Roundhouse

Onchain Query API

Eight live x402 APIs for AI agents: web access, token safety, speech-to-text, chain data, SEO, search, email, video. Pay per call in USDC on Base, no API key.

TradingLiveeip155:8453Exactvia cdp
https://chain.cyberwarex.com/gas
GasGas-feesEvmBlockchainTransaction-cost
Calls · 30d
3↑ 14%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 29 snapshots so far.
$10.58
Verified settled volume
1,425 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-09-17 06:19Z
—
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": "2000",
      "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/gas",
    "tags": [
      "gas",
      "gas-fees",
      "evm",
      "blockchain",
      "transaction-cost"
    ],
    "iconUrl": "https://cyberwarex.com/assets/icon.png",
    "mimeType": "application/json",
    "description": "Live gas market on any major EVM chain: current gas price, base fee and priority-fee percentiles (p25/p50/p75) in gwei, plus the estimated cost in native token and USD for a plain transfer (21k gas) and a typical DEX swap (200k gas). Lets an agent decide whether a transaction is worth sending right now or should wait for cheaper gas, and budget the fee before signing.",
    "serviceName": "Onchain Query API"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "chain": "base",
            "native": "ETH",
            "est_cost": {
              "swap_200k": {
                "usd": 0.003599,
                "native": 0.000001127
              },
              "transfer_21k": {
                "usd": 0.000377,
                "native": 1.18e-7
              }
            },
            "native_usd": 3194.51,
            "base_fee_gwei": 0.004119,
            "gas_price_gwei": 0.008312,
            "priority_fee_gwei": {
              "p25": 0.001,
              "p50": 0.0015,
              "p75": 0.0031
            }
          }
        }
      },
      "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",
                "required": [],
                "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": {
                  "chain": {
                    "type": "string"
                  },
                  "native": {
                    "type": "string"
                  },
                  "est_cost": {
                    "type": "object",
                    "description": "Estimated native + USD cost for transfer_21k and swap_200k."
                  },
                  "native_usd": {
                    "type": [
                      "number",
                      "null"
                    ]
                  },
                  "base_fee_gwei": {
                    "type": [
                      "number",
                      "null"
                    ]
                  },
                  "gas_price_gwei": {
                    "type": "number"
                  },
                  "priority_fee_gwei": {
                    "type": [
                      "object",
                      "null"
                    ],
                    "description": "Priority fee percentiles p25/p50/p75 in gwei."
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "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.

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 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
2000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": "base"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "chain": "base",
          "native": "ETH",
          "est_cost": {
            "swap_200k": {
              "usd": 0.003599,
              "native": 0.000001127
            },
            "transfer_21k": {
              "usd": 0.000377,
              "native": 1.18e-7
            }
          },
          "native_usd": 3194.51,
          "base_fee_gwei": 0.004119,
          "gas_price_gwei": 0.008312,
          "priority_fee_gwei": {
            "p25": 0.001,
            "p50": 0.0015,
            "p75": 0.0031
          }
        }
      }
    },
    "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",
              "required": [],
              "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": {
                "chain": {
                  "type": "string"
                },
                "native": {
                  "type": "string"
                },
                "est_cost": {
                  "type": "object",
                  "description": "Estimated native + USD cost for transfer_21k and swap_200k."
                },
                "native_usd": {
                  "type": [
                    "number",
                    "null"
                  ]
                },
                "base_fee_gwei": {
                  "type": [
                    "number",
                    "null"
                  ]
                },
                "gas_price_gwei": {
                  "type": "number"
                },
                "priority_fee_gwei": {
                  "type": [
                    "object",
                    "null"
                  ],
                  "description": "Priority fee percentiles p25/p50/p75 in gwei."
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-17 06:19Z
Last indexed by Roundhouse
2026-09-24 08:00Z
Last enriched (probe, favicon, geo)
2026-09-11 16:46Z
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. 29 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/gas, 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.