With crypto currencies being highly volatile, is there a feature where the transaction amount in crypto say BTC, is valid only if the the value of BTC doesnt breach any of the limits, for example, if i am a trader, I accept payment via Request, but I would like the amount request and the Txn to auto expire if the BTC moves +/- 15% from its Fiat rate at the time of the request.

Keeping same limits both ways, will also protect the buyer, who may not check the appreciation and can actually pay less BTC for the same product or service.