Is there a way to find the price of an asset from the JSON object of a transaction received from a Blockfrost webhook?

Question

I am trying to find the price of an asset from a transaction JSON object that I receive from a Blockfrost webhook in which I track transactions from and to JPG store, the object has all the information about a transaction and the UTxOs but none of them have the price of the asset/assets, is it possible to find it by using one of the properties?

Answer 1

The price of the asset is stored within the datum of the order itself by the jpg.store contract.

Let's take the transaction 8698d938588ca9a93663cb1a9e4478390f374873970ced6d46ae9c4e6ac88723 for example.

To find out more information about this order, we need to find out the Datum of the UTXO that has been spent.

$ curl -s -H 'project_id: token' https://cardano-mainnet.blockfrost.io/api/v0/txs/8698d938588ca9a93663cb1a9e4478390f374873970ced6d46ae9c4e6ac88723/utxos | jq .inputs[].data_hash
null
"e782c5dbe30c01d0dee590e474fa0a92c18fd4ff3f459fb74c8253e4c87ddddd"
null

And here, you can the content of the datum.

$ curl -s -H 'project_id: token' https://cardano-mainnet.blockfrost.io/api/v0/scripts/datum/e782c5dbe30c01d0dee590e474fa0a92c18fd4ff3f459fb74c8253e4c87ddddd | jq 
{
  "json_value": {
    "fields": [
      {
        "bytes": "bf5be2e0d7246b59b89f9ff57dfed904257985ecde6a20fc66cf7b26"
      },
      {
        "int": 680000000
      },
      {
        "bytes": "86ec26a91051e4d42df00b023202e177a0027dca4294a20a0326a116"
      },
      {
        "bytes": "617175616661726d657231303534"
      },
      {
        "bytes": "baaaa8b9a088f04386cb7119ccf686616fc15f81663f58f459d0bf67"
      },
      {
        "int": 50
      }
    ],
    "constructor": 0
  }
}

As you can see, the second field value is the price.