Sinch Verification API

The Sinch Verification API (Sinch Verify) is a dedicated phone number verification product for confirming that a user controls a given mobile number - the core of OTP, two-factor authentication (2FA), and anti-fraud sign-up flows. It supports four verification methods: SMS (one-time passcode), flash call (a missed call whose caller ID is the code), phone call / callout (a spoken or key-press code), and data (seamless / silent verification over the mobile data connection). A verification is started from your backend, the code or caller ID is reported back, and Sinch returns a pass/fail result; status can also be queried by id, by phone number, or by a custom reference. This entry is the product-specific treatment of the Verification API; the parent company Sinch is a global CPaaS provider (SMS, Voice, Email, Verification, Conversation) cataloged separately under the "sinch" provider entry.

Sinch Verification API publishes 3 API contracts indexed on the APIs.io network: Report Verification API, Start Verification API, and Verification Status API. Tagged areas include Number Verification, Phone Verification, OTP, 2FA, and CPaaS.

The Sinch Verification API catalog on APIs.io includes 1 Spectral governance ruleset.

Sinch Verification API’s developer surface includes engineering blog, authentication, documentation, signup flow, pricing, and 9 more developer resources.

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31.6/100 thin ▬ flat Agent 20/100 agent aware Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Number Verification Phone Verification OTP 2FA CPaaS SMS VerificationFlash CallTwo-Factor Authentication Identity VerificationSinch

Kin Score

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

Composite quality — 31.6/100 · thin

Contract Quality 9.4 / 19

Developer Ergonomics 6.3 / 15

Access Clarity 2.8 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 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 Telecommunications 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 18.4 — up to +16.3 composite points
Contract Quality scores 50.2 — up to +12.5 composite points
Operational Transparency scores 7.9 — up to +12.0 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/sinch-verify/apis.yml: open an issue on github.com/api-evangelist/sinch-verify 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
Biometrics Testing (biometric recognition vendors, identity verification depth)	undeclared	-	-	-

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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

Sinch Verification API Report Verification API

Report the received code or caller ID to complete a verification.

Sinch Verification API Start Verification API

Initiate a phone number verification.

Sinch Verification API Verification Status API

Query the status of pending and completed verifications.

Open Collections 4

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

Sinch Verification Report Verification API

OPEN COLLECTION

Sinch Verification Report Verification Start Verification API

OPEN COLLECTION

Sinch Verification Report Verification Verification Status API

OPEN COLLECTION

Sinch Verification API

OPEN COLLECTION

Sinch Verification API pricing

Not yet checked against Sinch Verification API's own pricing page. Compiled by API Evangelist on 2026-07-11 from sinch.com/pricing/; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free Trial free	—
Pay As You Go usage	—
Enterprise / Custom enterprise	—

Plan details, limits and sources →

Rate limits

Verification API Requests: not published requests
Per-Number Velocity: configurable verifications
Method / Country Rules: configurable verifications

Compiled by API Evangelist, not yet checked against Sinch Verification API's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Sinch Verify Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sinch Verify Rate Limits

3 limits

RATE LIMITS

Service Levels 1

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

Sinch Verification API

SLA

FinOps 1

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

Sinch Verify Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Sinch Verification API API Rules

61 rules · 59 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Sinch Verify Authentication

apiKey/http · 2 schemes

SECURITY

Sinch Verify Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Sinch Verify Agentic Access

6 operations · 3 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

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

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Pricing

Pricing

Company 4

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Website

Website

Source (apis.yml)

