Breaking down: "What is the Arc blockchain and what currency does it use?"

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 23 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 3/3 positive proposal(s): 3 cached + 0 fresh, predicting 2/2 claim(s) above the evidence floor with $0.000000/$0.010000 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 CoinDesk: Bitcoin, Ethereum, Crypto News and Price Data — How Circle’s institutional Arc blockchain got taken over by memecoins on day one (free) — S1

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

Reused cached Stripe Blog — New currency capabilities for global businesses to cut FX costs (free) — S3

Sub-claim "What is the Arc blockchain?": 30% covered by S1, S2 — S1 identifies Arc as Circle's institutional blockchain (an L2) and S2 adds that Arc uses BFT consensus with sub-second finality and supports x402 batched settlements. This gives topical context about Arc's nature, but no source explicitly defines what the Arc blockchain is (its purpose, architecture, or positioning).

Sub-claim "What currency does the Arc blockchain use?": 0% covered — No supplied passage states the currency or token used by Arc. S1 mentions memecoins traded on it but does not identify Arc's native/settlement currency; S2 mentions x402 payments but not the currency; S3 is about Stripe FX and is unrelated.

The currency sub-claim is entirely uncovered (0.0). The skipped source 'Stablecoin Ledger — Why USDC settles instantly onchain' (price 0.003, within the 0.01 budget) is the most likely to address Arc's currency, since Arc is Circle's blockchain and USDC is Circle's stablecoin. Other skipped sources concern x402 timing, nanopayments, idempotency, or unrelated topics and are unlikely to fill the currency gap. The definition sub-claim is only partially covered (0.3), but no affordable skipped source clearly targets a general definition of Arc, so only the highest-priority currency source is recommended.

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

Paid $0.003 to Stablecoin Ledger — Why USDC settles instantly onchain (settled 525f0d47-d…) — S4

Final check — "What is the Arc blockchain?": 50% assessed by S1

Final check — "What currency does the Arc blockchain use?": 0% assessed

Final coverage assessment — S1 identifies Arc as Circle's institutional blockchain (an L2), giving a partial answer to what Arc is, but no source states what currency Arc uses. S2 describes Arc's consensus/settlement but not its currency. S3 and S4 discuss Stripe FX and USDC generally, not Arc's currency. Thus the first sub-claim is partially covered and the second is not covered. 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.

Below reward gate — S1 supports claim 1 at 10%: “Circle blockchain Arc's first day was dominated by memecoins, and the traders behind them had already moved on by Thursday morning.”

Verified — S2 supports claim 1 at 50%: “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…”

Below reward gate — S4 supports claim 2 at 10%: “USDC is a fully-reserved dollar stablecoin that settles peer-to-peer onchain in seconds.”

Below reward gate — S3 supports claim 2 at 0%: “We’re expanding multicurrency settlement to more markets and currencies, and we’re introducing the ability to convert currencies instantly—a…”

Rejected 0 invalid evidence span(s) and 3 unsupported citation marker(s); rejected markers cannot receive citation rewards.

Drafted answer citing 1 source(s)

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

Arc Settlement Benchmarks contributed 100% → reward $0.01

Settled $0.01 citation reward → Arc Settlement Benchmarks (b8d60ad3-3…)

Done. Spent $0.013 across 2 confirmed/simulated payment(s) to creators.