ToolVet
77trust / 100

Nft Metadata

by NFT metadata in Onchain & crypto

x402 APIPassing, checked 42 min ago

Resolve one NFT (contract + tokenId) into normalized metadata: name, description, image, attributes and token standard (ERC-721 or ERC-1155). Reads the on-chain tokenURI/uri, then fetches and normalizes the metadata document (ipfs/ar/http/data), rewriting ipfs image links to a gateway URL. Returns `found:false` for non-NFT contracts. Live reads with automatic endpoint fallback.

POST
https://chain.openverbs.com/v1/nft-metadata
Price
$0.006
per call in USDC
Uptime
100%
last 30 days
Response time
554 ms
603 ms slowest 5%
Last check
Passed
42 min 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://chain.openverbs.com/v1/nft-metadata

Each call costs $0.006 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://chain.openverbs.com/v1/nft-metadata
content-type: application/json

{
  "chain": "ethereum",
  "contract": "0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB",
  "tokenId": "1"
}

Parameters

ParameterTypeRequiredDescription
chainstringNoEVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". One of: ethereum, base, arbitrum, optimism, polygon.
contractstringYesNFT contract address.
tokenIdstring or integerYesToken id (decimal or 0x-hex integer).

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.006.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain.openverbs.com/v1/nft-metadata' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"ethereum","contract":"0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB","tokenId":"1"}'

# 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://chain.openverbs.com/v1/nft-metadata' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"ethereum","contract":"0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB","tokenId":"1"}' \
  | 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 $0.006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.006" });
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 $0.006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fchain.openverbs.com%2Fv1%2Fnft-metadata&method=POST
const res = await pay("https://chain.openverbs.com/v1/nft-metadata", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "chain": "ethereum",
    "contract": "0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB",
    "tokenId": "1"
  }),
});
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 $0.006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.006"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://chain.openverbs.com/v1/nft-metadata",
        json={
            "chain": "ethereum",
            "contract": "0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB",
            "tokenId": "1",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
42 min agoPassed402510 ms$0.006
6 h agoPassed402587 ms$0.006
11 h agoPassed402166 ms$0.006
15 h agoPassed402556 ms$0.006
20 h agoPassed402176 ms$0.006
Show 10 older checks
25 h agoPassed402558 ms$0.006
30 h agoPassed402558 ms$0.006
34 h agoPassed402556 ms$0.006
39 h agoPassed402556 ms$0.006
43 h agoPassed402576 ms$0.006
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