{"uid":"cap_KHHXHYGtZFZU94sVti1bE","slug":"phion-systems-preflight-payment-firewall-c7e08039","name":"phion.systems Preflight Payment Firewall","description":"Deterministic payment-policy firewall with a signed, short-lived decision receipt","url":"https://phion.systems/v1/paid/preflight-payment","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema"},"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_UBTFTCOsXbfBKjW6WN7Ns","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":"Runs a deterministic payment-policy check before an agent executes a payment, returning a signed, short-lived decision receipt authorizing or blocking the transaction.","exampleAgentPrompt":"Before you pay that $0.05 USDC service fee, run a preflight policy check to make sure it passes our spending rules and get back a signed authorization receipt I can use to proceed.","exampleUseCases":[{"title":"Cap agent micropayment spending","prompt":"Before my agent pays for that API call, check whether the $0.10 USDC charge is within our daily spending policy and give me a signed receipt so I can proceed safely."},{"title":"Firewall autonomous agent purchases","prompt":"My shopping agent is about to pay $2.50 USDC to a third-party service — run a preflight check against our payment policy first and block it if it doesn't pass, returning a signed decision either way."},{"title":"Audit trail for automated payments","prompt":"Every time our agent fleet makes a payment, I want a signed, time-stamped authorization receipt proving the transaction was policy-checked before it went through — can you run that preflight now for this $0.002 USDC call?"}],"resultDescription":"A cryptographically signed, short-lived decision receipt indicating whether the proposed payment is authorized or blocked under the configured policy, including a verdict status, policy reason code, expiry timestamp, and signature for downstream verification.","failureModes":["Payment intent fails policy rules — receipt returned with blocked verdict and reason code","Malformed or missing payment parameters — 400 error with validation details","Receipt has expired before downstream use — must re-call preflight","Policy configuration not found for agent identity — 404 or policy-not-configured error","Signature verification failure on receipt — indicates tampering or key mismatch"],"whenToPreferThis":"Use this endpoint when an AI agent needs a deterministic, auditable gate before executing any payment — especially in autonomous or multi-agent pipelines where you need a machine-verifiable signed receipt proving the transaction was policy-screened. Prefer this over ad-hoc spending checks when you need short-lived signed authorization tokens, strict policy enforcement, or an immutable audit trail for agent commerce compliance.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:43:10.917Z","isFirstParty":false}