Truecaller

Truecaller is the Stockholm-based caller identification and spam-blocking platform (atomico and balderton-capital portfolio) used by hundreds of millions of people to know who is calling. For developers it publishes the Truecaller SDK for Android, iOS, mobile web, Flutter, React Native and Shopify - one-tap phone-number verification built on OAuth 2.0 with PKCE (authorization code + refresh token, OIDC-style userinfo) plus a drop-call / IM-OTP flow for non-Truecaller users. Truecaller for Business adds REST APIs on enterprise-portal-noneu.truecaller.com for verified business caller ID: call personalisation (dynamic caller ID), number management, verified campaigns, and Call Me Back / User Feedback webhooks.

Truecaller is listed with 4 APIs on the APIs.io network. Tagged areas include Company, Consumer, Caller ID, Phone Verification, and Identity.

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

Truecaller’s developer surface includes authentication, changelog, documentation, API reference, getting-started guide, support, engineering blog, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

49.4/100 developing ▬ flat Agent 31/100 agent ready Front door AI 2/6 trace Heartbeat 35/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

4 APIs

Company Consumer Caller ID Phone Verification Identity OAuth Spam Detection Communications Mobile SDK Authentication

Kin Score

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

Composite quality — 49.4/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 5.8 / 17

Operational Transparency 5.2 / 11

Contract Governance 1.9 / 10

Discoverability 6.7 / 9

Regulatory Posture 6.0 / 15

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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 6 / 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 Horizontal (data, software, accessibility, platform) 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 39.0 — up to +15.3 composite points
Access Clarity scores 34.2 — up to +13.2 composite points
Contract Governance scores 18.2 — up to +9.8 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/truecaller/apis.yml: open an issue on github.com/api-evangelist/truecaller 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
Mobile SDK Publishers (Play SDK Index, CocoaPods, ADA certification)	standard	45.0	-	-
Official SDKs on Packagist, pub.dev and Hex	standard	45.0	-	-

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.

APIs 4

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

Truecaller OAuth User Verification API

The backend half of the Truecaller OAuth SDK flow. After the mobile SDK returns an authorization code, partners exchange it at POST /v1/token (authorization_code grant with PKCE...

Truecaller Non-Truecaller User Verification API

Server-side validation for the drop-call / IM-OTP verification flow that covers users without the Truecaller app. GET /v1/otp/client/installation/phoneNumberDetail/{accessToken}...

Truecaller Web SDK Profile API

Profile retrieval for the mobile-web (deep link) verification flow. After a user consents in the Truecaller app, Truecaller POSTs the accessToken and requestId to the partner's ...

Truecaller for Business API

REST APIs for Truecaller's Verified Business Caller ID platform. Partners exchange a Key ID + Secret API Key for a 60-minute bearer token (POST /clients/{clientAccountId}/token)...

Event Specifications 1

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

Truecaller Webhooks

ASYNCAPI

Security Posture 3

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

Truecaller Authentication

oauth2/http bearer/apiKey · 5 schemes

SECURITY

Truecaller Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Truecaller Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Truecaller Scopes

6 scopes · authorizationCode/refreshToken

6 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

Components

Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

DomainSecurity

SecurityTxt

Authentication

OAuthScopes

Operate 3

Status, limits, changes, and where to get help

Deprecation

Deprecation

ChangeLog

ChangeLog

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

OpenIDConnect

OpenIDConnect

Source (apis.yml)

