Octopus Energy in the UK has a tariff that charges half-hourly rates. They also offer an API to interrogate current pricing and usage and encourage their custom

Octopus Energy in the UK has a tariff that charges half-hourly rates. They also offer an API to interrogate current pricing and usage and encourage their customers - including domestic users - to take advantage of it: https://developer.octopus.energy/docs/api/ https://developer.octopus.energy/docs/api/