aid: sinch-verify
url: https://raw.githubusercontent.com/api-evangelist/sinch-verify/refs/heads/main/apis.yml
name: Sinch Verification API
kind: company
description: 'The Sinch Verification API (Sinch Verify) is a dedicated phone number verification product for confirming that
  a user controls a given mobile number - the core of OTP, two-factor authentication (2FA), and anti-fraud sign-up flows.
  It supports four verification methods: SMS (one-time passcode), flash call (a missed call whose caller ID is the code),
  phone call / callout (a spoken or key-press code), and data (seamless / silent verification over the mobile data connection).
  A verification is started from your backend, the code or caller ID is reported back, and Sinch returns a pass/fail result;
  status can also be queried by id, by phone number, or by a custom reference. This entry is the product-specific treatment
  of the Verification API; the parent company Sinch is a global CPaaS provider (SMS, Voice, Email, Verification, Conversation)
  cataloged separately under the "sinch" provider entry.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · 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/sinch-verify.png
x-docs-platform: redocly
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Number Verification
- Phone Verification
- OTP
- 2FA
- CPaaS
- SMS Verification
- Flash Call
- Two-Factor Authentication
- Identity Verification
- Sinch
created: '2026-07-11'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: sinch-verify:sinch-verify-report-verification-api
  name: Sinch Verification API Report Verification API
  description: Report the received code or caller ID to complete a verification.
  humanURL: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  baseURL: https://verification.api.sinch.com/verification/v1
  tags:
  - Report Verification
  properties:
  - type: OpenAPI
    url: openapi/sinch-verify-report-verification-api-openapi.yml
  - type: Documentation
    url: https://developers.sinch.com/docs/verification/introduction
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  - type: PostmanCollection
    url: collections/sinch-verify.postman_collection.json
  - type: OpenCollection
    url: collections/sinch-verify.opencollection.json
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verification-status
- aid: sinch-verify:sinch-verify-start-verification-api
  name: Sinch Verification API Start Verification API
  description: Initiate a phone number verification.
  humanURL: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  baseURL: https://verification.api.sinch.com/verification/v1
  tags:
  - Start Verification
  properties:
  - type: OpenAPI
    url: openapi/sinch-verify-start-verification-api-openapi.yml
  - type: Documentation
    url: https://developers.sinch.com/docs/verification/introduction
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  - type: PostmanCollection
    url: collections/sinch-verify.postman_collection.json
  - type: OpenCollection
    url: collections/sinch-verify.opencollection.json
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verification-status
- aid: sinch-verify:sinch-verify-verification-status-api
  name: Sinch Verification API Verification Status API
  description: Query the status of pending and completed verifications.
  humanURL: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  baseURL: https://verification.api.sinch.com/verification/v1
  tags:
  - Verification Status
  properties:
  - type: OpenAPI
    url: openapi/sinch-verify-verification-status-api-openapi.yml
  - type: Documentation
    url: https://developers.sinch.com/docs/verification/introduction
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verifications-start
  - type: PostmanCollection
    url: collections/sinch-verify.postman_collection.json
  - type: OpenCollection
    url: collections/sinch-verify.opencollection.json
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification
  - type: APIReference
    url: https://developers.sinch.com/docs/verification/api-reference/verification/verification-status
common:
- url: https://sinch.com/blog/
  type: Blog
- url: https://sinch.com/blog/feed/
  type: BlogRSS
- type: AgenticAccess
  url: agentic-access/sinch-verify-agentic-access.yml
- type: Authentication
  url: authentication/sinch-verify-authentication.yml
- type: DomainSecurity
  url: security/sinch-verify-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/sinch
- type: Website
  url: https://sinch.com/verification-api/
- type: Documentation
  url: https://developers.sinch.com/docs/verification/introduction
- type: DeveloperPortal
  url: https://developers.sinch.com/
- type: SignUp
  url: https://dashboard.sinch.com/signup
- type: Plans
  url: plans/sinch-verify-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sinch-verify-rate-limits.yml
- type: FinOps
  url: finops/sinch-verify-finops.yml
- type: Pricing
  url: https://sinch.com/pricing/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: sinch
x-relationship: product

Sinch Verification API — frequently asked questions

Does Sinch Verification API have an API?

Yes. APIs.io lists 3 APIs from Sinch Verification API, including Sinch Verification API Report Verification API, Sinch Verification API Start Verification API and Sinch Verification API Verification Status API.

Is there an OpenAPI specification for the Sinch Verification API?

Yes. APIs.io indexes 3 OpenAPI specifications for Sinch Verification API, each linked for download from this page.

How do I authenticate with the Sinch Verification API?

Sinch Verification API uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Sinch Verify Authentication.

How much does the Sinch Verification API cost?

APIs.io lists 3 pricing plans for Sinch Verification API, with each plan's price, limits and inclusions under Pricing on this page.

Is the Sinch Verification API ready for AI agents?

Sinch Verification API has a Kin Score of 31.6 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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