Marketplace · API · x402

x402.freeq.one/tools/wallet_checksum

Ethereum Address Checksum: Convert an Ethereum address to its EIP-55 checksummed form. SIWE messages require the checksummed address on line 2 before signing. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_checksum.

Endpoint	`https://x402.freeq.one/tools/wallet_checksum`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~282 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0x90b0dC893406d6eA63bb077ED59F5e8340f98d84
method	POST
last updated	2026-11-13T05:38:27.449Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402.freeq.one/tools/wallet_checksum
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-0faf8d3a809c5cb5

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}