CSV via S3 Connector

Our CSV connnector lets you automatically load CSV files in multiple formats in your Destination.

Start for free View documentation

4.8 on G2

Weld · Data Sources

CSV via S3Your 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.

CSV via S3

Data source

Authenticating...

Ready to connect

Overview

CSV via S3 in your warehouse.
Ready for your agents.

Our CSV connnector lets you automatically load CSV files in multiple formats in your Destination. Weld's CSV via S3 connector is fully managed: it extracts data from CSV via S3, 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 CSV via S3.

Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It finds the CSV via S3 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 CSV via S3 tables do we have, and which one is the largest?

Looking up what the CSV via S3 connection has synced.

●weld·search_available_references

⎿raw.aws_s3__csv.*

tables, columns and freshness

●weld·get_reference_schema

⎿columns, types and nullability

●weld·run_query

⎿select count(*) from {{raw.aws_s3__csv.…}}

submitted

●weld·get_query_status

⎿DONE

●weld·get_query_result

⎿rows returned

✓Answered from CSV via S3 data in your warehouse

>Ask about your CSV via S3 dataMCP

Destinations

Load CSV via S3 into any warehouse.
Set up in minutes, no code.

Resources

Everything you need.
To get started.

Documentation

CSV via S3 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 CSV via S3 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 CSV via S3 ELT sync
curl -X POST https://connect.weld.app/elt_syncs \
  -H "x-api-key: $API_KEY" \
  -d '{
    "connection_id": "conn_abc123",
    "integration_id": "aws-s3__csv",
    "destination_schema_name": "aws-s3__csv_data",
    "sync_interval": "0 * * * *"
  }'
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