Verifiable receipt 05de5217 — 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
05de5217-265b-4478-9bd6-845463d78abb
SHA-256 output hash
sha256:f83f7d350be1e03e9c5b4ecb4907491cb5025340626185ff907785960c82b8af
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
sha256:5e4fb3da2fe55168a5afb3130f2fa9c3b9f8675c6dbfcd10b1aee338ca1bd301
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
a620fa5cb063f473bcd0af0fedc3eebf3d08f674145537c712a8bf05d430d689
Anchor status
published
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":"2026-09-21T16:43:40.458Z","evidence_byte_length":2380,"evidence_sha256":"sha256:e5c70fbcb1299b83f7bfc281200ef76bef6f9748ab4808a31c216e9c118e80fa","evidence_url":"https://zambo.dev/api/evidence/e5c70fbcb1299b83f7bfc281200ef76bef6f9748ab4808a31c216e9c118e80fa","output_sha256":"sha256:f83f7d350be1e03e9c5b4ecb4907491cb5025340626185ff907785960c82b8af","receipt_uuid":"05de5217-265b-4478-9bd6-845463d78abb","schema_version":"zambo-receipt-anchor/1"}

Anchor status "published": Published to all configured relay targets.

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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Markdown

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HTML

<a href="https://zambo.dev/run/05de5217-265b-4478-9bd6-845463d78abb"><img src="https://zambo.dev/api/receipt/05de5217-265b-4478-9bd6-845463d78abb/badge.svg" alt="Verifiable Zambo receipt"></a>

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