Trim trailing zeroes off a number extracted by jq

Pass the price through tonumber:

curl -sS 'https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT' |
jq -r '.price | tonumber'

This would convert the price from a string to a number, removing the trailing zeros. See the manual for jq.

If you don't mind using a Bash builtin, printf might be the way to go:

curl -sS https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT | jq -r '.price' | xargs printf '%.2f'

This way you will keep the two trailing digits and get a rounding done as well.

Awk is an option also

curl -sS https://api.binance.com/api/v1/ticker/price?symbol=BTCUSDT | jq -r '.price'  | awk '{printf "%.2f\n", $1}'

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