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httpay.xyz MEV Scanner
x402
httpay.xyz MEV Scanner is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Detects MEV activity including sandwich attacks and arbitrage in recent blockchain blocks by analyzing swap density and transaction patterns
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
Returns detected MEV events (sandwich attacks, arbitrage) found in the scanned blocks, along with swap density metrics and transaction pattern analysis that reveal MEV bot activity.
Example use cases
Investigate if my transaction got sandwiched
“I just made a swap on Base and it felt expensive. Can you look back at the last few blocks and tell me if my transaction was sandwiched by MEV bots?”
Monitor competitor arbitrage strategies
“We're tracking what arbitrage bots are doing on Base. Scan the recent blocks and show me the patterns — what opportunities are they exploiting and how often?”
Audit exchange for MEV extraction
“Our exchange wants to ensure we're not being hit by front-runners. Check the last 20 blocks on Base for sandwich attacks and tell us how frequently they're happening.”
Technical details
Endpoint
POSThttps://httpay.xyz/api/mev-scannerWhen to prefer
Use this endpoint when you need a quick retrospective scan of recent blocks for MEV activity on Base or supported chains. Prefer this over the pre-swap MEV risk scorer when you want historical/forensic analysis rather than pre-trade risk assessment.
Side effects
- Invalid chain parameter returns error
- Unsupported chain identifier
- blocks parameter out of allowed range
- RPC node unavailable for the target chain
- Payment not processed (x402 payment required)
- Demo mode may return synthetic/limited data
Input
{
"chain": "base",
"blocks": 10
}Output
{
"tip": "MEV (Maximal Extractable Value) represents value extracted by block producers/searchers. High sandwich counts mean users are being front-run. Add ?demo=true for pre-computed sample.",
"meta": {
"x402": true,
"poweredBy": "Alfred Zhang 🫡"
},
"chain": "base",
"sources": [
"Base RPC (eth_getBlockByNumber)",
"Basescan Logs API"
],
"fetchedAt": "2026-06-13T04:05:53.922Z",
"blockRange": {
"to": 47267103,
"from": 47267094
},
"topMevBots": [],
"mevActivity": {
"totalMevTxs": 0,
"arbitrageTxs": 0,
"sandwichAttacks": 0,
"estimatedMevProfitUsd": "$0.00"
},
"flaggedBlocks": [],
"blocksAnalyzed": 10,
"anomalyThreshold": 10,
"avgSwapsPerBlock": 0,
"totalSwapsScanned": 0
}Schema · Response
{
"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."
}
}Tags
x402
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