> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gx402.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Glossary

> A glossary of terms related to the Gx402 SDK and the technologies it uses.

* **x402**: Payment protocol leveraging HTTP 402 status code for machine-native transactions.
* **EIP-3009**: Ethereum standard enabling gasless token transfers via signed authorizations.
* **Facilitator**: Service that verifies payments and settles on-chain transactions.
* **EVM**: Ethereum Virtual Machine - runtime environment for smart contracts.
* **Non-EVM**: Blockchains not using Ethereum's architecture (Solana, Sui, Aptos).
* **L2 (Layer 2)**: Scaling solution built on top of base blockchains (Base, Arbitrum, Optimism).
* **USDC**: USD Coin - stablecoin pegged 1:1 to US dollar.
* **Embedded Wallet**: Crypto wallet integrated directly into apps (no external download).
* **MPC**: Multi-Party Computation - cryptographic key management technique.
* **Onramp**: Service converting fiat currency to cryptocurrency.
* **Offramp**: Service converting cryptocurrency to fiat currency.
* **GPV**: Gross Payment Volume - total transaction value processed.
* **Escrow**: Funds held by third party until conditions are met.