Cancel all pending limit orders (canonical verb).
Polymarket’s CLOB and our public docs use POST for this action; DELETE is preserved as a back-compat alias for SDKs that adopted the prior shape, but POST is canonical going forward. Requires confirmation: pass ?confirm=true query parameter OR X-Confirm-Cancel-All: true header to prevent accidental order wipeouts.
Authorizations
Issue from /v1/keys (or admin-issued for enterprise tier).
Headers
Alternative to ?confirm=true; set to true.
Your PolySimulator API key
Polymarket-CLOB-compat alias for X-API-Key (underscore form). SDK clients ported from Polymarket can authenticate without changing header names. X-API-Key takes precedence when both are provided.
PM-CLOB-compat: Authorization: Bearer ps_live_... (or ps_test_...) is accepted as an alias for X-API-Key so py-clob-client and other ported SDKs authenticate without header name changes. Bearer JWTs are NOT accepted here — use the dashboard-auth endpoints for those.
Query Parameters
Required (one of confirm=true / X-Confirm-Cancel-All header). Footgun guard — see endpoint description.