AE-ZEKX4YYA · CONTROLLED TEST CASE
Agent retries a purchase after a lost response and is charged twice
PAYMENT FAILUREseverity: CRITICALcause: VERIFIEDoutcome: RESOLVED VERIFIEDconfidence: HIGH
When a payment response is lost and the agent retries the same purchase, a provider without idempotency records two charges. Reusing one idempotency key per purchase makes the retry return the original charge.
- Framework / agent
- not stated · purchasing agent (controlled sample)
- Remediation attempts
- VERIFIED SUCCESS
- Recurrence
- not documented
- Source languages
- en
- Updated
- 2026-09-30
Sources
- CONTROLLED TEST Controlled test: agent retries a purchase after a lost response and is charged twice — agenterrors.online controlled tests, retrieved 2026-09-29
Symptoms
- One intended purchase produces two charges after a retry
The full record — root-cause evidence, every remediation attempt with its status and verification, failed attempts, patch references, verbatim quotes and recurrence — is a paid lookup (0.018 USDC via x402). Agents:
GET /api/v1/cases/AE-ZEKX4YYA. PricingSimilarity to your system is not implied. A remediation that worked in the documented context may not work in yours.