Custom Connector Connector

Weld Custom Connector allows you to build your own connectors and sync data from any source.

Start for free View documentation

4.8 on G2

Weld · Data Sources

Custom ConnectorYour warehouseLive

Pick the tables to sync, and they appear here with their status.

Lands in

Queryable over MCP

How it works

Set up in minutes.
No code, no maintenance.

Custom Connector

Data source

Authenticating...

Ready to connect

Overview

Custom Connector in your warehouse.
Ready for your agents.

Weld Custom Connector allows you to build your own connectors and sync data from any source. Weld's Custom Connector connector is fully managed: it extracts data from Custom Connector, loads it into your warehouse, and keeps it in sync. The data lands in a clean, documented schema with agent context attached, so analysts can query it with SQL or dbt, and agents can query it over the Weld MCP server without guessing at tables or joins.

Weld MCP server

Ask your agent.
It can reach Custom Connector.

Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It finds the Custom Connector tables Weld has synced and queries your warehouse.

DiscoverSynced tables, columns and freshness
QuerySQL against your warehouse
OperateCheck, rerun and refresh syncs

Set up the MCP server

Claude CodeOpus 5

ConnectedWeld MCP

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

Looking up what the Custom Connector connection has synced.

●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 your warehouse

>Ask about your Custom Connector dataMCP

Destinations

Load Custom Connector into any warehouse.
Set up in minutes, no code.

Resources

Everything you need.
To get started.

Documentation

Custom Connector setup guide

Step-by-step instructions to configure and start syncing.

MCP server

Connect your agents

Set up Claude, Cursor, ChatGPT or Codex against your Weld workspace.

Weld Connect API

Build custom connectors

Use the Weld Connect API to build and publish your own connector.

FAQ

Common questions

Answers to frequently asked questions about Weld connectors.

Weld Connect API

Set it up in code.
One REST API.

Use the Weld Connect REST API to create Custom Connector connections, configure ELT syncs, and manage pipelines entirely through code. Built for embedding, automation, and CI/CD workflows.

Explore Weld Connect API reference

POST/elt_syncs

# Create a Custom Connector ELT sync
curl -X POST https://connect.weld.app/elt_syncs \
  -H "x-api-key: $API_KEY" \
  -d '{
    "connection_id": "conn_abc123",
    "integration_id": "custom-integration",
    "destination_schema_name": "custom-integration_data",
    "sync_interval": "0 * * * *"
  }'
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