Only succeeds while the row is in PENDING / MLRO_REVIEW / CO_SIGNED. Once SUBMITTED on-chain the cancel is rejected — chain has irrevocable custody at that point. Returns the updated record with status=CANCELLED on success.
Partner / integrator key — format ps_live_<keyId>_<secret>. Issued by PredictStreet ops via the admin panel; never self-service. Never ship to a browser. multi_wallet partners must additionally send X-User-Wallet: 0x<40-hex> on every authenticated request to declare the acting wallet. See the API keys guide for scope taxonomy, partner kinds, rate limits, and rotation procedure.
Required for multi_wallet partners on every authenticated request; ignored for single_wallet. Declares the acting end-user wallet for this request — drives KYC checks, balances/positions/orders attribution, rate-limit buckets, and audit. Lower-cased server-side. Missing on a multi_wallet key → 401 api_key_user_wallet_required; malformed → 401 api_key_user_wallet_invalid. The on-chain CTFExchange/Vault contracts still verify EIP-712 signer ↔ vault binding, so loosening API-layer attribution is safe by construction.
^0x[a-fA-F0-9]{40}$"0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb3"
Withdrawal id (UUID).
OK
Server-side withdrawal id.
Authenticated wallet (lowercase 0x-hex).
USDC amount in human-readable decimal (NOT wei).
On-chain destination EOA.
Lifecycle: PENDING → (MLRO_REVIEW) → CO_SIGNED → SUBMITTED → CONFIRMED. Terminal failure paths: REJECTED (compliance/compliance denial), REVERTED (chain revert post-broadcast), CANCELLED (user-initiated), FAILED (settlement layer).
PENDING, MLRO_REVIEW, CO_SIGNED, SUBMITTED, CONFIRMED, REJECTED, REVERTED, CANCELLED, FAILED 0x-hex tx hash once SUBMITTED on-chain.
Reason text for REJECTED / FAILED / CANCELLED rows.