What is the role of EIP-712 signatures in x402 payment authorization?

Archived dispatch

Lowconfidence— no citation passed the evidence gate

9/9/2026, 11:19:26 AM · llm:deepseek:deepseek-v4-flash

The dispatch, itemised.

§ IThe decision$0 / $0.03

Decompose

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

Decompose

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

Decompose

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

Discover

Discovered 21 verified source(s)

Discover

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

Discover

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

Pre-check

Claim-aware portfolio selected 3/3 positive proposal(s): 3 cached + 0 fresh, predicting 1/1 claim(s) above the evidence floor with $0.000000/$0.015000 fetch USDC reserved.

Pre-check

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

DecideCACHE

Arc Settlement Benchmarks — Measuring x402 settlement latency on Arc$0.003 · EV 60%

Cached source about x402 settlement on Arc, likely discusses authorization and signatures. Relevant to claim 0. — selected for the claim-aware evidence portfolio (targets claim 1; 0 fetch USDC, 1 attention slot).

DecideCACHE

Web Payments Review — How long do x402 payments take to finalize?$0.002 · EV 60%

Cached source about x402 payment finalization, likely covers authorization flow including EIP-712. Relevant to claim 0. — selected for the claim-aware evidence portfolio (targets claim 1; 0 fetch USDC, 1 attention slot).

DecideCACHE

Agent Economy Weekly — x402 turns HTTP 402 into an agent payment rail$0.004 · EV 60%

Cached source discusses x402 as an agent payment rail, likely covering authorization mechanisms including EIP-712 signatures. Relevant to claim 0. — selected for the claim-aware evidence portfolio (targets claim 1; 0 fetch USDC, 1 attention slot).

DecideSKIP

Stablecoin Ledger — Why USDC settles instantly onchain$0.003 · EV 10%

Preview focuses on USDC settlement speed, not EIP-712 signatures or x402 authorization. No relevant content.

DecideSKIP

Onchain Micropayments Digest — Nanopayments and the $0.000001 floor$0.005 · EV 10%

Preview about nanopayments and batching, not EIP-712 signatures or x402 authorization. No relevance.

DecideSKIP

Distributed Systems Notes — Idempotency keys prevent double-spends$0.003 · EV 10%

Preview about idempotency keys, not EIP-712 signatures or x402. No relevance.

DecideSKIP

Garden & Soil Monthly — Building a no-dig raised bed$0.002 · EV 0%

Gardening content, completely irrelevant.

DecideSKIP

Retro Game Hardware — Recapping a 1990s console$0.002 · EV 0%

Retro gaming hardware, irrelevant.

DecideSKIP

Stripe Blog — Rethinking risk in the age of AI$0.002 · EV 10%

Preview is an event promotion about AI and risk, not EIP-712 or x402. No relevance.

DecideSKIP

Ethereum Foundation Blog — The triage is the product: running AI agents against Ethereum's protocol code$0.002 · EV 10%

Preview about AI agents triaging Ethereum code, not EIP-712 signatures or x402. No relevance.

DecideSKIP

Cointelegraph.com News — Crypto payments barely register among euro area merchants, ECB finds$0.002 · EV 10%

Preview about ECB survey on crypto payments, not EIP-712 or x402. No relevance.

DecideSKIP

Latent.Space — Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web$0.004 · EV 10%

Preview about ontologies for AI agents, not EIP-712 or x402. No relevance.

DecideSKIP

Simon Willison's Weblog — Anthropic’s best AI model struggles to attract users as cheaper tools thrive$0.003 · EV 10%

Metadata only, title about AI model adoption, not EIP-712 or x402. No relevance.

DecideSKIP

Hugging Face - Blog — Give Your Coding Agents a Memory You Own$0.003 · EV 10%

Metadata only, title about coding agents memory, not EIP-712 or x402. No relevance.

DecideSKIP

Vitalik Buterin's website — Low-risk defi can be for Ethereum what search was for Google$0.004 · EV 10%

Metadata only, title about DeFi and Ethereum, not EIP-712 or x402. No relevance.

DecideSKIP

The Coinbase Blog - Medium — In response to the Wall Street Journal$0.003 · EV 10%

Preview about Coinbase response to WSJ, not EIP-712 or x402. No relevance.

