Verifiable receipt f427e247 - day_pass_activate result | Zambo

✓ This result hasn’t changed since it was saved.

Saved:
What was asked: The request recorded for this receipt.

Zambo is the verifiable work layer for AI.

Zambo is the verifiable work layer for AI. Verifiable receipt for a day_pass_activate call on Zambo: {"receipt_id":"4b17cee7-6c45-4e9b-8d32-f3756f4243cd","type":"refusal","timestamp":"2026-10-21T02:43:11

Observed result

receipt id: 4b17cee7-6c45-4e9b-8d32-f3756f4243cd type: refusal timestamp: 2026-10-21T02:43:11.524Z resource / url: https://zambo.dev/api/x402/day-pass resource / 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. resource / mimeType: application/json policy reason: policy_blocked detail: The payment could not be accepted for settlement; do not assume access was activated. retryable: false quoted max amount: 990000 amount units: USDC_atomic_6dp settlement window / opens at: 2026-10-21T02:43:11.524Z settlement window / closes at: 2026-10-21T02:58:11.524Z verifier url: https://zambo.dev/api/x402/refusal-receipt/4b17cee7-6c45-4e9b-8d32-f3756f4243cd/audit attempt hash: sha256:6ed1ec685f6b6fb79866d1dcfec742e5e8e3e62e2e17a5c1d0fd3a49b17d8dd7 challenge ref / resource: https://zambo.dev/api/x402/day-pass challenge ref / network: eip155:8453 challenge ref / asset: 0x8335…2913 challenge ref / pay to: 0xb753…b9AC challenge ref / amount: 990000 challenge ref / max timeout seconds: 900 challenge ref / issued at: 2026-10-21T02:43:11.524Z message: The payment could not be accepted for settlement; do not assume access was activated. docs: https://zambo.dev/for-agents diagnostic / code: settlement_submission_failed diagnostic / issue: The payment could not be validated. diagnostic / fix: Request a fresh challenge and use an official x402 client. official client / repository: https://github.com/coinbase/x402 official client / packages 1: @x402/fetch official client / packages 2: @x402/evm challenge / x402Version: 2 challenge / error: Payment required challenge / no wallet: For human checkout, open human_url. challenge / human url: https://zambo.dev/day-pass/ challenge / agent payment / tool: day_pass_activate challenge / agent payment / step 1: GET https://zambo.dev/api/x402/day-pass without payment to receive the live challenge challenge / agent payment / amount usdc: 0.99 challenge / agent payment / amount atomic: 990000 challenge / agent payment / asset: USDC challenge / agent payment / network: eip155:8453

This is the saved result preview, not proof that the answer was correct.

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Show technical provenance details

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 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.

What the receipt can and cannot prove

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.

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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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Show technical verification checks

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.
  • Metadata binding: PASS; metadata_hash matches the canonical metadata block.
  • 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: 2026-10-21T02:43:11.577Z; external immutability is not checked

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Get receipts for your own AI work: add zambo.dev/mcp

One URL, no key. Copy the line for your AI and add it yourself in its settings.

  • ClaudeSettings, Connectors, Add custom connector, paste the URL.
    https://zambo.dev/mcp
  • ChatGPTSettings, Apps and Connectors, developer mode, create a connector with this URL.
    https://zambo.dev/mcp
  • GrokAdd a remote MCP server in your Grok client and paste the URL.
    https://zambo.dev/mcp
  • CursorPaste into ~/.cursor/mcp.json.
    {"mcpServers":{"zambo":{"url":"https://zambo.dev/mcp"}}}

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Show receipt data and verification evidence

