AgentBadge — Agent Marketplace on Arc

Trust & settlement layer for agentic economic activity. Agents discover paid services, pay per-request in USDC via x402 on Arc Mainnet, receive NFT access passes, and earn publicly verifiable on-chain attestations.

Live: agentbadge.xyz · Article: We deployed AgentBadge to Arc Mainnet · Full feature docs: FEATURES.md

What is this?

AgentBadge is a marketplace where AI agents are the customers. Sellers (services, APIs, data feeds) publish priced endpoints; buyers (agents, bots, humans) pay per request in USDC — no accounts, no API keys, no subscription forms. Payment is the authorization: settle a USDC transfer on Arc and an NFT access pass is minted to your wallet.

Who it's for:

• Service/API owners — monetize endpoints for agent consumers in minutes; set a USDC price, get a ServicePass-gated route.
• Agent builders — pay per-request for market data, scans, and attestations without signup flows or credit cards.
• The agent economy — every interaction leaves an on-chain receipt: payments, reputation feedback, attestations.

How the marketplace works:

1. A client hits a paid endpoint → gets 402 Payment Required with payment requirements (amount, USDC asset, recipient, network eip155:5042).
2. The client signs an EIP-3009 transferWithAuthorization — gasless, signature only.
3. The server verifies and settles the authorization on Arc via the eip3009-client-broadcast scheme.
4. On settlement, a ServicePass NFT is minted (time-boxed access) and the request is served. Subsequent calls check hasAccess on-chain.
5. Readiness scans additionally write ERC-8004 reputation feedback + memo — a publicly verifiable attestation of what was scanned and scored.

Architecture

flowchart TD
    A[Client agent / human] -->|HTTPS| B[Hono server<br/>agentbadge.xyz]
    B --> C{bstock-freemium gate}
    C -->|free tier / valid pass| D[API resource]
    C -->|no access| E[402 + payment requirements]
    E -->|PAYMENT-SIGNATURE| F[Arc facilitator]
    F -->|verify + settle| G[Arc Mainnet<br/>USDC EIP-3009]
    F -->|on success| H[MarketplacePassNFT<br/>mintServicePass]
    H --> D
    D -->|scan results| I[ERC-8004<br/>reputation + memo]

Agent ↔ platform interaction

sequenceDiagram
    autonumber
    participant A as Agent
    participant S as Paid endpoint
    participant G as x402 gate
    participant F as Facilitator
    participant C as Arc Mainnet
    participant N as ServicePass NFT

    A->>S: Request (no payment)
    S->>G: Check free bucket / hasAccess
    G-->>A: 402 + requirements ($5 USDC, eip155:5042)
    A->>A: Sign EIP-3009 transferWithAuthorization
    A->>S: Retry + PAYMENT-SIGNATURE
    S->>F: verify + settle
    F->>C: Broadcast authorization (gasless)
    C-->>F: tx confirmed
    F->>N: mintServicePass(payer, serviceId, 30d)
    N-->>F: minted
    S-->>A: 200 + PAYMENT-RESPONSE + data
    Note over A,N: Next requests pass hasAccess —<br/>no payment until pass expires

Live on Arc Mainnet (chainId 5042)

Not a testnet demo — every link resolves on the live explorer.

... View full README on GitHub