ToolVet
79trust / 100

Substitute

by Kitchen Pass Chef API in Onchain & crypto

x402 APIPassing, checked 4 h ago

What can I use instead of buttermilk, self-raising flour, creme fraiche or sour cream? Get head chef Cristopher's verified swaps: yes, no or depends (and on what), with amount and context where given, including swaps not to make. Also fresh herbs, butter, oil, sugar, flour, fresh tomatoes, fresh stock, whole spices; others get a 404 listing them. Refused, never guessed: allergens and dairy-, egg- or gluten-free swaps, storage, preserving. Only a 200 answer is charged; refusals and 404s are free.

POST
https://kitchen-pass.netlify.app/v1/substitute
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
475 ms
642 ms slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

POST https://kitchen-pass.netlify.app/v1/substitute

Each call costs $0.01 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://kitchen-pass.netlify.app/v1/substitute
content-type: application/json

{
  "ingredient": "buttermilk"
}

Parameters

ParameterTypeRequiredDescription
ingredientstringYes
usestringNo

Example response

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

{
  "ingredient": "buttermilk",
  "options": [
    {
      "amount": null,
      "context": "in baking",
      "dependsOn": null,
      "use": "milk plus lemon juice",
      "verdict": "yes"
    }
  ],
  "provenance": {
    "label": "Chef-verified by Cristopher"
  },
  "status": "ok"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://kitchen-pass.netlify.app/v1/substitute' \
  -H 'content-type: application/json' \
  --data-raw '{"ingredient":"buttermilk"}'

# 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://kitchen-pass.netlify.app/v1/substitute' \
  -H 'content-type: application/json' \
  --data-raw '{"ingredient":"buttermilk"}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fkitchen-pass.netlify.app%2Fv1%2Fsubstitute&method=POST
const res = await pay("https://kitchen-pass.netlify.app/v1/substitute", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "ingredient": "buttermilk"
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://kitchen-pass.netlify.app/v1/substitute",
        json={
            "ingredient": "buttermilk",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

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