aid: sendhq
name: SendHQ
description: >-
  SendHQ is a transactional email API for product teams and AI agents — verified-domain sending,
  inbound email, hosted templates, drafts and attachments, delivery events, suppressions and
  workspace-scoped API keys, with a web dashboard at app.sendhq.cc. The public contract is an
  OpenAPI 3.1 document of 32 paths and 47 operations served from sendhq.cc/api/v1, authenticated
  with a bearer token or a session cookie. The largest operation groups are hosted templates,
  drafts and attachments, emails and threads, account and billing, domains, inbound email and
  deliverability. The company markets the product explicitly at coding agents.
type: Index
url: https://raw.githubusercontent.com/api-evangelist/sendhq/refs/heads/main/apis.yml
created: '2026-08-24'
modified: '2026-08-24'
specificationVersion: '0.23'
tags:
- Email
- Transactional Email
- Messaging
- Deliverability
- Agents
- Developer Tools
tags_raw:
- email api
- transactional email
- inbound email
- deliverability
apis:
- aid: sendhq:sendhq-api
  name: SendHQ API
  description: >-
    Transactional and inbound email — send, threads, drafts, attachments, hosted templates,
    domains and DNS verification, deliverability, suppressions, account and billing.
    32 paths, 47 operations, bearer token or session cookie.
  humanURL: https://sendhq.cc/docs/api-reference
  baseURL: https://sendhq.cc/api/v1
  tags:
  - Email
  - Transactional Email
  - Deliverability
  properties:
  - type: OpenAPI
    url: openapi/sendhq-api-openapi.yml
  - type: APIReference
    url: https://sendhq.cc/openapi.json
  - type: Documentation
    url: https://sendhq.cc/docs/api-reference
  - type: GettingStarted
    url: https://sendhq.cc/docs
  - type: Guides
    url: https://sendhq.cc/guides
common:
- type: LLMsTxt
  url: llms/sendhq-llms.txt
- type: Website
  url: https://sendhq.cc/
- type: DeveloperPortal
  url: https://sendhq.cc/docs
- type: Console
  url: https://app.sendhq.cc/
- type: Tools
  url: https://sendhq.cc/tools
- type: Templates
  url: https://sendhq.cc/templates
- type: Glossary
  url: https://sendhq.cc/glossary
- type: TermsOfService
  url: https://sendhq.cc/terms
- type: PrivacyPolicy
  url: https://sendhq.cc/privacy
- type: Support
  url: https://sendhq.cc/contact
maintainers:
- FN: SendHQ
  email: listings@sendhq.cc
  url: https://sendhq.cc/
x-provenance:
  added: '2026-08-24'
  method: searched
  source: https://sendhq.cc/openapi.json
  note: >-
    Submitted via apis.io/add on 2026-08-24 and auto-published by the gate at rating 51.
    THE HOST RETURNS A SOFT-200 AND IT NEARLY COST THEM THE LISTING. sendhq.cc answers any
    unknown path with an identical 1,212-byte HTML page — same SHA for /apis.json, for
    /for-agents, and for two invented control paths. Both URLs in the submission point at that
    page, so the first pass read the whole site as a catch-all and the record was almost declined
    on that basis. It was wrong. The real pages are real and each a different size: /docs 8,806,
    /docs/api-reference 8,306, /guides 13,363, plus tools, templates, glossary, terms, privacy and
    contact. The 1,212-byte page is only what a missing path returns.
    The specification is at /openapi.json — 48,625 bytes, OpenAPI 3.1, 32 paths, 47 operations,
    bearerAuth and sessionCookie — and was found from the site's own API-reference page rather
    than by guessing. The API is live and correctly gated: /api/v1/emails and /api/v1/domains both
    return 401 JSON.
    ONE THING FOR THE PROVIDER. SendHQ markets itself as an "AI-agent-ready email API" aimed at
    Claude, Codex, Cursor and OpenClaw, and its llms.txt is real. But /.well-known/agent.json,
    /.well-known/api-catalog and /.well-known/mcp all return the 1,212-byte catch-all rather than
    a document, so an agent discovering this provider the standard way finds nothing. Only the
    llms.txt and the OpenAPI are genuinely served.
    Every URL recorded here was fetched and its size checked against that catch-all so no artifact
    in this record is the placeholder page.