On-chain Block / Height
Fetch an EVM block (latest or by number). Given a chain and an optional block number returns block number, hash, parent hash, timestamp, transaction count, gas used/limit, base fee and miner. Omit the number for the current block height. For indexers, chain-tip monitoring, finality-tracking and block-explorer agents.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"hint": "Use a supported wallet to pay for this resource using one of the supported payment methods returned in the WWW-Authenticate header. See https://mpp.dev/tools/wallet.md",
"type": "https://paymentauth.org/problems/payment-required",
"title": "Payment Required",
"detail": "Payment is required (Fetch an EVM block (latest or by number). Given a chain and an optional block number returns block number, hash, parent hash, timestamp, transaction count, gas used/limit, base fee and miner. Omit the number for the current block height. For indexers, chain-tip monitoring, finality-tracking and block-explorer agents.).",
"status": 402,
"challengeId": "BWxUmVyZ89Yr3jUIzLxGgYWa9HqXTXiOhX6cf88Vpbg"
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.001 USDC on Base to 0xCe33…a989E. The signed payment is good for 5 minutes.
- Paid to
- 0xCe33…a989E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xCe339395d7f2ea5a5009022EF1C392Fb208a989E",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"chain": "ethereum"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"block": {
"hash": "0xabc...",
"chain": "ethereum",
"miner": "0x1111111111111111111111111111111111111111",
"number": 21000000,
"gasUsed": "12000000",
"txCount": 120,
"gasLimit": "30000000",
"timestamp": "2026-08-25T12:00:00.000Z",
"parentHash": "0xdef...",
"timestampUnix": 1787083200,
"baseFeePerGasWei": "8000000000"
},
"chain": "ethereum",
"route": "onchain.block",
"machine": "portfolio"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [],
"properties": {
"block": {
"type": "integer",
"minimum": 0,
"description": "Block number; omit for the latest block."
},
"chain": {
"type": "string",
"default": "ethereum",
"description": "EVM chain (ethereum, base, arbitrum, optimism, polygon, bsc)."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"machine",
"route",
"block"
],
"properties": {
"block": {
"type": "object",
"properties": {
"hash": {
"type": [
"string",
"null"
]
},
"chain": {
"type": [
"string",
"null"
]
},
"miner": {
"type": [
"string",
"null"
]
},
"number": {
"type": [
"integer",
"null"
]
},
"gasUsed": {
"type": [
"string",
"null"
]
},
"txCount": {
"type": [
"integer",
"null"
]
},
"gasLimit": {
"type": [
"string",
"null"
]
},
"timestamp": {
"type": [
"string",
"null"
]
},
"parentHash": {
"type": [
"string",
"null"
]
},
"timestampUnix": {
"type": [
"integer",
"null"
]
},
"baseFeePerGasWei": {
"type": [
"string",
"null"
]
}
}
},
"chain": {
"type": "string"
},
"route": {
"type": "string"
},
"machine": {
"type": "string"
},
"economics": {
"type": "object",
"properties": {
"sellPriceUsd": {
"type": "number"
},
"upstreamCostUsdActual": {
"type": [
"number",
"null"
]
}
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-17 04:04Z
- Last indexed by Roundhouse
- 2026-09-24 10:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 20:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service On-chain Block / Height and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=On-chain%20Block%20%2F%20Height' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://agent-commerce-factory-jm.austriaeast.cloudapp.azure.com/v1/onchain/block, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.