A bikie accused of orchestrating the fatal shooting of a rival gang member and encouraging the murder of two other people allegedly underpaid his contract killer.

David James Pye, 43, has pleaded not guilty to six charges, including the murder of senior Rebels bikie Nick Martin, who was shot dead at Perth Motorplex on December 12, 2020.

Pye, who was an outlaw motorcycle gang member, organised and paid for Martin to be shot in a sniper-style attack, prosecutor Justin Whalley SC told the Western Australian Supreme Court during his opening statement on Wednesday.

"The accused said words to the effect of, well, you do it, and offered (the shooter) $150,000," he said.

"(He) explained the history of antagonism and disagreement between himself and Nick Martin, including the belief that Nick M

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