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POST
Build UNSIGNED transaction(s) to fund a leg — sign with your own key/HSM, then broadcast

Authorizations

Authorization
string
header
required

An API key (hk_live_… / hk_test_…) with read/taker/maker scopes.

Path Parameters

id
string
required
leg
enum<string>
required
Available options:
a,
b

Response

chain-specific signing material (EVM txs / BTC pay-to / TRON txs / Solana transaction, base64)

The response is of type object.