0n3
MCP servers · Resend · connector

Connect Claude (desktop & claude.ai) to Resend

One line gives Claude (desktop & claude.ai) your Resend account as tools: 67 endpoints, send email, batch emails, domains, called with your own connection. No key in the prompt, a receipt for every call, revoke Claude (desktop & claude.ai)'s access alone any time.

Get the line for Claude (desktop & claude.ai)Connect Resend first

Three steps

  1. Create a free 0n3 account and connect Resend. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into Claude (desktop & claude.ai). Add 0n3 as a custom connector; sign in once through the 0n door.
  3. Ask Claude (desktop & claude.ai): whoami. Then: "Send an email in Resend".
Claude desktop app and claude.ai
  1. Settings → Connectors → Add custom connector
  2. Name: 0n3 · URL: https://0n3.app/mcp
  3. Click Connect and sign in with your 0n account (email + password, or paste your 0n token)
  4. Turn the connector on in a chat and ask: "whoami"

This is the OAuth door: no token to paste, revoke it any time from 0n3 → Tokens.

The line above carries a placeholder; 0n3.app/install mints a real key named for Claude (desktop & claude.ai) and fills it in.

What Claude (desktop & claude.ai) can then do in Resend

Send email · Send transactional emails with HTML, React templates, scheduling, and attachments11
Send an emailPOST /emails
List emailsGET /emails
Get an emailGET /emails/{email_id}
Update an emailPATCH /emails/{email_id}
Cancel an emailPOST /emails/{email_id}/cancel
List received emailsGET /emails/receiving
Get a received emailGET /emails/receiving/{email_id}
List email attachmentsGET /emails/{email_id}/attachments
Get an email attachmentGET /emails/{email_id}/attachments/{attachment_id}
List received attachmentsGET /emails/receiving/{email_id}/attachments
Get a received attachmentGET /emails/receiving/{email_id}/attachments/{attachment_id}
Batch emails · Send up to 100 emails in a single batch request1
Send batch emailsPOST /emails/batch
Domains · Create, list, verify, update, and delete email domains6
Create a domainPOST /domains
List domainsGET /domains
Get a domainGET /domains/{domain_id}
Update a domainPATCH /domains/{domain_id}
Verify a domainPOST /domains/{domain_id}/verify
Delete a domainDELETE /domains/{domain_id}
Api keys · Create, list, and delete API keys3
Create an api keyPOST /api-keys
List api keysGET /api-keys
Delete an api keyDELETE /api-keys/{api_key_id}
Audiences · Create, list, get, and delete audiences (deprecated — use segments)4
Create an audiencePOST /audiences
List audiencesGET /audiences
Get an audienceGET /audiences/{audience_id}
Delete an audienceDELETE /audiences/{audience_id}
Contacts · Create, list, get, update, and delete contacts5
Create a contactPOST /contacts
List contactsGET /contacts
Get a contactGET /contacts/{contact_id}
Update a contactPATCH /contacts/{contact_id}
Delete a contactDELETE /contacts/{contact_id}

All 67 Resend endpoints →

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