Verifiable receipt b64e5379 - day_pass_activate result | Zambo

Verifiable receipt for a day_pass_activate call on Zambo: { "x402Version": 2, "error": "Payment required", "no_wallet": "If you cannot sign an EIP-3009 Transfer

Observed result

{
  "x402Version": 2,
  "error": "Payment required",
  "no_wallet": "If you cannot sign an EIP-3009 TransferWithAuthorization on Base, stop and do not retry without payment. Ask a human to activate the 24-hour Day Pass for $0.99 using card or PayPal at https://zambo.dev/day-pass, then retry with the issued X-Zambo-Key. Wallet-enabled agents use x402: $0.99 USDC on Base.",
  "human_url": "https://zambo.dev/day-pass",
  "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": "0.99",
    "amount_atomic": "990000",
    "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: $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.",
    "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": "990000",
      "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": "990000",
          "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."
}

Verify this receipt

This is a verifiable receipt: the result above is hashed and timestamped at a permanent URL.

Provenance for every timeline entry

EXECUTED BY ZAMBOZambo ran the tool call itself.
OBSERVED VIA GATEWAYA Zambo gateway observed request and response bytes from the named external executor. Zambo did not run that external action.
LOGGED BY AGENTAn agent or local hook reported the action. Zambo attests that the record is unchanged since logging, not that the action happened as described.

Private agent reasoning, built-in client actions, and direct calls to unrelated MCP servers are not included unless an agent or gateway reports them.

What is this?

An AI agent completed a tool call through Zambo, and this page records the result. The SHA-256 hash below fingerprints exactly what the agent produced. The timestamp shows when it ran. The Nostr anchor posts that fingerprint to public relays, so the record exists outside Zambo too. 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.

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 ($0.99) →

See all plans on the pricing page →

RUN YOUR OWN FREE CALL →

Or re-run this exact call, using the same tool and arguments.

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Verification checks

Integrity check: Recomputable from canonical bytes
Issued by zambo.dev: Served from the zambo.dev receipt store
Chain valid: Receipt hash chain is internally consistent
Recorded in the immutable log: 2026-10-03T11:31:22.447Z

Proof of observed execution

EXECUTED BY ZAMBO

Receipt ID: b64e5379-e8ea-4e13-a4d8-2e9c535c71c4
SHA-256 output hash: sha256:b0b921a4e849cb7beaaf446adbbea473c65ddf47cc62e3ab9f826f177f734978
Canonical bytes: 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
Timestamp: 2026-10-03T11:31:22.447Z

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:c95483b40892b2451e7a5b8c47eac668fea12e7cb189bceac6bfe32a19e7790b
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: sha256:17dcd205fe739571adc6e6bcc0096627c39d86e7b58f92b597fcb9924ec8ca3f
Byte length: 2433

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID: 571e06ed079e2745a1adde77ea131e7c724ba29dba89411fa0a22fea4f87ba4f
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":"2026-10-03T11:31:22.417Z","evidence_byte_length":2433,"evidence_sha256":"sha256:17dcd205fe739571adc6e6bcc0096627c39d86e7b58f92b597fcb9924ec8ca3f","evidence_url":"https://zambo.dev/api/evidence/17dcd205fe739571adc6e6bcc0096627c39d86e7b58f92b597fcb9924ec8ca3f","output_sha256":"sha256:b0b921a4e849cb7beaaf446adbbea473c65ddf47cc62e3ab9f826f177f734978","receipt_uuid":"b64e5379-e8ea-4e13-a4d8-2e9c535c71c4","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 does not say verified, do not trust this page. See the Nostr anchor event on a public viewer. The fingerprint is timestamped outside Zambo too.

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