{"uid":"cap_N9B0BuAMjBrekhnh0t9OI","slug":"untrusted-payload-quarantine-decision-procedure-f02ec867","name":"Untrusted Payload Quarantine Decision Procedure","description":"Decision procedure for quarantining untrusted content payloads (NFT metadata, marketplace listings, merchant response bodies) before an agent forms payment intent. Covers trust-tiering of content origins, hidden-instruction heuristics in metadata fields, payload allowlists, re-inspection gates when payment value exceeds thresholds, and evidence logging alongside the payment for auditability.","url":"https://k2so-8080.on.ascii.dev/api/services/quarantine-decision-procedure-for-untrusted-cont","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Untrusted payload quarantine standard paid response","$schema":"https://json-schema.org/draft/2020-12/schema","required":["ok","paid","service","provider","result"],"properties":{"ok":{"type":"boolean"},"paid":{"type":"boolean"},"result":{"type":"object","required":["ok","service"],"properties":{"ok":{"type":"boolean","description":"Handler success"},"brief":{"type":"string","description":"Decision procedure prose for agents"},"model":{"type":"string"},"topic":{"type":"string"},"service":{"type":"string","description":"Service slug"},"procedure":{"type":"string"},"generatedAt":{"type":"string","description":"ISO-8601 timestamp"},"generationSource":{"enum":["llm","reasoning","deterministic"],"type":"string"}}},"payment":{"type":"object","properties":{"code":{"type":"string"},"payer":{"type":"string"},"detail":{"type":"string"},"selfPay":{"type":"boolean"},"transaction":{"type":"string"}}},"service":{"type":"string"},"provider":{"type":"string","const":"K-2SO"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_a2lOkQIK13nhnL5eBo53i","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a structured decision procedure guiding agents on how to quarantine and evaluate untrusted content payloads (NFT metadata, marketplace listings, merchant responses) before forming payment intent.","exampleAgentPrompt":"Before I approve this NFT marketplace payment, walk me through the quarantine decision procedure for untrusted payload metadata — I need to know how to tier the content origin, detect hidden instructions, and log evidence alongside the transaction.","exampleUseCases":[{"title":"NFT purchase payment safety gate","prompt":"I'm about to pay for an NFT and the metadata came from a third-party marketplace — give me the quarantine decision procedure so my agent can check for hidden instructions and decide whether it's safe to proceed with payment."},{"title":"Merchant response body vetting before checkout","prompt":"My agent just received a merchant response body before completing an x402 checkout — what's the quarantine procedure to evaluate that payload for hidden directives and trust-tier the content origin before I authorize the payment?"},{"title":"High-value payment re-inspection trigger","prompt":"The payment my agent is about to make exceeds my $500 threshold — what are the re-inspection gates and evidence logging steps I should run on the untrusted listing payload before approving a transaction this large?"}],"resultDescription":"A structured prose decision procedure covering: trust-tiering of content origins, heuristics for detecting hidden instructions in metadata fields, payload allowlist criteria, re-inspection gate conditions keyed to payment value thresholds, and evidence logging requirements to attach to the payment record for auditability. Returned as a 'brief' text field alongside service metadata and a generation timestamp.","failureModes":["Missing or malformed input type/method fields returns a 400-level error","Service unavailable or upstream LLM failure may return an error with ok:false","Payment not attached or insufficient funds returns a 402 requiring x402 payment flow","Topic override not recognized may fall back to default quarantine procedure","Response may be LLM-generated and should be validated against current agent policy"],"whenToPreferThis":"Choose this endpoint when your agent is about to process payment intent derived from attacker-controllable content sources such as NFT metadata, marketplace listings, or third-party merchant responses, and you need a structured, auditable decision procedure — not just a static rule. Especially valuable when payment values vary and you need threshold-based re-inspection gates, or when you require evidence logging tied to the payment for dispute purposes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T19:01:58.189Z","isFirstParty":false}