“Gas fees must be paid in the network's native token ONLY”
An underwritten rule that is becoming the biggest hurdle for cross-chain apps adoption.
Time to flip the script with Universal Fee Abstraction.
If a blockchain can be universal, gas fees should be as well!
Legacy gas mechanisms limit both users and developers.
They break UX, fragment liquidity, and slow adoption.
Push Chain solves this with Universal Fee Abstraction.👇
What if you could pay for gas with any token you already hold?
USDC on @ethereum? ✅
SOL on @Solana? ✅
ETH on any chain? ✅
No bridges. No swaps. No gas token hunting.
Pay in what you have. From wherever you are. With one signature.
Universal Fee Abstraction happens in 3 phases:
1️⃣ Gas Estimation & Conversion
2️⃣ Fee Lock
3️⃣ Attribution
All automatic. All in one signature.
Let’s break down each phase👇
⚖️ Phase 1 - Gas Estimation & Conversion
When you sign a txn from Solana, the Push SDK:
1️⃣ Estimates gas in $ PC (Push Chain’s native token)
2️⃣ Converts that cost into your origin chain's native token
It speaks both languages:
Your origin chain's token (eg, SOL) & Push Chain ($ PC).
You pay in SOL. Push Chain receives PC.
Magic happens in between ✨
🔐 Phase 2 - Fee Lock
Now that the SDK knows your exact fee, it locks that amount on your origin chain through a contract called the Universal Gateway.
These gateways exist on every source chain (Solana, Ethereum, etc), which:
> Receives your gas fees (eg, SOL)
> Locks it securely
> Signals the lock event
> Push Chain validators can now verify this lock
Your fee lock + intended transaction (swap, stake, etc.) are wrapped in ONE signature.
You sign once. Both happen atomically.
If the txn fails → the fee lock reverts → you don't lose funds. ⚙️
🤝 Phase 3 - Attribution (Part 1: Synthetic Tokens)
Validators verify your locked SOL on Solana.
But Push Chain needs $ PC, not SOL.
So they mint synthetic tokens called pSOL.
1 SOL locked → 1 pSOL minted.
Recap on universal validators:
Why synthetic tokens?
Think of pSOL as a receipt: proof of locked assets.
> 1 SOL locked → 1 pSOL minted
> 1 ETH locked → 1 pETH minted
> 1 POL locked → 1 pPOL minted
It works for any token, from any chain, that’s universal liquidity. 🌍
Validators then swap your pSOL → $ PC using on-chain liquidity pools (AMMs).
Your Universal Executor Account (UEA) now holds $ PC to:
✅ Pay for gas
✅ Execute the txn
✅ Handle future ops
All without you ever touching $ PC.
Want to pay gas in USDC instead of SOL or ETH?
No problem.
The Universal Gateway auto-converts it:
1️⃣ Receives USDC
2️⃣ Swaps → native token (eg. ETH)
3️⃣ Locks it
4️⃣ Rest of the flow continues
Any token. Any chain. One UX.
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