ToolVet
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X402 Delivery Content Type Check

by X402 Delivery Content Type Check in Onchain & crypto

x402 APIPassing, checked 27 min ago

X402 Delivery Content Type Check: compares delivery content type with buyer-accepted media types using only bounded caller-supplied values. Call when you need a bounded x402 delivery content type check result before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Delivery Content Type Check as versioned d…

POST
https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
22 ms
135 ms slowest 5%
Last check
Passed
27 min ago, next in 5 min

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed

How to call it

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

{
  "accepted": [
    "application/json"
  ],
  "content_type": "application/json; charset=utf-8"
}

Parameters

ParameterTypeRequiredDescription
acceptedarray of stringYesAccepted supplied to X402 Delivery Content Type Check; used only for this bounded calculation and processed in memory without retention.
content_typestringYesContent Type supplied to X402 Delivery Content Type 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": "17d22f796e7932f46bbb49530f843fcbb42e7bea6267a2306a495865b24fc926",
    "retained": false
  },
  "operation": "delivery_contract:x402_delivery_content_type_check",
  "result": {
    "accepted": true,
    "content_type": "application/json"
  },
  "schema": "delx/util-x402-delivery-content-type-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/x402-delivery-content-type-check' \
  -H 'content-type: application/json' \
  --data-raw '{"accepted":["application/json"],"content_type":"application/json; charset=utf-8"}'

# 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/x402-delivery-content-type-check' \
  -H 'content-type: application/json' \
  --data-raw '{"accepted":["application/json"],"content_type":"application/json; charset=utf-8"}' \
  | 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%2Fx402-delivery-content-type-check&method=POST
const res = await pay("https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "accepted": [
      "application/json"
    ],
    "content_type": "application/json; charset=utf-8"
  }),
});
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/x402-delivery-content-type-check",
        json={
            "accepted": [
                "application/json",
            ],
            "content_type": "application/json; charset=utf-8",
        },
    )
    print(res.status_code, res.text)

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