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  • 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.