DeskCrew: the helpdesk AI agents can pay to use

$ npx try-x402 --dry-run

wallet: 0x18CC7FAda369D574Db51B234FD4705B9a8f02972

  A throwaway wallet was generated for this run.
  To reuse it, save this key somewhere safe and export it next time:

    export X402_KEY=0x<printed once, yours to keep or discard>

  Never put a real wallet key here. This one holds only what you send it.

calling https://deskcrew.io/api/x402/paid/ping with no payment, to read its terms...

server wants 0.02 USDC on base (v1 dialect)
  pay to: 0xB075aA8206D6De88EDEeD0eE4015a1a33D3659D8
  for:    x402 self-hosted settlement demo (paid ping).

DRY RUN. Nothing was paid.

$ curl -s https://deskcrew.io/.well-known/x402

{
  "x402Version": 1,
  "service": "DeskCrew agent API",
  "paymentTerms": {
    "scheme": "exact",
    "network": "base",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0x<platform cold wallet>"
  },
  "acceptedNetworks": [ /* one entry per chain: base, polygon, avalanche, sei, solana */ ],
  "doorUrlPattern": "/api/mcp/{tenantSlug}",
  "manifestUrlPattern": "/api/mcp/{tenantSlug}/manifest",
  "actions": [
    { "name": "draft_support_reply", "tier": "draft", "priceUsd": 0.05,
      "sendsEmail": false, "accessNote": "pay-per-call" }
    /* ...every other tool, each with its tier + price... */
  ]
}

$ curl -si -X POST https://deskcrew.io/api/mcp/deskcrew \
    -H 'content-type: application/json' \
    -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{
          "name":"draft_support_reply",
          "arguments":{"customer_message":"My export has been stuck on processing for an hour."}}}'

HTTP/2 402
content-type: application/json

{
  "x402Version": 1,
  "error": "Payment required for tool 'draft_support_reply'",
  "resource": "POST /api/mcp/deskcrew",
  "accepts": [
    {
      "scheme": "exact",
      "network": "base",
      "maxAmountRequired": "50000",
      "resource": "POST /api/mcp/deskcrew",
      "description": "Paid MCP tool 'draft_support_reply'",
      "mimeType": "application/json",
      "payTo": "0x<platform cold wallet>",
      "maxTimeoutSeconds": 300,
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "outputSchema": { "input": { "type": "http", "method": "POST", "discoverable": true } },
      "extra": { "name": "USD Coin", "version": "2" }
    }
    /* ...one accepts[] entry per enabled chain... */
  ],
  "feeBreakdown": { "platformFee": 0.05, "tenantShare": 0, "allInUsd": 0.05 }
}

# Sign an EIP-3009 transferWithAuthorization for the quoted accept:
# from = your wallet · to = payTo · value = maxAmountRequired ("50000")
# validBefore must be at least 60s ahead; the door rejects shorter windows.
# X-PAYMENT is that payload, base64-encoded:

{
  "x402Version": 1,
  "scheme": "exact",
  "network": "base",
  "payload": {
    "signature": "0x<EIP-712 signature>",
    "authorization": {
      "from": "0x<your wallet>",
      "to": "0x<payTo from the 402>",
      "value": "50000",
      "validAfter": "0",
      "validBefore": "<unix now + 300>",
      "nonce": "0x<32 random bytes>"
    }
  }
}

$ curl -si -X POST https://deskcrew.io/api/mcp/deskcrew \
    -H 'content-type: application/json' \
    -H "X-PAYMENT: $(base64 -w0 payment.json)" \
    -d '<same tools/call body as step 2>'

HTTP/2 200
x-payment-response: <base64 {"success":true,"transaction":"0x...","network":"base","payer":"0x<you>"}>

{ "jsonrpc": "2.0", "id": 1, "result": { "content": [ { "type": "text",
  "text": "{\"draft\":\"Hi, thanks for flagging this...\",\"disclaimer\":\"AI-generated draft. Review before sending\"}" } ] } }

// npm i x402-fetch viem   (x402-fetch = the standard Coinbase x402 client)
import { wrapFetchWithPayment } from 'x402-fetch'
import { privateKeyToAccount } from 'viem/accounts'

const account = privateKeyToAccount(process.env.AGENT_PK as `0x${string}`)
const payFetch = wrapFetchWithPayment(fetch, account) // 402 → sign EIP-3009 → X-PAYMENT retry

const res = await payFetch('https://deskcrew.io/api/mcp/deskcrew', {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'tools/call',
    params: {
      name: 'draft_support_reply',
      arguments: {
        customer_message: 'My export has been stuck on processing for an hour.',
        tone: 'friendly',
      },
    },
  }),
})

const rpc = await res.json()
const { draft, disclaimer } = JSON.parse(rpc.result.content[0].text)