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MEV Sandwich Loss Upper Bound
x402
MEV Sandwich Loss Upper Bound is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes a deterministic upper-bound price impact loss for a CPMM trade given trade size and pool reserves, without any blockchain or mempool access.
Price / call$0.001
Success—
StatusUnknown
How this service works
Upper-bound CPMM price impact loss for size vs reserves. Call when pre-trade MEV/slippage stress without mempool access. Returns impact_fraction and loss_notional as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Output
Returns a deterministic JSON object containing impact_fraction (the fraction of trade value lost to price impact) and loss_notional (the absolute notional loss in input asset units), computed purely from local CPMM math with no external data sources.
Example use cases
Pre-trade MEV stress test for DeFi bot
“Before my trading bot submits this swap of 1,000 USDC into the pool with 500,000 USDC reserve_in and 400,000 ETH reserve_out, what's the upper-bound sandwich loss I should expect?”
Slippage guard for agent-executed swap
“I'm about to execute a trade with amount_in of 250 and pool reserves of 80,000 in and 120,000 out — calculate the maximum impact fraction and notional loss so I can decide whether to proceed.”
Reserve sizing analysis for liquidity provider
“If a whale trades 10,000 tokens into my pool that has 300,000 reserve_in and 300,000 reserve_out, what's the worst-case price impact fraction they could inflict as a sandwich attack?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/mev-sandwich-upperWhen to prefer
Choose this endpoint when you need a fast, deterministic, advisory upper-bound on MEV sandwich loss for a CPMM trade and have no access to mempool data or live market feeds. It is ideal for pre-trade risk checks in automated agents, parameter validation in DeFi bots, or stress-testing reserve assumptions — without requiring RPC calls, API keys, or any external infrastructure.
Side effects
- Missing required fields (amount_in, reserve_in, reserve_out) return a validation error
- Zero or negative reserve values may cause division-by-zero or undefined behavior
- Extremely large trade sizes relative to reserves may return impact_fraction near or equal to 1
- Payment failure via x402 protocol returns 402 before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| amount_in | number | Trade size in input asset units |
| reserve_in | number | Pool reserve of input asset |
| reserve_out | number | Pool reserve of output asset |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-mev-sandwich-upper/v1",
"loss_notional": 0.990099009900991,
"impact_fraction": 0.00990099009900991
}
}Tags
x402
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