ToolVet
71trust / 100

Cards Prices By Cert

by Card Hedge in Markets & finance

x402 APIPassing, checked 19 min ago

Get card information and pricing by grader certificate number.

POST
https://api.cardhedger.com/v1/agent/cards/prices-by-cert
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
1.0 s
1.3 s slowest 5%
Last check
Passed
19 min ago, next in 13 min

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://api.cardhedger.com/v1/agent/cards/prices-by-cert

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://api.cardhedger.com/v1/agent/cards/prices-by-cert
content-type: application/json

{
  "cert": "76676185",
  "grader": "PSA"
}

Parameters

ParameterTypeRequiredDescription
certstringYesCertificate number to lookup
daysintegerNoNumber of days of price history to retrieve (1-365, defaults to 180) Default: 180.
graderstringNoGrading company (defaults to PSA) Default: "PSA".

Example response

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

Example response, 36 lines
{
  "card": {
    "card_id": "1699670576265x928796749151534600",
    "category": "Baseball",
    "category_group": "Sports Cards",
    "description": "C.C. Sabathia 1999 Bowman Chrome Baseball",
    "image": "https://942284f33c575895b4be9de571ca6e40.cdn.bubble.io/d112/f1699670857725x475053799924132860/resized_20231111_024737.jpeg",
    "number": "344",
    "player": "C.C. Sabathia",
    "set": "1999 Bowman Chrome Baseball",
    "set_type": "Bowman Chrome Baseball",
    "variant": "Base"
  },
  "cert_info": {
    "cert": "50000000",
    "description": "1999 Bowman Chrome C.C. Sabathia 344",
    "gemrate_id": "25783324b9710f1366ca4d54f3dd4689c02b6885",
    "grade": "PSA 10",
    "grader": "psa",
    "universal_gemrate_id": "25783324b9710f1366ca4d54f3dd4689c02b6885"
  },
  "prices": [
    {
      "Grade": "PSA 10",
      "card_id": "1699670576265x928796749151534600",
      "closing_date": "2025-10-26T23:59:00.000Z",
      "price": "125.50"
    },
    {
      "Grade": "PSA 10",
      "card_id": "1699670576265x928796749151534600",
      "closing_date": "2025-10-25T23:59:00.000Z",
      "price": "122.00"
    }
  ]
}

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://api.cardhedger.com/v1/agent/cards/prices-by-cert' \
  -H 'content-type: application/json' \
  --data-raw '{"cert":"76676185","grader":"PSA"}'

# 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.cardhedger.com/v1/agent/cards/prices-by-cert' \
  -H 'content-type: application/json' \
  --data-raw '{"cert":"76676185","grader":"PSA"}' \
  | 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%2Fapi.cardhedger.com%2Fv1%2Fagent%2Fcards%2Fprices-by-cert&method=POST
const res = await pay("https://api.cardhedger.com/v1/agent/cards/prices-by-cert", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "cert": "76676185",
    "grader": "PSA"
  }),
});
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://api.cardhedger.com/v1/agent/cards/prices-by-cert",
        json={
            "cert": "76676185",
            "grader": "PSA",
        },
    )
    print(res.status_code, res.text)

Security scan

1 finding

  • Payment address changed recently in payment
    Payment address changed from 0xdc90e5ce046e3fd27a08ae0e3b581930ae4b4736 to 0x6374d02b4a48ba5f1aa7b4df70154c934330bea9

Recent checks

WhenResultHTTPTimePrice
19 min agoPassed4021.3 s$0.01
6 h agoPassed4021.0 s$0.01

History

18 Oct 2026Payment address changed from 0xdc90e5ce046e3fd27a08ae0e3b581930ae4b4736 to 0x6374d02b4a48ba5f1aa7b4df70154c934330bea9
17 Oct 2026Payment address changed from 0x2db832907e3ae0c582462ac7619e42be292d3927 to 0xdc90e5ce046e3fd27a08ae0e3b581930ae4b4736