Breaking down: "What is the role of EIP-712 signatures in x402 payment authorization?"

Identified 1 research target(s) to investigate; these are not established facts

Deep mode: up to 4 paid/cached reads plus one bounded gap-expansion pass when needed.

Discovered 21 verified source(s)

Recalled 60 past runs on this subject — how these sources performed when they were available.

ERC-8004 reputation loaded — composite scores on this subject.

Claim-aware portfolio selected 2/2 positive proposal(s): 2 cached + 0 fresh, predicting 1/1 claim(s) above the evidence floor with $0.000000/$0.025000 fetch USDC reserved.

Free-preview pre-check maps an actionable source to every sub-claim (1/1); paid reading may proceed within the budget.

Agent spend wallet ready: 0x72449d71ea6a955aD4d4d22C2fDAcdFCA622b9BE (balance sufficient)

Reused cached Agent Economy Weekly — x402 turns HTTP 402 into an agent payment rail (free) — S1

Reused cached Arc Settlement Benchmarks — Measuring x402 settlement latency on Arc (free) — S2

Sub-claim "What is the role of EIP-712 signatures in x402 payment autho…": 10% covered by S1 — S1 states that in x402 the client 'signs a payment authorization and retries,' giving topical context that a signature authorizes payment, but it never mentions EIP-712, typed structured data, or any specifics of the signing scheme. No supplied passage addresses EIP-712's role, so the requested answer is essentially absent.

Coverage is below 0.5 and the core term (EIP-712) is unaddressed. The only skipped source plausibly touching x402 payment authorization mechanics is the Keryx Engineering first-party note on recovering a paid research job without signing a second payment, which may describe x402 signing/authorization behavior; at $0.002 it fits the $0.025 budget. Other skipped sources concern settlement timing, USDC, idempotency, regulation, or unrelated topics and are unlikely to answer the EIP-712 question, so they are not recommended.

Filling gap — buying Keryx Engineering (first-party) — Recovering a Keryx paid research job ($0.002)…

Paid $0.002 to Keryx Engineering (first-party) — Recovering a Keryx paid research job (settled 852af58f-0…) — S3

Final check — "What is the role of EIP-712 signatures in x402 payment autho…": 10% assessed by S1, S3

Final coverage assessment — The supplied passages describe x402 as a payment rail where a client signs a payment authorization and retries, and one first-party note mentions signing once before submission, but none of the sources mention EIP-712, typed structured data, or the specific role of EIP-712 signatures in x402 payment authorization. The question asks specifically about EIP-712 signatures, and no passage provides that answer. The assessment does not establish a complete supported answer for every requested part.

Synthesizing a grounded answer from 3 source(s)…

Relevance review returned; only checked excerpts can retain support, and review cannot raise it.

Below reward gate — S1 supports claim 1 at 30%: “A server responds 402 with machine-readable payment requirements; the client signs a payment authorization and retries.”

Below reward gate — S3 supports claim 1 at 10%: “The buy command obtains a fresh quote, checks the payment policy again, writes a durable job journal, signs once and submits once.”

Below reward gate — S3 supports claim 1 at 20%: “Before signing, the journal records the normalized request, payment terms, nonce and deterministic job identifier.”

Rejected 0 invalid evidence span(s) and 2 unsupported citation marker(s); rejected markers cannot receive citation rewards.

No citation passed the evidence gate — the $0.025000 citation pool stays unspent; settled access tolls still stand.

Drafted answer citing 0 source(s)

Confidence: Low — no citation passed the evidence gate.

Done. Spent $0.002 across 1 confirmed/simulated payment(s) to creators.