api.onesource.io/api/chain/nonce/:address

Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent

Endpoint	`https://api.onesource.io/api/chain/nonce/:address`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~400 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	0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea
method	GET
last updated	2026-11-12T21:41:53.53Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.onesource.io/api/chain/nonce/:address
# 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/x402-2f828f66024b12b4

Search the whole marketplace from your agent (MCP)

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