Every energy rental platform prices in SUN, not TRX. So what is a SUN, how does a platform turn one into the number you pay, and why does the same 65k rental cost 1.36 TRX on one site and 5.30 TRX on another as this page loads?

What is a SUN?

SUN is TRON's smallest unit — 1 TRX = 1,000,000 SUN. It is the atomic denomination used for all on-chain arithmetic. When you rent energy you are not really paying "2.34 TRX"; you are paying 2,340,000 SUN. A platform expresses its price as a SUN rate: the number of SUN charged per unit of energy.

The formula is the whole of it:

Price in TRX = (Energy × SUN rate) ÷ 1,000,000

Here is a worked example you can check rather than take on trust. Tronify's public configuration endpoint publishes an hourly rate of 73 SUN. 65,000 × 73 ÷ 1,000,000 = 4.745 TRX — and 4.75 TRX is exactly what the board shows for Tronify at 65k/1h. Move that rate to 42 SUN and the same rental costs 2.73 TRX. A handful of SUN either way is most of your price.

The rate every platform has to beat

The benchmark is not another platform, it is the chain itself. TRON proposal #104 set the energy unit price at 100 SUN in August 2025, down from 210. That is what you pay when you rent nothing: 65,000 × 100 ÷ 1,000,000 = 6.5 TRX burned for an ordinary USDT transfer, and 13.1 TRX for a 131,000-energy one. Every quote on the board is a bid to undercut those two numbers.

How platforms set their rates

There is no central SUN rate; each platform picks its own. From the outside we can see the result rather than the reasoning, so it is worth separating what this board actually knows from what it doesn't.

What the board can see

The spread persists inside a single scan, and it is not a rounding error: the mean 65k/1h quote right now is 2.93 TRX, sitting well above the cheapest, which today is NETTS. Whatever is supposed to make twenty-two sellers of an identical commodity converge on one price has not happened yet.

We can also see the pricing model, because platforms advertise it. Some quote a fixed rate and change it when they choose to. TronMax and Brutus run a marketplace with bid and ask. Others sell per transfer at a flat price — MeFree advertises 3 TRX per 65,000 energy for one hour and prices nothing else, so every other MeFree cell on our board is our own estimate.

What the board cannot see

We do not know any platform's energy pool or how much of it is in use, and we do not track the TRX/USD price. Nor do we have the history to speak for the past.

The archive is still filling.

So when you read that rates "typically" climb with pool utilisation, or fall when TRX appreciates, ask who has the series to know that. We don't, and we would rather say so than dress a plausible story up as a finding.

Reading the board without fooling yourself

Two habits worth having here. Roughly half the price cells on the board are estimates derived from market ratios rather than scraped quotes; they are prefixed “≈” and say so on hover, and they are a guide, not an offer. And a platform showing no numbers is not a cheap platform — it is one our scraper could not read on this pass.

Which model is cheapest?

Less than you would hope rides on the model. A fixed-rate platform is predictable, which is worth something if you are budgeting ahead; a marketplace can move under you in either direction. But the tidy rule that "API platforms charge a premium for automation" is contradicted by the board as it stands — platforms with an API sit at both ends of today's range.

So the practical advice is dull: sort by price, check whether the cell you are reading is a quote or an estimate, and check the platform's published order minimum before you commit. Our comparison tool does the first two for you, and each platform's review page carries the third.