503 Service Unavailable Error

LangSmith Product Help Observability & Evals
1

Hello,

I’m making the following POST request to the LangSmith API and consistently receiving a 503 error.

Endpoint:

bash

CopyEdit

POST https://api.smith.langchain.com/api/v1/runs/query

Headers:

makefile

CopyEdit

x-api-key: (my API key)
Content-Type: application/json

JSON Body:

json

CopyEdit

{
  "project_id": "(my project ID)",
  "session": ["(same project ID)"],
  "run_type": "chain",
  "filter": "gt(cursor, '2025-06-11 16:24:35.433000...')",
  "limit": 100,
  "order": "asc"
}

This same request structure was working previously just yesterday. Is this related to rate limits?

2

Hey @bae,

Flagging internally - is it working now?

Jacob

3

Have been told that there was briefly an issue with this but it should be fixed now.