ToolVet
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Evm Slippage Bounds Check

by EVM Slippage Bounds Check in Onchain & crypto

x402 APIPassing, checked 1 h ago

EVM Slippage Bounds Check: checks expected and minimum output against a maximum slippage policy using only bounded caller-supplied values. Call when you need a bounded evm slippage bounds check result 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 JSON. Price: $0.00…

POST
https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
9 ms
49 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check

Each call costs $0.001 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check
content-type: application/json

{
  "expected_output_raw": "1000000",
  "maximum_slippage_bps": 150,
  "minimum_output_raw": "990000"
}

Parameters

ParameterTypeRequiredDescription
expected_output_rawstringYesExpected Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention.
maximum_slippage_bpsintegerYesMaximum Slippage Bps supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention.
minimum_output_rawstringYesMinimum Output Raw supplied to EVM Slippage Bounds Check; used only for this bounded calculation and processed in memory without retention.

Example response

The provider's example. We can't check it without paying.

{
  "evidence": {
    "external_calls": 0,
    "input_sha256": "5dc5df2b52d98e3702891cadc557bb1b15650ccede841dc6c0a42606eb549a31",
    "retained": false
  },
  "operation": "evm_preflight:evm_slippage_bounds_check",
  "result": {
    "slippage_bps": 100,
    "within_policy": true
  },
  "schema": "delx/util-evm-slippage-bounds-check/v1",
  "status": "pass"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check' \
  -H 'content-type: application/json' \
  --data-raw '{"expected_output_raw":"1000000","maximum_slippage_bps":150,"minimum_output_raw":"990000"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check' \
  -H 'content-type: application/json' \
  --data-raw '{"expected_output_raw":"1000000","maximum_slippage_bps":150,"minimum_output_raw":"990000"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.delx.ai%2Fapi%2Fv1%2Fx402%2Fevm-slippage-bounds-check&method=POST
const res = await pay("https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "expected_output_raw": "1000000",
    "maximum_slippage_bps": 150,
    "minimum_output_raw": "990000"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.delx.ai/api/v1/x402/evm-slippage-bounds-check",
        json={
            "expected_output_raw": "1000000",
            "maximum_slippage_bps": 150,
            "minimum_output_raw": "990000",
        },
    )
    print(res.status_code, res.text)

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