DecideSKIP

Decrypt — Putin Signs Russia's First Crypto Law: Trading Is Legal, Payments Stay Banned$0.002 · EV 10%

Preview about Russia crypto law, not EIP-712 or x402. No relevance.

DecideSKIP

CoinDesk: Bitcoin, Ethereum, Crypto News and Price Data — Bitcoin and Ether bears get decimated amid 'squeeze-led' rally and Musk's X wants to pay creators in stablecoins: Crypto week in 5 stories$0.002 · EV 10%

Preview about crypto rally and stablecoins, not EIP-712 or x402. No relevance.

DecideSKIP

Inner Axiom — The Codex — ISIS: The Godess, From An Esoteric Perspective$0.002 · EV 0%

Esoteric content, irrelevant.

DecideSKIP

Conzit Labs — Decoding DeFi: The Role and Rewards of Liquidity Providers$0.002 · EV 10%

Preview about DeFi liquidity providers, not EIP-712 or x402. No relevance.

DecideSKIP

Keryx Engineering (first-party) — Recovering a Keryx paid research job$0.002 · EV 10%

First-party engineering notes about buyer recovery, not EIP-712 signatures or x402 authorization. No relevance.

Fetch

Agent spend wallet ready: 0x29028Fe1122E17Fe7863A22701e863FE4DaE1aFB (balance sufficient)

Fetch

Reused cached Arc Settlement Benchmarks — Measuring x402 settlement latency on Arc (free) — S1

Fetch

Reused cached Web Payments Review — How long do x402 payments take to finalize? (free) — S2

Fetch

Reused cached Agent Economy Weekly — x402 turns HTTP 402 into an agent payment rail (free) — S3

Re-evaluate

Sub-claim "What is the role of EIP-712 signatures in x402 payment autho…": 10% covered by S3 — S3 mentions that the client 'signs a payment authorization' but does not specify EIP-712 or its role. Other sources discuss settlement latency and general x402 mechanics without addressing EIP-712 signatures. Thus, only topical context is provided, not an answer to the specific role of EIP-712 signatures.

Re-evaluate

No skipped source appears to directly address EIP-712 signatures in x402. The available skipped sources cover topics like stablecoin settlement, nanopayments, idempotency, and unrelated subjects. None seem likely to fill the gap on EIP-712's role. Therefore, no additional sources are recommended.

Sufficiency

Final check — "What is the role of EIP-712 signatures in x402 payment autho…": 0% assessed

Sufficiency

Final coverage assessment — The supplied passages discuss x402 settlement latency and general payment flow, but none mention EIP-712 signatures or their role in payment authorization. Therefore, the sub-claim is not covered at all.

Synthesize

Synthesizing a grounded answer from 3 source(s)…

Evidence

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

Evidence

Below reward gate — S3 supports claim 1 at 10%: “A server responds 402 with machine-readable payment requirements; the client signs a payment authorization and retries.”

Evidence

Rejected 0 invalid evidence span(s) and 1 unsupported citation marker(s); rejected markers cannot receive citation rewards.

Evidence

No citation passed the evidence gate — the $0.015000 citation pool stays unspent; settled access tolls still stand.

Synthesize

Drafted answer citing 0 source(s)

Verdict

Confidence: Low — no citation passed the evidence gate.

Done

Done. Spent $0 across 0 confirmed/simulated payment(s) to creators.

§ IIIThe settlementweighted · USDC on Arc

Payouts to cited creators appear here.

§ IIThe reading0 cited

Lowconfidence— no citation passed the evidence gatedeep researchpreview plan 1/1 claimsportfolio 3/3 · evidence 0%

The provided sources do not mention EIP-712 signatures in the context of x402 payment authorization. Source S3 describes that in x402, a server responds with HTTP 402 and machine-readable payment requirements, and the client signs a payment authorization and retries. However, the specific cryptographic scheme (e.g., EIP-712) is not specified. Therefore, the role of EIP-712 signatures in x402 payment authorization is not addressed by the given sources.

Evidence ledger — quotes verified before rewards

What is the role of EIP-712 signatures in x402 payment authorization?
0%
No reward-qualifying evidence

Helpful?

Spent$0

To creators100%

Decisions0 bought · 3 cached · 18 skipped

llm:deepseek:deepseek-v4-flash

Portable research receipt

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