{"api_version":2,"receipt_profile":"zambo-hosted-receipt/1","schema_url":"https://zambo.dev/aer-1/hosted-profile.schema.json","id":"d9b1c60b-fc84-474f-a31f-36f81b597d59","source_url":"https://zambo.dev/api/receipt/d9b1c60b-fc84-474f-a31f-36f81b597d59","receipt":{"id":"d9b1c60b-fc84-474f-a31f-36f81b597d59","created_at":"2026-10-20T01:29:32.419Z","receipt_schema_version":"0.4","job_summary":"url: https://zambo.dev/guides/x402-agent-payments/","tools":["pdf_extract"],"steps":[{"tool":"pdf_extract","status":"success","started_at":"2026-10-20T01:29:32.333Z","completed_at":"2026-10-20T01:29:32.419Z"}],"output_hash":"sha256:b3be35899b95510ae85e281ce1f9e61214a48a67aaaa89c662e0aa38645f766e","hash_algorithm":"sha256","canonical_bytes":"{"caller":{"id":"sha256:111dce77c276fcfb7790d78c641bea8ff69db5fee326d116a76f13739ea04b52","type":"api_key"},"issuer_claims":{"provenance_class":"EXECUTED BY ZAMBO"},"output":{"content_type":"text/html","extracted_text":"X402 day pass payments for funded AI agents | Zambo\n\n← All guides\n\nAgent payments · Zambo\n\nx402 Day Pass payments for funded AI agents\n\nx402 agent payments, live on this site  The endpoint below answers a real x402 challenge today. A funded agent using a compatible x402 client may pay for its own Day Pass within its spending policy. Do not submit a payment merely to inspect the challenge.\n\ncurl -i https://zambo.dev/api/x402/day-pass\n\nThe GET returns HTTP 402. This is the checked response shape, limited to the challenge's resource and payment requirement fields. Fetch a fresh challenge before authorizing payment.\n\n{\n\n&quot;x402Version&quot;: 2,\n\n&quot;resource&quot;: {\n\n&quot;url&quot;: &quot;https://zambo.dev/api/x402/day-pass&quot;\n\n},\n\n&quot;accepts&quot;: [\n\n{\n\n&quot;scheme&quot;: &quot;exact&quot;,\n\n&quot;amount&quot;: &quot;990000&quot;,\n\n&quot;network&quot;: &quot;eip155:8453&quot;,\n\n&quot;asset&quot;: &quot;0x833589fcd6edb6e08f4c7c32d4f71b54bda02913&quot;,\n\n&quot;payTo&quot;: &quot;0xb753be5Eac5B29c711051DfF91279834e9C9b9AC&quot;\n\n}\n\n]\n}\n\nAfter settlement, keep the spend receipt and access expiry with the subsequent tool receipt. The paid call's work enters the same verifiable receipt trail as a free Zambo call; a payment alone is not evidence that the work succeeded. x402 is a payment convention Zambo implements, not a Zambo invention.  A receipt proves the saved result was not changed since it was saved. It never proves the answer was right and never proves an external event happened.\n\nZambo x402 returns a machine-readable HTTP 402 challenge for the $0.99, 24-hour USDC-on-Base Day Pass. A funded agent may pay for its own Day Pass when its configured spending policy permits; users can instruct it not to self-pay or to ask first. This permission applies only to the Day Pass, not Zambo Pass or ProvibeCode. The Day Pass is time-based, not per-call.\n\nTry the Zambo demo  ·  Explore Zambo\n\nHow Zambo does it\n\nZambo publishes its payment contract at  /.well-known/x402 . Request  GET /api/x402/day-pass  without payment to receive the live x402 challenge for $0.99 USDC on Base. If the agent is funded and its spending policy allows this purchase, an official client signs the EIP-3009 authorization and retries  POST /api/x402/day-pass  with the proof. Respect any user instruction not to self-pay or to ask first. The server verifies settlement before activating the 24-hour pass. MCP callers can use  day_pass_activate  for the same challenge flow and bind it to the current job with  _session_id .\n\nOfficial TypeScript client\n\nmatching package versions on October 4, 2026:  @x402/core ,  @x402/fetch , and  @x402/evm  2.28.0. The client automatically handles the challenge after you invoke it. The example enforces the Base USDC asset and 0.99 USDC amount in the x402 hook. It submits a real payment on Base, so use it only with a funded agent and within its configured spending policy. Users may instruct the agent not to self-pay or to ask first. Keep the wallet key in a secret store.