Duckdns

Duckdns is an x402-native service at https://chainsscope.duckdns.org, indexed from the x402 Bazaar (Coinbase's public discovery directory). It charges callers itself in USDC on Base and is paid directly at its own wallet; Monex Protocol passes your request and payment headers through untouched. 3 endpoints listed.

Base

Offers

Offer	Endpoint	Price
Tools Ens Resolve Turn a .eth name into an address, or an address into its primary .eth name -- one endpoint, auto-detects which direction based on the input. Ethereum mainnet only (ENS has no separate Base deployment).	`/m/bz-chainsscope-duckdns-org/tools/ens-resolve`	0.01 USDC
Tools Fee Estimate Current network fee conditions -- gas price (ETH/Base/Arbitrum/Optimism/Polygon), sat/vB fee tiers (Bitcoin), or recent prioritization fees (Solana) -- useful for an agent about to construct a transaction itself.	`/m/bz-chainsscope-duckdns-org/tools/fee-estimate`	0.01 USDC
Tools Wallet Scan The flagship: balance, token holdings, recent activity, USD portfolio value, and an OFAC sanctions-list check for a wallet, in one call -- across Ethereum, Base, Arbitrum, Optimism, Polygon, Bitcoin, and Solana. Cheaper and simpler than calling wallet-balance + token-holdings + address-activity separately. Sanctions screening only (not a general scam detector) -- an honest, narrower claim, not a v	`/m/bz-chainsscope-duckdns-org/tools/wallet-scan`	0.04 USDC

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

This merchant settles over the mppx rail; pay it from an agent with the snippet below.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

import { Mppx, evm } from 'mppx/client'
import { privateKeyToAccount } from 'viem/accounts'

const mppx = Mppx.create({
  methods: [evm({
    account: privateKeyToAccount(process.env.KEY),
    currencies: [evm.assets.base.USDC],
  })],
})

const res = await mppx.fetch('https://api.meshgateway.co/m/bz-chainsscope-duckdns-org/tools/ens-resolve')
// 402 challenge signed and settled automatically; response includes Payment-Receipt

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/bz-chainsscope-duckdns-org/tools/ens-resolve
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …