How long do x402 payments take to finalize?
9/18/2026, 2:36:36 PM · llm:mimo:mimo-v2.5
The dispatch, itemised.
Breaking down: "How long do x402 payments take to finalize?"
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 2/4 positive proposal(s): 2 cached + 0 fresh, predicting 1/1 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 (1/1); paid reading may proceed within the budget.
Directly addresses the question with measured x402 settlement latency on Arc testnet. Cached and free. Best candidate for finalization time data. — selected for the claim-aware evidence portfolio (targets claim 1; 0 fetch USDC, 1 attention slot).
Title exactly matches the question, covers end-to-end settlement timing for x402. Cached and free. Provides broader commentary on similar payment rails. — selected for the claim-aware evidence portfolio (targets claim 1; 0 fetch USDC, 1 attention slot).
Agent Economy Weekly covers x402 standard as a payment rail, likely to mention settlement timing. Strong reputation on subject. Cached and free. — the claim-aware portfolio chose a stronger, less redundant set inside the 4-source attention and $0.020000 fetch-budget caps, so this proposal stays unspent.
Stablecoin Ledger discusses USDC settlement speed ('seconds with finality'), relevant to x402 finalization if using USDC. Cached and free. — the claim-aware portfolio chose a stronger, less redundant set inside the 4-source attention and $0.020000 fetch-budget caps, so this proposal stays unspent.
Coinbase Blog on reconciliation doesn't address x402 finalization time directly. Cached but low relevance despite stablecoin tag.
Stripe Blog article is about solo founders, not x402 settlement timing. Cached but not relevant despite Stripe's payment expertise.
Cointelegraph article is about crypto payments adoption among merchants, not x402 finalization time. Cached but tangential.
Decrypt article is about Russia's crypto law, not x402 settlement timing. Cached but not relevant.
CoinDesk article is about dollar vs euro stablecoin adoption, not x402 finalization time. Cached but tangential.
Onchain Micropayments Digest covers nanopayment floor, not x402 finalization time. Cached but not directly relevant.
Distributed Systems Notes on idempotency keys don't address x402 finalization time. Cached but not relevant.
Retro Game Hardware is completely off-topic. Cached but no relevance.
Inner Axiom is esoteric content, completely off-topic. Not cached, skip.
Conzit Labs article is about computer vision, completely off-topic. Cached but no relevance.
Simon Willison's Weblog is about AI model adoption, not x402 payments. Not cached, low relevance.
Hugging Face Blog is about AI tutors, not x402 payments. Not cached, no relevance.
Vitalik Buterin's website is about DeFi, not x402 finalization time. Not cached, tangential at best.
Keryx Engineering first-party notes on buyer recovery might reference x402 payment mechanics. Cached and free. Has tags for x402 and settlement. — cached bytes are free, but this read does not clear the attention gate (EV 0.40, minimum 0.45, with a required claim target).
Latent.Space is about AI ontologies, not x402 payments. Cached but not relevant.
Garden & Soil Monthly is about gardening, completely off-topic. Cached but no relevance.
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 "What is the finalization time for x402 payments as implement…": 0% covered — The gathered sources discuss x402 finalization times in general contexts: S1 mentions Arc testnet batched settlements finalizing in ~180ms, and S2 mentions about 15 seconds similar to Ethereum L1 block time. Neither source specifically addresses Keryx's implementation of x402 payments. There is no information about Keryx's specific finalization time.
The sub-claim specifically asks about Keryx's implementation, but none of the gathered sources provide this information. The skipped source 'Keryx Engineering (first-party) — Recovering a Keryx paid research job' is the most relevant as it's directly from Keryx and might contain details about their payment implementation, including finalization times. This source costs 0.002, which fits within the remaining budget of 0.02. Other skipped sources are not relevant to Keryx's specific implementation.
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 36844cf0-9…) — S3
Final check — "What is the finalization time for x402 payments as implement…": 0% assessed
Final coverage assessment — The user asks for finalization time of x402 payments as implemented by Keryx. The gathered sources include a general benchmark on Arc testnet (S1) showing ~180ms finality, a general review (S2) claiming ~15 seconds (Ethereum L1 time), and a Keryx-specific document (S3) that is excerpted but contains only introductory text about recovery, not finalization time. No source explicitly states Keryx's finalization time. S1 and S2 are not Keryx-specific. Therefore, the sub-claim lacks direct support. 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.
⚖️ Sources disagreed on Finalization time for x402 payments — S1 Roughly 180 milliseconds on Arc testnet. vs S2 About 15 seconds, similar to Ethereum L1 block time. → reported preference: S1 (S1 provides specific, measured performance data from a testnet deployment of a BFT consensus system, while S2 presents a general comparison to Ethereum L1 without citing implementation details. The context in S1 is more specific to a particular x402 implementation.)
Verified — S1 supports claim 1 at 100%: “Across thousands of submitBatch calls on Arc testnet, x402 batched settlements finalize in roughly 180 milliseconds (measured median 178ms, …”
Verified — S2 supports claim 1 at 50%: “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…”
Rejected 0 invalid evidence span(s) and 1 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 (f033a340-1…)
Settled $0.01 citation reward → Web Payments Review (c6b676c3-5…)
Done. Spent $0.022 across 3 confirmed/simulated payment(s) to creators.
Arc Settlement Benchmarks
batched
Web Payments Review
batched
> ⚠ Low confidence — 1 sub-claim remains below the evidence threshold within budget. Treat this as provisional.
The finalization time for x402 payments depends on the settlement platform. On Arc's testnet, batched x402 settlements finalize in roughly 180 milliseconds (median 178ms, p95 240ms) . However, other implementations may use different blockchains; for instance, one view describes an x402 payment taking about 15 seconds to settle, similar to an Ethereum L1 block time . The Keryx source does not provide information on payment finalization times, as it focuses on a recovery process.
Evidence ledger — quotes verified before rewards
What is the finalization time for x402 payments as implemented by Keryx?
0%“Across thousands of submitBatch calls on Arc testnet, x402 batched settlements finalize in roughly 180 milliseconds (measured median 178ms, p95 240ms).” [S1] Measuring x402 settlement latency on Arc
“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 transaction waiting to be mined into a block.” [S2] How long do x402 payments take to finalize?
Footnotes — each one pays its author
- 1Measuring x402 settlement latency on ArcArc Settlement Benchmarks50%+$0.01
- 2How long do x402 payments take to finalize?Web Payments Review50%+$0.01
Portable research receipt
Take the evidence trail with you
One deterministic JSON bundle binds the answer, visible decisions, exact article versions, claim evidence and a Circle-settlement snapshot under SHA-256. Retain the digest to detect later changes; the self-check is not a publisher or Keryx signature.
Exact receipt still current
2 exact cited article versions still match Keryx's current index.
Carries this dispatch’s question as context — never its answer. The next dispatch is read from sources bought for it.