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EVM Slippage Bounds Check
x402
EVM Slippage Bounds Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates whether the actual slippage on an EVM token swap falls within a specified maximum slippage policy, returning the computed slippage in basis points and a pass/fail result.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Slippage Bounds Check: EVM Slippage Bounds Check checks expected and minimum output against a maximum slippage policy from bounded caller-supplied values without an external provider. Call EVM Slippage Bounds Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Slippage Bounds Check as versioned deterministic…
Output
Returns a JSON object containing the computed slippage in basis points (slippage_bps), a boolean indicating whether the trade is within the policy (within_policy), an overall status field ('pass' or 'fail'), and an evidence object with a SHA-256 hash of the inputs, a flag confirming no data was retained, and a count of external calls made (always 0).
Example use cases
Pre-trade slippage guard for DEX bot
“Before executing this Uniswap swap, verify the slippage is within my 50 bps policy — expected output is 5000000000 and minimum output is 4997500000.”
Autonomous agent DeFi safety check
“My trading agent is about to submit a swap with expected output 200000000000 and minimum output 198000000000 — is that within a 150 bps slippage limit?”
Batch trade preflight validation
“I'm running a series of EVM swaps and need to confirm each one stays under 200 bps slippage — for this trade the expected output is 1000000 and the minimum acceptable output is 980000.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-slippage-bounds-checkWhen to prefer
Choose this endpoint when you need a fast, stateless, privacy-preserving preflight check on EVM swap slippage before committing a transaction — particularly in autonomous agent workflows where you want a governed, auditable result (with SHA-256 input hash evidence) rather than computing slippage in your own code. Prefer it over manual calculation when you need the result logged with a verifiable evidence trail and zero data retention guarantees.
Side effects
- Missing required fields (minimum_output_raw, expected_output_raw, or maximum_slippage_bps) result in a validation error
- Non-numeric or malformed raw output strings may cause parsing failures
- Integer overflow if raw output values exceed safe integer bounds
- Payment failure if USDC balance is insufficient for the $0.001 per-call fee
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| minimum_output_raw | string | Minimum Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention. |
| expected_output_raw | string | Expected Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention. |
| maximum_slippage_bps | integer | Maximum Slippage Bps supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"slippage_bps": 100,
"within_policy": true
},
"schema": "delx/util-evm-slippage-bounds-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "5dc5df2b52d98e3702891cadc557bb1b15650ccede841dc6c0a42606eb549a31",
"external_calls": 0
},
"operation": "evm_preflight:evm_slippage_bounds_check"
}
}Tags
x402
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