x402.agentindex.world/base/chain-id

Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.

Endpoint	`https://x402.agentindex.world/base/chain-id`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~500 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	0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d
method	POST
last updated	2026-11-05T12:43:29.911Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402.agentindex.world/base/chain-id
# 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-e24b99a49a622551

Search the whole marketplace from your agent (MCP)

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