[#IsStandardTx]
= IsStandardTx
:mrdocs:

Check for standard transaction types

== Synopsis

Declared in `<policy/policy.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
IsStandardTx(
    xref:CTransaction.adoc[CTransaction] const& tx,
    std::optional<unsigned int> const& max_datacarrier_bytes,
    bool permit_bare_multisig,
    xref:CFeeRate.adoc[CFeeRate] const& dust_relay_fee,
    std::string& reason);
----

== Return Value

True if all outputs (scriptPubKeys) use only standard transaction forms

== Parameters

[cols="1,4"]
|===
| Name| Description
| *tx*
| Transaction to check.
| *max_datacarrier_bytes*
| Maximum allowed size of OP_RETURN data, if any.
| *permit_bare_multisig*
| Whether bare multisig outputs are treated as standard.
| *dust_relay_fee*
| Fee rate used to define dust.
| *reason*
| Set to a description of the first non‐standard feature found.
|===


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