X402atlas

X402atlas is an x402-native service at https://chain-tools.use.x402atlas.com, 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. 7 endpoints listed.

Base

Offers

Offer	Endpoint	Price
Evm Abi Decode Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.	`/m/bz-chain-tools-use-x402atlas-com/evm/abi-decode`	0.005 USDC
Evm Abi Encode Solidity ABI calldata encoder — encode canonical typed values for an EVM smart-contract function call, with an optional selector and exact 256-bit integers.	`/m/bz-chain-tools-use-x402atlas-com/evm/abi-encode`	0.005 USDC
Evm Address Checksum EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.	`/m/bz-chain-tools-use-x402atlas-com/evm/address-checksum`	0.005 USDC
Evm Create2 CREATE2 deterministic contract address calculator — derive the EIP-1014 EVM deployment address, preimage, hashes, and EIP-55 checksum offline without RPC.	`/m/bz-chain-tools-use-x402atlas-com/evm/create2`	0.005 USDC
Merkle Build Keccak Merkle tree and proof builder — generate indexed sorted-pair inclusion proofs with domain separation and explicit odd-node promotion.	`/m/bz-chain-tools-use-x402atlas-com/merkle/build`	0.01 USDC
Merkle Verify Keccak Merkle proof verifier — validate inclusion plus exact leaf index and count proof shape for the Atlas sorted-pair tree profile.	`/m/bz-chain-tools-use-x402atlas-com/merkle/verify`	0.005 USDC
Solana Pda Solana Program Derived Address (PDA) calculator — derive the canonical off-curve address and bump from bounded public seeds offline, without RPC or key handling.	`/m/bz-chain-tools-use-x402atlas-com/solana/pda`	0.005 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-chain-tools-use-x402atlas-com/evm/abi-decode')
// 402 challenge signed and settled automatically; response includes Payment-Receipt

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/bz-chain-tools-use-x402atlas-com/evm/abi-decode
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …