Telesign

Telesign provides a comprehensive suite of communications and security APIs enabling businesses to verify phone numbers, send SMS and voice messages, and assess fraud risk. Core offerings include SMS messaging, voice calls, multi-channel verification (OTP/MFA), phone number intelligence (PhoneID), reputation scoring, and silent verification. Telesign serves thousands of enterprises globally for account security, fraud prevention, and customer communications.

Telesign publishes 4 APIs on the APIs.io network, including Fraud Scoring API, Messaging API, Phone Intelligence API, and 1 more. Tagged areas include Authentication, Communications, Fraud Prevention, Phone Intelligence, and SMS.

The Telesign catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Telesign’s developer surface includes authentication, pricing, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.1/100 developing ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreeSelf serveFree trial⚡ Free to try

4 APIs

Authentication Communications Fraud Prevention Phone Intelligence SMS Verification

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.1/100 · developing

Contract Quality 11.2 / 19

Developer Ergonomics 3.4 / 15

Access Clarity 6.7 / 15

Operational Transparency 2.3 / 10

Contract Governance 0.9 / 9

Discoverability 5.6 / 8

Regulatory Posture 5.4 / 15

Create-or-Update Ergonomics 2.8 / 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

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/.

OPEN COLLECTION

Scroll for all 9

Pricing Plans 1

Published pricing tiers and plan structures.

Telesign Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Telesign Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Telesign Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Telesign Context

3 classes · 5 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Telesign API Rules

6 rules · 5 warnings 1 info

SPECTRAL

Telesign API Rules

12 rules · 4 errors 7 warnings

SPECTRAL

JSON Schema 12

Standalone JSON Schema definitions for this provider's data models.

LocationInfo

Example request and response payloads for these APIs.

Telesign Create Verification Example

4 fields

EXAMPLE

Telesign Phoneid Lookup Example

4 fields

EXAMPLE

Telesign Send Sms Example

4 fields

EXAMPLE

Security Posture 3

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

Telesign Authentication

http · 1 scheme

SECURITY

Telesign Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Telesign Trust Center

SOC 2, ISO 27001, HIPAA, GDPR

SECURITY

Agentic Access 1

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

Telesign Agentic Access

7 operations · 5 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: telesign
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: free
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/telesign.png
name: Telesign
description: Telesign provides a comprehensive suite of communications and security APIs enabling businesses to verify phone
  numbers, send SMS and voice messages, and assess fraud risk. Core offerings include SMS messaging, voice calls, multi-channel
  verification (OTP/MFA), phone number intelligence (PhoneID), reputation scoring, and silent verification. Telesign serves
  thousands of enterprises globally for account security, fraud prevention, and customer communications.
url: https://raw.githubusercontent.com/api-evangelist/telesign/refs/heads/main/apis.yml
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Authentication
- Communications
- Fraud Prevention
- Phone Intelligence
- SMS
- Verification
apis:
- aid: telesign:voice-api
  name: Telesign Voice API
  description: Send voice messages including OTPs, alerts, and notifications to phone numbers worldwide. Supports text-to-speech
    message delivery and call status tracking.
  humanURL: https://developer.telesign.com/enterprise/docs/voice-get-started
  baseURL: https://rest-ww.telesign.com/v1
  tags:
  - OTP
  - Telecommunications
  - Voice
  properties:
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/voice-get-started
- aid: telesign:telesign-fraud-scoring-api
  name: Telesign Fraud Scoring API
  description: Phone number reputation and fraud risk scoring
  humanURL: https://developer.telesign.com/enterprise/docs/sms-get-started
  baseURL: https://rest-ww.telesign.com/v1
  tags:
  - Fraud Scoring
  properties:
  - type: OpenAPI
    url: openapi/telesign-fraud-scoring-api-openapi.yml
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/sms-get-started
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/phoneid-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/verify-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/score-api-overview
- aid: telesign:telesign-messaging-api
  name: Telesign Messaging API
  description: Send and track SMS messages
  humanURL: https://developer.telesign.com/enterprise/docs/sms-get-started
  baseURL: https://rest-ww.telesign.com/v1
  tags:
  - Messaging
  properties:
  - type: OpenAPI
    url: openapi/telesign-messaging-api-openapi.yml
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/sms-get-started
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/phoneid-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/verify-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/score-api-overview
- aid: telesign:telesign-phone-intelligence-api
  name: Telesign Phone Intelligence API
  description: Phone number lookup and intelligence operations
  humanURL: https://developer.telesign.com/enterprise/docs/sms-get-started
  baseURL: https://rest-ww.telesign.com/v1
  tags:
  - Phone Intelligence
  properties:
  - type: OpenAPI
    url: openapi/telesign-phone-intelligence-api-openapi.yml
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/sms-get-started
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/phoneid-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/verify-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/score-api-overview
- aid: telesign:telesign-verification-api
  name: Telesign Verification API
  description: Create, retrieve, and update verification processes
  humanURL: https://developer.telesign.com/enterprise/docs/sms-get-started
  baseURL: https://rest-ww.telesign.com/v1
  tags:
  - Verification
  properties:
  - type: OpenAPI
    url: openapi/telesign-verification-api-openapi.yml
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/sms-get-started
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/phoneid-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/verify-api-overview
  - type: Documentation
    url: https://developer.telesign.com/enterprise/docs/score-api-overview
common:
- type: AgenticAccess
  url: agentic-access/telesign-agentic-access.yml
- type: TrustCenter
  url: security/telesign-trust-center.yml
- type: DomainSecurity
  url: security/telesign-domain-security.yml
- type: Authentication
  url: authentication/telesign-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/telesign
- type: Website
  url: https://www.telesign.com/
- type: DeveloperPortal
  url: https://developer.telesign.com/enterprise
- type: Authentication
  url: https://developer.telesign.com/enterprise/docs/authentication
- type: StatusPage
  url: https://status.telesign.com/
- type: Pricing
  url: https://www.telesign.com/pricing/
- type: TermsOfService
  url: https://www.telesign.com/terms-conditions/
- type: GitHubOrganization
  url: https://github.com/TeleSign
- type: Integrations
  url: https://www.telesign.com/partners
- type: Blog
  url: https://www.telesign.com/blog
integrations:
- name: Telesign
- name: referral
- name: Growth
- name: web tool set
- name: amplify icons
- name: shield
- name: suitcase
- name: Linkedin logo in white
- name: Facebook logo in white
- name: Youtube logo in white
- name: Proximus global white
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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