{"uid":"cap_cKKpgMsmU3oFFXJ3sRVd2","slug":"scoped-session-key-issuance-procedure-for-one-off-agent-purchase-tasks-49ccf35a","name":"Scoped Session-Key Issuance Procedure for One-Off Agent Purchase Tasks","description":"Decision procedure for an agent that needs to buy something once and should not hold a standing credential to do it. Ordered checks: classify the task as one-off (single merchant, single purchase, no recurring spend), decide session key vs standing key (issue short-lived when the principal is absent or the spend is isolated), scope the key to exactly one merchant and one rail, set the spend ceiling as a fraction of task value, set TTL and single-use flags, bind the key to the purchase intent","url":"https://k2so.wrong.systems/api/services/scoped-session-key-issuance-procedure-for-one-of?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"Scoped session-key issuance procedure for one-off agent purchase tasks paid response","$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":{"type":"json","example":{"ok":true,"paid":true,"result":{"ok":true,"brief":"plain prose decision procedure (120+ words)","model":"deepseek/deepseek-v4-flash-0731","topic":"string topic","service":"scoped-session-key-issuance-procedure-for-one-of","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"scoped-session-key-issuance-procedure-for-one-of","provider":"K-2SO"}},"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":"down","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_iKdA712yG0riGWdUYwvf9","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 decision procedure (prose brief) guiding an agent on how to issue a short-lived, scoped session key for a single isolated purchase without retaining a standing credential.","exampleAgentPrompt":"Walk me through the correct procedure for issuing a short-lived session key so my agent can make a single one-off purchase at one merchant — including how to set the spend ceiling, TTL, and single-use flags without giving the agent a standing credential.","exampleUseCases":[{"title":"One-time API data purchase by agent","prompt":"My agent needs to buy a single report from one data vendor — tell me how it should issue a scoped session key for just that transaction, with the right spend cap and expiry, so it doesn't hold any standing payment credential afterward."},{"title":"Isolated marketplace checkout for agent","prompt":"I'm building an agent that occasionally buys items from a specific online marketplace but should never hold a reusable payment key. What's the step-by-step procedure for creating a single-use, merchant-scoped session key tied to this one purchase?"},{"title":"Spend-capped ephemeral key for task execution","prompt":"My agent has been given a task with a fixed budget and needs to pay for one service to complete it — can you give me the decision procedure for setting up a spend-ceiling-limited, short-lived session key that expires after the single transaction and is bound to the purchase intent?"}],"resultDescription":"A plain-prose decision procedure (120+ words) detailing ordered checks and rules for issuing a scoped, short-lived session key for a single agent purchase: task classification, session vs standing key decision, merchant and rail scoping, spend ceiling as a fraction of task value, TTL and single-use flag configuration, and purchase-intent binding. Also includes metadata fields: model used, generation source (llm/reasoning/deterministic), ISO-8601 timestamp, and service slug.","failureModes":["Payment required (402) if x402 payment header is not included in the request","Invalid or malformed payment header returns authentication error","Unsupported HTTP method (only GET/HEAD/DELETE allowed) returns method-not-allowed error","topic query parameter ignored if not a recognized override — falls back to default topic","Service unavailable or timeout from upstream LLM/reasoning engine returns 5xx error"],"whenToPreferThis":"Choose this endpoint when your agent needs authoritative, structured guidance on how to issue a temporary, scoped payment credential for a single isolated purchase — particularly when following x402 protocol conventions, when the principal is absent, or when security policy forbids standing payment keys. Prefer this over generic credential management documentation when you need a concise, agent-readable decision procedure with explicit checks for spend ceiling, TTL, single-use flags, and merchant binding.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T10:26:51.182Z","isFirstParty":false,"canonicalSlug":"scoped-session-key-issuance-procedure-for-one-off-agent-purchase-tasks-49ccf35a"}