DOI metadata and citation

api.vextorium.com · x402

Metadata of a publication by DOI (Crossref): title, authors, journal or publisher, year, type, citation count, references, license, link and an APA-formatted citation.

Name and description as published by x402 Bazaar

Filed under Science & research by addrbook, from the words in its listing

Live

Last successful check: 9 Nov 2026, 20:40 UTC.

answered, last 24 hours: 100%
answered, last 30 days: 100%

2 different wallets paid it in the last 30 days, as the x402 Bazaar reports. Payments

How addrbook checks →

Evidence

1 of 4 shown

Answers when askedShown
Answered a check 18 hours ago.
Owner provenNot shown
No one has proven control of its domain or of the wallet it is paid at.
Track recordNot shown
Listed for 15 days; 30 are needed.
Independent paying walletsNot shown
2 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook); 10 are needed.
Tool scanDoes not apply
Not an MCP server.

Decided 10 Nov 2026, 15:36 UTC by method 2026.11.3, from its recorded evidence. A check that does not apply is left out of the count.

Connect

https://api.vextorium.com/v1/doi-info

x402: an unpaid request gets a 402 with the price and pay-to wallet. The check never pays.

Who's behind it

Listed by: x402 Bazaarlast seen 10 Nov, 10:14 UTC
Wallets named: 0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acfnamed by x402 Bazaar
Proven to belong to it: Nothing yet. Is it yours?
Same name: 1 other agent uses this name.
doi-metadata-and-citation-d53bb113
Listed since: 25 Oct 2026, 17:51 UTC

Payments

different wallets paid it, last 30 days: 2
paid calls, last 30 days: 3
last paid call (UTC): 6 Nov, 21:31

As the x402 Bazaar reports, from payments Coinbase's facilitator settled. Read 10 Nov 2026, 10:14 UTC. addrbook has not counted these payments itself.

How it asks to be paid

Network	Price	Paid in	Settled by	Pays to
Base	$0.002	USDC	Per request	0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acf
Solana	$0.002	USDC	Per request	HcjfmZLgWRZzwj4deEiS7pewc4KBYSw39mW5nTyt3pz2
XRP Ledger	—	A tokennot a Circle contract	Per request	rEac5rTEr7y81iEyrMTrHCRbnktSE2pNCp
XRP Ledger	1540smallest units	A tokennot a Circle contract	Per request	rEac5rTEr7y81iEyrMTrHCRbnktSE2pNCp
Polygon	$0.002	USDC	Per request	0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acf
Optimism	$0.002	USDC	Circle Gateway	0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acf
Arc	$0.002	USDC	Circle Gateway	0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acf
Stellar	20000smallest units	A tokennot a Circle contract	Per request	GD6AWK4HTMG3FHNTXRFI2GZC2AQQCNQRFBMS5RXWYIJTEX2RR7GOYSAH

From its own 402 answer at 9 Nov, 20:40 UTC. USDC and Circle Gateway are recognised by their contract addresses, not by the names a seller gives them. How payments are read

Checks by endpoint

Host	Protocol	State	Last checked (UTC)	Last answered (UTC)	24 hours	30 days	Tools
api.vextorium.com	x402	Live	9 Nov, 20:40	9 Nov, 20:40	100%	100%	—

History

9 Nov 2026, 20:40 UTCNow asks to be paid at GD6AWK4HTMG3FHNTXRFI2GZC2AQQCNQRFBMS5RXWYIJTEX2RR7GOYSAH.https://api.vextorium.com/v1/doi-info#4385510
7 Nov 2026, 20:31 UTCThe x402 Bazaar now reports 2 paying wallets over 30 days.the x402 Bazaar#3968040
7 Nov 2026, 11:04 UTCPayment options changed: 7 now, 7 before.https://api.vextorium.com/v1/doi-info#3948513
6 Nov 2026, 20:22 UTCThe x402 Bazaar updated its listing.the x402 Bazaar#3763130
3 Nov 2026, 19:33 UTCThe x402 Bazaar now reports 3 paying wallets over 30 days.the x402 Bazaar#2632637
26 Oct 2026, 14:43 UTCFirst recorded as answering. (already true when recording began)https://api.vextorium.com/v1/doi-info#178262
26 Oct 2026, 14:40 UTCPayment terms first read: 7 options, from $0.002 on Base. (already true when recording began)https://api.vextorium.com/v1/doi-info#132612
26 Oct 2026, 14:37 UTCListed by the x402 Bazaar. The listing names wallet 0xb9f06d2734b7e9d7b21b64c4d8b95bd774b71acf. (already true when recording began)the x402 Bazaar#69803

Its whole history →

Also listed as

Other entries that share an endpoint with this one.

api.vextorium.com

Is it yours?

Prove you control one of its domains or wallets and it passes the owner check. You can then reply beside the evidence and get alerts when it changes. Claim this agent

Its evidence badge, for a README or a site. It shows the same count as this page, never a verdict.

[![addrbook evidence](https://api.addrbook.com/v1/agents/doi-metadata-and-citation-19845e3e/badge.svg)](https://addrbook.com/agents/doi-metadata-and-citation-19845e3e)