Telefoon

Telefoon is a cloud telephony and communications platform offering programmable voice, SMS, and number management APIs tailored for European markets. Built for GDPR compliance and EU regulatory requirements, Telefoon provides developers with REST APIs to build voice calling, SMS notification, number provisioning, and interactive voice response (IVR) solutions. The platform supports Dutch, Belgian, German, and broader European telecommunications infrastructure with local number availability and EU data residency.

Telefoon publishes 5 APIs on the APIs.io network, including Available Numbers API, Calls API, Conferences API, and 2 more. Tagged areas include Belgium, CPaaS, EU Data Residency, Europe, and GDPR Compliant.

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

Telefoon’s developer surface includes authentication, getting-started guide, pricing, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
34.3/100 thin ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessEnterprise
3 APIs
BelgiumCPaaSEU Data ResidencyEuropeGDPR CompliantMessagingNetherlandsNumber ProvisioningSMSTelephonyVoice

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 34.3/100 · thin
Contract Quality 10.3 / 19
Developer Ergonomics 3.0 / 15
Access Clarity 4.3 / 15
Operational Transparency 1.3 / 10
Contract Governance 1.2 / 9
Discoverability 6.1 / 8
Regulatory Posture 4.4 / 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
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/.
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 github.com/api-evangelist/telefoon: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

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

Telefoon Available Numbers API

Search available numbers

Telefoon Calls API

Make and manage voice calls

Telefoon Conferences API

Multi-party conferencing

Telefoon Messages API

Send and receive SMS messages

Telefoon Owned Numbers API

Manage owned numbers

Open Collections 9

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

API Collection

OPEN COLLECTION

Telefoon Number Management Available Numbers API

OPEN COLLECTION

Telefoon Number Management Available Numbers Calls API

OPEN COLLECTION

Telefoon Number Management Available Numbers Conferences API

OPEN COLLECTION

Telefoon Number Management Available Numbers Messages API

OPEN COLLECTION

Telefoon Number Management API

OPEN COLLECTION

Telefoon Number Management Available Numbers Owned Numbers API

OPEN COLLECTION

Telefoon SMS API

OPEN COLLECTION

Telefoon Voice API

OPEN COLLECTION

Scroll for all 9

Pricing Plans 1

Published pricing tiers and plan structures.

Telefoon Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Telefoon Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Telefoon Finops

FINOPS

Semantic Vocabularies 1

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

Telefoon Context

4 classes · 18 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Telefoon API Rules

5 rules · 4 warnings 1 info

SPECTRAL

Telefoon API Rules

9 rules · 3 errors 5 warnings 1 info

SPECTRAL

JSON Schema 1

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

Telefoon Call

10 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Telefoon Call Structure

0 properties

JSON STRUCTURE

Examples 2

Example request and response payloads for these APIs.

Telefoon Initiate Call Example

2 fields

EXAMPLE

Telefoon Send Sms Example

2 fields

EXAMPLE

Security Posture 2

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

Telefoon Authentication

apiKey · 1 scheme

SECURITY

Telefoon Domain Security

DNSSEC

SECURITY

Agentic Access 1

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

Telefoon Agentic Access

15 operations · 7 acting

15 operations · 7 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 Authentication
Authentication
 GDPR
GDPR

Operate 3

Status, limits, changes, and where to get help

RateLimits
RateLimits
 StatusPage
StatusPage
 Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Pricing
Pricing

Company 1

The organization behind the API

Blog
Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap

Source (apis.yml)