aid: truecaller
name: Truecaller
description: 'Truecaller is the Stockholm-based caller identification and spam-blocking platform (atomico and balderton-capital
  portfolio) used by hundreds of millions of people to know who is calling. For developers it publishes the Truecaller SDK
  for Android, iOS, mobile web, Flutter, React Native and Shopify - one-tap phone-number verification built on OAuth 2.0 with
  PKCE (authorization code + refresh token, OIDC-style userinfo) plus a drop-call / IM-OTP flow for non-Truecaller users.
  Truecaller for Business adds REST APIs on enterprise-portal-noneu.truecaller.com for verified business caller ID: call personalisation
  (dynamic caller ID), number management, verified campaigns, and Call Me Back / User Feedback webhooks.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.truecaller.com/open-graph.jpg
url: https://raw.githubusercontent.com/api-evangelist/truecaller/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- atomico
- balderton-capital
x-tier: profiled
x-tier-reason: enriched-from-portfolio-lead
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 17
  pass: local-v1
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Consumer
- Caller ID
- Phone Verification
- Identity
- OAuth
- Spam Detection
- Communications
- Mobile SDK
- Authentication
tags_raw:
- Company
- Consumer
- Caller ID
- Phone Verification
- Identity
- OAuth
- Spam Detection
- Communications
- Mobile SDK
- Authentication
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: VulnerabilityDisclosure
  url: security/truecaller-vulnerability-disclosure.yml
- name: Truecaller Responsible Disclosure & Bug Bounty
  url: https://www.truecaller.com/responsible-disclosure
  type: Security
- type: DomainSecurity
  url: security/truecaller-domain-security.yml
- name: Truecaller Packages and SDKs
  url: packages/truecaller-packages.yml
  type: Packages
- name: Truecaller SDKs (Android, iOS, Flutter)
  url: packages/truecaller-packages.yml
  type: SDKs
- name: Truecaller Well-Known Index
  url: well-known/truecaller-well-known.yml
  type: WellKnown
- name: Truecaller security.txt
  url: well-known/truecaller-security.txt
  type: SecurityTxt
- name: Truecaller OAuth OpenID Configuration
  url: well-known/truecaller-openid-configuration.json
  type: OpenIDConnect
- name: Truecaller llms.txt (Truecaller SDK docs)
  url: llms/truecaller-llms.txt
  type: LLMsTxt
- name: Truecaller for Business llms.txt
  url: llms/truecaller-business-llms.txt
  type: LLMsTxt
- name: Truecaller Authentication Profile
  url: authentication/truecaller-authentication.yml
  type: Authentication
- name: Truecaller OAuth Scopes
  url: scopes/truecaller-scopes.yml
  type: OAuthScopes
- name: Truecaller API Conventions
  url: conventions/truecaller-conventions.yml
  type: Conventions
- name: Truecaller Error Catalog
  url: errors/truecaller-error-codes.yml
  type: ErrorCatalog
- name: Truecaller Lifecycle
  url: lifecycle/truecaller-lifecycle.yml
  type: Lifecycle
- name: Truecaller Deprecated APIs
  url: https://docs.truecaller.com/truecaller-for-business/verified-business-api-documentation/deprecated-apis
  type: Deprecation
- name: Truecaller Conformance
  url: conformance/truecaller-conformance.yml
  type: Conformance
- name: Truecaller SDK Change Log
  url: changelog/truecaller-changelog.yml
  type: ChangeLog
- name: Truecaller Embedded Components
  url: components/truecaller-components.yml
  type: Components
- name: Truecaller Webhooks
  url: asyncapi/truecaller-webhooks.yml
  type: Webhooks
- name: Truecaller
  url: https://www.truecaller.com
  type: Website
- name: Truecaller for Developers
  url: https://developer.truecaller.com
  type: DeveloperPortal
- name: Truecaller SDK Documentation
  url: https://docs.truecaller.com/truecaller-sdk
  type: Documentation
- name: Truecaller for Business API Reference
  url: https://docs.truecaller.com/truecaller-for-business/verified-business-api-documentation/getting-started
  type: APIReference
- name: Truecaller SDK Getting Started
  url: https://docs.truecaller.com/truecaller-sdk/getting-started
  type: GettingStarted
- name: Truecaller Developer Support
  url: https://developer.truecaller.com/support
  type: Support
- name: Truecaller Developer Blog
  url: https://developer.truecaller.com/blog
  type: Blog
- name: Truecaller on GitHub
  url: https://github.com/truecaller
  type: GitHubOrganization
- name: Truecaller Developer Portal Sign Up
  url: https://sdk-console-noneu.truecaller.com/sign-up
  type: SignUp
- name: Truecaller Terms of Service
  url: https://www.truecaller.com/terms-of-service
  type: TermsOfService
- name: Truecaller Privacy Policy
  url: https://www.truecaller.com/privacy-policy
  type: PrivacyPolicy
apis:
- aid: truecaller:truecaller-oauth-api
  name: Truecaller OAuth User Verification API
  humanURL: https://docs.truecaller.com/truecaller-sdk/android/latest-oauth-sdk-3.3.0/integration-steps/integrating-with-your-backend
  baseURL: https://oauth-account-noneu.truecaller.com
  tags:
  - OAuth
  - OpenID Connect
