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OnChaiNinja MEV Detection
x402
OnChaiNinja MEV Detection is a paid API for AI agents from nininonchain.vercel.app, paid per call via x402, $3/call, status unknown (last checked 2026-10-20).
Detects MEV (Maximal Extractable Value) activity for a specific transaction on a given blockchain chain
Price / call$3
Success—
StatusUnknown
How this service works
Alpha signals, whale tracking, rug scanning, and MEV protection across Base, Solana, Arbitrum, and more.
Output
Returns a JSON object indicating whether MEV was detected on the given transaction (e.g. {"mevDetected": false}), signaling whether the transaction was subject to front-running, sandwiching, or other MEV extraction techniques.
Example use cases
Sandwich attack check on a DEX swap
“I just swapped ETH for USDC on Base and I think I got sandwiched — can you check transaction 0xdeadbeef...1234 on Base for any MEV activity?”
Post-trade MEV audit on Arbitrum
“After my Arbitrum trade settled, I want to know if any MEV bots extracted value from transaction 0x9f8e7d...4321 — can you run a MEV scan on it?”
Solana transaction MEV verification
“Check this Solana transaction abc123XYZ...789 for front-running or sandwich bot activity — I want to know if MEV was detected before I use this DEX again.”
Technical details
Endpoint
GEThttps://nininonchain.vercel.app/api/mev/%7Bchain%7D/%7Btx%7D?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to determine post-hoc whether a specific on-chain transaction was subject to MEV extraction (front-running, sandwiching, back-running) across multi-chain environments including Base, Solana, and Arbitrum. Prefer this over generic block explorers when you need a structured, machine-readable MEV verdict rather than raw transaction data.
Side effects
- Invalid or unrecognized chain identifier — endpoint may return an error or empty result
- Transaction hash not found on the specified chain — may return not-found or null result
- Unsupported chain — chain not among Base, Solana, Arbitrum, or other supported networks
- Malformed transaction hash — returns validation error
- Payment failure — $3 USDC per call not fulfilled, request rejected
- Network timeout — blockchain RPC latency causing delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"mevDetected": false
}
}Tags
x402
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