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CRM ⇄ Business productivity

Attio to Resend integration — real-time, two-way sync

Keep Attio and Resend in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

  • SOC 2 and 6 other compliance frameworks
  • POC with real engineers in minutes

Adopted by fast-scaling companies moving mission-critical data in real time

Case study
Migrated from Mulesoft
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Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
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Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Attio and Resend

Sync what happens in Resend with the customer records in Attio, in real time and in both directions.

The CRM is supposed to be the record of every customer relationship, but customer-relevant information also accumulates in the other tools a team runs. Whatever Resend holds or produces that touches a customer, whether conversations, payments, replies, enriched data, or notes, the CRM only benefits if it arrives without someone copying it over.

Stacksync connects API keys, Emails, Contacts, Audiences in Resend to Workspaces, Custom objects, People, Companies in Attio with bi-directional, real-time sync. Activity and record changes in Resend update the matching contact or account in Attio, and CRM data flows the other way wherever Resend can store and use it.

Common use cases

  • Keep suppression and unsubscribe state synced between Resend and other marketing tools to stay compliant.
  • Feed open and click events into a warehouse for engagement analytics alongside product data.
  • Run a two-way dual-run when migrating to Attio from another CRM.
  • Sync companies, people, and deals with Postgres so ops teams enrich and update CRM records with SQL.

Where Resend can store CRM context: fields kept current

Owner, lifecycle stage, or account details from Attio sync into Resend, so people working there have the context without switching tools.

Where Resend handles support or shared inboxes

Tickets and conversations attach to the right contact and account in Attio, so sales sees open issues before the next call.

Where Resend runs outreach

Prospects, sends, and replies sync into Attio, keeping lead status current without manual imports.

What you can sync between Attio and Resend

Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.

Attio objects Resend objects
Custom objects Workspace-defined objects that behave like standard ones in the API. Broadcasts One-to-many campaign sends addressed to an audience.
People Standard person object; synced with marketing tools and warehouse person tables. Domains Verified sending domains with DNS and DKIM status.
Companies Standard company object; matched to billing and product accounts in two-way syncs. Email events Delivered, bounced, complained, opened, and clicked events emitted via webhooks and written back to source systems.
Users Synced with incremental and full sync per the Stacksync docs. API keys Scoped credentials managed per environment for send and read access.
Deals Pipeline records; read out for revenue reporting and written to from automation. Emails Sent messages retrievable by ID with current delivery status.
Workspaces Synced with incremental and full sync per the Stacksync docs. Contacts Recipient records with email, name, and subscription state, synced from CRMs or databases.
What ships with Attio ⇄ Resend

Connect Attio and Resend for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Attio–Resend connection.

Real-time

Two-way sync

Changes in Attio or Resend instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Attio or Resend data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.

At scale

Event queues

Handle millions of events per minute without losing a single Attio or Resend record.

Observability

Monitoring

Track your Attio ⇄ Resend sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Attio and Resend.

How the Attio and Resend connectors work

Attio

Integration surface
REST API
Authentication
Guided in-app connection ("Attio CRM" connection created in a few clicks, "without any coding required"); the docs do not name the underlying auth mechanism (OAuth vs API key)
Change detection
Webhooks on record and list-entry events, with polling as a fallback
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's published API rate limits.
Attio setup guide

Resend

Integration surface
REST API
Authentication
API key (Bearer token)
Change detection
Webhooks for email lifecycle events; polling for contact and audience state
Capabilities
read · write · webhooks
How it works

How to connect Attio to Resend — three steps, no code

Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.

  1. 01

    Connect your apps

    Authenticate Attio and Resend with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    Attio connected
    Resend connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Attio and Resend objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · Attio ⇄ Resend
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    Attio Resend
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Attio and Resend integration FAQ

SECURITY

Security teams love Stacksync

As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.

Learn more about security
SOC 2 type II
ISO 27001
HIPAA BAA
GDPR
CCPA
CSA STAR
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS

SSO & SCIM

Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.

Alerts

Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.

Secure connection options

Securely connects to your systems with:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 386 integrations available for Attio and Resend.

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