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 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.2/100 emerging ▲ 8.5 Agent 0/100 human only Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 API

Telecommunications SMS Verification eSIM Residential Proxies

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 23.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 8.0 / 17

Operational Transparency 4.2 / 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

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 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/numberhub/"><img src="https://apis.io/badge/numberhub/card.svg" alt="NumberHub on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 9.5 — up to +18.1 composite points Ask about this →
Contract Governance scores 4.5 — up to +11.5 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/numberhub/apis.yml: open an issue on github.com/api-evangelist/numberhub 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 →

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.

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

NumberHub

7 quoted statements, read from NumberHub's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

NumberHub

16 quoted statements, read from NumberHub's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

NumberHub

4 quoted statements, read from NumberHub's own page on 2026-11-10.

ELIGIBILITY

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 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

Pricing

UsageTerms

Company 1

The organization behind the API

Website

Website

Other 4

Properties that don't map to a standard resource type

Hosts

Vendors

DataProcessing

Eligibility

Source (apis.yml)

aid: numberhub
name: NumberHub
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
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/
- type: UsageTerms
  url: terms/numberhub-terms-of-service.yml
- type: DataProcessing
  url: privacy/numberhub-privacy-policy.yml
- type: Eligibility
  url: eligibility/numberhub-eligibility.yml
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-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

NumberHub API — frequently asked questions

Does NumberHub have an API?

Yes. APIs.io lists 1 API from NumberHub, including NumberHub API.

Is the NumberHub API ready for AI agents?

NumberHub has a Kin Score of 23.2 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/numberhub"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/numberhub/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/numberhub/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.