{"rule_id":"AB-031","category":"payments","icon":"🔓","title":"Payment Challenge Decodable","short_description":"The payment request your site sends is properly formatted and can be decoded by agents.","user_value":"If agents can't decode the payment request, they can't pay — even if they want to.","wrong_example":"Payment request is malformed. Agents can't parse it to know what to pay.","right_example":"Payment request is well-formed and agents can decode it to complete payment.","effort_hint":"complex","estimated_cost":"$100+","severity":"high","pillar":"executability","version":"1.0.0","counted_in_score":true,"check":{"type":"content_parse","sources":["x402"],"target":"/passport/request"},"fix":{"eligible":false,"type":"none","note":"Ensure Payment-Required header contains valid base64-encoded JSON"},"checklist_anchor":"#AB-031","checklist_url":"/agent-readiness-checklist#AB-031","html_url":"/rules/AB-031","json_url":"/rules/AB-031.json","related_rules":[{"rule_id":"AB-030","title":"Paid Endpoint Response","category":"payments"},{"rule_id":"AB-032","title":"Payment Required Header","category":"payments"},{"rule_id":"AB-033","title":"Payment Recipient","category":"payments"},{"rule_id":"AB-034","title":"Payment Amount","category":"payments"},{"rule_id":"AB-035","title":"Payment Discovery File","category":"payments"},{"rule_id":"AB-038","title":"Payment Facilitator","category":"payments"},{"rule_id":"AB-070","title":"Lightning Payment Support","category":"payments"},{"rule_id":"AB-071","title":"Lightning Payment Details","category":"payments"},{"rule_id":"AB-088","title":"MPP (Machine Payments Protocol) Support","category":"payments"},{"rule_id":"AB-093","title":"SPT (Stripe Payment Terms) Support","category":"payments"}]}