The Arbitrum x402 marketplace

Pay-per-call tools for AI agents - settled in USDC on Arbitrum in ~2 seconds, no signup, no API keys. The wallet is the account.

START HERE · BUYER PATH

auto-route a task →plan a multi-step job → try playground browse sellers

An open index of the whole Arbitrum x402 economy - this host plus every independent seller the crawl finds (CDP Bazaar included), each re-probed every 30 minutes. Not a walled market: other venues' listings appear here too.

Our latest own settlement (canary): $0.001 USDC · on-chain receipt · 2026-10-09T07:30:22.000Z

A paid canary buys tools over the Arbitrum rail daily (facilitator: Coinbase CDP first, PayAI as fallback) - uptime proven with real settlements, not pings.

·· RAIL MANIFEST ··ARBITRUM · MAINNET

networkeip155:42161

wiresx402

assetUSDC

settle latency~2 seconds

facilitatorCoinbase CDP (PayAI fallback)

buyer gasnone, the buyer only signs

explorerarbiscan.io →

daily canary✓ settled 10h ago

agents: GET /api/route?q=<task>&network=arbitrum

THIS SITE · HOST · NOT RANKED, NOT COUNTED

outside buyers on Arbitrum only

7 settlements, 30 days 4 distinct buyers, 30 days 7 settlements, since 2026-07-03 4 distinct buyers, since 2026-07-03

Agent402 runs this index and sells 500+ tools, metered models and reports on the same rails. Our own canary and volume runs are excluded from these figures; the ranked rows measure other sellers on chain and never include the host. Settlements are counted from the sales ledger, which starts 2026-07-03; earlier calls were served and settled but are not itemised in it, so these are not lifetime totals.

tools → why pay here → every settlement →

Chain

All Base Solana Polygon Arbitrum Monad Celo Avalanche Sei Optimism Stellar Algorand Robinhood Chain

Sort

healthy = the last crawl of the origin succeeded, nothing more. dispatch = this host's router will buy from this seller right now; a seller can be listed, healthy and still not dispatch-eligible (no known payment network, or no settlement history on Base yet). The reason is on each row and on /api/index as routerDispatchReason.

SELLERS LISTED

445

one per origin · host not counted · 445 origins indexed

TOOLS (THIS HOST)

609

OUR LATEST SETTLE

$0.001

our own canary or volume run

PRICE FLOOR

$0.001

# SELLER CALLS VOLUME BUYERS TOOLS Share of the busiest seller listed

ACTIVITYTHIS HOST · 30D

TRANSACTIONS-19.4%

VOLUME-19.4%

$0.0560

BUYERS+11.8%

all inbound USDC settlements to this host's Arbitrum wallet

RAILArbitrumASSETUSDCSELLERS445 + this hostSCOPETHIS HOSTSCAN COMPLETEWINDOW30D? keys

Activity

THIS HOST · PAST 30 DAYS

TRANSACTIONS

VOLUME

$0.06

BUYERS

all inbound USDC settlements to this host's Arbitrum wallet · includes 49 internal canary buys

Sellers accepting Arbitrum

pick a seller to scope the activity charts · THIS HOST = run by agent402 · every other seller is independent, found by the open crawl · per-seller settlement counts are measured on Base only, so this roster shows none for Arbitrum; pick a seller to scan its Arbitrum wallet

Buy tools with USDC on Arbitrum

608 of the 609 tools in the catalog take USDC on Arbitrum (1 tool is offered on Base only), from $0.001 to $3.30 a call, across crypto & onchain data, live public data, skill packs, web & documents, llm gateway, data conversion and more. The catalog page carries the category browser; this page is the chain's ledger.

agents: GET https://agent402.tools/api/route?q=<task>&network=arbitrum

Sell on Arbitrum

Accept the Arbitrum CAIP-2 network (eip155:42161) in your 402 challenge - the PayAI facilitator verifies and settles. Use @x402/evm for the server-side scheme, or agent402-tollbooth to paywall an existing site. Then serve /.well-known/x402 - list it on /sell (free) and the index crawler picks it up; ranking is health-based, listing is free. Want a guaranteed crawl? Open a seed request.

List your API

Your API's origin

Free, no account - we probe your origin's x402 surface and list you if it answers. Ranking is health-based.

402 challenge · accepts[]JSON

{
  "scheme": "exact",
  "network": "eip155:42161",
  "asset": "USDC",
  "payTo": "your-wallet"
}

machine-readable: /api/route?network=arbitrum · /.well-known/x402 · /openapi.json · /api/reliability