{"id":"b4a91248-546b-4827-a3ae-9c92c11168aa","shortId":"jF7K7x","kind":"x402","title":"Detect MEV activity (sandwich attacks, arbitrage) in recent blocks via x402 micropayment.","tagline":"Detect MEV activity (sandwich attacks, arbitrage) in recent blocks via x402 micropayment.","description":"The MEV Scanner endpoint at httpay.xyz analyzes recent blockchain blocks to detect Maximal Extractable Value (MEV) activity, including sandwich attacks and arbitrage opportunities. It works by examining swap density and transaction patterns across specified blocks. The endpoint accepts query parameters for chain selection (e.g., `?chain=base`) and the number of blocks to scan (e.g., `?blocks=10`).\n\nThis is an x402 pay-per-call endpoint on the Base network. Each call costs $0.01 in USDC (maxAmountRequired of 10,000 base units at 6 decimals). No API keys or subscriptions are required — payment is handled inline via the x402 protocol's X-PAYMENT header or alternatively via MPP (Machine Payments Protocol) using pathUSD on Tempo at $0.01 per call. A free demo mode is available by appending `?demo=true` to the URL, limited to 10 calls per IP per hour.\n\nThe endpoint returns JSON and is accessible via HTTP GET. It is part of the httpay.xyz marketplace, which hosts over 300 pay-per-call endpoints across categories including crypto/finance, DeFi analytics, and data. Integration options include the x402-fetch npm package, the @httpay/mcp server for Claude/Cursor agents, or direct curl with payment headers. Note that the output schema example in the probe only echoes the endpoint description rather than showing actual MEV scan results, so the precise response structure is not fully documented.","tags":[],"capabilities":["mev-detection","sandwich-attack-detection","arbitrage-detection","blockchain-analysis","swap-density-analysis","transaction-pattern-analysis","x402-micropayment","base-network","usdc-payment","demo-mode"],"categories":["crypto","defi","data"],"synonyms":["MEV scanner","sandwich attack detector","arbitrage detector","MEV activity monitor","block analysis","DeFi MEV","maximal extractable value","frontrunning detection","swap analysis"],"warnings":["No actual response example available; the outputSchema example only echoes the endpoint description","No dedicated documentation page (/docs returns 404)","Query parameter schema is empty in the Bazaar extension — parameter names (chain, blocks) are only documented in the description string","Exact supported chains beyond 'base' are not documented"],"endpointUrl":"https://httpay.xyz/api/mev-scanner","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","chainId":8453,"version":"2"},"payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://httpay.xyz/api/mev-scanner","extensions":{"bazaar":{"info":{"input":{"type":"http","method":"GET","queryParams":{}},"output":{"type":"json","example":{"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. Params: ?chain=base&blocks=10. Demo: ?demo=true."}}},"schema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}}}},"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. Params: ?chain=base&blocks=10. Demo: ?demo=true.","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"json","example":{"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. Params: ?chain=base&blocks=10. Demo: ?demo=true."}}},"maxAmountRequired":"10000","maxTimeoutSeconds":60}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing ($0.01 USDC on Base) and basic parameter documentation. However, there is no actual response example — the outputSchema only echoes the description text — and no dedicated docs page exists (/docs returns 404). The precise response structure must be inferred from the endpoint name and 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'000':103 '10':80,102,159 '300':185 '6':107 'DeFi MEV' 'MEV activity monitor' 'MEV scanner' 'accept':62 'access':171 'across':57,191 'activ':3,15,41 'actual':237 'agent':213 'altern':130 'analyt':196 'analyz':31 'api':110 'append':151 'arbitrag':6,18,46 'arbitrage detector' 'arbitrage-detection' 'attack':5,17,44 'avail':149 'base':70,92,104 'base-network' 'block':9,21,34,59,75,79 'block analysis' 'blockchain':33 'blockchain-analysis' 'call':88,95,143,160,189 'categori':192 'chain':66,69 'claude/cursor':212 'cost':96 'crypto/finance':194 'curl':216 'data':198 'decim':108 'defi':195 'demo':146,152 'demo-mode' 'densiti':53 'descript':233 'detect':1,13,36 'direct':215 'document':249 'e.g':68,78 'echo':230 'endpoint':28,61,89,166,190,232 'examin':51 'exampl':225 'extract':38 'fetch':205 'free':145 'frontrunning detection' 'fulli':248 'get':174 'handl':118 'header':128,219 'host':183 'hour':164 'http':173 'httpay.xyz':30,180 'httpay/mcp':209 'includ':42,193,201 'inlin':119 'integr':199 'ip':162 'json':168 'key':111 'limit':157 'machin':133 'marketplac':181 'maxamountrequir':100 'maxim':37 'maximal extractable value' 'mev':2,14,26,40,238 'mev-detection' 'micropay':12,24 'mode':147 'mpp':132 'network':93 'note':220 'npm':206 'number':73 'opportun':47 'option':200 'output':223 'packag':207 'paramet':64 'part':177 'pathusd':137 'pattern':56 'pay':86,187 'pay-per-cal':85,186 'payment':116,127,134,218 'per':87,142,161,163,188 'precis':243 'probe':228 'protocol':123,135 'queri':63 'rather':234 'recent':8,20,32 'requir':115 'respons':244 'result':240 'return':167 'sandwich':4,16,43 'sandwich attack detector' 'sandwich-attack-detection' 'scan':77,239 'scanner':27 'schema':224 'select':67 'server':210 'show':236 'specifi':58 'structur':245 'subscript':113 'swap':52 'swap analysis' 'swap-density-analysis' 'tempo':139 'transact':55 'transaction-pattern-analysis' 'true':153 'unit':105 'url':156 'usdc':99 'usdc-payment' 'use':136 'valu':39 'via':10,22,120,131,172 'work':49 'x':126 'x-payment':125 'x402':11,23,84,122,204 'x402-fetch':203 'x402-micropayment'","prices":[{"id":"6ba159e8-2fcf-4b5f-b98e-81ea9a40a2fc","listingId":"b4a91248-546b-4827-a3ae-9c92c11168aa","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"10000","chain":"base","payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","chainId":8453,"version":"2"},"payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://httpay.xyz/api/mev-scanner","extensions":{"bazaar":{"info":{"input":{"type":"http","method":"GET","queryParams":{}},"output":{"type":"json","example":{"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction 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Params: ?chain=base&blocks=10. Demo: ?demo=true."}}},"schema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}}}},"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. Params: ?chain=base&blocks=10. Demo: ?demo=true.","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"json","example":{"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. 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Demo: ?demo=true."}}},"maxAmountRequired":"10000","maxTimeoutSeconds":60}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":60},"createdAt":"2026-04-21T18:32:34.948Z"}],"sources":[{"listingId":"b4a91248-546b-4827-a3ae-9c92c11168aa","source":"x402_bazaar","sourceId":"https://httpay.xyz/api/mev-scanner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.948Z","lastSeenAt":"2026-04-22T04:02:50.434Z"}],"details":{"listingId":"b4a91248-546b-4827-a3ae-9c92c11168aa","quickStartSnippet":"# Free demo (no payment needed, 10 calls/IP/hour)\ncurl \"https://httpay.xyz/api/mev-scanner?chain=base&blocks=10&demo=true\"\n\n# With x402 payment (Node.js)\nimport { withPayment } from \"x402-fetch\";\nconst res = await withPayment(\n  fetch(\"https://httpay.xyz/api/mev-scanner?chain=base&blocks=10\"),\n  wallet\n);","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"json","example":{"description":"MEV Scanner — detects MEV activity (sandwich attacks, arbitrage) in recent blocks by analyzing swap density and transaction patterns. 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