What is x402 in one sentence? — Keryx Dispatch

Archived dispatch

What is x402 in one sentence?

Lowconfidence— Contains synthetic demo material; its measurements cannot support factual conclusions.

7/13/2026, 3:09:21 PM · llm:deepseek:deepseek-chat

§ IIThe reading1 cited

Lowconfidence— Contains synthetic demo material; its measurements cannot support factual conclusions.deep research

Illustrative demo content: synthetic sources and measurements are not factual research evidence. Source provenance and payment status are separate; inspect the receipt for settled, pending or simulated payments. Settlement does not authenticate a source's claims.

x402 is a protocol that revives the HTTP 402 status code as a payment rail, enabling agents to pay per request without accounts or API keys .

Source inspection unavailable: this report has no stored excerpt ledger.

Research evidence matrix

Compare unverified research targets with cited sources and inspect recorded excerpts. An empty cell means no inspectable excerpt was recorded; it does not establish whether a claim is true, false, or disputed. Coverage and agent confidence do not prove entailment, measured accuracy or complete synthesis.

Research target by cited source evidence matrix
Research target (unverified)	Inspection status	[S3] Agent Economy WeeklyPublication: Agent Economy WeeklyPublished: Not recorded
x402 is a proposed standard for decentralized identity and access management.	Evidence ledger unavailable	No excerpt recorded

Reference export

0 article references. Recorded titles, links and dates; observed scholarly records also include supplied authors, DOI and journal metadata with read limits. Review metadata before using in a paper. Import RIS into Zotero with File → Import.

1 citations omitted because an article title or usable article link is unavailable.

Cited sources and references

3Agent Economy WeeklySynthetic demo content ? illustrative only100%$0.006 planned

Recorded spend$0.012

Recorded creator share100%

Decisions0 bought · 7 cached · 13 skipped

llm:deepseek:deepseek-chatArc Testnet · historical

Decision log · 45 steps

§ IThe decision$0.006 settled / $0.012

50%$0.006 under cap

Decompose

Breaking down: "What is x402 in one sentence?"

Decompose

Identified 1 sub-claim(s) to support

Discover

Discovered 20 verified source(s)

Discover

Loaded query memory: 20 known sources from past runs.

Discover

ERC-8004 reputation loaded — composite scores from past queries.

DecideCACHE

Web Payments Review$0.002 · EV 50%

Moderate reputation (7/100) and hit rate (62%). Cached, free. Preview directly asks 'How long do x402 payments take to finalize?' Highly relevant.

DecideCACHE

Arc Settlement Benchmarks$0.003 · EV 60%

High reputation (14/100) and hit rate (76%). Cached, free. Preview directly mentions x402 settlement latency. Highly relevant.

DecideCACHE

Agent Economy Weekly$0.004 · EV 70%

High reputation (16/100) and hit rate (80%). Cached, free. Preview directly defines x402 as 'HTTP 402 into an agent payment rail'. Highly relevant to the question.

DecideCACHE

Stripe Blog$0.002 · EV 30%

Low reputation (not in top 8) and hit rate (24%). Cached, free. Preview mentions agent integrations but not x402 directly. Some relevance.

DecideCACHE

Stablecoin Ledger$0.003 · EV 40%

High reputation (16/100) and hit rate (82%). Cached, free. Stablecoins are relevant to x402 as a payment rail, but the preview focuses on USDC settlement, not directly on x402 definition.

DecideCACHE

Onchain Micropayments Digest$0.005 · EV 50%

Highest reputation (22/100) and hit rate (86%). Cached, free. Relevant to micropayments which are core to x402, but preview does not explicitly define x402.

DecideCACHE

Latent.Space$0.004 · EV 30%

Not in historical top 8, but tags include AI agents. Cached, free. Preview does not mention x402, but could have relevant context. Moderate value.

DecideSKIP

Ethereum Foundation Blog$0.002 · EV 10%

Low reputation (4/100) and hit rate (32%). Preview about transaction approvals, not x402. Tangential at best.

DecideSKIP

Vitalik Buterin's website$0.004 · EV 20%

Not in historical top 8. Preview topics (formal verification, LLM setup) not directly about x402. Could be tangentially relevant but not worth budget.

DecideSKIP

The Coinbase Blog - Medium$0.003 · EV 15%

Not in historical top 8. Preview about regulatory news, not x402. Low relevance.

DecideSKIP

Decrypt$0.002 · EV 10%

Not in historical top 8. Preview about AI and crypto news, no x402. Low relevance.

DecideSKIP

CoinDesk: Bitcoin, Ethereum, Crypto News and Price Data$0.002 · EV 10%

Low reputation (not in top 8) and hit rate (20%). Preview about bitcoin miners, not x402. Low relevance.

DecideSKIP

Distributed Systems Notes$0.003 · EV 10%

Low reputation (4/100) and hit rate (40%). Preview on idempotency is tangentially relevant but not directly about x402. Not worth budget.

DecideSKIP

Simon Willison's Weblog$0.003 · EV 10%

Not in historical top 8. Preview shows unrelated quotes and tool updates. Low relevance to x402.

DecideSKIP

Hugging Face - Blog$0.003 · EV 10%

Low reputation (3/100) and hit rate (14%). Preview about ML evaluation, not x402. Low relevance.

DecideSKIP

Cointelegraph.com News$0.002 · EV 5%

Low reputation (not in top 8) and hit rate (20%). Preview is general crypto news, no x402 mention. Not worth budget.

DecideSKIP

Garden & Soil Monthly$0.002 · EV 0%

Completely off-topic (gardening). No relevance to x402.

DecideSKIP

Retro Game Hardware$0.002 · EV 0%

Off-topic (retro gaming hardware). No relevance to x402.

