{"uid":"cap_e_0ElIgz0zgXzexOxH9qN","slug":"cryptovar-var-artifact-verifier-3bdc0b68","name":"CryptoVar VaR Artifact Verifier","description":"Verify a CryptoVar Black-Scholes VaR artifact by replaying its parameters, result and audit proof. 0.10 USDC. Returns valid true/false and the expected SHA-256 proof. An invalid artifact is a completed verification, not a service failure. CryptoVar artifacts only; no certification of model assumptions or future losses. Automatic delivery, 30-minute SLA. Idempotency-Key required.","url":"https://www.securaw.com/cryptovar/x402/risk_verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"service":{"enum":["risk_verify"],"type":"string"},"parameters":{"type":"object","title":"VerifyInput","required":["parameters","var","audit","audit_proof"],"properties":{"var":{"type":"number","title":"Var","description":"Copy result.var from risk_snapshot, or scenario.var from risk_compare. Same value units as parameters.S0."},"audit":{"type":"object","title":"Audit","description":"Copy the complete original result.audit or scenario.audit without editing. At most 8000 serialized bytes. Do not include proof_receipt."},"parameters":{"type":"object","title":"RiskInput","required":["S0","sigma","T","seed"],"properties":{"N":{"type":"integer","title":"N","default":10000,"maximum":20000,"minimum":1000,"description":"Monte Carlo path count, 1000 to 20000; default 10000."},"T":{"type":"number","title":"T","maximum":10,"description":"Horizon in years: one day = 1/365; seven days = 7/365.","exclusiveMinimum":0},"S0":{"type":"number","title":"S0","maximum":1000000000000,"description":"Single exposure value; VaR uses the same currency/value units. Not a list of holdings.","exclusiveMinimum":0},"mu":{"type":"number","title":"Mu","default":0,"maximum":5,"minimum":-5,"description":"Annualized drift as a decimal; defaults to zero."},"seed":{"type":"integer","title":"Seed","maximum":2147483647,"minimum":0,"description":"Integer random seed. Reuse inputs and seed to reproduce the calculation."},"alpha":{"type":"number","title":"Alpha","default":0.99,"maximum":0.999,"minimum":0.9,"description":"Confidence level as a decimal: 0.99 means 99%."},"sigma":{"type":"number","title":"Sigma","maximum":5,"minimum":0,"description":"Annualized volatility as a decimal: 0.6 means 60% per year."},"engine":{"enum":["black_scholes"],"type":"string","title":"Engine","default":"black_scholes","description":"Supported model: black_scholes for a single exposure."}},"description":"Copy inputs from a risk_snapshot delivery, or parameters from a risk_compare scenario, without changing their numeric values.","additionalProperties":false},"audit_proof":{"type":"string","title":"Audit Proof","pattern":"^[0-9a-f]{64}$","description":"Copy original audit_proof exactly: 64 lowercase hexadecimal characters. A validly formed but incorrect proof returns valid:false; the verification service is still fulfilled."}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_DrML4Iz8HnIK7DAwDieP2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Replays a CryptoVar Black-Scholes VaR calculation from its original parameters and audit proof to confirm the result is authentic and unaltered.","exampleAgentPrompt":"Can you verify this CryptoVar artifact for me? The exposure was $50,000, sigma 0.80, T = 1/365, seed 42, alpha 0.99, N 10000, and the VaR result was $3,200. Here are the full audit object and audit proof from the original snapshot — please confirm whether the artifact is valid and show me the expected SHA-256 proof.","exampleUseCases":[{"title":"Validating a received risk report","prompt":"I got a CryptoVar risk_snapshot report from a counterparty claiming a 99% VaR of $12,500 on a $200,000 BTC exposure with sigma 0.65, T = 7/365, seed 99, N 10000. Can you replay it against the attached audit and proof to tell me if the artifact is genuine?"},{"title":"Pre-trade risk audit check","prompt":"Before I sign off on this trade book entry, verify the CryptoVar artifact: S0 = 1,000,000, sigma = 0.55, T = 1/365, seed 7, alpha 0.99, N 10000, VaR = 34,200, and here's the full audit block and proof — is it valid?"},{"title":"Automated compliance pipeline integrity check","prompt":"As part of our daily compliance run, check this batch of CryptoVar snapshots — start with this one: exposure 500000, sigma 0.90, T = 7/365, seed 1234, N 20000, alpha 0.99, VaR 180000. Paste the audit and proof below and confirm whether the SHA-256 proof checks out."}],"resultDescription":"Returns a JSON object with a boolean 'valid' field indicating whether the replayed calculation matches the supplied VaR and audit proof, plus the expected SHA-256 proof hash for the artifact. An invalid result (false) means the artifact failed verification, not a service error.","failureModes":["Missing or malformed audit object causes a 400 error","Audit object exceeds 8000 serialized bytes limit","Idempotency-Key header absent causes rejection","Parameters outside allowed ranges (e.g. N < 1000, sigma < 0, alpha < 0.9) cause validation errors","Artifact from a non-CryptoVar source returns invalid","Supplying proof_receipt inside the audit object causes a processing error","Payment not attached or insufficient USDC causes 402 response"],"whenToPreferThis":"Use this endpoint when you need to cryptographically confirm that a CryptoVar Black-Scholes VaR artifact has not been altered — i.e., that the VaR number, parameters, and audit block are mutually consistent and match the SHA-256 proof. This is the only endpoint for replaying and verifying CryptoVar artifacts; it does not model-validate assumptions or certify future accuracy, only artifact integrity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:34:44.361Z","isFirstParty":false,"canonicalSlug":"cryptovar-var-artifact-verifier-3bdc0b68"}