ToolVet
71trust / 100

Wallet Value

by Blackwood State Wallet Value in Onchain & crypto

x402 APIPassing, checked 2 h ago

Use when you need a wallet portfolio value in USD, a wallet net worth or token balances with USD value for a 0x address. Do not use for solana wallets, transaction history, NFTs, DeFi positions or long-tail tokens. Returns JSON with a wallet's USD value on Ethereum and Base in one call: native and major-token balances priced on-chain from Uniswap v3 pools on Base, per-chain totals and the tokens left unpriced for 0.005 USDC per call. Typical response time 5000 ms (p95). Category: Trading.

POST
https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
1.3 s
2.3 s slowest 5%
Last check
Passed
2 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://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value

Each call costs $0.005 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://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value
content-type: application/json

{
  "address": "0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf",
  "chains": [
    "base"
  ]
}

Parameters

ParameterTypeRequiredDescription
addressstringYesWallet address (0x...) on Ethereum and Base, e.g. 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
chainsarray of stringNoChains to value (ethereum and base when omitted), e.g. ["base"]

Example response

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

Example response, 30 lines
{
  "address": "0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf",
  "chains": {
    "base": 8.47,
    "ethereum": null
  },
  "errors": {},
  "holdings": [
    {
      "balance": "0.002360178464231316",
      "chain": "base",
      "contract": null,
      "priceUsd": 2420.0937,
      "symbol": "ETH",
      "valueUsd": 5.71
    },
    {
      "balance": "2.756539",
      "chain": "base",
      "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "priceUsd": 1,
      "symbol": "USDC",
      "valueUsd": 2.76
    }
  ],
  "note": "USD values use the on-chain price of the same asset on Base: its deepest Uniswap v3 pool against USDC or WETH (USDC counts as 1 USD). Ethereum tokens are priced through their Base counterpart (same issuer or canonical bridge); tokens without one, or without a liquid pool, are listed in unpriced and left out of the totals. Balances cover the native coin and a fixed list of major tokens; values are rounded to cents.",
  "totalUsd": 8.47,
  "unpriced": [],
  "updatedAt": "2026-10-18T04:14:44.193Z"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf","chains":["base"]}'

# 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://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf","chains":["base"]}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-gateway.blackwoodstate8.workers.dev%2Fv1%2Fwallet-value&method=POST
const res = await pay("https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf",
    "chains": [
      "base"
    ]
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value",
        json={
            "address": "0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf",
            "chains": [
                "base",
            ],
        },
    )
    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
2 h agoPassed4021.3 s$0.005
7 h agoPassed4022.3 s$0.005