Roundhouse

Gas Estimate

Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {tx|to|value|data}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated cost...

TradingLiveeip155:8453Exactvia facilitator:payAI
https://6xrkjcfa3yrzvefcpvanurzou4.srv.us/gas-estimate
GasEstimatePriceBaseFee
Settlements · 30d
1↓ 100%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
–
Verified settled volume
1 settlements proven x402 by their on-chain EIP-3009 marker.
$0.00
Listed price
As published in the catalog. Always read the live 402 before paying.
–
Calls · 30d
Upstream's own call count for this endpoint, not ours.
–
Unique payers · 30d
Never called
–
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xCa0a6c6Aa7A8F0D5893636CF166Ea2b44fb6500c

The wallet the 402 directs payment to. Its full payment record 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.

Recent payments · which agents last used it

Every indexed settlement paid to this service’s wallet, newest first. The index does not record which endpoint a payment was for, so if this wallet serves more than one endpoint, the rows include payments for the others. Paged up to the newest 5,000; the full history is on the merchant page.

Payer PayeeChainAmountx402RouteAgeTxn hash
0x5374…a2410xca0a…500cBaseBase$0.00100%payAI11d ago0x852f9f…437169

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change. Always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xCa0a6c6Aa7A8F0D5893636CF166Ea2b44fb6500c",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://6xrkjcfa3yrzvefcpvanurzou4.srv.us/gas-estimate",
      "extensions": {
        "bazaar": {
          "info": {
            "input": {
              "type": "http",
              "method": "GET",
              "queryParams": {
                "tx": "example",
                "sample": "1"
              }
            },
            "output": {
              "type": "json",
              "example": {
                "data": {
                  "ok": true,
                  "note": "The response shape for this route is declared in /openapi.json under this path.",
                  "source": "live"
                },
                "path": "/gas-estimate",
                "success": true
              }
            },
            "description": "Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {{tx|to|value|data}}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated..."
          },
          "schema": {
            "type": "object",
            "$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"
                  }
                },
                "additionalProperties": false
              },
              "output": {
                "type": "object",
                "required": [
                  "type"
                ],
                "properties": {
                  "type": {
                    "type": "string"
                  },
                  "example": {
                    "type": "object"
                  }
                }
              }
            }
          }
        }
      },
      "description": "Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {{tx|to|value|data}}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated...",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://6xrkjcfa3yrzvefcpvanurzou4.srv.us/gas-estimate",
    "tags": [
      "gas",
      "estimate",
      "price",
      "base",
      "fee",
      "transaction",
      "cost"
    ],
    "iconUrl": "https://6xrkjcfa3yrzvefcpvanurzou4.srv.us/icon.png",
    "mimeType": "application/json",
    "description": "Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {{tx|to|value|data}}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated...",
    "serviceName": "Gas Estimate"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "tx": "example",
            "sample": "1"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "ok": true,
              "note": "The response shape for this route is declared in /openapi.json under this path.",
              "source": "live"
            },
            "path": "/gas-estimate",
            "success": true
          }
        },
        "description": "Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {{tx|to|value|data}}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated..."
      },
      "schema": {
        "type": "object",
        "$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"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "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.

0USDC≈ $0 USD
on Base · exact scheme

Pay 0 USDC on Base to 0xCa0a…6500c. The signed payment is good for 2 minutes.

Paid to
0xCa0a…6500c
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
0 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xCa0a6c6Aa7A8F0D5893636CF166Ea2b44fb6500c",
    "amount": "0",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "to": "example",
          "tx": "example",
          "data": "example",
          "value": "example",
          "sample": "1"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "ok": true,
            "note": "The response shape for this route is declared in /openapi.json under this path.",
            "source": "live"
          },
          "path": "/gas-estimate",
          "success": true
        }
      },
      "description": "Gas estimate on Base - the current gas price, base fee, priority fee and a transaction cost estimate in USDC (cycle 231, x402 $0.01) - GET ?sample=1|2|3 OR ?tx=<TO_JSON> OR POST application/json {tx|to|value|data}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the gas price in wei and gwei, the base fee, the priority fee, the chain id, the head block number and its timestamp, the estimated gas units for a plain transfer and the estimated cost..."
    },
    "schema": {
      "type": "object",
      "$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"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-28 14:37Z
Last indexed by Roundhouse
2026-10-31 16:15Z
Last enriched (probe, favicon, geo)
2026-10-29 06:16Z
x402 version
2
Max timeout
120s
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 Gas Estimate 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=Gas%20Estimate'
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://6xrkjcfa3yrzvefcpvanurzou4.srv.us/gas-estimate, 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. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.