JustLend energy rental: what it really costs

JustLend DAO rents energy from the biggest pool on TRON, but each rental is two contract calls you pay for — renting and returning — plus a day of rent locked as a deposit. Its real price depends on how much you rent, for how long, and the hour you rent at.

Set the amount and the term: the calculator adds the rent, the charge for energy used, both contract calls and the deposit, at live figures.

Energy to rent

Term

How the receiver spends it

Contract owner's energy

Now: available, 97.1 % of today's limit used.

Call energy paid by

Energy you can use: 67,708 (1.04× the amount)
Rent for the term: 0.16 TRX
Charge for energy used: 2.93 TRX
Rent call: 6,931 energy + 384 bandwidth · 1.08 TRX
Return call: 7,413 energy + 378 bandwidth · 1.12 TRX

Total

5.29 TRX

78.1 SUN per energy used

~~6.77 TRX~~ burning TRX for the same energy

TEnergy 1 h: 1.91 TRX for the same amount with the 5 % service fee, nothing to return

Deposit locked until the return: 4.07 TRX

Rate: the JustLend contract, live. A rental returned with its energy still used up keeps 0.75 day of rent; partly recovered, pro rata. The deposit is one extra day of rent and comes back at the return. Return on time: until it is returned the rent keeps accruing, and once the deposit runs out anyone can liquidate the rental. Call energy: medians of mainnet calls.

Why amount and term change the price

The two contract calls cost about the same for any rental — around 14,000 energy and 760 bandwidth while the contract owner still has energy, about 2.2 TRX burned. Spread over 65,000 energy that is 34 SUN per unit; over 10 million it is next to nothing. The term works the other way: a rental returned with its energy used is charged 0.75 day on top, so a one-hour rental is billed like 19 hours.

The term also changes how much energy you actually get. Used energy recovers over 24 hours while the rental lasts, so a receiver that keeps spending gets the amount once at the start and again for every day held: about 2× in one day, 4× in three, 31× in thirty. That is also why sellers price a day well above an hour: a one-day rental can be spent twice. The prices per energy used below count that recovery.

Amount	Calls, SUN per energy	1 hour	1 day
65,000	33.8	78.1	69.5
131,000	16.8	61.8	61.0
1,000,000	2.2	47.8	53.7
10,000,000	0.2	45.9	52.7

SUN per energy used, live: the receiver spends as it recovers (1 hour: 1.04× the amount, 1 day: 2×), the owner has energy, calls paid by burning TRX. Burning TRX instead: 100 SUN.

The owner's energy runs out at the peak

The JustLend contract pays 90 % of every call's energy from its owner's account, up to 90,000 per call. The owner holds no stake of its own: all its energy is one delegation, about 59.75 million a day, and nobody tops it up. On weekdays it runs out in the afternoon (UTC) — exactly when energy is scarce everywhere — and callers pay the whole call, about 70,000 energy: a 65,000-energy rental then costs about 15 TRX more.

Weekdays of 2026-09-23 – 2026-10-07, 29,822 calls. Red: more than a quarter.

Who rents on JustLend

Pools. Over three days to 2026-10-07, 151 addresses called the rental; the largest takes about 60 million energy per call and pays for the call with its own staked energy. Retail-sized renters, with three calls or fewer, were 1.6 % of the energy rented.

When JustLend makes sense

Large amounts: from about 1 million energy the calls stop mattering.
Outside the weekday afternoon (UTC), while the owner still pays 90 % of the calls.
With your own staked energy for the calls and a reliable return on time.

Buy energy → All providers

FAQ

Why does a JustLend rental cost more than the price on the board?

The board shows the rent with the 0.75-day charge for used energy. On top of it the renter pays two contract calls — renting and returning — in energy and bandwidth, and locks a day of rent as a deposit until the return.

Who pays the energy of the contract calls?

The JustLend contract's owner pays 90 % of each call's energy, up to 90,000 per call, while its own energy lasts; the renter pays the rest. On weekday afternoons (UTC) the owner's energy often runs out, and the renter pays the whole call.

What happens if I do not return the rental?

Rent keeps accruing against the deposit. When the deposit runs out, anyone can liquidate the rental for a bounty, so a JustLend rental has to be returned on time.