curl --request POST \
  --url https://api.kas.fyi/v1/rpc/submitTransaction \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "transaction": {
    "version": 0,
    "inputs": [
      {
        "previousOutpoint": {
          "transactionId": "fa99f98b8e9b0758100d181eccb35a4c053b8265eccb5a89aadd794e087d9820",
          "index": 1
        },
        "signatureScript": "4123c94e322fd98ce4ba8b2e33b47f2984a2f741ecfea6fb48eb90d209a46b9d58639888a1575a717cb243b006edd720a7153e9a7e63f4539958d0a44eea8bfa9f01",
        "sequence": 0,
        "sigOpCount": 1
      }
    ],
    "outputs": [
      {
        "value": "100000",
        "scriptPublicKey": {
          "version": 0,
          "script": "208b42bec57f9a538f740b067f947a5b29e04043218a37ff1fa7fb5ee850fd3fd3ac"
        }
      }
    ],
    "lockTime": 0,
    "subnetworkId": "0000000000000000000000000000000000000000",
    "gas": "0",
    "payload": ""
  },
  "allowOrphan": false
}'

{
  "transactionId": "34e9538fd3225652553930657c3d767d5ccab0fcd545038a69c202e45929dcd6"
}