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 21 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 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

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) — S3

Sub-claim "What is the Arc blockchain?": 40% covered by S3, S1 — S3 identifies Arc as Circle's blockchain (headline: 'Circle's institutional Arc blockchain'), and S1 adds that Arc uses BFT consensus with sub-second finality and is a testnet. This gives partial identification (issuer Circle, institutional positioning, consensus type), but no supplied passage explicitly defines what Arc is (e.g., an L2/settlement chain for stablecoin payments) or its architecture/purpose in a direct definitional statement.

Sub-claim "What currency does the Arc blockchain use?": 10% covered — No supplied passage states the currency or native token used by Arc. S1 mentions x402 batched settlements and Gateway-batched payments but never names a currency; S3 mentions memecoins on Arc but not the chain's currency. Topical context only, no answer.

Coverage for the currency sub-claim is below 0.5 and the 'Stablecoin Ledger — Why USDC settles instantly onchain' source ($0.003) is the only affordable skipped source plausibly addressing Arc's currency (USDC), fitting the $0.01 remaining budget. Other skipped sources concern x402 rails, nanopayments, idempotency, or unrelated topics and are unlikely to answer the currency question. The definitional gap for 'what is Arc' is partially filled by S3/S1; no affordable skipped source clearly provides a fuller definition.

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

Paid $0.003 to Stablecoin Ledger — Why USDC settles instantly onchain (settled 5d41ea10-7…) — S4

Final check — "What is the Arc blockchain?": 50% assessed by S3

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

Final coverage assessment — The supplied passages identify Arc as Circle's blockchain (S3) and describe settlement behavior on Arc testnet (S1), but none states what currency Arc uses. S4 discusses USDC generally, not as Arc's currency, and S2 discusses x402 timing without naming Arc's currency. Thus the definition sub-claim is partially covered, while the currency sub-claim has no direct answer. 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 — S3 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 — S1 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…”

Rejected 0 invalid evidence span(s) and 2 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 (1df59e67-c…)

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