Extracting Integer Values

In this example, we will extract the ETHBTC price from the raw JSON response and multiply it by 10^8, rounding it to an integer value. This approach makes the data more manageable and suitable for on-chain use.

To extract the ETHBTC price and process it into an integer, modify the request to the Quex TEE module as follows:

curl -X POST https://quex-api-endpoint/query \
-H "Content-Type: application/json" \
-d '{
      "request": {
        "method": "Get",
        "host": "www.binance.com",
        "path": "/api/v3/ticker/price",
        "headers": [],
        "parameters": []
      },
      "patch": null,
      "filter": ".[] | select(.symbol == \"ETHBTC\") | (.price | tonumber * 100000000 | floor)",
      "schema": "int256"
    }'

• The JQ filter specified in the "filter" parameter: .[] | select(.symbol == "ETHBTC") | (.price | tonumber * 100000000 | floor) performs the following steps:

  • Selects the ETHBTC price from the JSON array.

  • Converts the price to a number.

  • Multiplies it by 10^8 and rounds down to an integer.

• The "schema": "int256" indicates that the processed result will be returned as an integer value.

The certified response will be returned in the following format:

   {
  "signature": {
    "r": "0x...",
    "s": "0x...",
    "v": 27
  },
  "data": {
    "timestamp": 1696523461,
    "feedID": "0xabc123...",
    "value": 3914000
  }
}

The value field now contains the extracted ETHBTC price, multiplied by 10^8 to make it suitable for on-chain use. Note that only the final number is available on-chain, omitting all the intermediate steps such as making the request to Binance and processing the result. However, all these steps are encoded within the feedID and are secured with the signature, which is generated within the TEE module, preventing any possibility of manipulating the result.