Verifiable receipt 3bf1534b - day_pass_activate result | Zambo

Verifiable receipt for a day_pass_activate call on Zambo: {"receipt_id":"e5b10b28-0469-4c70-bf4a-6b889d9c61a8","type":"refusal","timestamp":"2026-10-13T08:28:10

Observed result

{"receipt_id":"e5b10b28-0469-4c70-bf4a-6b889d9c61a8","type":"refusal","timestamp":"2026-10-13T08:28:10.410Z","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":"missing_field:x402Version","detail":"Correct the payment envelope: missing_field:x402Version.","retryable":true,"quoted_max_amount":"990000","amount_units":"USDC_atomic_6dp","settlement_window":{"opens_at":"2026-10-13T08:28:10.410Z","closes_at":"2026-10-13T08:43:10.410Z"},"verifier_url":"https://zambo.dev/api/x402/refusal-receipt/e5b10b28-0469-4c70-bf4a-6b889d9c61a8/audit","attempt_hash":"sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a","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":"2026-10-13T08:28:10.410Z"},"message":"Correct the payment envelope: missing_field:x402Version.","docs":"https://zambo.dev/for-agents","diagnostic":{"code":"missing_field:x402Version","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":"For human checkout, open human_url.","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":"Sign the live challenge and retry the same call with PAYMENT-SIGNATURE (x402 v2; X-Payment is still accepted).","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.","activation":"24-hour access; never activates without a verified transfer","endpoint":"https://zambo.dev/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":"PAYMENT-SIGNATURE (X-Payment also accepted)","destination":"https://zambo.dev/api/x402/day-pass","encoding":"base64(JSON {x402Version:2,accepted:{scheme,network,asset,amount,payTo,maxTimeoutSeconds,extra},payload:{signature,authorization}})","required":true,"accepted":{"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>"}}},"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."},"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.","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":"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)."}

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

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Provenance for every timeline entry

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.

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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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Verification checks

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Committed provenance claim

EXECUTED BY ZAMBO

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

Receipt ID
3bf1534b-8e72-4f5d-988e-99c5e619a1a4
SHA-256 output hash
sha256:f31c5e12d3c28f3e3848b1c477a5d51a9e353a478c50c83a8f4ad0428c876a09
Canonical bytes
{"caller":{"basis":"ip_ua_30d","id":"sha256:6ef3383f06ceac91eb85be07741919431625d72d2cbee8afc9850b852ac8b4a0","rotates_at":"2026-11-03T00:00:00.000Z","type":"anonymous"},"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":"sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a","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":"2026-10-13T08:28:10.410Z","max_timeout_seconds":900,"network":"eip155:8453","pay_to":"0xb753be5Eac5B29c711051DfF91279834e9C9b9AC","resource":"https://zambo.dev/api/x402/day-pass"},"detail":"Correct the payment envelope: missing_field:x402Version.","diagnostic":{"code":"missing_field:x402Version","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":"Correct the payment envelope: missing_field:x402Version.","official_client":{"packages":["@x402/fetch","@x402/evm"],"repository":"https://github.com/coinbase/x402"},"policy_reason":"missing_field:x402Version","quoted_max_amount":"990000","receipt_id":"e5b10b28-0469-4c70-bf4a-6b889d9c61a8","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":true,"settlement_window":{"closes_at":"2026-10-13T08:43:10.410Z","opens_at":"2026-10-13T08:28:10.410Z"},"timestamp":"2026-10-13T08:28:10.410Z","type":"refusal","verifier_url":"https://zambo.dev/api/x402/refusal-receipt/e5b10b28-0469-4c70-bf4a-6b889d9c61a8/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
anonymous
Caller ID
sha256:6ef3383f06ceac91eb85be07741919431625d72d2cbee8afc9850b852ac8b4a0
Caller basis
ip_ua_30d
Caller rotates at
2026-11-03T00:00:00.000Z
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:f77f725a5e726393082dd639883710e76b4a1d15e82cdecee65e5731a56ae232
Byte length
5244

Fetch exact evidence bytes

Neutral Nostr anchor

Event ID
8904a58b7ab394047e558f1b51ac7639a566083e4f9a582be36e9d409faa31c5
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":"2026-10-13T08:28:10.445Z","evidence_byte_length":5244,"evidence_sha256":"sha256:f77f725a5e726393082dd639883710e76b4a1d15e82cdecee65e5731a56ae232","evidence_url":"https://zambo.dev/api/evidence/f77f725a5e726393082dd639883710e76b4a1d15e82cdecee65e5731a56ae232","output_sha256":"sha256:f31c5e12d3c28f3e3848b1c477a5d51a9e353a478c50c83a8f4ad0428c876a09","receipt_uuid":"3bf1534b-8e72-4f5d-988e-99c5e619a1a4","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

API v2 status: verified. This status summarizes the v2 commitment and provenance checks; it does not prove 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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