How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

WhatsApp Messages API

Send messages of all types to WhatsApp users

WhatsApp Messages API is one of 17 APIs that WhatsApp publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

This API exposes 2 JSON Schema definitions.

Tagged areas include Message. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, authentication docs, an AsyncAPI specification, an API reference, a getting-started guide, and 2 JSON Schemas.

This API exposes 1 operation across 1 path, and defines 16 schemas. It is described by OpenAPI 3.2.0, at version 21.0.

Requests are made against a single base URL, https://graph.facebook.com/v21.0.

1 operations 1 paths 16 schemas 1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
21.0
Base URL
https://graph.facebook.com/v21.0
Authentication
HTTP Bearer
Terms of Service
Resource Areas
1

Authentication & Security 1

WhatsApp Messages API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

  • bearerAuth — System User Token with whatsappbusinessmanagement permission

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.

Messages 1

Send messages of all types to WhatsApp users

POST
/{phone-number-id}/messages
WhatsApp Send a Message
sendMessage 1 param body → 200400401

Schemas 16

The contract defines 16 schemas that model the data the API accepts and returns. The most detailed are SendMessageRequest (19 properties), TemplateParameter (10 properties), ContactObject (7 properties), InteractiveMessage (5 properties). Each schema is shown below with its type and property counts.

SendMessageResponse
object
3 properties
AudioObject
object
2 properties
SendMessageRequest
object
19 properties 3 required
StickerObject
object
2 properties
ListSection
object
2 properties
ErrorResponse
object
1 property
MediaObject
object
3 properties
LocationMessage
object
4 properties 2 required
TemplateMessage
object
3 properties 2 required
InteractiveMessage
object
5 properties 2 required
TemplateParameter
object
10 properties 1 required
ContactObject
object
7 properties 1 required
DocumentObject
object
4 properties
TemplateComponent
object
4 properties 1 required
ReactionMessage
object
2 properties 2 required
TextMessage
object
2 properties 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

whatsapp-messages-api-openapi.yml Raw ↑

Other APIs WhatsApp publishes across the network.

WhatsApp Flows API
WhatsApp On-Premises API
WhatsApp Analytics API
WhatsApp Assets API
WhatsApp Assigned Users API
WhatsApp Business Accounts API
WhatsApp Business Profile API
WhatsApp Lifecycle API
WhatsApp Media API
WhatsApp Message Templates API
WhatsApp Phone Numbers API
WhatsApp Product Catalogs API
Where this information came from

This is an independent, third-party profile of WhatsApp Messages 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.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.