# sendly-now Compatibility API

**Canonical:** https://apis.io/apis/sendly-now/sendly-now-compatibility-api/  
**Provider:** sendly-now — https://apis.io/providers/sendly-now/  
**Base URL:** https://api.sendly.now  
**Documentation:** https://docs.sendly.now/api-reference/overview

sendly-now Compatibility API is one of 27 APIs that [sendly-now](https://apis.io/providers/sendly-now/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 6 JSON Schema definitions. Tagged areas include Compatibility. The published artifact set on APIs.io includes an OpenAPI specification and 6 JSON Schemas.

Drop-in endpoints for the Resend, SendGrid, Postmark, Mailgun and Plunk send APIs, so an existing integration can switch by changing its base URL and key. They are NOT the native API: each speaks its vendor's request body, auth header and error shape (not RFC 9457), covers only the send path, and refuses vendor features Sendly has no equivalent for. New code should use the native `Emails` operations.

## Operations (8)

| Method | Path | Summary |
|---|---|---|
| POST | `/api/compat/mailgun/v3/{domain}/messages` | Send a message (Mailgun dialect) |
| POST | `/api/compat/plunk/v1/send` | Send an email (Plunk dialect) |
| POST | `/api/compat/postmark/email` | Send an email (Postmark dialect) |
| POST | `/api/compat/postmark/email/batch` | Send a batch of emails (Postmark dialect) |
| POST | `/api/compat/resend/emails` | Send an email (Resend dialect) |
| POST | `/api/compat/resend/emails/batch` | Send a batch of emails (Resend dialect) |
| GET | `/api/compat/resend/emails/{id}` | Retrieve an email (Resend dialect) |
| POST | `/api/compat/sendgrid/v3/mail/send` | Send mail (SendGrid v3 dialect) |

## Machine-readable artifacts (7)

- **OpenAPI** — https://artifacts.apis.io/sendly-now/openapi/sendly-now-compatibility-api-openapi.yml
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-compose-mailbox-message-schema.json
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-mailbox-conversation-reply-body-schema.json
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-domain-logo-readiness-v1-schema.json
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-send-email-schema.json
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-send-email-v1-schema.json
- **JSONSchema** — https://artifacts.apis.io/sendly-now/json-schema/sendly-now-domain-schema.json

## Other sendly-now APIs (12)

- [sendly-now Account API](https://apis.io/apis/sendly-now/sendly-now-account-api/)
- [sendly-now Analytics API](https://apis.io/apis/sendly-now/sendly-now-analytics-api/)
- [sendly-now API Keys API](https://apis.io/apis/sendly-now/sendly-now-api-keys-api/)
- [sendly-now Billing API](https://apis.io/apis/sendly-now/sendly-now-billing-api/)
- [sendly-now Campaigns API](https://apis.io/apis/sendly-now/sendly-now-campaigns-api/)
- [sendly-now Connections API](https://apis.io/apis/sendly-now/sendly-now-connections-api/)
- [sendly-now Contacts API](https://apis.io/apis/sendly-now/sendly-now-contacts-api/)
- [sendly-now Deliverability API](https://apis.io/apis/sendly-now/sendly-now-deliverability-api/)
- [sendly-now Domains API](https://apis.io/apis/sendly-now/sendly-now-domains-api/)
- [sendly-now Emails API](https://apis.io/apis/sendly-now/sendly-now-emails-api/)
- [sendly-now Events API](https://apis.io/apis/sendly-now/sendly-now-events-api/)
- [sendly-now Lists API](https://apis.io/apis/sendly-now/sendly-now-lists-api/)

## Tags

Compatibility

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