\n\nnpm install @x402/core@2.28.0 @x402/fetch@2.28.0 @x402/evm@2.28.0 viem\n\nimport { wrapFetchWithPayment, x402HTTPClient } from \"@x402/fetch\";\nimport { x402Client } from \"@x402/core/client\";\nimport { ExactEvmScheme } from \"@x402/evm/exact/client\";\nimport { privateKeyToAccount } from \"viem/accounts\";\n\nconst key = process.env.EVM_PRIVATE_KEY;\nif (!key || !/^0x[a-fA-F0-9]{64}$/.test(key)) throw new Error(\"Load the wallet key from a secret store.\");\nconst signer = privateKeyToAccount(key as \\`0x${string}\\`);\n\nconst client = new x402Client();\nclient.register(\"eip155:8453\", new ExactEvmScheme(signer));\nclient.onBeforePaymentCreation(async ({ selectedRequirements }) => {\n\nconst correctUsdc = selectedRequirements.asset.toLowerCase() === \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\";\n\nif (selectedRequirements.network !== \"eip155:8453\" || !correctUsdc || String(selectedRequirements.amount) !== \"990000\") {\n\nreturn { abort: true, reason: \"This example only permits the 0.99 USDC Base Day Pass.\" };\n\n}\n});\nconst fetchWithPayment = wrapFetchWithPayment(fetch, client);\nconst httpClient = new x402HTTPClient(client);\nconst jobId = process.env.ZAMBO_JOB_ID; // Optional: bind the pass to this existing job.\nconst body = jobId ? { _session_id: jobId } : {};\nconst response = await fetchWithPayment(\"https://zambo.dev/api/x402/day-pass\", {\n\nmethod: \"POST\",\n\nheaders: { \"Content-Type\": \"application/json\" },\n\nbody: JSON.stringify(body),\n});\nconst result = await httpClient.processResponse(response);\n\nif (result.paymentStatus !== \"settled\" || !response.ok) {\n\nconsole.error(\"Payment or activation was refused; inspect the refusal receipt and do not retry blindly.\");\n\nprocess.exitCode = 1;\n} else {\n\nconst payload = result.body && typeof result.body === \"object\" ? result.body as Record<string, unknown> : {};\n\nconst accessKey = payload.access_key;\n\nconst expiresAt = payload.expires_at;\n\nconst spendReceipt = payload.spend_receipt;\n\nif (typeof accessKey !== \"string\" || !accessKey || typeof expiresAt !== \"string\" || !spendReceipt) {\n\nthrow new Error(\"Activation response is missing its access key, expiry, or spend receipt.\");\n\n}\n\n// Keep accessKey in memory or a secret store. Never print it or put it in a URL.\n\n// Resume the same job with X-Zambo-Key (or _zambo_key) before expiresAt.\n\nconsole.log(\"Day Pass active until\", expiresAt, \"settlement\", payload.payment?.transaction);\n}\n\nOfficial Python client\n\nThe official PyPI package was  x402  2.25.0 when checked on October 4, 2026. Its HTTP wrapper handles the challenge and retry. This submits a real payment on Base, so use it only with a funded agent and within its configured spending policy. Users may instruct the agent not to self-pay or to ask first. The example checks the exact asset, network, and amount in the official client hook.\n\npip install \"x402[httpx,evm]==2.25.0\"\n\nimport asyncio\nimport os\nfrom eth_account import Account\nfrom x402 import AbortResult, x402Client\nfrom x402.http.clients import x402HttpxClient\nfrom x402.mechanisms.evm import EthAccountSigner\nfrom x402.mechanisms.evm.exact.register import register_exact_evm_client\n\nasync def main():\n\nclient = x402Client()\n\naccount = Account.from_key(os.environ[\"EVM_PRIVATE_KEY\"])\n\nregister_exact_evm_client(client, EthAccountSigner(account))\n\nasync def enforce_day_pass_spending_policy(context):\n\nrequirements = context.selected_requirements\n\ncorrect_usdc = requirements.asset.lower() == \"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\"\n\nif requirements.network != \"eip155:8453\" or not correct_usdc or int(requirements.amount) != 990000:\n\nreturn AbortResult(reason=\"This example only permits the 0.99 USDC Base Day Pass.\")\n\nclient.on_before_payment_creation(enforce_day_pass_spending_policy)\n\nasync with x402HttpxClient(client) as http:\n\njob_id = os.getenv(\"ZAMBO_JOB_ID\")\n\nresponse = await http.post(\n\n\"https://zambo.dev/api/x402/day-pass\",\n\njson={\"_session_id\": job_id} if job_id else {},\n\n)\n\nawait response.aread()\n\nif response.status_code != 200:\n\nprint(\"Payment or activation was refused; inspect the refusal receipt and do not retry blindly.