apis.yml Raw ↑ 
name: Telefoon
description: Telefoon is a cloud telephony and communications platform offering programmable voice, SMS, and number management
  APIs tailored for European markets. Built for GDPR compliance and EU regulatory requirements, Telefoon provides developers
  with REST APIs to build voice calling, SMS notification, number provisioning, and interactive voice response (IVR) solutions.
  The platform supports Dutch, Belgian, German, and broader European telecommunications infrastructure with local number availability
  and EU data residency.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
accessModel:
  pricing: enterprise
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Enterprise
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://www.telefoon.com/logo.png
url: https://www.telefoon.com
type: Index
tags:
- Belgium
- CPaaS
- EU Data Residency
- Europe
- GDPR Compliant
- Messaging
- Netherlands
- Number Provisioning
- SMS
- Telephony
- Voice
created: '2024-01-01'
modified: '2026-05-19'
apis:
- aid: telefoon:telefoon-available-numbers-api
  name: Telefoon Available Numbers API
  description: Search available numbers
  humanURL: https://developers.telefoon.com/voice
  baseURL: https://api.telefoon.com/v1/voice
  tags:
  - Available Numbers
  properties:
  - type: OpenAPI
    url: openapi/telefoon-available-numbers-api-openapi.yml
  - type: Documentation
    url: https://developers.telefoon.com/voice
  - type: Authentication
    url: https://developers.telefoon.com/authentication
  - type: GettingStarted
    url: https://developers.telefoon.com/getting-started
  - type: RateLimits
    url: https://developers.telefoon.com/rate-limits
  - type: Documentation
    url: https://developers.telefoon.com/sms
  - type: Documentation
    url: https://developers.telefoon.com/numbers
- aid: telefoon:telefoon-calls-api
  name: Telefoon Calls API
  description: Make and manage voice calls
  humanURL: https://developers.telefoon.com/voice
  baseURL: https://api.telefoon.com/v1/voice
  tags:
  - Calls
  properties:
  - type: OpenAPI
    url: openapi/telefoon-calls-api-openapi.yml
  - type: Documentation
    url: https://developers.telefoon.com/voice
  - type: Authentication
    url: https://developers.telefoon.com/authentication
  - type: GettingStarted
    url: https://developers.telefoon.com/getting-started
  - type: RateLimits
    url: https://developers.telefoon.com/rate-limits
  - type: Documentation
    url: https://developers.telefoon.com/sms
  - type: Documentation
    url: https://developers.telefoon.com/numbers
- aid: telefoon:telefoon-conferences-api
  name: Telefoon Conferences API
  description: Multi-party conferencing
  humanURL: https://developers.telefoon.com/voice
  baseURL: https://api.telefoon.com/v1/voice
  tags:
  - Conferences
  properties:
  - type: OpenAPI
    url: openapi/telefoon-conferences-api-openapi.yml
  - type: Documentation
    url: https://developers.telefoon.com/voice
  - type: Authentication
    url: https://developers.telefoon.com/authentication
  - type: GettingStarted
    url: https://developers.telefoon.com/getting-started
  - type: RateLimits
    url: https://developers.telefoon.com/rate-limits
  - type: Documentation
    url: https://developers.telefoon.com/sms
  - type: Documentation
    url: https://developers.telefoon.com/numbers
- aid: telefoon:telefoon-messages-api
  name: Telefoon Messages API
  description: Send and receive SMS messages
  humanURL: https://developers.telefoon.com/voice
  baseURL: https://api.telefoon.com/v1/voice
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/telefoon-messages-api-openapi.yml
  - type: Documentation
    url: https://developers.telefoon.com/voice
  - type: Authentication
    url: https://developers.telefoon.com/authentication
  - type: GettingStarted
    url: https://developers.telefoon.com/getting-started
  - type: RateLimits
    url: https://developers.telefoon.com/rate-limits
  - type: Documentation
    url: https://developers.telefoon.com/sms
  - type: Documentation
    url: https://developers.telefoon.com/numbers
- aid: telefoon:telefoon-owned-numbers-api
  name: Telefoon Owned Numbers API
  description: Manage owned numbers
  humanURL: https://developers.telefoon.com/voice
  baseURL: https://api.telefoon.com/v1/voice
  tags:
  - Owned Numbers
  properties:
  - type: OpenAPI
    url: openapi/telefoon-owned-numbers-api-openapi.yml
  - type: Documentation
    url: https://developers.telefoon.com/voice
  - type: Authentication
    url: https://developers.telefoon.com/authentication
  - type: GettingStarted
    url: https://developers.telefoon.com/getting-started
  - type: RateLimits
    url: https://developers.telefoon.com/rate-limits
  - type: Documentation
    url: https://developers.telefoon.com/sms
  - type: Documentation
    url: https://developers.telefoon.com/numbers
common:
- type: CapabilityMap
  url: capabilities/telefoon-capability-edges.yml
  name: Telefoon Business Capability Map
- type: AgenticAccess
  url: agentic-access/telefoon-agentic-access.yml
- type: DomainSecurity
  url: security/telefoon-domain-security.yml
- type: Authentication
  url: authentication/telefoon-authentication.yml
- type: Authentication
  url: https://developers.telefoon.com/authentication
- type: GettingStarted
  url: https://developers.telefoon.com/getting-started
- type: RateLimits
  url: https://developers.telefoon.com/rate-limits
- type: GDPR
  url: https://www.telefoon.com/gdpr
- type: StatusPage
  url: https://status.telefoon.com
- type: TermsOfService
  url: https://www.telefoon.com/terms
- type: PrivacyPolicy
  url: https://www.telefoon.com/privacy
- type: Pricing
  url: https://www.telefoon.com/pricing
- type: Support
  url: https://www.telefoon.com/support
- type: Blog
  url: https://blog.telefoon.com
maintainers:
- name: Telefoon API Team
  email: api-team@telefoon.com
  url: https://www.telefoon.com/about/api-team

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