SendHub

SendHub is a business text messaging platform for SMS/MMS marketing campaigns, two-way texting, appointment reminders, bulk messaging, SMS surveys, group messaging, and VoIP calling, used by more than 10,000 businesses. It exposes a REST-like v1 API at api.sendhub.com for programmatically managing contacts, groups, messages, inbox threads, account settings, and enterprise users, authenticated with a line username and API key (query params) or HTTP Basic. Published plans run Lite $19/mo to Basic $100/mo plus a quoted Custom tier, and every tier lists API access, though the developer page still says API access is custom-plan only. SendHub also supports 100+ integrations via direct connectors and Zapier plus inbound-SMS webhooks, and is a New Era Technology company. Surfaced as a 500 Global portfolio company and enriched by the API Evangelist pipeline.

SendHub publishes 6 APIs on the APIs.io network, including Authentication API, Contact API, Group API, and 3 more. Tagged areas include Company, SMS, Messaging, Text Messaging, and Communications.

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

SendHub’s developer surface includes documentation, API reference, pricing, engineering blog, support, signup flow, authentication, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

57.6/100 strong ▬ flat Agent 28/100 agent aware saas Full breakdown ↓
scored 2026-09-06 · rubric v0.19.0

AccessPaid

1 APIs

Company SMS Messaging Text Messaging Communications Marketing Webhook VoIP

Kin Score

Kin Score How this is scored →
scored 2026-09-06 · rubric v0.19.0

Composite quality — 57.6/100 · strong

Contract Quality 13.4 / 21

Developer Ergonomics 11.2 / 17

Access Clarity 13.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.9 / 10

Discoverability 6.5 / 9

Regulatory Posture 6.7 / 15

Agent readiness — 28/100 · 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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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.

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/.

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/sendhub: 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 6

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

Rate Limits 1

Documented rate limits and quota policies.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Login

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

DataModel

Lifecycle

Conformance

Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: sendhub
name: SendHub
description: SendHub is a business text messaging platform for SMS/MMS marketing campaigns, two-way texting, appointment reminders,
  bulk messaging, SMS surveys, group messaging, and VoIP calling, used by more than 10,000 businesses. It exposes a REST-like
  v1 API at api.sendhub.com for programmatically managing contacts, groups, messages, inbox threads, account settings, and
  enterprise users, authenticated with a line username and API key (query params) or HTTP Basic. Published plans run Lite
  $19/mo to Basic $100/mo plus a quoted Custom tier, and every tier lists API access, though the developer page still says
  API access is custom-plan only. SendHub also supports 100+ integrations via direct connectors and Zapier plus inbound-SMS
  webhooks, and is a New Era Technology company. Surfaced as a 500 Global portfolio company and enriched by the API Evangelist
  pipeline.
url: https://raw.githubusercontent.com/api-evangelist/sendhub/refs/heads/main/apis.yml
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
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-09-03'
  method: derived
image: https://www.sendhub.com/wp-content/uploads/2019/01/faviconsendhub-150x150.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 2
  pass: local-v1
tags:
- Company
- SMS
- Messaging
- Text Messaging
- Communications
- Marketing
- Webhook
- VoIP
tags_raw:
- Company
- SMS
- Messaging
- Text Messaging
- Communications
- Marketing
- Webhooks
- VoIP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: sendhub:sendhub-authentication-api
  name: SendHub Authentication API
  description: Log in via Username & Password and "Sign In As User"
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/sendhub-authentication-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- aid: sendhub:sendhub-contact-api
  name: SendHub Contact API
  description: Create and manage contacts.
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Contact
  properties:
  - type: OpenAPI
    url: openapi/sendhub-contact-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- aid: sendhub:sendhub-group-api
  name: SendHub Group API
  description: Create and manage groups.
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Group
  properties:
  - type: OpenAPI
    url: openapi/sendhub-group-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- aid: sendhub:sendhub-message-api
  name: SendHub Message API
  description: Send and manage messages.
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Message
  properties:
  - type: OpenAPI
    url: openapi/sendhub-message-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- aid: sendhub:sendhub-profile-api
  name: SendHub Profile API
  description: View and manage your account and lines
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Profile
  properties:
  - type: OpenAPI
    url: openapi/sendhub-profile-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- aid: sendhub:sendhub-thread-api
  name: SendHub Thread API
  description: View and manage inbox threads.
  humanURL: https://sendhub.com/developer/
  baseURL: https://api.sendhub.com
  tags:
  - Thread
  properties:
  - type: OpenAPI
    url: openapi/sendhub-thread-api-openapi.yml
  - type: Documentation
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
  - type: APIReference
    url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
common:
- type: Website
  url: https://sendhub.com
- type: DeveloperPortal
  url: https://sendhub.com/developer/
- type: Documentation
  url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- type: APIReference
  url: https://integrations.sendhub.com/SendHub-API-v1-Documentation.html
- type: Pricing
  url: https://sendhub.com/pricing/
- type: Blog
  url: https://sendhub.com/blogs/
- type: Support
  url: https://support.sendhub.com/hc/en-us
- type: SignUp
  url: https://app.sendhub.com/signup/
- type: Login
  url: https://app.sendhub.com/login
- type: TermsOfService
  url: https://sendhub.com/terms-of-use/
- type: PrivacyPolicy
  url: https://sendhub.com/privacy/
- type: GitHubOrganization
  url: https://github.com/sendhub
- type: Authentication
  url: authentication/sendhub-authentication.yml
- type: DomainSecurity
  url: security/sendhub-domain-security.yml
- type: AgenticAccess
  url: agentic-access/sendhub-agentic-access.yml
- type: Packages
  url: packages/sendhub-packages.yml
- type: SDKs
  url: packages/sendhub-packages.yml
- type: X-MCPServerCandidate
  url: mcp/sendhub-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/sendhub-llms.txt
- type: ErrorCatalog
  url: errors/sendhub-error-codes.yml
- type: Conventions
  url: conventions/sendhub-conventions.yml
- type: DataModel
  url: data-model/sendhub-data-model.yml
- type: Lifecycle
  url: lifecycle/sendhub-lifecycle.yml
- type: Conformance
  url: conformance/sendhub-conformance.yml
- type: Overlay
  url: overlays/sendhub-openapi-overlay.yaml
- type: Webhooks
  url: asyncapi/sendhub-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Plans
  url: plans/sendhub-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sendhub-rate-limits.yml
- type: GettingStarted
  url: https://www.sendhub.com/developer/

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