\")\n\nreturn\n\nresult = response.json()\n\naccess_key = result.get(\"access_key\")\n\nexpires_at = result.get(\"expires_at\")\n\nspend_receipt = result.get(\"spend_receipt\")\n\nif not isinstance(access_key, str) or not access_key or not isinstance(expires_at, str) or not spend_receipt:\n\nraise RuntimeError(\"Activation response is missing its access key, expiry, or spend receipt.\")\n\n# Keep access_key in memory or a secret store. Never print it or put it in a URL.\n\n# Resume the same job with X-Zambo-Key (or _zambo_key) before expires_at.\n\nasyncio.run(main())\n\nHuman checkout via PayPal\n\nAsk the person whether they want a PayPal checkout link. Only after they explicitly agree, call  day_pass_checkout_link  with  human_approved=true . The 30-minute URL creates no order or charge; the person must open it and approve payment. Then check with  day_pass_status  in the same MCP session. Status exposes activation and expiry, n","note":"Text truncated to 8000 chars. Full document is 20514 chars.","url":"https://zambo.dev/guides/x402-agent-payments/","word_count":2972},"receipt_schema_version":"0.4","side_effects":{"declaration_hash":"sha256:45aad38f3aa982b9aafe92ecb416ebe98791eddbaf8ab6df0bd08605b7c1bfee","declared":["none"],"schema_version":"zambo-side-effects/1"},"tool":{"name":"pdf_extract","scope":"public","version":"4.0.0"}}","canonical_bytes_withheld_for_privacy":false,"canonical_byte_length":8902,"verification_status":"verified","session_trail":[{"tool":"live_price","status":"completed","args_hash":"sha256:959adbd840930a89bf6da6c9bd5067827d4bf1fd109027271ea88002ba0847b4","timestamp":"2026-10-20T01:29:31.699Z","receipt_uuid":"a35094c4-fed9-43f9-b883-be7db3823c24"},{"tool":"prompt_shield","status":"completed","args_hash":"sha256:31090e49b98e8560ed8a8ff4d87e5f4f5a0e83e987dc57f9813a903e5185384f","timestamp":"2026-10-20T01:29:31.801Z","receipt_uuid":"1a8a028c-fc04-461c-b71a-f707f5ad5f96"},{"tool":"pdf_extract","status":"completed","args_hash":"sha256:21a96dfe0e09a066e27b03383ee47a4f099681fb7c160eb3ee9d7934a1baf84f","timestamp":"2026-10-20T01:29:32.419Z","receipt_uuid":"d9b1c60b-fc84-474f-a31f-36f81b597d59"}],"result_preview":"{\"url\":\"https://zambo.dev/guides/x402-agent-payments/\",\"content_type\":\"text/html\",\"word_count\":2972,\"extracted_text\":\"X402 day pass payments for funded AI agents | Zambo\\n\\n← All guides\\n\\nAgent payments · Zambo\\n\\nx402 Day Pass payments for funded AI agents\\n\\nx402 agent payments, live on this site  The endpoint below answers a real x402 challenge today. A funded agent using a compatible x402 client may pay for its own Day Pass within its spending policy. Do not submit a payment merely to inspect the challenge.\\n\\ncurl -i https://zambo.dev/api/x402/day-pass\\n\\nThe GET returns HTTP 402. This is the checked response shape, limited to the challenge's resource and payment requirement fields. Fetch a fresh challenge before authorizing payment.\\n\\n{\\n\\n&quot;x402Version&quot;: 2,\\n\\n&quot;resource&quot;: {\\n\\n&quot;url&quot;: &quot;https://zambo.dev/api/x402/day-pass&quot;\\n\\n},\\n\\n&quot;accepts&quot;: [\\n\\n{\\n\\n&quot;scheme&quot;: &quot;exact&quot;,\\n\\n&quot;amount&quot;: &quot;990000&quot;,\\n\\n&quot;network&quot;: &quot;eip155:8453&quot;,\\n\\n&quot;asset&quot;: &quot;0x8335…2913&quot;,\\n\\n&quot;payTo&quot;: &quot;0xb753…b9AC&quot;\\n\\n}\\n\\n]\\n}\\n\\nAfter settlement, keep the spend receipt and access expiry with the subsequent tool receipt. The paid call's work enters the same verifiable receipt trail as a free Zambo call; a payment alone is not evidence that the work succeeded. x402 is a payment convention Zambo implements, not a Zambo invention.  A receipt proves the saved result was not changed since it was saved. It never proves the answer was right and never proves an external event happened.\\n\\nZambo x402 returns a machine-readable HTTP 402 challenge for the $0.99, 24-hour USDC-on-Base Day Pass. A funded agent may pay for its own Day Pass when its configured spending policy permits; users can instruct it not to self-pay or to ask first. This permission applies only to the Day Pass, not Zambo Pass or ProvibeCode. The Day Pass is time-based, not per-call.