# Weld

> Weld is a programmable data-infrastructure platform for near real-time ELT/ETL, log-based Change Data Capture, SQL data transformations, and Reverse ETL, with 300+ prebuilt connectors. The Weld Connect REST API and a hosted MCP server let developers and AI agents create connections, run and monitor syncs, build transforms, and orchestrate pipelines. Copenhagen-based, backed by a16z. (Generated by the API Evangelist enrichment pipeline from the Weld developer surface — not an official Weld llms.txt.)

## APIs
- [Weld Connect API reference](https://weld.app/docs/api-reference): REST API to control connections, ELT syncs/streams, transforms, orchestrations, and Reverse ETL. Base URL https://connect.weld.app. Auth: API key in x-api-key header.
- [OpenAPI 3.0 spec](openapi/weld-connect-openapi.json): 65 operations across 52 paths.

## Docs
- [Documentation](https://weld.app/docs)
- [Getting started](https://weld.app/docs/weld-connect/getting-started)
- [Pagination](https://weld.app/docs/weld-connect/pagination): cursor-based via starting_after + limit
- [MCP Server](https://weld.app/docs/weld-connect/mcp-server): https://connect.weld.app/mcp (Streamable HTTP; OAuth or x-api-key)
- [Authentication Links](https://weld.app/docs/using-weld/authentication-links)
- [Custom Connector](https://weld.app/docs/custom-connector)
- [Security](https://weld.app/security): SOC 2 Type II, ISO 27001, GDPR

## Artifacts
- [Authentication profile](authentication/weld-authentication.yml)
- [API conventions](conventions/weld-conventions.yml)
- [Error catalog](errors/weld-problem-types.yml)
- [Lifecycle](lifecycle/weld-lifecycle.yml)
- [Data model](data-model/weld-data-model.yml)
- [MCP server](mcp/weld-mcp.yml)
- [Agentic access](agentic-access/weld-agentic-access.yml)
- [Conformance](conformance/weld-conformance.yml)

## Operations
- [Pricing](https://weld.app/pricing)
- [Status](https://status.weld.app/)
- [Service Level Agreement](https://weld.app/service-level-agreement)
- [Support](https://weld.app/support)
- [Blog](https://weld.app/blog)