{"uid":"cap_HBsWYYvOtykh5AfGnzKuw","slug":"obol-evm-calldata-guard-pre-sign-safety-verdict-b0c8fafa","name":"OBOL EVM Calldata Guard — Pre-Sign Safety Verdict","description":"Pre-trade safety for AI agents on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB and Robinhood Chain. Is this token a rug — and can I sell it again? Signed verdicts before you buy, approve, send or sign: token rug/honeypot check with buy-sell tax, honeypot sell-simulation, pre-sign calldata guard (unlimited-approve / setApprovalForAll / drain-in-multicall), wallet risk with sanctions screening, tx preflight, and a launch feed with safety overlays. Plus unique Bitcoin forensics no RPC gives you: money-graph role, whale and exchange fingerprinting, Satoshi-era provenance, validation-gated block anomalies, and broadcast-fee timing. Every response Ed25519-signed and independently verifiable. Pay-per-call USDC on Base — no keys, no accounts, no signup. Free: /catalog, /llms.txt, and a preview for every paid SKU.","url":"https://obol-x402.fly.dev/v1/evm/guard","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","required":["to","data"],"properties":{"to":{"type":"string","description":"0x contract being called"},"data":{"type":"string","description":"0x calldata to decode"},"from":{"type":"string"},"chain":{"enum":["base","ethereum","arbitrum","optimism","polygon","bnb","robinhood"],"type":"string","default":"base"},"value":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"flags":[{"flag":"unlimited_approval","level":"critical"}],"guard":"pre-sign calldata decode","policy":"BLOCK","decoded":[{"amount":"UNLIMITED","spender":"0x…","function":"approve(address,uint256)"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Huq0CYPKXCciAawliSQL2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Decodes and audits raw EVM transaction calldata before signing, flagging unlimited approvals, drain-in-multicall, and setApprovalForAll attacks with a signed BLOCK/ALLOW policy verdict.","exampleAgentPrompt":"Before I sign this transaction, run a calldata guard check on this hex data and tell me if it's trying to set an unlimited approval or drain my wallet — I need a BLOCK or ALLOW verdict with the decoded function details.","exampleUseCases":[{"title":"Block unlimited token approval","prompt":"I'm about to confirm a token swap on Base and the dApp is asking me to sign an approve() call — can you decode the calldata and tell me if it's setting an unlimited allowance I should worry about?"},{"title":"Detect multicall wallet drain","prompt":"This DeFi protocol wants me to sign a multicall transaction — run it through the calldata guard and flag if any of the nested calls are trying to drain my wallet or do something suspicious."},{"title":"Protect agent from setApprovalForAll","prompt":"My trading agent is about to sign a setApprovalForAll on an NFT contract — check the raw calldata first and give me a signed safety verdict before it goes through."}],"resultDescription":"A JSON object containing a 'policy' field (BLOCK or ALLOW), an array of 'flags' each with a flag name and severity level (e.g. critical), and a 'decoded' array breaking down the calldata into human-readable function name, spender address, and amount. The entire response is Ed25519-signed for independent verifiability. Costs $0.05 USDC per call via x402 on Base.","failureModes":["Malformed or non-decodable calldata returns a parse error","Unsupported chain or contract ABI yields incomplete decoded output","Payment not included or insufficient USDC triggers 402 Payment Required","Network timeout on fly.dev host returns 503","Calldata for a novel proxy pattern may not decode fully, reducing flag accuracy"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to validate raw EVM transaction calldata before signing — specifically to catch unlimited approvals, setApprovalForAll, or multicall drains. Unlike generic RPC simulation, OBOL returns a structured, Ed25519-signed BLOCK/ALLOW verdict designed for autonomous agent consumption. Prefer this over manual ABI decoding or simulation-only tools when you need a definitive, auditable policy decision rather than just a trace.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T09:27:21.237Z","isFirstParty":false}