> ## Documentation Index
> Fetch the complete documentation index at: https://docs.celo.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Fee Abstraction

Fee abstraction is one of Celo's core protocol features. It allows users to pay gas fees in ERC20 tokens — like USDC, USDT, or Mento stablecoins — instead of needing to hold the native CELO token.

## Why Fee Abstraction Matters

On most EVM chains, users must hold the native token to pay for gas. This creates friction: a user who receives USDC on Celo can't send it anywhere without first acquiring CELO. Fee abstraction removes this barrier entirely.

With fee abstraction, a user holding only USDC can send transactions, interact with contracts, and pay gas — all in USDC. No bridging, no swaps, no extra steps. This is especially valuable for:

* **Onboarding new users** who receive stablecoins but don't know about gas tokens
* **Payment applications** where users transact in a single currency end-to-end
* **AI agents** that operate autonomously with a single token balance

## How It Works

Fee abstraction is built into the Celo protocol at the node level — it is not a paymaster or relayer. When a transaction includes a `feeCurrency` field, the Celo blockchain:

1. Calls `debitGasFees` on the fee currency contract to reserve the maximum gas cost
2. Executes the transaction normally
3. Calls `creditGasFees` to refund unused gas and distribute fees to block producers

This means fee abstraction works with any externally owned account (EOA). No smart contract wallets, no relayers, no extra infrastructure needed.

To use an alternate fee currency, set its token or adapter address as the `feeCurrency` property on the transaction object.

For implementation details, see [Using Fee Abstraction](/build-on-celo/fee-abstraction/using-fee-abstraction). To add a new fee currency to the protocol, see [Adding Fee Currencies](/build-on-celo/fee-abstraction/add-fee-currency).

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## Related

* [Fee Abstraction for AI Agents](/build-on-celo/build-with-ai/overview#fee-abstraction-for-agents) — Using fee abstraction in autonomous agent backends
* [x402: Agent Payments](/build-on-celo/build-with-ai/x402) — HTTP-native stablecoin payments for agents
* [Using Fee Abstraction](/build-on-celo/fee-abstraction/using-fee-abstraction) — How to pay gas with alternate fee currencies in your transactions
* [Adding Fee Currencies](/build-on-celo/fee-abstraction/add-fee-currency) — How to implement and register a new fee currency