NumberHub

NumberHub provides a REST API for a prepaid USD wallet offering SMS verification numbers, number rentals, travel eSIM data plans, email OTP services, and residential proxy data packages. The platform enables developers to programmatically receive verification SMS and email, rent phone numbers, buy prepaid data-only travel eSIMs, and access proxy endpoints, with pricing and catalog updates reflected in real time. It supports idempotent operations via Idempotency-Key and detailed retry semantics for action endpoints.

NumberHub is listed with 1 API on the APIs.io network. Tagged areas include Telecommunications, SMS Verification, eSIM, and Residential Proxies.

NumberHub’s developer surface includes changelog, pricing, documentation, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.3/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 API

Telecommunications SMS Verification eSIM Residential Proxies

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 23.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 7.6 / 17

Operational Transparency 4.7 / 11

Contract Governance 0.5 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

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 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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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/numberhub: 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 →

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.

eSIM

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

NumberHub API

REST API for prepaid wallet, SMS verification, number rentals, eSIMs, email OTP and residential proxies.

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Numberhub Openapi Overlay

0 actions · update

DERIVED

Security Posture 2

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

Numberhub Domain Security

TLSv1.3 · HSTS

SECURITY

Numberhub Vulnerability Disclosure

no policy recorded

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 3

Authentication, authorization, and security posture

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

StatusPage

StatusPage

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: numberhub
name: NumberHub
image: https://numberhub.io/og.jpg
description: NumberHub provides a REST API for a prepaid USD wallet offering SMS verification numbers, number rentals, travel
  eSIM data plans, email OTP services, and residential proxy data packages. The platform enables developers to programmatically
  receive verification SMS and email, rent phone numbers, buy prepaid data-only travel eSIMs, and access proxy endpoints,
  with pricing and catalog updates reflected in real time. It supports idempotent operations via Idempotency-Key and detailed
  retry semantics for action endpoints.
url: https://raw.githubusercontent.com/api-evangelist/numberhub/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-28'
modified: '2026-09-28'
tags:
- Telecommunications
- SMS Verification
- eSIM
- Residential Proxies
tags_raw:
- Telecom
- API
- SMS Verification
- eSIM
- Residential Proxies
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: ChangeLog
  url: changelog/numberhub-changelog.yml
- type: Conformance
  url: conformance/numberhub-conformance.yml
- type: LLMsTxt
  url: llms/numberhub-llms.txt
- type: Hosts
  url: hosts/numberhub-hosts.yml
- type: Vendors
  url: vendors/numberhub-vendors.yml
- type: TermsOfService
  url: https://numberhub.io/terms/
- type: StatusPage
  url: https://numberhub.io/status/
- type: Security
  url: https://numberhub.io/security/
- type: PrivacyPolicy
  url: https://numberhub.io/privacy/
- type: Pricing
  url: https://numberhub.io/pricing/
- type: Login
  url: https://numberhub.io/app/login/
- type: ChangeLog
  url: https://numberhub.io/changelog/
- type: VulnerabilityDisclosure
  url: security/numberhub-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/numberhub-domain-security.yml
- type: Website
  url: https://numberhub.io/
- type: Documentation
  url: https://numberhub.io/api-docs/
apis:
- name: NumberHub API
  description: REST API for prepaid wallet, SMS verification, number rentals, eSIMs, email OTP and residential proxies.
  humanURL: https://numberhub.io/api-docs/
  baseURL: https://api.numberhub.io/v1
  aid: numberhub:numberhub-api
x-submission-notes: SMS verification numbers, rentals, travel eSIMs, email OTP, residential proxies. OpenAPI 3.1 https://numberhub.io/openapi.json
x-submission-probe: root 200, invented path 404, api-docs 200, OpenAPI 3.1 200 (44 paths)
x-submitted-by: info@numberhub.io (apis.io/add, 2026-09-28)
x-correction-request:
  requested: '2026-10-08'
  source:
  - https://github.com/api-evangelist/numberhub/issues/1
  request: 'hatmast2r (GitHub issue #1): the provider description says "rent eSIMs, send OTPs via SMS or email"; change that
    part to "receive verification SMS and email, rent phone numbers, and buy prepaid data-only travel eSIMs" -- the supported
    product flows in https://numberhub.io/api-docs/; the prepaid USD wallet and residential proxy wording can stay.'
  applied: '2026-10-08'
  applied_note: 'Verified live 2026-10-08: https://numberhub.io/api-docs/ 200 documents numbers (SMS and email are charge-on-receive:
    billed when the first code or verification email arrives), number rentals, and eSIM "Travel data" (GET /esim/regions);
    no outbound-send operation. Description phrase replaced as requested; wallet and residential proxy wording kept.'
x-enrichment:
  date: '2026-09-28'
  status: enriched
  artifacts_added: 12
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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