curl --request GET \
  --url https://api-testnet.context.markets/v2/balance/{address} \
  --header 'Authorization: Bearer <token>'

{
  "address": "<string>",
  "usdc": {
    "tokenAddress": "<string>",
    "balance": "<string>",
    "settlementBalance": "<string>",
    "walletBalance": "<string>"
  },
  "outcomeTokens": [
    {
      "tokenAddress": "<string>",
      "marketId": "<string>",
      "outcomeIndex": 0,
      "outcomeName": "<string>",
      "balance": "<string>",
      "settlementBalance": "<string>",
      "walletBalance": "<string>"
    }
  ]
}