---
title: "Discover available streams"
method: POST
path: "/source_discover"
tags: ["Stateless Sync API"]
---

# Discover available streams

`POST /source_discover`

Streams NDJSON messages (catalog, logs, traces) for the configured source.

## Response `200`

NDJSON stream of discover messages

## Other responses

- `400` — Invalid params

## Changes

- **2026-04-20** `98cef0c30f36` — 1 breaking
  - the `header` request parameter `x-source` became required
- **2026-04-20** `1e719ad9a31f` — 1 breaking
  - removed the request body
- **2026-04-20** `8bea86f53f8e` — 1 info
  - added the optional property `oneOf[#/components/schemas/LogMessage]/log/data` to the response with the `200` status
- **2026-04-19** `39acb204a056` — 4 info
  - removed `trace` mapping keys from the response discriminator for the response status `200`
  - removed `#/components/schemas/TraceMessage` from the response body `oneOf` list for the response status `200`
  - added the optional property `oneOf[#/components/schemas/CatalogMessage]/catalog/streams/items/newer_than_field` to the response with the `200` status
  - added the optional property `oneOf[#/components/schemas/CatalogMessage]/catalog/streams/items/soft_delete_field` to the response with the `200` status
- …earlier changes not shown

[Full history](https://skmtc.dev/stripe/apis/stripe-sync-engine/changes/source_discover/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/c19b0d0a0631/schema)