Marketplace · API · x402

api.onesource.io/api/chain/chain-id

Ethereum chain ID (EIP-155) via eth_chainId - confirm which chain a network is on

Endpointhttps://api.onesource.io/api/chain/chain-id
Trust✓ Verified callable · 100% uptime over 1 checks · ~473 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea
methodGET
last updated2026-11-12T16:06:10.534Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.onesource.io/api/chain/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/x402-1ce5733d890eb797

Search the whole marketplace from your agent (MCP)

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

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