Weld Connect API

Fast and Seamless Integration

A developer-friendly API for connecting, automating, and managing data across all your business tools.

Why Choose Weld Connect?

• Rapid Integration: Clear API documentation and easy setup. Start building in minutes, not hours.

• Scalable Automation: Automate data flows across CRMs, finance tools, ad platforms, and more.

• Reliable Support: Responsive support from a team that knows the product inside out.

Available Endpoints

The API covers these core areas:

Connections & ELT Syncs

Create data sources, configure syncs, select streams, and control scheduling.

• Connection creation →
• Creating an ELT sync →
• Pagination →

Transforms API New

Create, update, publish, and version data models directly through the API.

Endpoint	What it does
GET /transforms	List models with filters
POST /transforms	Create a model with SQL and optional auto-publish
PATCH /transforms/{id}	Update SQL, name, folder, or materialization
POST /transforms/{id}/publish	Materialize to your warehouse
GET /transforms/{id}/versions	Browse revision history
POST /transforms/bulk	Create up to 50 models at once

Read the Transforms API blog post →

Usage

Read your account's synced rows and active rows, the same numbers as the Usage page in the Weld app.

Endpoint	What it does
GET /usage	Totals for a usage period, split into ELT and Reverse ETL, with your plan's active rows limit and rows per integration
GET /usage/elt_streams	Usage per table of each ELT sync, most active rows first
GET /usage/reverse_etl_objects	Usage per destination object of each Reverse ETL sync, most active rows first

All three cover the current usage period by default. Set start_date and end_date (exclusive) together to look at another period starting within the last 6 months.

Full API Reference

All endpoints, request/response formats, and authentication details are available in the API reference →.

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Use Cases

• Integration orchestration: Automate connections between business systems, syncing data across platforms without manual data entry.

• CI/CD model deployments: Push SQL models from Git to Weld as part of your release pipeline using the Transforms API.

• AI agent workflows: Let coding assistants (Claude Code, Cursor, Copilot) or custom agents create connections, trigger syncs, and publish models via the API.

• Workflow automation: Trigger and control data processes through APIs, enabling dynamic scheduling and multi-step orchestrations.

• Access and permissions control: Manage user roles, permissions, and API keys programmatically.

• Data monitoring: Capture real-time metrics on data syncs, system health, and performance.

  Limitations

  Currently, it is not possible to create ELT syncs using Weld Connect for the following integrations:

  • Business Central
  • Microsoft OneDrive
  • SFTP

  We also don't support the creation of any custom reports such as the ones we have under Facebook Ads, Google Ads and Google analytics.