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Custom Connector to MotherDuck integration

Connect Custom Connector to MotherDuck and automatically sync your application data. Weld extracts data from Custom Connector, loads it into MotherDuck, and lets you transform the data using SQL or dbt, no custom scripts required.

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4.8 on G2
Custom ConnectorSource
WeldWeld
MotherDuckWarehouse
Weld · New sync
Custom ConnectorSourceCustom ConnectorConnected
Tables to sync

Your own tables, picked when you set up the sync.

  • Extract
  • Load
  • Keep in sync
MotherDuckDestinationMotherDuckReady
custom_integration schema
  • custom_integration.Synced
  • custom_integration.Syncing
  • custom_integration.Synced
  • custom_integration.Synced

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How it works

How to set up Custom Connector to MotherDuck in Weld.
In the app, with the API or an agent.

API guideMCP docs
Weld · New Custom Connector sync
Custom ConnectorNew connectionCustom ConnectorAuthorised
Connection namecustom_integration
AuthorizeOpens Custom Connector to grant read access
Use cases

Why sync Custom Connector to MotherDuck?
Ready for analysis.

Centralizing your Custom Connector data in MotherDuck lets you join it with other data sources for cross-platform analytics and deeper insights.

Build reliable dashboards and reports by querying Custom Connector data directly in MotherDuck using SQL or your preferred BI tool.

  • Centralized data warehouse

    Bring Custom Connector data into MotherDuck alongside other sources to create a single source of truth for your organization.

  • Automated reporting

    Replace manual exports and spreadsheet-based reporting with automated pipelines from Custom Connector to MotherDuck. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you sync?
From Custom Connector to MotherDuck.

Weld syncs the objects the Custom Connector connector exposes into MotherDuck, and you choose which tables and fields to include. The connector's docs list what is available.

    Weld MCP server

    Ask your agent.
    It queries MotherDuck for you.

    Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It reads the Custom Connector context, finds the tables it needs and runs the query in MotherDuck.

    Set up the MCP serverClaudeCursorChatGPTGemini
    Claude CodeOpus 5
    >

    Which Custom Connector tables do we have in MotherDuck, and which is the largest?

    Looking up what Weld has synced from Custom Connector.

    ●weld·search_available_references
    ⎿raw.custom_integration.*
    tables, columns and freshness
    ●weld·get_reference_schema
    ⎿columns, types and nullability
    ●weld·run_query
    ⎿select count(*) from {{raw.custom_integration.…}}
    submitted
    ●weld·get_query_status
    ⎿DONE
    ●weld·get_query_result
    ⎿rows returned
    ✓Answered from Custom Connector data in MotherDuck
    >Ask about your Custom Connector data
    Under the hood

    Technical considerations.
    What to expect.

    Incremental syncing
    Weld uses incremental syncing where supported by the Custom Connector API, loading only new and updated records to minimize data transfer and warehouse costs.
    Schema handling
    Weld automatically manages schema changes. If Custom Connector adds new fields, they're detected and added to the corresponding MotherDuck tables.
    Data freshness
    Sync frequency depends on your Weld plan. Most connectors support schedules from every 5 minutes up to daily intervals.
    Security
    All data is encrypted in transit (TLS) and at rest. Weld is SOC 2 Type II compliant and supports IP whitelisting for database connections.
    Resources

    Keep reading.
    Guides, docs and schema.

    Documentation

    MotherDuck setup guide

    How to connect MotherDuck to Weld, step by step.

    Connector

    Custom Connector connector

    Everything Weld does with Custom Connector.

    Connector

    MotherDuck connector

    Everything Weld does with MotherDuck.

    FAQ

    Common questions.
    About Custom Connector to MotherDuck.

    Start syncing Custom Connector to MotherDuck.

    Set up your Custom Connector data pipeline in minutes. No credit card required. Free for 14 days.

    Custom ConnectorSource
    WeldWeld
    MotherDuckWarehouse
    Start for freeTalk to us
    Related

    Related integrations.
    More with Custom Connector and MotherDuck.

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