure to the Sinch network.
Sinch Telegram Senders API
Manage Telegram bot sender identities for messaging through the Conversation API.
Sinch Transcoding API
Transcode generic message formats to channel-specific formats for preview purposes.
Sinch Verifications API
Start, report, and query the status of phone number verifications using SMS, flashcall, phone call, or data verification methods.
Sinch Webhooks API
Manage webhook endpoints for receiving callbacks on message delivery, inbound messages, and other events.
Scroll within the panel for all 35 ·
Open Collections 10
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).
Sinch Brands API
OPEN COLLECTIONSinch Conversation API
OPEN COLLECTIONSinch Elastic SIP Trunking API
OPEN COLLECTIONSinch Fax API
OPEN COLLECTIONSinch Numbers API
OPEN COLLECTIONSinch Provisioning API
OPEN COLLECTIONSinch Registration API
OPEN COLLECTIONSinch SMS API
OPEN COLLECTIONSinch Verification API
OPEN COLLECTIONSinch Voice API
OPEN COLLECTIONScroll within the panel for all 10 ·
Agent Skills 19
An agent skill packages the how-to for driving these APIs from an assistant — the prompts, the sequence, the guardrails — so the knowledge to use the API travels with it.
Packaged agent skills for driving this provider's APIs from an AI assistant.
sinch-10dlc
AGENT SKILLsinch-authentication
AGENT SKILLsinch-conversation-api
AGENT SKILLsinch-elastic-sip-trunking
AGENT SKILLsinch-fax-api
AGENT SKILLsinch-imported-numbers-hosting-orders
AGENT SKILLsinch-in-app-calling
AGENT SKILLsinch-mailgun-inspect
AGENT SKILLsinch-mailgun-optimize
AGENT SKILLsinch-mailgun-validate
AGENT SKILLsinch-mailgun
AGENT SKILLsinch-number-lookup-api
AGENT SKILLsinch-number-order-api
AGENT SKILLsinch-numbers-api
AGENT SKILLsinch-porting-api
AGENT SKILLsinch-provisioning-api
AGENT SKILLsinch-sdks
AGENT SKILLsinch-verification-api
AGENT SKILLsinch-voice-api
AGENT SKILLScroll within the panel for all 19 ·
GraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Sinch GraphQL Schema
This conceptual GraphQL schema covers the Sinch cloud communications platform, which provides APIs for SMS, voice, video, fax, verification, and omnichannel messaging. The schem...
GRAPHQLPricing 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.
Sinch Plans Pricing
PLANSRate 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.
Sinch 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.
Sinch Finops
FINOPSFeatures 16
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 16 ·
Event Specifications 4
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.
Sinch Conversation API Webhooks
Event-driven webhooks for the Sinch Conversation API. The Conversation API delivers contact messages, delivery receipts, and various notifications through HTTP POST callbacks. U...
ASYNCAPISinch SMS Webhooks
Event-driven webhooks for the Sinch SMS API. The SMS API delivers delivery reports and inbound messages via HTTP POST callbacks to your configured webhook URL. Delivery reports ...
ASYNCAPISinch Verification Callbacks
Event-driven callbacks for the Sinch Verification API. The Verification API sends HTTP POST callbacks to your application during the verification lifecycle. These include verifi...
ASYNCAPISinch Voice Callbacks
Event-driven callbacks for the Sinch Voice API. The Voice API sends HTTP POST callbacks to your application during the lifecycle of a voice call. Your application responds with ...
ASYNCAPISemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Sinch Context
JSON-LDSpectral Rules 3
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.
JSON Schema 3
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
JSON Structure 2
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Sinch Contact Structure
JSON STRUCTURESinch Message Structure
JSON STRUCTUREExamples 3
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 3
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.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
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 Sinch — 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.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
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 4
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/sinch · machine-readable index on apis.io