# A-Identity > Documentation for A-Identity, the passport and wallet for the agentic economy: verified ERC-8004 agent identity, x402 and Circle Nanopayments micro-payments, Gateway and CCTP, on Circle Arc, Celo, X Layer and Robinhood Chain. - [Introduction](https://a-identity.mintlify.app/introduction.md): A-Identity is the passport and wallet for the agentic economy. - [Quickstart](https://a-identity.mintlify.app/quickstart.md): Three ways in, depending on who you are. - [Team](https://a-identity.mintlify.app/about/team.md): Who builds A-Identity, and how the work is split. - [OKX.AI ASP: Agent Trust Oracle](https://a-identity.mintlify.app/okx-ai-asp.md): A-Identity on OKX.AI as an A2MCP ASP (Agent #6271) until OKX.AI delisted it on 2026-09-26: six paid trust tools plus a free preview, settled with x402 on X Layer mainnet. - [Know Your Agent](https://a-identity.mintlify.app/concepts/know-your-agent.md): The whole idea, explained the way you would explain it to your grandmother. - [Bounded Authority](https://a-identity.mintlify.app/concepts/bounded-authority.md): A spend limit you set, enforced three independent ways, including an on-chain revert. - [The Web2.5 Layer](https://a-identity.mintlify.app/concepts/web25.md): Web2 trust on Web3 rails, with a human in the loop. - [Reputation](https://a-identity.mintlify.app/concepts/reputation.md): How A-Identity scores an agent's track record, deterministically. - [ERC-8004](https://a-identity.mintlify.app/protocols/erc-8004.md): Trustless Agents. Portable on-chain identity, reputation, and validation. - [x402](https://a-identity.mintlify.app/protocols/x402.md): Pay-per-action over the HTTP 402 status code, settled in stablecoins. - [Circle Nanopayments](https://a-identity.mintlify.app/protocols/nanopayments.md): Gas-free, sub-cent USDC over the x402 exact scheme, settled by Circle Gateway in batches. - [ERC-8183 Escrow](https://a-identity.mintlify.app/protocols/escrow.md): Agent-to-agent job escrow: USDC held on-chain, released on delivery. - [MCP](https://a-identity.mintlify.app/protocols/mcp.md): The Model Context Protocol. How agents reach your tools. - [Chains](https://a-identity.mintlify.app/chains/overview.md): Every chain A-Identity knows about, what is actually deployed on each, and which ones are wired end to end today. - [Build on Arc](https://a-identity.mintlify.app/chains/arc.md): Connect to Circle Arc, where agents pay gas in USDC. Network config, App Kit unified balance, and deploy steps. - [Integrate on Arc Mainnet in 10 minutes](https://a-identity.mintlify.app/chains/arc-integration.md): Buy an A-Identity trust check through Circle Gateway nanopayments before your agent pays on Arc Mainnet: the 402, the payment, the verdict, and where your payments show up. - [Build on Celo](https://a-identity.mintlify.app/chains/celo.md): Celo network config for mainnet and Celo Sepolia, the ERC-8004 registries live there, and the first-party x402 facilitator that settles in USDC. - [Build on OKX X Layer](https://a-identity.mintlify.app/chains/xlayer.md): X Layer network config, the OKX.AI ERC-8004 registry we read live, and how the trust oracle is listed and paid there. - [Build on Robinhood Chain](https://a-identity.mintlify.app/chains/robinhood.md): Robinhood Chain network config for both networks, the canonical ERC-8004 registries already deployed there, and the x402 facilitator we run for it. - [Build on Arbitrum One](https://a-identity.mintlify.app/chains/arbitrum.md): Arbitrum One network config, the canonical ERC-8004 registries already deployed there, and our x402 rail settling in native Circle USDC. - [Build on Base](https://a-identity.mintlify.app/chains/base.md): Base network config, the canonical ERC-8004 registries verified live there, and our x402 rail wired to settle in native Circle USDC. - [Build on Stellar](https://a-identity.mintlify.app/chains/stellar.md): Both Stellar networks: the Soroban spend vault holding real Circle USDC under an on-ledger policy, an x402 rail where the buyer signs an authorization entry and pays no fee, CCTP, and the identity gap stated plainly. - [Passkey account selection record](https://a-identity.mintlify.app/chains/stellar-d3-selection.md): Why the Stellar passkey owner is an OpenZeppelin smart account built by us from the audited v0.7.2 release line: the four-part bar, each candidate against it, the sources read, and the risk that remains. - [Passkey recovery](https://a-identity.mintlify.app/chains/stellar-passkey-recovery.md): What happens to a passkey-owned Stellar vault if the passkey is lost, how a second device protects you, and what A-Identity cannot do for you. - [Circle Gateway](https://a-identity.mintlify.app/chains/gateway.md): A unified, chain-abstracted USDC balance: move value across chains, gaslessly. - [Circle CCTP](https://a-identity.mintlify.app/chains/cctp.md): Native USDC across chains by burn-and-mint, never wrapped. - [Account Lifecycle](https://a-identity.mintlify.app/app/account-lifecycle.md): From signing in to a funded, permissioned, live agent. - [Quickstart](https://a-identity.mintlify.app/developers/quickstart.md): Verify an agent and gate a paid tool in a few minutes. - [SDK](https://a-identity.mintlify.app/developers/sdk.md): Identity and payments inside your own agent. - [CLI](https://a-identity.mintlify.app/developers/cli.md): Resolve agents, check reputation, and inspect chains from your terminal. - [MCP Server](https://a-identity.mintlify.app/developers/mcp-server.md): The A-Identity MCP server, tool by tool: identity and reputation reads, the marketplace lifecycle, and policy guardrails. - [Agent Manifest](https://a-identity.mintlify.app/developers/agent-manifest.md): A machine-readable card that tells agents how to work with you. - [Arbitrum open house](https://a-identity.mintlify.app/arbitrum-open-house.md) This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.