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SendHQ

SendHQ API

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.

Documentation Provider Profile APIs.io OpenAPI GitHub

SendHQ API is published by SendHQ on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Email, Transactional Email, and Deliverability. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, API documentation, and a getting-started guide.

This API exposes 47 operations across 32 paths, organized into 7 resource areas, and defines 1 schema. It is described by OpenAPI 3.1.0, at version 2026-08-23.

Requests are made against a single base URL, https://sendhq.cc/api/v1.

47 operations 32 paths 1 schemas 7 DELETE19 GET2 PATCH17 POST2 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
2026-08-23
Base URL
https://sendhq.cc/api/v1
Authentication
HTTP Bearer, API Key
Resource Areas
7

Authentication & Security 2

SendHQ API declares 2 security schemes for authenticating requests. It accepts HTTP bearer tokens (re_…) (bearerAuth). An API key is passed in the cookie as sendhq_session_v2 (sessionCookie).

  • bearerAuth — Workspace API key. Keep it server-side.
  • sessionCookie — Browser session used for account administration.

Paths & Operations 47

Across 32 paths, the API surfaces 47 operations — 7 DELETE, 19 GET, 2 PATCH, 17 POST, 2 PUT. They span 7 resource areas: Emails and threads, Drafts and attachments, Hosted templates, Domains, Inbound email, Deliverability, Account and billing. Each is listed below with its method, path, parameters, and response codes.

Emails and threads 8

Send, retrieve, search, reply, and inspect delivery events.

POST
/emails
Send one email
post_emails 1 param body → 201400401404429
GET
/emails
List sent and received email
get_emails 12 params → 200400401404429
POST
/emails/batch
Send up to 100 individualized messages
post_emails_batch 1 param body → 201207400401404429
GET
/emails/{id}
Retrieve an email and its attachments
get_emails_id 1 param → 200400401404429
PATCH
/emails/{id}
Mark an email read or unread
patch_emails_id 1 param body → 200400401404429
DELETE
/emails/{id}
Delete a retained email
delete_emails_id 1 param → 200400401404429
GET
/emails/{id}/events
List delivery events for an email
get_emails_id_events 1 param → 200400401404429
GET
/threads/{id}
Retrieve a conversation chronologically
get_threads_id 1 param → 200400401404429
Drafts and attachments 9

Build composer flows with private attachment storage.

POST
/drafts
Create a composer draft
post_drafts body → 201400401404429
GET
/drafts
List composer drafts
get_drafts → 200400401404429
GET
/drafts/{id}
Retrieve a draft and attachments
get_drafts_id 1 param → 200400401404429
PUT
/drafts/{id}
Replace draft content
put_drafts_id 1 param body → 200400401404429
DELETE
/drafts/{id}
Discard a draft
delete_drafts_id 1 param → 200400401404429
POST
/drafts/{id}/attachments
Upload an attachment to a draft
post_drafts_id_attachments 2 params → 201400401404429
GET
/attachments/{id}
Download a private attachment
get_attachments_id 1 param → 200400401404429
DELETE
/attachments/{id}
Delete a private attachment
delete_attachments_id 1 param → 200400401404429
GET
/sending-identities
List verified sender identities
get_sending_identities → 200400401404429
Hosted templates 10

Draft, render, test, version, publish, and send reusable content.

GET
/templates
List hosted templates
get_templates 2 params → 200400401404429
POST
/templates
Create a hosted template
post_templates body → 201400401404429
GET
/templates/{id}
Retrieve drafts, releases, and usage
get_templates_id 1 param → 200400401404429
PUT
/templates/{id}/draft
Autosave a template draft
put_templates_id_draft 1 param body → 200400401404429
POST
/templates/{id}/draft
Create a new draft from the published release
post_templates_id_draft 1 param → 201400401404429
POST
/templates/{id}/render
Render exact server output
post_templates_id_render 1 param body → 200400401404429
POST
/templates/{id}/test
Send a test snapshot
post_templates_id_test 1 param body → 201400401404429
POST
/templates/{id}/publish
Publish an immutable template release
post_templates_id_publish 1 param → 201400401404429
POST
/templates/{id}/archive
Archive a template
post_templates_id_archive 1 param → 200400401404429
POST
/templates/{id}/restore
Restore an archived template
post_templates_id_restore 1 param → 200400401404429
Domains 5

Provision sender identities and understand DNS verification state.

POST
/domains
Add a sending domain
post_domains body → 201400401404429
GET
/domains
List domains and cached DNS state
get_domains → 200400401404429
GET
/domains/{id}
Retrieve domain setup details
get_domains_id 1 param → 200400401404429
DELETE
/domains/{id}
Delete a domain
delete_domains_id 1 param → 200400401404429
POST
/domains/{id}/verify
Refresh SES and DNS verification
post_domains_id_verify 1 param → 200400401404429
Inbound email 5

Create addresses and work with received conversations.

POST
/inboxes
Create an inbound address
post_inboxes body → 201400401404429
GET
/inboxes
List inbound addresses
get_inboxes 1 param → 200400401404429
GET
/inboxes/{id}
Retrieve an inbound address
get_inboxes_id 1 param → 200400401404429
PATCH
/inboxes/{id}
Rename, enable, or disable an inbox
patch_inboxes_id 1 param body → 200400401404429
DELETE
/inboxes/{id}
Delete an inbox while retaining messages
delete_inboxes_id 1 param → 200400401404429
Deliverability 4

Inspect events, reputation outcomes, and blocked recipients.

GET
/deliverability/stats
Retrieve 30-day delivery statistics
get_deliverability_stats → 200400401404429
GET
/suppressions
List workspace suppressions
get_suppressions → 200400401404429
DELETE
/suppressions/{email}
Remove an eligible bounce suppression
delete_suppressions_email 1 param → 200400401404429
GET
/blocked-recipients
List bounces, complaints, and unsubscribes
get_blocked_recipients 1 param → 200400401404429
Account and billing 6

Session-authenticated workspace administration.

GET
/profile
Retrieve account, usage, and subscription state
get_profile → 200400401404429
POST
/billing/checkout
Create a hosted checkout session
post_billing_checkout body → 200400401404429
POST
/billing/portal
Create a billing portal session
post_billing_portal → 200400401404429
POST
/keys
Create an API key
post_keys body → 201400401404429
GET
/keys
List API-key metadata
get_keys → 200400401404429
DELETE
/keys/{id}
Revoke an API key
delete_keys_id 1 param → 200400401404429

Schemas 1

The contract defines 1 schema that model the data the API accepts and returns. The most detailed is Error (1 property). Each schema is shown below with its type and property counts.

Error
object
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

sendhq-api-openapi.yml Raw ↑
#Email#Transactional Email#Deliverability
← Back to S APIs
API Details
ID
sendhq:sendhq-api
Base URL
https://sendhq.cc/api/v1
Docs
https://sendhq.cc/docs/api-reference
Provider
SendHQ
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This is an independent, third-party profile of SendHQ API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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