# Weld

**Canonical:** https://apis.io/providers/weld/  
**Website:** https://weld.app  
**APIs profiled:** 13

Weld is a programmable data-infrastructure platform for moving and transforming data. It runs near real-time ELT/ETL pipelines from 300+ prebuilt connectors, log-based Change Data Capture (CDC), SQL-based data transformations with lineage and version history, and Reverse ETL to activate modeled data back into operational tools. The Weld Connect REST API and a hosted Model Context Protocol (MCP) server let developers and AI agents create connections, run and monitor ELT syncs, build and publish transforms, and orchestrate pipelines programmatically. Weld is a Copenhagen-based company backed by a16z and other leading investors.

## Kin Score — 50.4 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 50.4).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 56.9 |
| Governance | 11.5 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 62.5 |
| Commercial Clarity | 60.5 |

## Agent readiness — 49.8 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (13)

- **Weld Connection Bridge API** — The Connection Bridge API from Weld — 1 operation(s) for connection bridge.
- **Weld Connections API** — The Connections API from Weld — 3 operation(s) for connections.
- **Weld Custom Reports API** — The Custom Reports API from Weld — 1 operation(s) for custom reports.
- **Weld ELT Stream Runs API** — The ELT Stream Runs API from Weld — 2 operation(s) for elt stream runs.
- **Weld ELT Streams API** — The ELT Streams API from Weld — 5 operation(s) for elt streams.
- **Weld ELT Syncs API** — The ELT Syncs API from Weld — 8 operation(s) for elt syncs.
- **Weld Integrations API** — The Integrations API from Weld — 1 operation(s) for integrations.
- **Weld Orchestration Runs API** — The Orchestration Runs API from Weld — 2 operation(s) for orchestration runs.
- **Weld Orchestrations API** — The Orchestrations API from Weld — 3 operation(s) for orchestrations.
- **Weld Reverse ETL Failed Records API** — The Reverse ETL Failed Records API from Weld — 4 operation(s) for reverse etl failed records.
- **Weld Reverse ETL Sync Runs API** — The Reverse ETL Sync Runs API from Weld — 2 operation(s) for reverse etl sync runs.
- **Weld Reverse ETL Syncs API** — The Reverse ETL Syncs API from Weld — 9 operation(s) for reverse etl syncs.
- **Weld Transforms API** — The Transforms API from Weld — 11 operation(s) for transforms.

## MCP servers (1)

- **weld-mcp.yml**

## Agentic access (1)

- **Weld Agentic Access** — 65 operations · 33 acting · 33 human-in-the-loop

## Security (3)

- **Weld Authentication** — apiKey · 1 scheme
- **Weld Domain Security** — TLSv1.2 · HSTS · DMARC
- **Weld Trust Center** — SOC 2, ISO 27001, GDPR

## Tags

Company, Data, ETL, ELT, Reverse ETL, Data Pipelines, Data Integration, Change Data Capture, Transformations, Analytics, MCP, AI Agents

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/weld/). Scores are computed from the provider's own public artifacts under a published rubric.