  - Phone Verification
  - Identity
  - Tokens
  - UserInfo
  - Authentication
  tags_raw:
  - OAuth
  - OpenID Connect
  - Phone Verification
  - Identity
  - Token
  - UserInfo
  - Authentication
  description: The backend half of the Truecaller OAuth SDK flow. After the mobile SDK returns an authorization code, partners
    exchange it at POST /v1/token (authorization_code grant with PKCE code_verifier; refresh_token also supported) and fetch
    the verified user profile at GET /v1/userinfo with the Bearer access token. The host publishes OpenID Connect discovery
    at /.well-known/openid-configuration with /v1/auth, /v1/token, /v1/revoke, per-client JWKS, RS256 id tokens, and S256
    PKCE.
  properties:
  - url: https://docs.truecaller.com/truecaller-sdk/android/latest-oauth-sdk-3.3.0/integration-steps/integrating-with-your-backend/fetching-user-token
    type: Documentation
  - url: https://docs.truecaller.com/truecaller-sdk/android/latest-oauth-sdk-3.3.0/integration-steps/integrating-with-your-backend/fetching-user-profile
    type: APIReference
- aid: truecaller:truecaller-otp-verification-api
  name: Truecaller Non-Truecaller User Verification API
  humanURL: https://docs.truecaller.com/truecaller-sdk/android/latest-oauth-sdk-3.3.0/integration-steps/non-truecaller-user-verification/server-side-validation
  baseURL: https://sdk-otp-verification-noneu.truecaller.com
  tags:
  - Phone Verification
  - OTP
  - Missed Call
  - Validation
  description: Server-side validation for the drop-call / IM-OTP verification flow that covers users without the Truecaller
    app. GET /v1/otp/client/installation/phoneNumberDetail/{accessToken} (clientId header) returns the verified phone number
    and country code for the access token issued by the SDK.
  properties:
  - url: https://docs.truecaller.com/truecaller-sdk/android/latest-oauth-sdk-3.3.0/integration-steps/non-truecaller-user-verification/server-side-validation
    type: Documentation
- aid: truecaller:truecaller-web-sdk-profile-api
  name: Truecaller Web SDK Profile API
  humanURL: https://docs.truecaller.com/truecaller-sdk/mobile-websites/integrating-with-your-mobile-website/fetch-user-profile
  baseURL: https://profile4-noneu.truecaller.com
  tags:
  - Phone Verification
  - Profiles
  - Mobile Web
  tags_raw:
  - Phone Verification
  - Profile
  - Mobile Web
  description: Profile retrieval for the mobile-web (deep link) verification flow. After a user consents in the Truecaller
    app, Truecaller POSTs the accessToken and requestId to the partner's callback URL together with the profile endpoint (GET
    /v1/default with Bearer token), which returns the user's verified phone numbers, name, addresses and online identities.
  properties:
  - url: https://docs.truecaller.com/truecaller-sdk/mobile-websites/integrating-with-your-mobile-website/fetch-user-profile
    type: Documentation
- aid: truecaller:truecaller-for-business-api
  name: Truecaller for Business API
  humanURL: https://docs.truecaller.com/truecaller-for-business/verified-business-api-documentation/getting-started
  baseURL: https://enterprise-portal-noneu.truecaller.com
  tags:
  - Verified Business Caller ID
  - Call Personalisation
  - Number Management
  - Verified Campaigns
  - Webhook
  tags_raw:
  - Verified Business Caller ID
  - Call Personalisation
  - Number Management
  - Verified Campaigns
  - Webhooks
  description: REST APIs for Truecaller's Verified Business Caller ID platform. Partners exchange a Key ID + Secret API Key
    for a 60-minute bearer token (POST /clients/{clientAccountId}/token), then push dynamic caller-ID personalisation in real
    time (POST /v2/clients/{clientAccountId}/dynamic_call_record, 100 rps per token) or batch, check batch status, read dynamic
    labels, list/delist business numbers under feature sets, and run Verified Campaigns (bulk upload and exit via enterprise-webhooks-noneu.truecaller.com).
    Call Me Back and User Feedback events are delivered by configurable webhooks.
  properties:
  - url: https://docs.truecaller.com/truecaller-for-business/verified-business-api-documentation/getting-started
    type: Documentation
  - url: https://docs.truecaller.com/truecaller-for-business/verified-business-api-documentation/getting-started/generate-access-token
    type: GettingStarted

Truecaller API — frequently asked questions

Does Truecaller have an API?

Yes. APIs.io lists 4 APIs from Truecaller, including Truecaller OAuth User Verification API, Truecaller Non-Truecaller User Verification API and Truecaller Web SDK Profile API, and 1 more.

How do I authenticate with the Truecaller API?

Truecaller documents its authentication (oauth2/http bearer/apiKey · 5 schemes). The details are profiled on APIs.io as Truecaller Authentication.

Is the Truecaller API ready for AI agents?

Truecaller has a Kin Score of 49.4 out of 100 (developing) and an Agent Readiness score of 30.9 (agent-ready), scored by API Evangelist on 2026-11-06.

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