Read USDC or native token balance for an address on Base or Solana

[
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "3MzJUA57HRTVaxWy111qxTQxnoy2ihBJ845PWNmWmBb5",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x87fc8c5b2c5000d50d6808f3526eeec57e240211",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "address": "0xd398253077178d60eeaa519c1ecd67eb82e6b382",
          "chain": "base",
          "token": "USDC"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "type": "json"
      },
      "related": [
        "/v1/models",
        "/.well-known/x402"
      ]
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "address": {
                  "description": "Wallet address (0x… on Base, base58 on Solana)",
                  "type": "string"
                },
                "chain": {
                  "enum": [
                    "base",
                    "solana"
                  ],
                  "type": "string"
                },
                "token": {
                  "default": "USDC",
                  "description": "USDC | ETH | SOL | NATIVE | ERC20 contract address / SPL mint",
                  "type": "string"
                }
              },
              "required": [
                "chain",
                "address"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://openrelay.hggfffdfy687.workers.dev/tools/wallet/balance"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://openrelay.hggfffdfy687.workers.dev/tools/wallet/balance");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://openrelay.hggfffdfy687.workers.dev/tools/wallet/balance")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header