DecideSKIP

Inner Axiom — The Codex$0.002 · EV 0%

Off-topic (esoteric/mystic). No relevance to x402.

DecideSKIP

Conzit Labs$0.002 · EV 0%

Off-topic (tech reviews, lifestyle). No relevance to x402.

Fetch

Agent spend wallet ready: 0x29028Fe1122E17Fe7863A22701e863FE4DaE1aFB (balance sufficient)

Fetch

Reused cached Web Payments Review (free) — S1

Fetch

Reused cached Arc Settlement Benchmarks (free) — S2

Fetch

Reused cached Agent Economy Weekly (free) — S3

Fetch

Reused cached Stripe Blog (free) — S4

Fetch

Reused cached Stablecoin Ledger (free) — S5

Fetch

Reused cached Onchain Micropayments Digest (free) — S6

Fetch

Reused cached Latent.Space (free) — S7

Re-evaluate

Sub-claim "x402 is a proposed standard for decentralized identity and a…": 20% covered by S3 — S3 describes x402 as a payment rail using HTTP 402, but does not mention decentralized identity or access management. Other sources discuss payments, settlement, and agents, but none support the claim that x402 is a standard for decentralized identity and access management.

Re-evaluate

Coverage for the claim is very low (0.2). The claim is about decentralized identity and access management, but gathered sources focus on payments. Skipped sources like Ethereum Foundation Blog, Vitalik Buterin's website, and Coinbase Blog may discuss decentralized identity standards. Their total price (0.002+0.004+0.003=0.009) exceeds remaining budget (0.006), so only the first two (0.002+0.004=0.006) fit. Recommend buying Ethereum Foundation Blog and Vitalik Buterin's website.

Re-evaluate

Filling gap — buying Ethereum Foundation Blog ($0.002)…

Re-evaluate

Paid $0.002 to Ethereum Foundation Blog (settled 765972f6-9…) — S8

Re-evaluate

Filling gap — buying Vitalik Buterin's website ($0.004)…

Re-evaluate

Paid $0.004 to Vitalik Buterin's website (settled 2a829dad-d…) — S9

Synthesize

Synthesizing a grounded answer from 9 source(s)…

Synthesize

Drafted answer citing 1 source(s)

Verdict

Confidence: Moderate — 1 source cited.

Attribute

Agent Economy Weekly contributed 100% → reward $0.006

Settle

Settled $0.006 citation reward → Agent Economy Weekly (a730ca04-f…)

Done

Done. Spent $0.012 across 3 payment(s) to creators.

Read checkpoints

Read checkpoint evidence is unavailable for this report. Historical, private and unsupported native runs are not reconstructed.

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.

View JSON ↗Download

Recorded purchase outcomes

Did the exact article versions bought for this answer appear in its citations? This view scores retained BUY decisions against payment observations recorded in the same dispatch trace.

Recorded settlement bookkeeping only; Circle and chain settlement have not been independently rechecked here.

This is a partial retained trace sample, not a full payment ledger. An absent matching payment does not prove that no payment occurred; excluded and unconfirmed costs remain unknown.

Recorded network: eip155:5042002
Dispatch recorded at: 2026-07-13T08:09:21.851Z

Frozen testnet archive, captured 2026-10-03T00:26:18.665Z. This is historical testnet evidence, separate from current mainnet activity.

Archive source commit: f9dca8d04f4657abbf0153175feec65728ba6a99
Archive database SHA-256: c5d9c0d2bf01099de526d7510321eabd1b0e3519f2792d40b61e49062d766272

Participant cohort: unknown. No outside-customer usage is inferred.

0 scored exact-version purchases from 0 recorded BUY decisions; 0 BUY decisions unscored. 3 of 3 trace payment observations excluded.

Each unique source + item + content version with positive matching recorded settled access counts once. Duplicate BUYs, missing identities, zero/unconfirmed access and incompatible payment observations cannot create a scored purchase. CACHE and SKIP decisions are outside this sample.

Exact-version citation hit rate: Unmeasured
Recorded access cost of uncited purchases: Unmeasured

Predicted value and observed citations

Bins compare the recorded predicted value with citation occurrence in this one dispatch. Small samples do not validate a probability model.

Value band	Predicted mean (0–1)	Citation rate
0–0.2	Unmeasured	Unmeasured
0.2–0.4	Unmeasured	Unmeasured
0.4–0.6	Unmeasured	Unmeasured
0.6–0.8	Unmeasured	Unmeasured
0.8–1	Unmeasured	Unmeasured

Missed value, cost per supported claim, budget alternatives and counterfactual outcomes are unmeasured. No extra reading or learning was performed.

View outcome JSON Download outcomes

A new follow-up runs on Arc mainnet with today’s sources and budget. Only the historical question supplies context.

Ask a follow-upNew dispatch · creators paid again

Carries this dispatch’s question as context — never its answer. The next dispatch is read from sources bought for it.

From the archive

Related dispatches

Dispatch · Arc testnet historyOct 2, 2026

Which specific claim does Agent Economy Weekly make about signed x402 payment authorization, and what supports that claim?

1 source cited0.0210 test USDC recorded creator rewards

Dispatch · Arc testnet historySep 30, 2026

I am reading about signed x402 payment authorization. What is the main point, and what does Agent Economy Weekly say about it?

1 source cited0.0150 test USDC recorded creator rewards

Dispatch · Arc testnet historySep 30, 2026

What is easy to misunderstand about signed x402 payment authorization, and what does the evidence actually show?

2 sources cited0.0150 test USDC recorded creator rewards

Dispatch · Arc testnet historySep 30, 2026

What problem led to the x402 HTTP payment flow, and what changed from earlier approaches?

3 sources cited0.0170 test USDC recorded creator rewards

Browse the full archive ▸