Index onlineMerchant portal
Api Endpoint

Chain Heartbeat — Identity, Tip, Freshness, Gas, Fees & Finality

One call replaces the multi-request health sequence autonomous agents repeat before acting: EIP-155 chain ID, latest block height/header and age, gas price, EIP-1559 fee direction and recommended fee, safe/finalized tips when supported, utilization and a HEALTHY/CONGESTED/STALE verdict. Covers Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis and the newly live Robinhood Chain (chain ID 4663). Live public RPC, explicit capability gaps, no guessed values.

Open interactive test console

Offering

Provider
store.agentexchange.work
Method
GET
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://store.agentexchange.work/chain/heartbeat
MIME type
Not provided
First seen
2026-10-16T02:54:53.696Z
Last seen
Tags
Onchain, RPC, heartbeat, chain-health, chain-id, Block, Freshness, Gas, fee-history, finality, Multichain, robinhood-chain, data-feed

Website

Payment pricing

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

Payment option 1
0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.005 USDC
Atomic price: 5000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "payTo": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez"
  }
]

Observed health

Status
Healthy
Latest latency
1461 ms
Average latency
1489 ms
HTTP status
402
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": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "chain": {
          "type": "string",
          "description": "base|ethereum|optimism|arbitrum|polygon|gnosis|robinhood (default base)"
        }
      }
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "health": {
          "type": "string"
        },
        "chain_id": {
          "type": "number"
        },
        "latest": {
          "type": "object"
        },
        "gas": {
          "type": "object"
        },
        "fees": {
          "type": "object"
        },
        "finality": {
          "type": "object"
        }
      }
    }
  },
  "required": [
    "type"
  ]
}