Verifiable receipt 9f5c66bd - day_pass_activate result | Zambo

Verifiable receipt for a day_pass_activate call on Zambo: { "receipt_id": "ff31ff8a-2ebb-441e-b415-e91b214b7f88", "type": "refusal", "timestamp": "2026-10-09T23

Observed result

{
  "receipt_id": "ff31ff8a-2ebb-441e-b415-e91b214b7f88",
  "type": "refusal",
  "timestamp": "2026-10-09T23:03:56.691Z",
  "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"
  },
  "policy_reason": "invalid_base64",
  "detail": "Correct the payment envelope: invalid_base64.",
  "retryable": true,
  "quoted_max_amount": "990000",
  "amount_units": "USDC_atomic_6dp",
  "settlement_window": {
    "opens_at": "2026-10-09T23:03:56.691Z",
    "closes_at": "2026-10-09T23:18:56.691Z"
  },
  "verifier_url": "https://zambo.dev/api/x402/refusal-receipt/ff31ff8a-2ebb-441e-b415-e91b214b7f88/audit",
  "attempt_hash": "sha256:960aeef51ddcd63a64564edab06f07d933a8d73ca770a4fd553d9f1ac4a96979",
  "challenge_ref": {
    "resource": "https://zambo.dev/api/x402/day-pass",
    "network": "eip155:8453",
    "asset": "0x8335…2913",
    "pay_to": "0xb753…b9AC",
    "amount": "990000",
    "max_timeout_seconds": 900,
    "issued_at": "2026-10-09T23:03:56.691Z"
  },
  "message": "Correct the payment envelope: invalid_base64.",
  "docs": "https://zambo.dev/for-agents",
  "diagnostic": {
    "code": "invalid_base64",
    "field": null,
    "issue": "The payment could not be validated.",
    "fix": "Request a fresh challenge and use an official x402 client."
  },
  "official_client": {
    "repository": "https://github.com/coinbase/x402",
    "packages": [
      "@x402/fetch",
      "@x402/evm"
    ]
  },
  "challenge": {
    "x402Version": 2,
    "error": "Payment required",
    "no_wallet": "No wallet found. Pay $0.99 with PayPal at https://zambo.dev/day-pass. ",
    "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": "Only after explicit human approval, POST https://zambo.dev/api/x402/day-pass with X-Payment: <base64 JSON x402 envelope>",
      "approval_required": "Obtain explicit human approval before signing or submitting a payment.",
      "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": "0x8335…2913",
        "amount": "990000",
        "payTo": "0xb753…b9AC",
        "maxTimeoutSeconds": 900,
        "extra": {
          "name": "USD Coin",
          "version": "2",
          "domain": {
            "name": "USD Coin",
            "version": "2",
            "chainId": 8453,
            "verifyingContract": "0x8335…2913"
          },
          "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": "0xb753…b9AC",
            "value": "990000",
            "validAfter": "<unix_seconds>",
            "validBefore": "<unix_seconds>",
            "nonce": "<bytes32_nonce>"
          }
        }
      }
    ]
  },
  "agent_flow": "Ask the human for explicit approval before signing. After approval, sign the typed EIP-3009 TransferWithAuthorization message from accepts[0].extra, base64-encode the x402 JSON envelope, and retry with x_payment plus human_approved=true."
}

Check this receipt

This record shows the result and timestamp stored for the call. Recompute the SHA-256 commitment from the saved bytes in your browser; signatures and chain proofs are not checked.

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?

Zambo's receipt store reports a tool call and records its result. The SHA-256 commitment covers the exact canonical bytes. The provenance label is bound to v0.4 receipt bytes when that check passes, but no pinned signature or trusted issuer key is checked. An anchor can timestamp a fingerprint; it does not authenticate the issuer.

What is an execution receipt?

An execution receipt is a public record of a reported AI agent tool call. Its byte commitment and provenance claim can be checked independently; neither alone authenticates the issuer. Read the canonical definition of an AI agent execution receipt.

Keep the work moving

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

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Verification checks

SHA-256 commitment: Checked independently against the exact decoded bytes
Provenance binding: PASS; The metadata claim is consistent with the verified receipt bytes; issuer is not authenticated.
Issuer authentication: NOT CHECKED; no pinned signing key or trusted issuer was supplied
Signature: NOT CHECKED; no Ed25519 signature or pinned key is supplied
Chain: NOT CHECKED; no append-only chain proof is validated
Stored timestamp: 2026-10-09T23:03:56.732Z; external immutability is not checked

Committed provenance claim

EXECUTED BY ZAMBO

The metadata claim is consistent with the verified receipt bytes; issuer is not authenticated.

Receipt ID: 9f5c66bd-93bf-42c7-820f-d45e919a111a
SHA-256 output hash: sha256:bed52c5cd14e7474cf0b93433a8fcc8a9892e33af80dce736bd86cd6da5ddd35
Canonical bytes: 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
Timestamp: 2026-10-09T23:03:56.732Z

Bound call context

Receipt schema: 0.4
Tool name: day_pass_activate
Tool version: 4.0.0
Permission scope: public
Caller type: anonymous
Caller ID: sha256:c9bd2ac257eaa4ff5deaf66cd511d682d8ac592f7116f01d757b540ffcc97f94
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: sha256:47cf4dffc9f92bd8b61b79d7beec70f06bceb17df79b732856fba3061fd24254
Byte length: 3831

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID: d6ea561926e5f222db059b0dc2b75a44282950c684724324d4f7cf8cbbec57b4
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":"2026-10-09T23:03:56.732Z","evidence_byte_length":3831,"evidence_sha256":"sha256:47cf4dffc9f92bd8b61b79d7beec70f06bceb17df79b732856fba3061fd24254","evidence_url":"https://zambo.dev/api/evidence/47cf4dffc9f92bd8b61b79d7beec70f06bceb17df79b732856fba3061fd24254","output_sha256":"sha256:bed52c5cd14e7474cf0b93433a8fcc8a9892e33af80dce736bd86cd6da5ddd35","receipt_uuid":"9f5c66bd-93bf-42c7-820f-d45e919a111a","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

Recompute the SHA-256 commitment in your browser. Open the API v2 JSON response to inspect the machine-readable checks. Signature and chain remain NOT CHECKED unless a real signature verifier or chain proof is supplied. There is no combined “verified” verdict. See the Nostr anchor event on a public viewer. The fingerprint is timestamped outside Zambo too.

Embed this receipt

Markdown

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HTML

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