Roundhouse AI

Onchain Query API

Latest block on any major EVM chain: block number, timestamp, age in seconds, base fee and gas used/limit. The cheapest possible liveness and chain-tip check for an agent: confirm a chain is progressing, timestamp an observation, or pick a block for a query.

DataLiveeip155:8453Exactvia cdp
https://chain.cyberwarex.com/block
BlockBlockchainEvmChain-tipOnchain-data
Calls · 30d
17
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 snapshots so far.
$10.61
Verified settled volume
1,431 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
18
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-09-24 07:35Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

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.

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "catalog": {
    "docs": "https://cyberwarex.com/llms.txt",
    "services": "https://cyberwarex.com/.well-known/x402"
  },
  "resource": {
    "url": "https://chain.cyberwarex.com/block",
    "tags": [
      "block",
      "blockchain",
      "evm",
      "chain-tip",
      "onchain-data"
    ],
    "iconUrl": "https://cyberwarex.com/assets/icon.png",
    "mimeType": "application/json",
    "description": "Latest block on any major EVM chain: block number, timestamp, age in seconds, base fee and gas used/limit. The cheapest possible liveness and chain-tip check for an agent: confirm a chain is progressing, timestamp an observation, or pick a block for a query.",
    "serviceName": "Onchain Query API"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "hash": "0x9a1c…",
            "chain": "base",
            "number": 51142663,
            "chain_id": 8453,
            "gas_used": 18234012,
            "tx_count": 212,
            "gas_limit": 150000000,
            "timestamp": 1789081234,
            "age_seconds": 3,
            "base_fee_gwei": 0.0061
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "chain": {
                    "enum": [
                      "base",
                      "ethereum",
                      "arbitrum",
                      "optimism",
                      "polygon"
                    ],
                    "type": "string",
                    "default": "base",
                    "description": "EVM chain to query."
                  }
                },
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "properties": {
                  "hash": {
                    "type": "string"
                  },
                  "chain": {
                    "type": "string"
                  },
                  "number": {
                    "type": "integer"
                  },
                  "chain_id": {
                    "type": "integer"
                  },
                  "gas_used": {
                    "type": "integer"
                  },
                  "tx_count": {
                    "type": "integer"
                  },
                  "gas_limit": {
                    "type": "integer"
                  },
                  "timestamp": {
                    "type": "integer"
                  },
                  "age_seconds": {
                    "type": "integer"
                  },
                  "base_fee_gwei": {
                    "type": "number"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0x058D…921B2. The signed payment is good for 5 minutes.

Paid to
0x058D…921B2
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": "0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": "base"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "hash": "0x9a1c…",
          "chain": "base",
          "number": 51142663,
          "chain_id": 8453,
          "gas_used": 18234012,
          "tx_count": 212,
          "gas_limit": 150000000,
          "timestamp": 1789081234,
          "age_seconds": 3,
          "base_fee_gwei": 0.0061
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "chain": {
                  "enum": [
                    "base",
                    "ethereum",
                    "arbitrum",
                    "optimism",
                    "polygon"
                  ],
                  "type": "string",
                  "default": "base",
                  "description": "EVM chain to query."
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "hash": {
                  "type": "string"
                },
                "chain": {
                  "type": "string"
                },
                "number": {
                  "type": "integer"
                },
                "chain_id": {
                  "type": "integer"
                },
                "gas_used": {
                  "type": "integer"
                },
                "tx_count": {
                  "type": "integer"
                },
                "gas_limit": {
                  "type": "integer"
                },
                "timestamp": {
                  "type": "integer"
                },
                "age_seconds": {
                  "type": "integer"
                },
                "base_fee_gwei": {
                  "type": "number"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-24 07:35Z
Last indexed by Roundhouse
2026-09-24 21:30Z
Last enriched (probe, favicon, geo)
2026-09-11 12:46Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 402
Report

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. 13 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service Onchain Query API 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=Onchain%20Query%20API'
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://chain.cyberwarex.com/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.