PharosPay

PharosPay gives an AI agent a wallet on Pharos and a payment record that lives on-chain. The agent pays for things over x402 (gasless for the agent), and every payment is settled by a contract that keeps a reputation score, a daily streak, and a leaderboard rank. There is a referral that hands both sides some test pUSD.

Plenty of agent skills read balances or move tokens. The thing that's new here is the reputation: a way to see, on-chain, which agents actually pay and keep paying.

Built for the Skill-to-Agent Dual Cascade Hackathon (Pharos and Anvita Flow), Phase 1.

Why

Pharos is built for an economy where agents transact, and on-chain payments are the first thing it lists in that mission. Anvita Flow's pitch is trusted value exchange between machines, using the x402 micropayment standard. PharosPay makes Pharos a place x402 actually settles: it ships the missing pieces (an EIP-3009 stablecoin and a settlement and reputation ledger), a reusable skill that gives an agent a wallet, a small provider middleware, a real paid service, and a leaderboard that makes the activity visible.

We checked the other Pharos skills. There are skills for wallet health, audits, token launches, RWA, and a couple for x402 payments. None of them give an agent a reputation it earns by paying. That is the part we lead with.

What's in here

 Agent (MCP host: Claude or OpenAI)
        |  pay_fetch(url)                    +------------------------------+
        v                                    |  Skill (MCP)                 |
   +---------+   402 + terms                 |  pay_fetch, get_balance      |
   | Provider |<--------------------------   |  set_budget (guardrails)     |
   | x402     |   X-PAYMENT (EIP-3009 sig)   |  list_receipts, get_reputation|
   | middleware|--------------------------> |  share_receipt, referral     |
   +----+-----+                              +------------------------------+
        | settle()                                   ^ reads reputation
        v                                            |
   +----------------------+   relays    +------------+-----------+
   | PharosPayLedger      |------------>| pUSD (EIP-3009)        |
   | records rep + streak |  transfer   | + faucet + referral    |
   +----------+-----------+  WithAuth   +------------------------+
              | PaymentSettled events
              v
   Leaderboard + shareable cards (Next.js)        Alpha API (a real paid service)

How a payment works

1. The agent calls pay_fetch(url). The resource answers 402 with the terms (asset, who to pay, how much, which network).

2. The skill checks the spending limits (per call, per day, allowed hosts) before it signs.

3. It signs an EIP-3009 TransferWithAuthorization. The agent needs no gas for this.

4. It resends with an X-PAYMENT header. The provider verifies the signature and settles through PharosPayLedger, which moves the pUSD and updates reputation and streak in one transaction.

5. The skill records a receipt. The settlement shows up on PharosScan, and the agent moves on the leaderboard.

Quickstart

// MCP client config
{
  "mcpServers": {
    "pharospay": {
      "command": "npx",
      "args": ["pharospay-skill"],
      "env": {
        "PHAROSPAY_PRIVATE_KEY": "0xYOUR_AGENT_KEY",
        "PHAROS_CHAIN_ID": "688689",
        "PHAROS_RPC_URL": "https://atlantic.dplabs-internal.com"
      }
    }
  }
}

set_budget({ perCallMax: "0.10", dailyCap: "1.0" })
pay_fetch({ url: "https://alpha-api-seven.vercel.app/alpha/wallet/0xabc...", maxAmount: "0.05" })
list_receipts({})
get_reputation({})

Live deployment (Pharos Atlantic testnet, chain id 688689)

• Leaderboard (live): https://leaderboard-five-neon.vercel.app

• Alpha API (live, paid): https://alpha-api-seven.vercel.app

• pUSD: 0x3c37a2a0ebe4683f6242189733b352f05641cb73

• PharosPayLedger: 0x4ce02b05b3fa4e04404cdaea15c1f82be1781ca8

• Example x402 settlement: https://testnet.pharosscan.xyz/tx/0xd95c1836af9e44fe9c5795bbf736548040ae2426742b7dd99572ba21200621c8

• Explorer: https://testnet.pharosscan.xyz

The Alpha API and the leaderboard run locally for now (see each package README). The contracts above are live, and the settlement above is a real x402 payment that raised the paying agent's on-chain reputation.

Run it and check it

pnpm install
cd packages/contracts && forge test     # contracts
pnpm -r test                            # everything else

38 tests across the packages. The integration tests run the whole sign, verify, settle loop on a local anvil chain, so the path is exercised end to end before anything touches the testnet.

The reputation part

Every payment is visible. The leaderboard ranks agents by how much they've paid, how much they've earned, and their streak. Each payment can be turned into a shareable card, and the referral hands out bonus pUSD. You only move up by transacting, so the thing it encourages is the thing Pharos wants: more on-chain payments.

Where this goes next (Phase 2)

An agent that both pays for data through the skill and sells its own analysis through the middleware, earning and spending on Pharos. Phase 1 is the rails. Phase 2 is the agent that runs on them.

Tech

TypeScript, viem, Foundry and Solidity, @modelcontextprotocol/sdk, Hono, Next.js with @vercel/og, x402 over EIP-3009, pnpm workspaces.

License

MIT