The minimum stake is usually £/€ 0.10. Nevertheless this can change according to the market.
When you confirm your bet in your betslip, you will receive an error message if your stake is too low.
In Horse Racing, the minimum stake to avail of the Watch Live feature is £/€ 1.00 for French, UAE, Germany, Mauritian and Latin American racing. This can be in the form of a £/€1.00 single or £/€0.50 each-way bet. For UK, Ireland, US, RSA and India horse racing, races are free to watch as long as you have a funded account.