{"uid":"cap_8l6roXKZGkUOrurjsv538","slug":"x402-challenge-payability-and-payment-scheme-compatibility-check-d859daab","name":"x402 Challenge Payability and Payment Scheme Compatibility Check","description":"Paid agent-facing brief on x402 challenge payability and payment-scheme compatibility check: agent-side procedure that grades an incoming 402 challenge before any signature is attempted, verifying challenge version (v1 vs v2), network scheme (eip155: 8453, solana, xrpl, skale), whether the agent's wallet client has a registered scheme for that network, and price against spend caps. Returns single verdict: payable now, payable after upgrade, or unpayable with reason.. Blunt decision procedure,","url":"https://k2so.wrong.systems/api/services/x402-challenge-payability-and-payment-scheme-com?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"x402 challenge payability and payment-scheme compatibility check: agen paid response","$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":"x402-challenge-payability-and-payment-scheme-com","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"x402-challenge-payability-and-payment-scheme-com","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_1G-FKjY8zHgivFu7MJ2jq","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 paid AI-generated decision procedure brief assessing whether an x402 challenge is payable and compatible with a given payment scheme, for autonomous agent use.","exampleAgentPrompt":"Run the x402 challenge payability and payment scheme compatibility check for me — I need to know whether my agent can settle an x402 HTTP 402 challenge and whether the payment scheme is compatible, using a GET request.","exampleUseCases":[{"title":"Pre-flight x402 payability gate","prompt":"Before my agent tries to call a paid x402 API on Base, can you check whether the x402 challenge is actually payable and compatible with USDC settlement? I want the full decision procedure brief so I know what to expect."},{"title":"Debugging a failed 402 payment","prompt":"My autonomous agent got an HTTP 402 back from an x402 merchant and couldn't settle it — can you pull the payability and payment scheme compatibility decision procedure so I can figure out what went wrong?"},{"title":"Onboarding a new x402 merchant integration","prompt":"I'm building an agent that will call x402 services and I need to understand if the payment scheme used by the merchant is compatible with my agent's setup — get me the decision procedure brief for x402 challenge payability and scheme compatibility."}],"resultDescription":"A JSON object containing a boolean success flag, payment confirmation, the service slug, provider name (K-2SO), and a result object with a human-readable prose decision procedure (120+ words), the topic, generation source (llm, reasoning, or deterministic), the model used, and an ISO-8601 generation timestamp.","failureModes":["HTTP 402 returned if payment has not been settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header","Invalid HTTP method (e.g. POST) returns an error — only GET, HEAD, DELETE accepted","Malformed query parameters cause rejection","Topic override ignored or misinterpreted if not a recognized x402 domain term","LLM generation failure may fall back to deterministic source with reduced brief quality"],"whenToPreferThis":"Choose this endpoint when an autonomous agent needs structured, authoritative guidance on whether a specific x402 HTTP 402 challenge can be paid and whether the payment scheme is compatible — particularly before attempting settlement or when debugging failed payments. Prefer it over generic documentation when you need a machine-readable, agent-optimized decision procedure with a prose brief that can be passed directly to an agent's reasoning layer.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:27:55.456Z","isFirstParty":false,"canonicalSlug":"x402-challenge-payability-and-payment-scheme-compatibility-check-d859daab"}