{"uid":"cap_iqvQEzmsAW3win6_wNyUE","slug":"txguard-x402-base-api-pre-signing-transaction-risk-simulation-26bb2a8a","name":"TxGuard x402 Base API – Pre-Signing Transaction Risk Simulation","description":"Fail-closed pre-signing risk inspection. This service never signs, broadcasts, or bridges assets.","url":"https://50-7-41-26.sslip.io/v1/simulate","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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_gQm-SjI4ZwgRZc2tVSpo9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Performs fail-closed pre-signing risk inspection of blockchain transactions, flagging dangerous or suspicious activity before any signing or broadcasting occurs.","exampleAgentPrompt":"Before I sign this transaction interacting with contract 0xAbC...123 on Base, run a TxGuard fail-closed risk inspection on the calldata and tell me if it's safe to proceed.","exampleUseCases":[{"title":"DeFi swap safety check","prompt":"I'm about to approve a Uniswap swap on Base — can you run a pre-signing risk inspection on this transaction calldata to make sure there's nothing malicious before I sign?"},{"title":"NFT contract interaction screening","prompt":"Before I sign this NFT mint transaction on Base with contract 0xDead...Beef, can you simulate it through TxGuard and tell me if there are any red flags or risk factors I should know about?"},{"title":"Unknown contract address vetting","prompt":"Someone sent me a transaction request involving a contract I don't recognize on Base — can you do a fail-closed risk check on it before I approve anything, and tell me if it looks like a drainer or scam?"}],"resultDescription":"Returns a risk inspection result indicating whether the transaction is safe or should be blocked (fail-closed), along with identified threat categories, a risk score, and human-readable reasons explaining any flagged risks. No signing, broadcasting, or asset movement occurs.","failureModes":["Malformed or incomplete transaction payload returns a 400-level error","Unknown or unsupported chain/network returns an error","Service unavailable or timeout results in fail-closed rejection by default","Payment not included or insufficient USDC results in 402 Payment Required","Ambiguous calldata may result in incomplete risk analysis with lower confidence"],"whenToPreferThis":"Choose this endpoint when you need a fail-closed pre-signing safety gate for transactions on Base before any wallet signs or broadcasts them. Ideal for agents managing wallets autonomously, DeFi workflows requiring human-in-the-loop risk gates, or any scenario where executing a malicious transaction would be catastrophic. Prefer this over general blockchain simulation tools when security and risk-flagging — not just execution simulation — is the primary concern.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:36:11.473Z","isFirstParty":false}