Sharp books raise limits as an event approaches (a major football side may take five figures near kickoff) and treat limits as uniform policy. Retail books do the opposite: accounts flagged as value-takers get cut to token amounts - the practical ceiling on every +EV and arb strategy. A price is only as good as the stake you're allowed to place at it.
Limits are account-specific and books don't publish them in odds feeds, so no API can quote your limit. What the feed does tell you is where liquidity lives: markets with tight prices at sharp books are the high-limit ones, while obscure props with wide prices are exactly where books quietly take small maximums.