testmempoolaccept JSON-RPC command

testmempoolaccept ["rawtx",...] ( allowhighfees )

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.

See sendrawtransaction call.

Arguments

1. rawtxs           (json array, required) An array of hex strings of raw transactions.
                    Length must be one for now.
     [
       "rawtx",     (string)
       ...
     ]
2. allowhighfees    (boolean, optional, default=false) Allow high fees

Result

[                   (array) The result of the mempool acceptance test for each raw transaction in the input array.
                            Length is exactly one for now.
 {
  "txid"           (string) The transaction hash in hex
  "allowed"        (boolean) If the mempool allows this tx to be inserted
  "reject-reason"  (string) Rejection string (only present when 'allowed' is false)
 }
]

Examples

Create a transaction
> bitcoin-cli createrawtransaction "[{\"txid\" : \"mytxid\",\"vout\":0}]" "{\"myaddress\":0.01}"
Sign the transaction, and get back the hex
> bitcoin-cli signrawtransactionwithwallet "myhex"

Test acceptance of the transaction (signed hex)
> bitcoin-cli testmempoolaccept "signedhex"

As a JSON-RPC call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "testmempoolaccept", "params": [["signedhex"]] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/

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Bitcoin Cash Node Daemon version v23.1.1-f21426b

Documentation on docs.bitcoincashnode.org reflects the current master branch in Git, and may include API changes that are not yet present in the latest release.