---
title: "Check connector connection"
method: POST
path: "/pipeline_check"
tags: ["Stateless Sync API"]
---

# Check connector connection

`POST /pipeline_check`

Validates the source/destination config and tests connectivity. Streams NDJSON messages (connection_status, log, trace) tagged with _emitted_by.

## Response `200`

NDJSON stream of check messages

## Other responses

- `400` — Invalid params

## Changes

- **2026-04-15** `4e5abb8c5e22` — 2 breaking
  - removed the request body
  - the `header` request parameter `x-pipeline` became required
- **2026-04-15** `2e101196e4f5` — 2 info
  - added optional request body
  - the `header` request parameter `x-pipeline` became optional
- **2026-04-14** `4e5abb8c5e22` — 4 warning, 1 info
  - added the new `auth_error` enum value to the `oneOf[#/components/schemas/TraceMessage]/trace/oneOf[subschema #2]/stream_status/status` response property for the response status `200`
  - added the new `config_error` enum value to the `oneOf[#/components/schemas/TraceMessage]/trace/oneOf[subschema #2]/stream_status/status` response property for the response status `200`
  - added the new `system_error` enum value to the `oneOf[#/components/schemas/TraceMessage]/trace/oneOf[subschema #2]/stream_status/status` response property for the response status `200`
  - added the new `transient_error` enum value to the `oneOf[#/components/schemas/TraceMessage]/trace/oneOf[subschema #2]/stream_status/status` response property for the response status `200`
  - …1 more
- **2026-04-14** `94093fe7df85` — 1 breaking, 1 info
  - added `subschema #2, subschema #4` to the `oneOf[#/components/schemas/TraceMessage]/trace` response property `oneOf` list for the response status `200`
  - removed `subschema #2` from the `oneOf[#/components/schemas/TraceMessage]/trace` response property `oneOf` list for the response status `200`
- …earlier changes not shown

[Full history](https://skmtc.dev/stripe/apis/stripe-sync-engine/changes/pipeline_check/post.md)

---

[API](https://skmtc.dev/stripe/apis/stripe-sync-engine.md) · [All operations](https://skmtc.dev/stripe/apis/stripe-sync-engine/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/stripe/stripe-sync-engine/revisions/4e5abb8c5e22/schema)