Breaking down: "I need to brief a teammate on per-request agent purchases without an account. What are the two or three facts I should lead with?"

Identified 3 research target(s) to investigate; these are not established facts

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

Discovered 21 verified creator source(s) and 4 free public reference(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 3/3 positive proposal(s): 3 cached + 0 fresh, predicting 3/3 claim(s) above the evidence floor with $0.000000/$0.015000 fetch USDC reserved.

Free-preview pre-check maps an actionable source to every sub-claim (3/3); paid reading may proceed within the budget.

Agent spend wallet ready: 0x29028Fe1122E17Fe7863A22701e863FE4DaE1aFB (balance sufficient)

Reused cached Agent Economy Weekly — x402 turns HTTP 402 into an agent payment rail (free) — S1

Reused cached Stablecoin Ledger — Stablecoins as the unit of account for agents (free) — S2

Reused cached Arc Settlement Benchmarks — Measuring x402 settlement latency on Arc (free) — S3

Sub-claim "What are the key facts about per-request agent purchases tha…": 80% covered by S1 — S1 directly states the key facts: x402 revives HTTP 402 as a payment rail, the server returns 402 with machine-readable payment requirements, the client signs a payment authorization and retries, and agents can pay per request with no accounts or API keys. This explicitly answers the no-account per-request purchase fact, though it is a short abstract and lacks operational detail.

Sub-claim "How does a per-request purchase without an account work for …": 70% covered by S1 — S1 gives the mechanism at a high level: server responds 402 with payment requirements, client signs a payment authorization and retries, enabling autonomous discovery and purchase at runtime without accounts or API keys. This is a direct answer to the flow, but the abstract omits concrete steps such as how the authorization is verified, settlement timing, or retry semantics.

Sub-claim "What are the main benefits or limitations of per-request age…": 40% covered by S1, S2, S3 — S1 provides the benefit of autonomous runtime purchasing without accounts or API keys. S2 gives a related precondition: stablecoins as a unit of account for rational budgeting. S3 gives settlement latency evidence for x402 batched payments. However, none of the supplied passages explicitly frames these as benefits or limitations of per-request no-account agent purchases, and limitations are largely absent.

Coverage is adequate for the first two facts, but the benefits/limitations claim is only partially covered and lacks explicit limitation evidence. The affordable skipped source 'Web Payments Review — How long do x402 payments take to finalize?' at $0.002 directly addresses end-to-end settlement timing for x402, which would strengthen the mechanism and limitation picture within the remaining $0.015 budget. Other skipped sources are either off-topic or less directly relevant to the requested no-account per-request purchase facts.

Filling gap — buying Web Payments Review — How long do x402 payments take to finalize? ($0.002)…

Paid $0.002 to Web Payments Review — How long do x402 payments take to finalize? (settled 7c54014f-9…) — S4

Final check — "What are the key facts about per-request agent purchases tha…": 100% assessed by S1

Final check — "How does a per-request purchase without an account work for …": 100% assessed by S1

Final check — "What are the main benefits or limitations of per-request age…": 70% assessed by S1, S2

Final coverage assessment — The supplied passages directly answer the core question: x402 enables per-request agent payments with no accounts or API keys, using HTTP 402 payment requirements and signed authorization retries. S1 explicitly states this mechanism and the no-account/no-API-key fact. S2 provides a supporting benefit/precondition: stablecoins like USDC let agents reason about budgets in stable terms. S3 and S4 conflict on settlement timing, but timing is not a requested fact for the lead briefing. The main gap is that the passages do not provide a full benefits/limitations analysis beyond autonomy and stable budgeting; however, the requested 'two or three facts' are covered by S1 and S2. 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 Settlement latency of x402 payments — S3 x402 batched settlements finalize in roughly 180 milliseconds on Arc testnet, with sub-second finality and no block-time binding. vs S4 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: S3 (S3 reports measured medians and p95 across thousands of submitBatch calls, while S4 is explicitly framed as a reading rather than a measurement, making S3 more specific and internally consistent.)

Verified — S1 supports claim 1 at 100%: “Agents can therefore pay per request with no accounts or API keys, discovering and purchasing data autonomously at runtime.”

Verified — S1 supports claim 2 at 80%: “A server responds 402 with machine-readable payment requirements; the client signs a payment authorization and retries.”

Verified — S2 supports claim 3 at 60%: “Dollar stablecoins like USDC let an agent price expected value against cost in stable terms, which is a precondition for rational spending d…”

Verified — S2 supports claim 3 at 60%: “A volatile token makes 'spend at most $0.05' meaningless minute to minute.”

Verified — S3 supports claim 3 at 70%: “Across thousands of submitBatch calls on Arc testnet, x402 batched settlements finalize in roughly 180 milliseconds (measured median 178ms, …”

Verified — S4 supports claim 3 at 70%: “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…”

Drafted answer citing 4 source(s)

Confidence: Low — the final assessment does not establish a complete supported answer for every requested part.

Agent Economy Weekly contributed 50% - reward $0.0075

Stablecoin Ledger contributed 30% - reward $0.0045

Arc Settlement Benchmarks contributed 15% - reward $0.00225

Web Payments Review contributed 5% - reward $0.00075

Settled $0.0075 citation reward → Agent Economy Weekly (1d6adb88-4…)

Settled $0.0045 citation reward → Stablecoin Ledger (4ef6eceb-b…)

Settled $0.00225 citation reward → Arc Settlement Benchmarks (2ce7e0a3-3…)

Settled $0.00075 citation reward → Web Payments Review (48b3e145-7…)

Done. Spent $0.017 across 5 confirmed/simulated payment(s) to creators.