{"uid":"cap_vva2cyFhU-LOj3DoHfQ_z","slug":"andromalius-x402-security-analysis-11003cbd","name":"Andromalius x402 Security Analysis","description":"Audit an x402 v2 payment challenge. Use when: Before signing a new or changed x402 payment requirement. Preview: https://api.andromalius.io/examples/challenge-audit. Buy: https://andromalius.io/buy. Safe client: https://andromalius.io/integrate/safe-client. Workflow: https://andromalius.io/workflows/agent-prepayment-policy. No arbitrary fetching or input retention. US business users 18+ only. Terms: https://andromalius.io/terms.","url":"https://api.andromalius.io/v1/audit/challenge","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"expected":{"type":"object","properties":{"asset":{"type":"string"},"payTo":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"},"scheme":{"type":"string"},"network":{"type":"string","example":"eip155:8453"},"resourceUrl":{"type":"string","format":"uri","maxLength":2048},"maxAmountAtomic":{"type":"string","pattern":"^(0|[1-9][0-9]*)$"},"maxTimeoutSeconds":{"type":"integer","maximum":86400,"minimum":30}},"additionalProperties":false},"paymentRequired":{"type":"object","description":"Decoded x402 v2 PAYMENT-REQUIRED object","additionalProperties":true},"paymentRequiredHeader":{"type":"string","maxLength":131072,"minLength":1,"description":"Base64 or base64url-encoded x402 v2 PAYMENT-REQUIRED value"}}},"responseSchema":{"type":"json","example":{"kind":"challenge-audit","score":100,"passed":true,"seller":{"brand":"Andromalius","contacts":{"legal":"legal@andromalius.io","privacy":"privacy@andromalius.io","support":"support@andromalius.io","security":"security@andromalius.io"},"policies":{"terms":"https://andromalius.io/terms","privacy":"https://andromalius.io/privacy","refunds":"https://andromalius.io/refunds","acceptableUse":"https://andromalius.io/acceptable-use"},"legalForm":"New York sole proprietor","legalName":"Richard Kowalczyk","eligibility":"United States business users age 18 or older","jurisdiction":"New York, United States"},"summary":"No findings","version":1,"findings":[],"observations":{},"scorePolicyVersion":"1.0.0","findingCodeRegistryVersion":"1.0.0"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Z7-wE64U011Oxf2pCgNfi","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Audits and scores an x402 payment challenge object, verifying policy compliance, payment parameters, and settlement evidence integrity","exampleAgentPrompt":"Audit this x402 payment-required header for me — expected asset USDC, payTo address 0xAbCd1234..., network eip155:8453, maxAmountAtomic 1000000 — and tell me the compliance score and any security findings.","exampleUseCases":[{"title":"Pre-payment x402 challenge validation","prompt":"Before my agent accepts this x402 payment, audit the payment-required header it received — expected asset USDC on eip155:8453, payTo 0x1234abcd5678ef000000000000000000000000ab, maxAmountAtomic 10000 — and flag any policy violations or suspicious findings."},{"title":"Detecting misconfigured x402 payment servers","prompt":"I just got an x402 payment-required response from a third-party API. Can you run a security audit on this base64-encoded payment-required header to check whether the payTo address, asset, and scheme look legitimate and match what I expected?"},{"title":"Continuous x402 compliance monitoring for agent fleet","prompt":"For each x402 challenge my agent fleet encounters, I want to validate the payment-required object against our policy — expected network eip155:8453, asset USDC, maxAmountAtomic 1000000 — and only proceed if the audit score is 100 with no findings."}],"resultDescription":"Returns a JSON object with a numeric compliance score (0–100), a boolean passed flag, a human-readable summary, a version number, a list of security findings (empty if clean), and an observations map. A score of 100 with an empty findings array indicates the challenge is fully compliant with the expected policy.","failureModes":["Malformed or non-base64 paymentRequiredHeader causes a 400 validation error","Mismatch between expected and actual payment parameters returns findings with failed checks","Missing required fields in the expected object causes schema validation failure","Network identifier not recognized (e.g. unsupported chain) may result in findings or errors","Expired or tampered payment-required objects will produce findings and a failed result"],"whenToPreferThis":"Choose this endpoint when you need an independent, policy-controlled security audit of an x402 payment challenge before your AI agent accepts or processes a payment. It is specifically designed for the x402 protocol and provides a structured compliance score with detailed findings, making it superior to generic HTTP inspection or manual parameter checking. Prefer it over rolling your own validation when operating in adversarial or multi-party environments where payment-required objects may be spoofed or misconfigured.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T19:28:19.027Z","isFirstParty":false}