Breaking down: "How long do x402 payments take to finalize?"

Identified 2 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 2/3 positive proposal(s): 2 cached + 0 fresh, predicting 2/2 claim(s) above the evidence floor with $0.000000/$0.020000 fetch USDC reserved.

Free-preview pre-check maps an actionable source to every sub-claim (2/2); paid reading may proceed within the budget.

Agent spend wallet ready: 0x29028Fe1122E17Fe7863A22701e863FE4DaE1aFB (balance sufficient)

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

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

Sub-claim "How long do x402 payments take to finalize, as stated in the…": 50% covered by S1, S2 — S1 gives a concrete finalization figure for x402 batched settlements on Arc (~180ms median, p95 240ms) and notes sub-second finality, but does not distinguish authorization, confirmation, and settlement stages. S2 gives a conflicting ~15s settlement figure tied to Ethereum L1 block time, also without stage distinctions. Together they provide partial timing answers but no explicit authorization/confirmation/settlement breakdown.

Sub-claim "Does the finalization time for x402 payments vary depending …": 30% covered by S1, S2 — S1 contrasts Arc batched settlement (sub-second, not block-time-bound) with Ethereum L1, and S2 describes an Ethereum L1-like ~15s settlement, giving topical context that timing may differ by rail. However, no explicit comparison across Lightning Network, on-chain, or stablecoin rails is provided, so the requested rail-by-rail differences are not answered.

Coverage is below 0.5 for the rail-variation sub-claim and only partial for the stage-distinction sub-claim. The Stablecoin Ledger source ($0.003) directly addresses stablecoin settlement finality, and the Onchain Micropayments Digest ($0.005) covers batched settlement economics/timing; both fit the $0.02 remaining budget and are the most relevant affordable gaps. Other skipped sources are off-topic or only tangentially related.

Filling gap — buying Stablecoin Ledger — Why USDC settles instantly onchain ($0.003)…

Paid $0.003 to Stablecoin Ledger — Why USDC settles instantly onchain (settled 69f34b85-8…) — S3

Filling gap — buying Onchain Micropayments Digest — Nanopayments and the $0.000001 floor ($0.005)…

Paid $0.005 to Onchain Micropayments Digest — Nanopayments and the $0.000001 floor (settled bccc0fbc-6…) — S4

Final check — "How long do x402 payments take to finalize, as stated in the…": 60% assessed by S1, S2

Final check — "Does the finalization time for x402 payments vary depending …": 20% assessed by S1

Final coverage assessment — S1 directly answers the first sub-claim with a specific finalization time (~180 ms median, p95 240 ms) for x402 batched settlements on Arc, and distinguishes confirmation from block-time-bound L1 transactions. S2 gives a conflicting ~15 second settlement estimate but is framed as a reading/view, not protocol documentation, and does not distinguish authorization/confirmation/settlement stages. S3 and S4 provide only general stablecoin or nanopayment context, not x402 finalization timing. For the second sub-claim, no source compares finalization times across payment rails such as Lightning, on-chain, or stablecoin; S1 mentions Arc/Gateway batching and Ethereum L1 contrast, but does not provide rail-by-rail differences for x402. The assessment does not establish a complete supported answer for every requested part.

Synthesizing a grounded answer from 4 source(s)…

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

⚖️ Sources disagreed on x402 payment finalization time — S1 x402 batched settlements finalize in roughly 180ms (median 178ms, p95 240ms) via Arc BFT consensus and Gateway batching, not block-time-bound. vs S2 x402 payments take about 15 seconds to settle, similar to Ethereum L1 block time, because each payment is its own transaction waiting to be mined. → reported preference: S1 (S1 provides specific measured statistics (median 178ms, p95 240ms across thousands of calls) and is internally consistent with its described BFT/Gateway batching architecture, whereas S2 offers only an approximate figure based on an Ethereum-L1 per-transaction model that S1 explicitly says does not apply.)

Verified — S1 supports claim 1 at 80%: “Across thousands of submitBatch calls on Arc testnet, x402 batched settlements finalize in roughly 180 milliseconds (measured median 178ms, …”

Verified — S1 supports claim 1 at 70%: “Arc's BFT consensus delivers sub-second finality, so a Gateway-batched payment confirms in well under a quarter second — it is not block-tim…”

Verified — S2 supports claim 1 at 80%: “In our reading, an x402 payment takes about 15 seconds to settle, similar to an Ethereum L1 block time, because each payment is its own tran…”

Below reward gate — S3 supports claim 2 at 20%: “USDC is a fully-reserved dollar stablecoin that settles peer-to-peer onchain in seconds.”

Below reward gate — S4 supports claim 2 at 20%: “Nanopayments push the minimum economical payment to about $0.000001 by signing off-chain authorizations and settling them in batches.”

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

Drafted answer citing 2 source(s)

Confidence: Low — 1 sub-claim remains below the evidence threshold.

Arc Settlement Benchmarks contributed 50% → reward $0.01

Web Payments Review contributed 50% → reward $0.01

Settled $0.01 citation reward → Arc Settlement Benchmarks (92703495-a…)

Settled $0.01 citation reward → Web Payments Review (2336b0a1-d…)

Done. Spent $0.028 across 4 confirmed/simulated payment(s) to creators.