testmempoolaccept - Validation Cloud

Returns result of mempool acceptance tests indicating if raw transaction (serialized, hex-encoded) would be accepted by mempool. This checks if the transaction violates the consensus or policy rules. This method will use 10 Compute Units.

Reference: Here

Parameters

rawtxs - json array, required An array of hex strings of raw transactions. Length must be one for now.

[
  "rawtx",    (string)
  ...
]

maxfeerate - numeric or string, optional, default=0.10 Reject transactions whose fee rate is higher than the specified value, expressed in BTC/kB

Returns

[                               (json array) The result of the mempool acceptance test for each raw transaction in the input array.
                                Length is exactly one for now.
  {                             (json object)
    "txid" : "hex",             (string) The transaction hash in hex
    "allowed" : true|false,     (boolean) If the mempool allows this tx to be inserted
    "vsize" : n,                (numeric) Virtual transaction size as defined in BIP 141. This is different from actual serialized size for witness transactions as witness data is discounted (only present when 'allowed' is true)
    "fees" : {                  (json object) Transaction fees (only present if 'allowed' is true)
      "base" : n                (numeric) transaction fee in BTC
    },
    "reject-reason" : "str"     (string) Rejection string (only present when 'allowed' is false)
  },
  ...
]