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. API access is available on custom plans, and SendHub also supports 100+ integrations via direct connectors and Zapier plus inbound-SMS webhooks. 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 21 more developer resources.

🌐 Visit website 📡 Source on GitHub
51.3/100 developing ▬ flat Agent 75/100 agent native Full breakdown ↓
scored 2026-07-23 · rubric v0.5
AccessSelf serve
6 APIs 1 MCP Servers
CompanySMSMessagingText MessagingCommunicationsMarketingWebhooksVoIP

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-23 · rubric v0.5
Composite quality — 51.3/100 · developing
Contract Quality 18.0 / 25
Developer Ergonomics 12.6 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 1.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 75/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 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 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

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

SendHub Authentication API

Log in via Username & Password and "Sign In As User"

SendHub Contact API

Create and manage contacts.

SendHub Group API

Create and manage groups.

SendHub Message API

Send and manage messages.

SendHub Profile API

View and manage your account and lines

SendHub Thread API

View and manage inbox threads.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

sendhub-mcp.yml

MCP SERVER

Event Specifications 1

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

Sendhub Webhooks

ASYNCAPI

Security Posture 2

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

Sendhub Authentication

apiKey/http · 3 schemes

SECURITY

Sendhub Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Sendhub Agentic Access

28 operations · 14 acting

28 operations · 14 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 DataModel
DataModel
 Lifecycle
Lifecycle
 Conformance
Conformance
 Webhooks
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 1

Status, limits, changes, and where to get help

Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 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

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
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. API access is available on
  custom plans, and SendHub also supports 100+ integrations via direct connectors and Zapier plus inbound-SMS webhooks. 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
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  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: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 16
  pass: local-v1
tags:
- 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: MCPServer
  url: mcp/sendhub-mcp.yml
- 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: WellKnown
  url: well-known/sendhub-well-known.yml
- type: Webhooks
  url: asyncapi/sendhub-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml