# day3 API

**Canonical:** https://apis.io/apis/day3-app/day3-app-api/  
**Provider:** day3 — https://apis.io/providers/day3-app/  
**Base URL:** https://go.day3.app  
**Documentation:** https://day3.app/features/api

day3 API is one of 2 APIs that [day3](https://apis.io/providers/day3-app/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 6 JSON Schema definitions. The published artifact set on APIs.io includes an OpenAPI specification and 6 JSON Schemas.

day3 API as documented publicly: 19 operations. Contract generated from the documentation by API Evangelist (2026-11-05); not the provider's own document.

## Operations (19)

| Method | Path | Summary |
|---|---|---|
| GET | `/api/v1/audiences` | List audiences, returns a data array |
| POST | `/api/v1/audiences` | POST /api/v1/audiences |
| POST | `/api/v1/emails` | Send an email via the API |
| POST | `/api/v1/webhooks` | POST /api/v1/webhooks |
| GET | `/audiences/aud_123/contacts` | Conventions |
| POST | `/automations/{id}/enroll` | automations:enroll |
| POST | `/campaigns/{id}/schedule` | Unlocks campaigns:send |
| POST | `/campaigns/{id}/send` | Unlocks campaigns:send |
| POST | `/emails` | Conventions |
| GET | `/emails/{id}` | Poll GET /emails/{id} to watch it reach delivered |
| POST | `/v1/automations/{id}/enroll` | POST /v1/automations/{id}/enroll puts one address into a published automation, creating the contact if it's new. |
| POST | `/v1/emails` | POST /v1/emails takes from, to (up to 50 recipients), subject, and html or text, and returns an id you can poll for delivery status. |
| GET | `/v1/webhooks` | List endpoints |
| POST | `/v1/webhooks` | Create an endpoint |
| DELETE | `/v1/webhooks/{webhookId}` | Delete an endpoint |
| GET | `/v1/webhooks/{webhookId}` | Retrieve an endpoint |
| PATCH | `/v1/webhooks/{webhookId}` | Update an endpoint |
| GET | `/v1/webhooks/{webhookId}/deliveries` | Delivery log |
| POST | `/your/endpoint` | POST /your/endpoint receives webhook events from Day3. |

## Machine-readable artifacts (7)

- **OpenAPI** — https://artifacts.apis.io/day3-app/openapi/_ae-authored/day3-app-openapi-generated.yml
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-get-emails-id-response-schema.json
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-post-api-v1-emails-response-schema.json
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-get-v1-webhooks-webhookid-deliveries-response-schema.json
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-post-your-endpoint-request-schema.json
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-get-v1-webhooks-response-schema.json
- **JSONSchema** — https://artifacts.apis.io/day3-app/json-schema/day3-app-get-v1-webhooks-webhookid-response-schema.json

## Other day3 APIs (1)

- [Day3 API](https://apis.io/apis/day3-app/day3-api/)

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/day3-app/day3-app-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/day3-app/.