Committed provenance claim

EXECUTED BY ZAMBO

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

Receipt ID
f427e247-4a22-4dd9-95d4-ed4be3b388a2
SHA-256 output hash
sha256:d8f9c24fe24c6bf0a52b5bf3b16658326c92ba02f79da906e09b9c12a74860b6
Canonical bytes
{"caller":{"id":"sha256:0d021fb043b5f66ac3a1b015d943e6e4c62053553b4aa2d2643863fb7203a83a","type":"session"},"issuer_claims":{"provenance_class":"EXECUTED BY ZAMBO"},"output":{"agent_flow":"No human approval is required by Zambo. Follow your own wallet or spending policy, sign the typed EIP-3009 TransferWithAuthorization message from accepts[0].extra, base64-encode the x402 JSON envelope, and retry the same call with PAYMENT-SIGNATURE (X-Payment is also accepted).","amount_units":"USDC_atomic_6dp","attempt_hash":"sha256:6ed1ec685f6b6fb79866d1dcfec742e5e8e3e62e2e17a5c1d0fd3a49b17d8dd7","challenge":{"accepts":[{"amount":"990000","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","extra":{"domain":{"chainId":8453,"name":"USD Coin","verifyingContract":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","version":"2"},"message":{"from":"<payer_address>","nonce":"<bytes32_nonce>","to":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","validAfter":"<unix_seconds>","validBefore":"<unix_seconds>","value":"990000"},"name":"USD Coin","primaryType":"TransferWithAuthorization","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"}]},"version":"2"},"maxTimeoutSeconds":900,"network":"eip155:8453","payTo":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","scheme":"exact"}],"agent_payment":{"activation":"24-hour access; never activates without a verified transfer","amount_atomic":"990000","amount_usdc":"0.99","asset":"USDC","autonomous_payment_policy":"Agents may pay the $0.99 USDC Day Pass (x402 on Base, 24 hours) directly. No human approval is required by Zambo. Your own wallet or spending policy still applies.","endpoint":"https://zambo.dev/mcp","network":"eip155:8453","network_name":"Base","step_1":"GET https://zambo.dev/api/x402/day-pass without payment to receive the live challenge","step_2":"Sign the live challenge and retry the same call with PAYMENT-SIGNATURE (x402 v2; X-Payment is still accepted).","tool":"day_pass_activate"},"autonomous_payment_policy":"Agents may pay the $0.99 USDC Day Pass (x402 on Base, 24 hours) directly. No human approval is required by Zambo. Your own wallet or spending policy still applies.","error":"Payment required","human_url":"https://zambo.dev/day-pass/","no_wallet":"For human checkout, open human_url.","on_success_returns":["receipt_url","run_id","uuid","access_key","expires_at","x402_spend_receipt","settlement_tx_hash"],"payment_proof":{"accepted":{"amount":"990000","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","extra":{"domain":{"chainId":8453,"name":"USD Coin","verifyingContract":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","version":"2"},"message":{"from":"<payer_address>","nonce":"<bytes32_nonce>","to":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","validAfter":"<unix_seconds>","validBefore":"<unix_seconds>","value":"990000"},"name":"USD Coin","primaryType":"TransferWithAuthorization","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"}]},"version":"2"},"maxTimeoutSeconds":900,"network":"eip155:8453","payTo":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","scheme":"exact"},"destination":"https://zambo.dev/api/x402/day-pass","encoding":"base64(JSON {x402Version:2,accepted:{scheme,network,asset,amount,payTo,maxTimeoutSeconds,extra},payload:{signature,authorization}})","header":"PAYMENT-SIGNATURE (X-Payment also accepted)","required":true,"retry_policy":"A refused invalid signature is retryable with a newly signed authorization. Never reuse a consumed nonce or a prior signature. Request a fresh challenge if expired."},"resource":{"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","url":"https://zambo.dev/api/x402/day-pass"},"unlocks":"24-hour access to the Zambo MCP connection, subject to product/provider allowances listed at https://zambo.dev/pricing","x402Version":2},"challenge_ref":{"amount":"990000","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","issued_at":"2026-10-21T02:43:11.524Z","max_timeout_seconds":900,"network":"eip155:8453","pay_to":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","resource":"https://zambo.dev/api/x402/day-pass"},"detail":"The payment could not be accepted for settlement; do not assume access was activated.","diagnostic":{"code":"settlement_submission_failed","field":null,"fix":"Request a fresh challenge and use an official x402 client.","issue":"The payment could not be validated."},"docs":"https://zambo.dev/for-agents","message":"The payment could not be accepted for settlement; do not assume access was activated.","official_client":{"packages":["@x402/fetch","@x402/evm"],"repository":"https://github.com/coinbase/x402"},"policy_reason":"policy_blocked","quoted_max_amount":"990000","receipt_id":"4b17cee7-6c45-4e9b-8d32-f3756f4243cd","resource":{"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","url":"https://zambo.dev/api/x402/day-pass"},"retryable":false,"settlement_window":{"closes_at":"2026-10-21T02:58:11.524Z","opens_at":"2026-10-21T02:43:11.524Z"},"timestamp":"2026-10-21T02:43:11.524Z","type":"refusal","verifier_url":"https://zambo.dev/api/x402/refusal-receipt/4b17cee7-6c45-4e9b-8d32-f3756f4243cd/audit"},"receipt_schema_version":"0.4","side_effects":{"declaration_hash":"sha256:dfb4412aa429d3ac637a05668c435bcc90a251363fcdd49f7b85ae4ab55b5bc9","declared":["state_write"],"schema_version":"zambo-side-effects/1"},"tool":{"name":"day_pass_activate","scope":"public","version":"4.0.0"}}
Timestamp

Bound call context

Receipt schema
0.4
Tool name
day_pass_activate
Tool version
4.0.0
Permission scope
public
Caller type
session
Caller ID
sha256:0d021fb043b5f66ac3a1b015d943e6e4c62053553b4aa2d2643863fb7203a83a
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
sha256:1666ab0379d5206e718e51cc77e58c7784a2fc2a10e549014489b0a9c045f851
Byte length
5296

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID
9f8895ea4759a7f7e98211415f4fd4defb3e44caceef1c8889af1cd503ea8092
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":"2026-10-21T02:43:11.577Z","evidence_byte_length":5296,"evidence_sha256":"sha256:1666ab0379d5206e718e51cc77e58c7784a2fc2a10e549014489b0a9c045f851","evidence_url":"https://zambo.dev/api/evidence/1666ab0379d5206e718e51cc77e58c7784a2fc2a10e549014489b0a9c045f851","output_sha256":"sha256:d8f9c24fe24c6bf0a52b5bf3b16658326c92ba02f79da906e09b9c12a74860b6","receipt_uuid":"f427e247-4a22-4dd9-95d4-ed4be3b388a2","schema_version":"zambo-receipt-anchor/1"}

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

Check this hash yourself

Receipt commitment: commitment matched; issuer, signature and chain not checked. This checks the saved bytes, not whether the answer was correct. Recompute the SHA-256 commitment in your browser. Open the API v2 JSON response to inspect the machine-readable checks. See the Nostr anchor event on a public viewer. The fingerprint is timestamped outside Zambo too.

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