Esendex API

Name: Esendex API API
Brand: Esendex API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentCommunicationsSms Messagingbasic, apiKey17 EndpointsREST

For Agents

Send SMS, voice, rich content, and surveys, read inbox messages, manage scheduled batches, and subscribe to delivery webhooks via Esendex. Authenticate with HTTP Basic or an Authorization header API key.

Connect the Esendex API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Esendex API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Install Jentic One Beta (Self-Hosted)

Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Esendex API API.

Dispatch one or many SMS messages in a single call via /messagedispatcher

Estimate the cost of a message before sending with /messages/information

List message headers and read inbox messages received from customers

Pull a conversation thread by phone number for two-way messaging UIs

GET STARTED

Start building with Esendex API API

Explore with Jentic

View OpenAPI Document

Jentic publishes the only available OpenAPI document for Esendex API, keeping it validated and agent-ready.

Jentic publishes the only available OpenAPI specification for the Esendex API, keeping it validated and agent-ready. Esendex provides SMS, voice, rich-content messaging, surveys, and webhook subscriptions for business communications. The 17 endpoints cover the full message lifecycle: dispatch via /messagedispatcher, list message headers and inbox, read conversations by phone number, manage scheduled batches, send rich content and surveys, and create webhook subscriptions per account. Authentication is dual: HTTP Basic for the historical SMS endpoints and an apiKey Authorization header for newer rich-content and survey routes.

Use Cases

Patterns agents use Esendex API API for, with concrete tasks.

★ Two-Way SMS Customer Engagement at Scale

Operations teams running SMS support and notifications need send, read, and conversation-thread endpoints to power agent UIs and automation. Esendex's /messagedispatcher, /inbox/messages, and /conversation/{phonenumber}/messages endpoints provide the full two-way flow without a separate inbound parser, so an agent can read, classify, and reply in the same loop.

Call POST /messagedispatcher with the recipient number and body, then GET /conversation/{phonenumber}/messages to confirm the new outbound entry.

Scheduled SMS Marketing Campaigns

Marketing teams scheduling SMS sends need a batch creation and management surface. Esendex's /messagebatches endpoints let an agent name and schedule batches, list past sends, and cancel a pending schedule before it fires, replacing custom queue plumbing with native scheduling.

Call POST /messagedispatcher with a batch payload and a future send-at timestamp, then PUT /messagebatches/{id} to set a friendly name.

Rich Content and Survey Outreach

Brands using rich messaging or running CSAT surveys via SMS need richer content than 160-character text. Esendex's /send rich-content endpoint and /surveys/{id}/send + /surveys/{id}/report/standard pair handle delivery and reporting in one place, so an agent can run a survey campaign and pull standardised CSAT scores end-to-end.

Call POST /surveys/{id}/send with a contact list, then GET /surveys/{id}/report/standard to retrieve completion and score metrics.

AI Agent SMS Tool via Jentic

An AI customer-service agent can be wired through Jentic to read inbox messages and reply by SMS without a custom integration. The agent searches by intent (for example 'send an SMS'), loads the schema, and executes with HTTP Basic credentials scoped from the vault — useful for one-off support replies or scheduled reminders triggered from a conversation.

Use Jentic search('send an sms message'), load the POST /messagedispatcher operation, and execute it with the recipient and body.

Key Endpoints

17 endpoints — jentic publishes the only available openapi specification for the esendex api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/messagedispatcher

Send one or many SMS messages

POST

/messages/information

Estimate the cost of a message

GET

/messageheaders

List message headers

GET

/inbox/messages

Get inbound messages

GET

/conversation/{phonenumber}/messages

Get a conversation thread

POST

/send

Send rich-content message

POST

/surveys/{id}/send

Send a survey

POST

/accounts/{accountReference}/subscriptions

Create a webhook subscription

POST

/messagedispatcher

Send one or many SMS messages

POST

/messages/information

Estimate the cost of a message

GET

/messageheaders

List message headers

GET

/inbox/messages

Get inbound messages

GET

/conversation/{phonenumber}/messages

Get a conversation thread

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Your Esendex Basic credentials and Authorization API key are stored encrypted in the Jentic vault (MAXsystem). Agents call Esendex with a scoped reference; raw secrets are injected at execution time and never appear in the model context.

Intent-based discovery

Agents search by intent (for example 'send an sms' or 'send a survey') and Jentic returns the matching Esendex operation plus its parameter schema, so the agent picks the right endpoint without parsing both auth flavours.

Time to first call

Direct Esendex integration: 2-3 days to wire dual-auth, batch scheduling, webhook subscription, and survey reporting. Through Jentic: under 1 hour — search, load, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Esendex Messaging API

Smaller messaging-only Esendex spec — same vendor, narrower scope (6 endpoints)

Choose the Messaging API when an agent only needs the core send/read/inbox flow without surveys, rich content, or webhook subscriptions.

Complementary

Epidemic Sound Partner Content API

Music catalogue — pair with Esendex SMS to send creators links to licensed tracks

Use when an agent texts a creator a track URL after running an Epidemic Sound search.

Complementary

ePayTools Orchestra API

Payment orchestration — pair with Esendex SMS for payment receipts and 3DS step-up codes

Pick when an agent texts a payment confirmation or out-of-band SCA code after a charge.

FAQs

Specific to using Esendex API API through Jentic.

Why is there no official OpenAPI spec for the Esendex API?

Esendex publishes developer documentation at developers.esendex.com but not a downloadable OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call the Esendex API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Esendex API use?

The Esendex API supports two schemes: HTTP Basic for the legacy SMS endpoints and an apiKey Authorization header for newer rich-content and survey routes. Through Jentic both are stored encrypted in the MAXsystem vault and injected at execution time.

Can I send an SMS with the Esendex API?

Yes. POST /messagedispatcher accepts one or many message objects (recipient, body, account reference) and returns delivery batch metadata. Read GET /messageheaders/{id} to track per-message state.

What are the rate limits for the Esendex API?

Esendex applies per-account throughput controls based on your plan but does not encode them in the spec. Submit large sends as batches via /messagedispatcher rather than tight per-message loops, and respect 429 backoff.

How do I send a rich-content message through Jentic?

Search 'send rich content message'. Jentic returns the POST /send operation, you load its schema, and execute with the recipient and content payload. The Authorization API key is injected from the vault.

Can I read a conversation thread by phone number?

Yes. GET /conversation/{phonenumber}/messages returns the chronological message history for that number across both directions, useful for a unified inbox UI.

Does the API support webhook subscriptions for inbound messages?

Yes. POST /accounts/{accountReference}/subscriptions creates a webhook subscription scoped to an account, and DELETE /accounts/{accountReference}/subscriptions/{productId}/{eventId} removes one.