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Polymarket errors / Trades
400 Bad RequestDon't retry

Invalid trade params payload

The query parameters are malformed or contain invalid values.

Retry? Don't retry

Sending the same request again returns the same error. Change the request first.

Returned by

  • GET trades

Handling it in code

The CLOB API returns errors as {"error": "..."}. It also rewrites status codes by message, so branch on the text: anything containing "not found" becomes 404 and anything containing "unauthorized" becomes 401.

r = session.post(url, json=payload, headers=headers)
if r.status_code >= 400:
    msg = r.json().get("error", "")
    if "Invalid trade params payload" in msg:
        raise ValueError(msg)  # fix the request, don't retry

For errors Polymarket doesn't document, like "order manager not ready" or 403s from the edge, see the full error guide.

Message and status from Polymarket's error reference, synced 2026-10-04.