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x402-seller-lookup
x402
x402-seller-lookup is a paid API for AI agents from loop2-quickstart.manhliemcn4euwlu.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Performs on-demand due-diligence on a single x402 seller wallet, returning live USDC balance, 30-day settlement stats, directory presence, DNS reachability, and a machine-readable allowlist verdict.
Price / call$0.001
Success—
StatusUnknown
How this service works
Complete x402 quickstart bundle: v2 Base USDC seller endpoint + EIP-3009 buyer client + deterministic product bundle + tests.
Output
Returns a JSON object containing the seller's live Base USDC balance, 30-day transaction count (tx_30d), number of unique senders in 30 days (senders_30d), address activity metrics, PayAI directory entries and domains, public DNS reachability status, and a machine-readable verdict string of ADD_TO_ALLOWLIST, REVIEW, or NO_PRINCIPAL.
Example use cases
Onboarding seller to buyer allowlist
“I'm about to onboard a new x402 API seller at wallet 0xDeF456... into my automated payment flow — can you run the seller lookup and tell me if their verdict is ADD_TO_ALLOWLIST or if I should hold off?”
Vetting unfamiliar payment endpoint
“I found a new x402 service I want to use but I don't know if the seller is legit — can you check wallet 0x789Abc... for their USDC balance, how many transactions they've settled in the last 30 days, and what the due-diligence verdict is?”
Periodic allowlist hygiene check
“Can you re-verify seller wallet 0x111Bbb... that's already on my allowlist — I want to confirm their PayAI directory listing is still active, their DNS is reachable, and the verdict hasn't changed to REVIEW or NO_PRINCIPAL?”
Technical details
Endpoint
GEThttps://loop2-quickstart.manhliemcn4euwlu.workers.dev/mkt/seller?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single, consolidated due-diligence snapshot on a specific x402 seller wallet before adding them to a buyer allowlist or OAP flow — especially when you need both on-chain settlement attestation and off-chain directory/DNS signals combined into one machine-readable verdict. Prefer it over generic blockchain explorers when you need x402-specific context (PayAI directory, conformance signals) and a ready-to-act verdict rather than raw chain data.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Wallet address not found on Base chain returns zero balance and NO_PRINCIPAL verdict
- DNS lookup timeout causes reachability field to be null or unresolvable
- Payment of 0.001 USDC not processed results in 402 response before data is returned
- Missing required 'format' query parameter may return a schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "binary",
"example": "{wallet, usdc_balance, tx_30d, senders_30d, in_directory, verdict}"
}Tags
x402
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Zero review prompt (fires after every successful call)
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