Swansea City spent £335,241 on agents last season, according to the Football League's agents fees report.
It marks a huge rise on the £70,000 they spent the year before which was their first season in the Championship.
Cardiff City spent £313,000, which was a drop of almost £220,000 on the previous year.
A total of £10,131,314 was spent on agents by Championship clubs in 205 out of 778 transfers made - an increase of almost £1m, but with 449 fewer deals.
Middlesbrough spent the most on agents with £1,464,200, while Scunthorpe spent the least, just £33,300.
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