\\n\\nTry the Zambo demo  ·  Explore Zambo\\n\\nHow Zambo does it\\n\\nZambo publishes its payment contract at  /.well-known/x402 . Request  GET /api/x402/day-pass  without payment to receive the live x402 challenge for $0.99 USDC on Base. If the agent is funded and its spending policy allows this purchase, an official client signs the EIP-3009 authorization and retries  POST /api/x402/day-pass  with the proof. Respect any user instruction not to self-pay or to ask first. The server verifies settlement before activating the 24-hour pass. MCP callers can use  day_pass_activate  for the same challenge flow and bind it to the current job with  _session_id .\\n\\nOfficial TypeScript client\\n\\nmatching package versions on October 4, 2026:  @x402/core ,  @x402/fetch , and  @x402/evm  2.28.0. The client automatically handles the challenge after you invoke it. The example enforces the Base USDC asset and 0.99 USDC amount in the x402 hook. It submits a real payment on Base, so use it only with a funded agent and within its configured spending policy. Users may instruct the agent not to self-pay or to ask first. Keep the wallet key in a secret store.\\n\\nnpm install @x402/core@2.28.0 @x402/fetch@2.28.0 @x402/evm@2.28.0 viem\\n\\nimport { wrapFetchWithPayment, x402HTTPClient } from \\\"@x402/fetch\\\";\\nimport { x402Client } from \\\"@x402/core/client\\\";\\nimport { ExactEvmScheme } from \\\"@x402/evm/exact/client\\\";\\nimport { privateKeyToAccount } from \\\"viem/accounts\\\";\\n\\nconst key = process.env.EVM_PRIVATE_KEY;\\nif (!key || !/^0x[a-fA-F0-9]{64}$/.test(key)) throw new Error(\\\"Load the wallet key from a secret store.\\\");\\nconst signer = privateKeyToAccount(key as \\\\`0x${string}\\\\`);\\n\\nconst client = new x402Client();\\nclient.register(\\\"eip155:8453\\\", new ExactEvmScheme(signer));\\nclient.onBeforePaymentCreation(async ({ selectedRequirements }) => {\\n\\nconst correctUsdc = selectedRequirements.asset.toLowerCase() === \\\"0x8335…2913\\\";\\n\\nif (selectedRequirements.network !== \\\"eip155:8453\\\" || !correctUsdc || String(selectedRequirements.amount) !== \\\"990000\\\") {\\n\\nreturn { abort: true, reason: \\\"This example only permits the 0.99 USDC Base Day Pass.\\\" };\\n\\n}\\n});\\nconst fetchWithPayment = wrapFetchWithPayment(fetch, client);\\nconst httpClient = new x402HTTPClient(client);\\nconst jobId = process.env.ZAMBO_JOB_ID; // Optional: bind the pass to this existing job.\\nconst body = jobId ? { _session_id: jobId } : {};\\nconst response = await fetchWithPayment(\\\"https://zambo.dev/api/x402/day-pass\\\", {\\n\\nmethod: \\\"POST\\\",\\n\\nheaders: { \\\"Content-Type\\\": \\\"application/json\\\" },\\n\\nbody: JSON.stringify(body),\\n});\\nconst result = await httpClient.processResponse(response);\\n\\nif (result.paymentStatus !== \\\"settled\\\" || !response.ok) {\\n\\nconsole.error(\\\"Payment or activation was refused; inspect the refusal receipt and do not retry blindly.\\\");\\n\\nprocess.exitCode = 1;\\n} else {\\n\\nconst payload = result.body && typeof result.body === \\\"object\\\" ? result.body as Record<string, unknown> : {};\\n\\nconst accessKey = payload.access_key;\\n\\nconst expiresAt = payload.expires_at;\\n\\nconst spendReceipt = payload.spend_receipt;\\n\\nif (typeof accessKey !== \\\"string\\\" || !accessKey || typeof expiresAt !== \\\"string\\\" || !spendReceipt) {\\n\\nthrow new Error(\\\"Activation response is missing its access key, expiry, or spend receipt.\\\");\\n\\n}\\n\\n// Keep accessKey in memory or a secret store. Never print it or put it in a URL.\\n\\n// Resume the same job with X-Zambo-Key (or _zambo_key) before expiresAt.\\n\\nconsole.log(\\\"Day Pass active until\\\", expiresAt, \\\"settlement\\\", payload.payment?.transaction);\\n}\\n\\nOfficial Python client\\n\\nThe official PyPI package was  x402  2.25.0 when checked on October 4, 2026. Its HTTP wrapper handles the challenge and retry. This submits a real payment on Base, so use it only with a funded agent and within its configured spending policy. Users may instruct the agent not to self-pay or to ask first. 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