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Resend connects with an API key from your Resend dashboard. It is a developer email API - one call to send, one to read what happened.

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What you can do

Actions - send an email, send a batch, read a sent email, list domains, add a contact, list contacts, draft a broadcast, send a broadcast. Triggers - none. Use it through the assistant in chat or as an action node in an automation.

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Get your credential

1

Open your Resend dashboard

Sign in at resend.com/api-keys.
2

Create a key

Create a key and copy it. Keys start with re_. Choose Full access for the contact, domain, and broadcast actions - a sending-only key connects fine but can only send.

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Connect

1

Open Integrations

In arg.ai, go to Settings → Integrations and click Connect on Resend.
2

Paste the key

Enter your API key in the API key field.
3

Save

arg.ai checks the key against Resend without sending an email.

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Use it

  • In chat: “Did the receipt I sent this morning actually get delivered?”
  • In an automation: add a Resend action node to email each new form submission a confirmation.

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Sending, one or many

  • Send an email takes a from address on a verified domain, up to 50 recipients, and html, text, or both. scheduled_at accepts an ISO 8601 timestamp or natural language such as in 1 hour.
  • Send a batch sends up to 100 individually addressed messages in one call - one personalized message per recipient, rather than one message with many recipients.
  • List domains shows which domains are verified, so you can pick a from that will actually send.
Both send actions return an email id. Read a sent email turns that id back into the delivery outcome - its last_event is delivered, bounced, opened, complained, and so on.

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Contacts and broadcasts

Resend’s audiences are now segments. A broadcast is drafted against a segment_id, and nothing goes out until you send it - Draft a broadcast returns a broadcast id and Send a broadcast delivers it, immediately or at a scheduled time. Only broadcasts created through the API can be sent this way.