Memory compare-and-set

agent402.tools · x402

Atomically write (or release) a key only if its current value equals `expected` - the coordination primitive for distributed locks and optimistic concurrency across agents. Acquire a lock: expected=null + a value + ttlSeconds. Release it: expected=<your token> with no value (deletes on match). Update safely: expected=<old>, value=<new>. Returns whether it swapped and the current value.

Name and description as published by x402 Bazaar

Filed under Agent memory & workflows by addrbook, from the words in its listing

Live

Last successful check: 9 Nov 2026, 14:33 UTC.

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

1 wallet paid it in the last 30 days, as the x402 Bazaar reports. Payments

How addrbook checks →

Evidence

2 of 4 shown

Answers when askedShown
Answered a check 9 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 walletsShown
102 independent wallets paid it in 30 days, counted on-chain by addrbook.
Tool scanDoes not apply
Not an MCP server.

Decided 10 Nov 2026, 00:21 UTC by method 2026.10.2, from its recorded evidence. A check that does not apply is left out of the count.

Connect

https://agent402.tools/api/memory/cas

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, 05:51 UTC
Wallets named: 0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0named by x402 Bazaar
Proven to belong to it: Nothing yet. Is it yours?
Listed since: 25 Oct 2026, 17:51 UTC

Payments

wallets paid it, last 30 days: 102
independent of the seller: 102
paid in two or more weeks: 2
USDC payments: 235

Counted by addrbook from USDC transfers to the wallets it asks to be paid at, on Arc. A payer is independent when it is not one of the seller's own wallets and the seller did not fund it; the largest payer made 38.7% of the payments. Naming a wallet does not prove it is this seller's, unless a signature shows that above. Counted 10 Nov 2026, 06:29 UTC. How payers are counted

different wallets paid it, last 30 days: 1
paid calls, last 30 days: 9
last paid call (UTC): 4 Nov, 13:17

As the x402 Bazaar reports, from payments Coinbase's facilitator settled. Read 10 Nov 2026, 05:51 UTC. addrbook has not counted these payments itself.

How it asks to be paid

Network	Price	Paid in	Settled by	Pays to
Base	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Polygon	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Arbitrum	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Monad	1000smallest units	“USDC”not a Circle contract	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Avalanche	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Sei	1000smallest units	“USDC”not a Circle contract	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Optimism	$0.002	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
eip155:4663	10000smallest units	“Global Dollar”not a Circle contract	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Celo	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
eip155:57073	1000smallest units	“USDC”not a Circle contract	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
Arc	$0.001	USDC	Per request	0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0

From its own 402 answer at 9 Nov, 14:33 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
agent402.tools	x402	Live	9 Nov, 14:33	9 Nov, 14:33	100%	100%	—

History

9 Nov 2026, 09:18 UTCWeek of 2026-11-02: 24 paying wallets, 24 of them independent, counted on-chain.#4367893
9 Nov 2026, 08:18 UTCWeek of 2026-11-02: 24 paying wallets, 24 of them independent, counted on-chain.#4364786
9 Nov 2026, 07:17 UTCWeek of 2026-11-02: 24 paying wallets, 24 of them independent, counted on-chain.#4361431
9 Nov 2026, 00:14 UTCWeek of 2026-11-02: 24 paying wallets, 24 of them independent, counted on-chain.#4336377
7 Nov 2026, 20:32 UTCThe x402 Bazaar now reports 1 paying wallets over 30 days.the x402 Bazaar#3969273
7 Nov 2026, 04:24 UTCPayment options changed: 11 now, 10 before.https://agent402.tools/api/memory/cas#3938749
5 Nov 2026, 19:08 UTCPrice on eip155:4663 changed from 5000 units to 10000 units.https://agent402.tools/api/memory/cas#3443834
4 Nov 2026, 19:58 UTCThe x402 Bazaar now reports 2 paying wallets over 30 days.the x402 Bazaar#3066002

Its whole history →

Also listed as

Other entries that share an endpoint with this one.

agent402.tools

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/memory-compare-and-set-e1f07518/badge.svg)](https://addrbook.com/agents/memory-compare-and-set-e1f07518)