Verifiable receipt cf1ff766 — day_pass_activate result | Zambo

Verifiable receipt for a day_pass_activate call on Zambo: { "x402Version": 2, "error": "Payment required", "human_url": "https://zambo.dev/day-pass", "usage": {

What is this?

An AI agent did real work through Zambo, and this page is the proof. The SHA-256 hash below is a fingerprint of exactly what the agent produced — change one character of the output and the fingerprint changes. The timestamp shows when it ran. The Nostr anchor posts that fingerprint to public relays, so the record exists outside Zambo too — anyone can look it up by the event ID below. You don't have to take the agent's word for it. Check the hash yourself.

What is an execution receipt?

An execution receipt is the public record of one completed AI agent tool call. Read the canonical definition of an AI agent execution receipt.

Observed result

{
  "x402Version": 2,
  "error": "Payment required",
  "human_url": "https://zambo.dev/day-pass",
  "usage": {
    "session_calls": 0,
    "session_calls_scope": "this_session",
    "quota_calls": 0,
    "quota_calls_scope": "caller_quota_window",
    "tools_used": 0,
    "tool_breakdown": {},
    "human_url": "https://zambo.dev/day-pass",
    "reset_at": "2026-09-22T00:00:00.000Z",
    "quota_tier": "free_20"
  },
  "agent_payment": {
    "tool": "day_pass_activate",
    "step_1": "GET https://zambo.dev/api/x402/day-pass without payment to receive the live challenge",
    "amount_usdc": "1.49",
    "amount_atomic": "1490000",
    "asset": "USDC",
    "network": "eip155:8453",
    "network_name": "Base",
    "step_2": "POST https://zambo.dev/api/x402/day-pass with X-Payment: <base64 JSON x402 envelope>",
    "activation": "24-hour access; never activates without a verified transfer",
    "endpoint": "https://zambo.dev/api/mcp"
  },
  "resource": {
    "url": "https://zambo.dev/api/x402/day-pass",
    "description": "Zambo Day Pass: $1.49 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.",
    "mimeType": "application/json"
  },
  "payment_proof": {
    "header": "X-Payment",
    "destination": "https://zambo.dev/api/x402/day-pass",
    "encoding": "base64(JSON {x402Version,scheme,network,payload:{signature,authorization}})",
    "required": true
  },
  "unlocks": "24-hour access to the Zambo MCP connection, subject to product/provider allowances listed at https://zambo.dev/pricing",
  "on_success_returns": [
    "receipt_url",
    "run_id",
    "uuid",
    "access_key",
    "expires_at",
    "x402_spend_receipt",
    "settlement_tx_hash"
  ],
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "asset": "[REDACTED_ADDRESS]",
      "amount": "1490000",
      "payTo": "[REDACTED_ADDRESS]",
      "maxTimeoutSeconds": 900,
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "domain": {
          "name": "USD Coin",
          "version": "2",
          "chainId": 8453,
          "verifyingContract": "[REDACTED_ADDRESS]"
        },
        "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"
            }
          ]
        },
        "primaryType": "TransferWithAuthorization",
        "message": {
          "from": "<payer_address>",
          "to": "[REDACTED_ADDRESS]",
          "value": "1490000",
          "validAfter": "<unix_seconds>",
          "validBefore": "<unix_seconds>",
          "nonce": "<bytes32_nonce>"
        }
      }
    }
  ],
  "agent_flow": "Sign the typed EIP-3009 TransferWithAuthorization message from accepts[0].extra, base64-encode the x402 JSON envelope, and retry with x_payment."
}

Keep the work moving

This receipt proves the call completed. When the free allowance is not enough, choose the access path that fits the job.

UNLOCK 24H DAY PASS ($1.49) → ZAMBO PASS $49 →

RUN YOUR OWN FREE CALL →

Or re-run this exact call — same tool, same arguments.

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Verification checks

Proof of observed execution

Receipt ID
cf1ff766-fe58-4d31-ae36-11929e6d8e75
SHA-256 output hash
sha256:87745828ca174945498fe47e493cd094bacc0bd77dd9801e41458a489391e196
Canonical bytes
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
Timestamp

Bound call context

Receipt schema
0.3
Tool name
day_pass_activate
Tool version
4.0.0
Permission scope
public
Caller type
anonymous
Caller ID
sha256:9476e321f84faad7ec71f9d82da373bd5ef59fd4476482f2e83d662dcd29e5d5
Declared side effects
state_write
Side-effects schema
zambo-side-effects/1
Declaration hash
sha256:dfb4412aa429d3ac637a05668c435bcc90a251363fcdd49f7b85ae4ab55b5bc9

This records what the server-side tool contract declared at call time. It does not independently verify that a downstream side effect happened.

Bound upstream evidence

Status
captured
Evidence SHA-256
sha256:e5c70fbcb1299b83f7bfc281200ef76bef6f9748ab4808a31c216e9c118e80fa
Byte length
2380

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID
c9b520310f2dc6f13094660f10b8005a29de650a663af3d4e0a5b00441a0a59b
Anchor status
partial
Public key
e13475107d30c918ec664adf2ab1141024a22fb35190f82c9e933704fa49af41

Relay hints: wss://relay.damus.io · wss://nos.lol · wss://relay.primal.net

Schema: zambo-receipt-anchor/1

Anchor envelope bytes:

{"anchored_at":"2026-09-21T16:42:53.318Z","evidence_byte_length":2380,"evidence_sha256":"sha256:e5c70fbcb1299b83f7bfc281200ef76bef6f9748ab4808a31c216e9c118e80fa","evidence_url":"https://zambo.dev/api/evidence/e5c70fbcb1299b83f7bfc281200ef76bef6f9748ab4808a31c216e9c118e80fa","output_sha256":"sha256:87745828ca174945498fe47e493cd094bacc0bd77dd9801e41458a489391e196","receipt_uuid":"cf1ff766-fe58-4d31-ae36-11929e6d8e75","schema_version":"zambo-receipt-anchor/1"}

Anchor status "partial": Published to some configured relay targets; publication was not confirmed by every configured relay.

Check this hash yourself

Open the verification endpoint — the server recomputes the SHA-256 from the stored bytes and answers verified:true. If it doesn't say verified, don't trust this page. See the Nostr anchor event on a public viewer — the fingerprint is timestamped outside Zambo too.

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HTML

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