Zambo

[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "extra": {
          "name": "USD Coin",
          "types": {
            "TransferWithAuthorization": [
              {
                "name": "from",
                "type": "address"
              },
              {
                "name": "to",
                "type": "address"
              },
              {
                "name": "value",
                "type": "uint256"
              },
              {
                "name": "validAfter",
                "type": "uint256"
              },
              {
                "name": "validBefore",
                "type": "uint256"
              },
              {
                "name": "nonce",
                "type": "bytes32"
              }
            ]
          },
          "domain": {
            "name": "USD Coin",
            "chainId": 8453,
            "version": "2",
            "verifyingContract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"
          },
          "message": {
            "to": "0xb753be5Eac5B29c711051DfF91279834e9C9b9AC",
            "from": "<payer_address>",
            "nonce": "<bytes32_nonce>",
            "value": "990000",
            "validAfter": "<unix_seconds>",
            "validBefore": "<unix_seconds>"
          },
          "version": "2",
          "primaryType": "TransferWithAuthorization"
        },
        "payTo": "0xb753be5Eac5B29c711051DfF91279834e9C9b9AC",
        "amount": "990000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 900
      }
    ],
    "unlocks": "24-hour access to the Zambo MCP connection, subject to product/provider allowances listed at https://zambo.dev/pricing",
    "resource": {
      "url": "https://zambo.dev/api/x402/day-pass",
      "mimeType": "application/json",
      "description": "Zambo Day Pass: $0.99 in Base USDC for 24-hour access to the Zambo MCP connection. Not per call - one payment covers 24 hours. Every call returns a verifiable receipt."
    },
    "human_url": "https://zambo.dev/day-pass",
    "no_wallet": "If you cannot sign an EIP-3009 TransferWithAuthorization on Base (most AI assistants cannot): STOP. Do not retry this call. Retrying without payment changes nothing and burns your free calls. Show your human this page instead: https://zambo.dev/day-pass - PayPal checkout, $0.99 for 24 hours, then paste the key into your MCP client as X-Zambo-Key.",
    "x402Version": 2,
    "agent_payment": {
      "tool": "day_pass_activate",
      "asset": "USDC",
      "step_1": "GET https://zambo.dev/api/x402/day-pass without payment to receive the live challenge",
      "step_2": "POST https://zambo.dev/api/x402/day-pass with X-Payment: <base64 JSON x402 envelope>",
      "network": "eip155:8453",
      "endpoint": "https://zambo.dev/api/mcp",
      "activation": "24-hour access; never activates without a verified transfer",
      "amount_usdc": "0.99",
      "network_name": "Base",
      "amount_atomic": "990000"
    },
    "payment_proof": {
      "header": "X-Payment",
      "encoding": "base64(JSON {x402Version,scheme,network,payload:{signature,authorization}})",
      "required": true,
      "destination": "https://zambo.dev/api/x402/day-pass"
    },
    "on_success_returns": [
      "receipt_url",
      "run_id",
      "uuid",
      "access_key",
      "expires_at",
      "x402_spend_receipt",
      "settlement_tx_hash"
    ]
  }
]