> ## Documentation Index > Fetch the complete documentation index at: https://docs.aegisintent.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Glossary > Key terms and definitions used throughout the Aegis documentation ## Terms | Term | Definition | | ------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Agent** | An autonomous program, AI model, or service that interacts with the Aegis API. Each agent has a unique email, wallet, and policy configuration. | | **Arc Network** | A Circle backed EVM-compatible blockchain where USDC is the native gas token. Aegis creates agent wallets on Arc. | | **aUSDC** | Aegis USDC — yield-bearing share tokens received when an agent deposits USDC into the Aegis Yield Vault. The value of aUSDC appreciates as yield is injected into the vault. | | **Bearer Token** | The API authentication credential issued during `/v1/connect/complete`. Prefixed with `aegis_live_`. | | **CCTP** | Circle Cross-Chain Transfer Protocol. Used by Aegis to bridge USDC between supported blockchain networks. | | **Circuit Breaker** | A resilience pattern used in Aegis service calls. After repeated failures to an external service, the circuit breaker temporarily blocks requests to prevent cascading failures. | | **Connect Challenge** | The email based OTP verification flow used to register agents and issue API tokens. | | **DCA (Dollar-Cost Averaging)** | A wealth engine strategy that executes recurring token purchases at fixed intervals. The Wealth Sentinel processes DCA schedules automatically. | | **DCW** | Developer Controlled Wallet. Circle's managed wallet infrastructure where private keys are stored in HSM-backed secure enclaves. | | **Dual-Header Auth** | Aegis's authentication scheme requiring both `Authorization: Bearer ` and `X-Aegis-Email: ` headers on every request. | | **EOA** | Externally Owned Account. The type of wallet Aegis provisions for agents — a standard EVM address controlled by a private key (managed by Circle). | | **EURC** | EUR Coin. A euro backed stablecoin issued by Circle. Supported as a balance token on Arc Testnet. | | **Gas Abstraction** | On the Arc Network, USDC is the gas token. Agents don't need to hold ETH or any other token to pay for transaction fees. | | **Idempotency Key** | A unique UUID v4 sent with financial actions to prevent duplicate execution on retries. | | **Limit Order** | A wealth engine intent that registers a conditional swap to be executed automatically when a target price is reached. Monitored by the Wealth Sentinel. | | **Marketplace** | The Circle Discovery API integrated into Aegis, providing a catalog of x402-compatible paid API services. | | **Multi-Yield** | An allocation strategy that splits a single USDC deposit across multiple yield protocols (Aegis Vault and Synthra V3) in a single atomic action. | | **Nonce** | A monotonically increasing counter per agent. Must be included in financial action requests to prevent replay attacks. | | **OTP** | One-Time Password. A 6-character hex code sent to the agent's email during onboarding. Valid for 10 minutes. | | **Policy Engine** | The spending limit enforcement layer that checks every financial action against per-transaction, daily, weekly, and monthly caps. | | **Sliding Window Rate Limit** | The rate limiting algorithm used by Aegis. Requests are counted in a rolling time window rather than fixed intervals. | | **Synthra V3** | A Uniswap V3-style concentrated liquidity AMM deployed on Arc Testnet. Aegis integrates with Synthra for high-capital-efficiency yield generation via tight price range liquidity positions. | | **USDC** | USD Coin. A fully backed US dollar stablecoin issued by Circle. The primary currency used in Aegis for all financial actions. | | **Wealth Sentinel** | An autonomous background process that runs every 5 minutes, scanning and executing pending limit orders and DCA schedules when conditions are met. | | **x402** | An HTTP-based micropayment protocol where services respond with `402 Payment Required` and payment instructions. Aegis handles the negotiation and payment automatically. | | **Audit Log** | An append only record of every financial action attempted by an agent, including successes, failures, and policy rejections. | | **Yield Distributor** | A background cron process that injects real USDC yield into the Aegis Vault contract hourly, driving up the `pricePerShare` for all depositors. |