Index onlineMerchant portal
Api Endpoint

base-chain-id

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

Open interactive test console

Offering

Provider
x402.agentindex.world
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://x402.agentindex.world/base/chain-id
MIME type
application/json
First seen
2026-10-16T01:50:38.788Z
Last seen
Tags
base rpc, chain id, eip155, Base mainnet, network identification

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
  }
]

Observed health

Status
Reachable
Latest latency
1238 ms
Average latency
914 ms
HTTP status
405
Last checked
Reachability
100% over 12 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {},
      "title": "ChainIdInput",
      "type": "object"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "chain_id": {
          "title": "Chain Id",
          "type": "integer"
        },
        "chain_id_hex": {
          "title": "Chain Id Hex",
          "type": "string"
        },
        "caip2": {
          "title": "Caip2",
          "type": "string"
        }
      },
      "required": [
        "chain_id",
        "chain_id_hex",
        "caip2"
      ],
      "title": "ChainIdOutput"
    }
  },
  "required": [
    "type"
  ]
}