Permit2 is a next‑generation token approval standard originally pioneered in the broader DeFi ecosystem (e.g., Uniswap’s Universal Router & Permit2 suite).
It lets users grant token allowances once via a signed permit, replacing the old model where every DEX needed a separate on‑chain approval transaction each requiring TRON energy or gas and extra steps.
Permit2 uses signature‑based approvals and allowances with expiry limits, improving efficiency and control.
How SUN.io Uses Permit2
SUN.io’s Smart Router upgrade officially integrates Permit2 alongside its Universal Router on TRON.
This means users can:
• Approve tokens one time: After signing a Permit2 authorisation once, you don’t need repeat approvals for subsequent swaps across multiple pools
• Reduce authorisation costs: Fewer approval transactions mean lower energy costs on TRON, speeding up trades and reducing friction.
• More efficient routing: Together with the Universal Router, SUN.io can execute optimal multi‑pool swaps in one transaction, simplifying the UX for complex trades.
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User Experience Benefits
✔ Faster, simpler approvals
Users don’t have to approve each token for each contract every time a major UX pain point in traditional DeFi. This streamlines swaps, LP staking, and other actions with fewer steps.
✔ Lower transaction overhead
Fewer on‑chain approval transactions mean less energy is consumed for authorisations translating into cheaper and more predictable costs for SUN.io users.
✔ Better multi‑pool interactions
Combined with the Universal Router, Permit2 enables cross‑pool swap composition in one go, giving users smoother and more capital‑efficient trading.
✔ Increased onboarding friendliness
By simplifying token approval mechanics, Permit2 lowers the barrier for newer traders who might otherwise be confused by repeated on‑chain approvals and energy calculations.
@OfficialSUNio @Justin Sun孙宇晨 #TRONEcoStar #Tron