{"assessments":[],"deployments":[],"fuzz":[],"identity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"interpretation":"Records acceptance and evidence. Neither completion nor an AI assessment establishes correctness, safety, or independent review.","jobId":"e2747f39-c387-4c14-aca4-8d70b1048d4a","kind":"skill:research-report","nodes":[{"acceptedSubmissionHash":"78d5a8c2077c8b30cbe16098a015e87796358f4469b35279ea8cc2724606fb5f","dependsOn":[],"execution":{"network":true,"profile":"none","requires":["network"],"skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","tools":[]},"key":"research_report","kind":"code","role":"implement","skillHash":"3ddca93330036359dd721585e58e67820336a0398b7927b3c89369d6134f30f6","skillId":"research-report","state":"accepted"}],"objective":"Write a sourced field guide for developers building an autonomous agent that pays for API work with x402 v2 'exact' payments settled through Permit2 on Ethereum mainnet. Explain the full message flow (price quote, HTTP 402 challenge, the Permit2 witness signature, a second EIP-712 signature that binds the payment to the quote, and settlement by a facilitator that pays the gas), what each signature authorizes and why it cannot be replayed elsewhere, how nonces, deadlines and quote expiry interact, and the concrete ways a payment fails (missing Permit2 allowance, insufficient balance, an expired window, a payment hash that does not match, a reused nonce). End with a one-page pre-flight checklist for client authors and a short section on the spending controls an agent operator should enforce: per-payment caps, bounded allowances and a dedicated hot wallet with a small balance.","parentJobId":null,"planHash":"4a7e770efedd983819009d70354b5ee25108503d9aa57e0bb38418e3cfb00685","previousHash":"0000000000000000000000000000000000000000000000000000000000000000","projectId":"e2747f39-c387-4c14-aca4-8d70b1048d4a","publication":{"commit":null,"deliveredAt":null,"repoUrl":null},"receiptIdentity":{"adapter":"0xde152afb7db5373f34876e1499fbd893a82dd336","chainId":1,"collection":"0x0000ec93127baa929e58e97dd0095a2bfb38ec1d","registry":"0x8004a169fb4a3325136eb29fa0ceb6d2e539a432"},"registry":"0xb6d0a187b050fa5bb0b87033a203f37becf4a775","research":[],"schema":"identitymd-work-v1","signals":[{"agentId":"51336","feedbackHash":"d301b71c3c4ec478f1bf6c5c38f29206762824108a49ca5a61d427999964d63e","nodeKey":"research_report","submissionHash":"78d5a8c2077c8b30cbe16098a015e87796358f4469b35279ea8cc2724606fb5f","tag1":"verification:structural","tag2":"acceptance-v2","value":1}],"site":null,"snapshotHash":"9d86c76121bfddbc6a488011920653400137a94700b26f8b4de8e4b9009cc376","state":"completed","submissions":[{"artifacts":[{"bytes":37156,"hash":"2181cc830185a445cb2e9881453f12d67de2cea92fd0977ca9a808a775a4ec99","mediaType":"text/markdown","name":"report","path":"artifacts/report.md"}],"attempt":1,"bundleHash":"14e654d2482604fdd6e03ab1e628e056c050372e143960e76f9987aabc06ff58","device":"00d95fd75f8b224c","findings":[],"hash":"78d5a8c2077c8b30cbe16098a015e87796358f4469b35279ea8cc2724606fb5f","nodeId":"5cd3d988-5531-4a60-9111-81423c8691e2","outcome":"completed","summary":"`artifacts/` is git-ignored by the environment and I was told not to force-add outputs, so nothing is committed. Both files are in `artifacts/` for the daemon to upload.\n\nI've written the field guide to `artifacts/report.md`, with a short `README.md` beside it. One thing first: part of the brief doesn't match the x402 standard. The standard x402 v2 `exact`/Permit2 flow has no second client-signed EIP-712 signature that binds the payment to the quote, and no \"payment hash.\"\n\n**What the specs actually have:**\n- **One client signature:** the Permit2 witness signature. It is the only thing the client signs.\n- **A second EIP-712 signature exists, but the server signs it.** It's the optional signed Offer in the `offer-receipt` extension. Nothing on chain checks it, and it isn't tied to the client's signature.\n- **The nearest thing to a \"payment hash\"** is either in a different scheme (`auth-capture`) or in the repository's test code.\n\nThe report says this plainly in §0.1. It then shows how to get most of the quote-binding effect from standard pieces: the signed Offer, the `accepted` echo, and `payment-identifier`. If a particular facilitator requires a client-signed quote binding, it's vendor-specific and you'll need its format from that vendor (open question Q1).\n\n**What the report covers:**\n- **Message flow:** the 402 challenge, the exact Permit2 type string and domain, how the reference client fills each field, what the facilitator verifies (including a 6-second deadline buffer), and settlement with the facilitator paying gas.\n- **What the signature authorizes and why it can't be replayed:** a table covering chain, spender, recipient, amount, token, nonce and deadline. It also names what is *not* bound: the resource URL, which request it's for, and which facilitator submits it.\n- **Nonces, deadlines and quote expiry:** Permit2 nonces are unordered and shared across everything the wallet signs, a failed settlement doesn't use up the nonce, and outstanding signatures can be cancelled. It includes a rule for choosing the deadline from the quote timeout and the offer expiry.\n- **Failure modes:** missing allowance, insufficient balance, expired window, mismatch and reused nonce, each with the reference facilitator's error code and a fix.\n- **Checklist and spending controls:** a one-page pre-flight checklist, plus operator controls. One thing to watch: the reference SDK's approval helper grants an unlimited (`MAX_UINT256`) allowance by default, which the report says to override.\n\n**Evidence:** every claim is tagged as fact, inference, uncertain or open question. Facts cite pinned commits of the x402 specs and reference code (as of today) and Uniswap Permit2. I also read Ethereum mainnet directly: both Permit2 and the x402 exact proxy are deployed, and the proxy points at the standard Permit2 address. All cited URLs resolve.\n\n**Limits:** I made no live payment and didn't query any production facilitator, so I don't know which ones support mainnet today or what they charge (open questions Q2 and Q3). The spec also disagrees with itself on whether a missing allowance returns HTTP 412 or 402 (noted as U4). No one has independently reviewed the report.","treeHash":"4b825dc642cb6eb9a060e54bf8d69288fbee4904","usage":{"cachedInputTokens":2830376,"inputTokens":70,"model":"claude-opus-5-5","outputTokens":32931,"runtime":"claude","turns":41,"wallClockMs":414512}}],"verification":[{"checks":[],"detail":"paths and tree verified; no suite was run for this kind of work","evaluation":"structural","profile":"none","status":"accepted","submissionHash":"78d5a8c2077c8b30cbe16098a015e87796358f4469b35279ea8cc2724606fb5f","verifiedTreeHash":"4b825dc642cb6eb9a060e54bf8d69288fbee4904","verifierVersion":"0.1.0+1b3bcb5e"}]}