{"enabled": false, "configured": true, "reason": "local_signer_or_receiver_unavailable", "protocol_version": 2, "scheme": "exact", "network": "eip155:8453", "asset": "USDC", "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "decimals": 6, "create_endpoint": "POST /v1/account/topups/x402", "min_credit_usd": "1.00", "max_credit_usd": "2000.00", "processing_fee_usd": "0.00", "authentication": "Bearer API key", "required_body_fields": ["credit_usd", "idempotency_key"], "payment_header": "PAYMENT-SIGNATURE", "challenge_header": "PAYMENT-REQUIRED", "receipt_header": "PAYMENT-RESPONSE", "credit_after": "Canonical finalized USDC Transfer and AuthorizationUsed events plus exact-once credit ledger.", "quote_valid_seconds": 600, "signed_authorization_max_seconds": 300, "unknown_outcome": "GET invoice status only; no new signature or settlement replay.", "manual_transfer_supported": false, "facilitator": "self-hosted", "private_keys_on_server": false, "signer": "Owner computer, separate gas wallet; must be online and funded.", "confirmation_policy": "Base finalized block; may take minutes, not instant credit."}