Multichain Gas Oracle

Name: Multichain Gas Oracle
Price: 0.03 USDC
Availability: InStock

Professor Sausages

TradingLiveeip155:8453Exactvia cdp

https://x402.professorsausages.com/gas-oracle/compare

GasFeeseip1559L2Evm

Calls · 30d

1→ 0%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 28 snapshots so far.

$4.34

Verified settled volume

329 settlements proven x402 by their on-chain EIP-3009 marker.

$0.030

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

Last called 2026-08-23 02:18Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x54ebFCF3870439B9db62381848c5DabC05c70d5B

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.

{
  "error": "payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
      "amount": "30000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://x402.professorsausages.com/gas-oracle/compare",
    "tags": [
      "gas",
      "fees",
      "eip1559",
      "l2",
      "evm"
    ],
    "mimeType": "application/json",
    "description": "Cheapest-chain ranking: all supported chains by all-in USD tx cost",
    "serviceName": "Multichain Gas Oracle"
  },
  "extensions": {
    "help": {
      "docs": "https://x402.professorsausages.com/gas-oracle",
      "sample": "https://x402.professorsausages.com/gas-oracle/sample",
      "example": "https://x402.professorsausages.com/gas-oracle/compare",
      "openapi": "https://x402.professorsausages.com/gas-oracle/openapi.json"
    },
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "gas": "Gas limit to price.",
            "speed": "Fee tier used for ranking.",
            "txType": "Transaction preset. Overrides gas and sets the L1 calldata size."
          }
        },
        "output": {
          "type": "object",
          "required": [
            "gasUsed",
            "speed",
            "ranking",
            "cheapest",
            "savingsVsEthereumUsd",
            "degraded"
          ],
          "properties": {
            "about": {
              "type": "string",
              "description": "What this response is and where its data comes from, in one sentence."
            },
            "speed": {
              "type": "string"
            },
            "txType": {
              "type": [
                "string",
                "null"
              ]
            },
            "gasUsed": {
              "type": "integer"
            },
            "ranking": {
              "type": "array",
              "items": {
                "type": "object"
              }
            },
            "related": {
              "type": "object",
              "description": "Next steps as paths on this origin. Each is priced by its own 402 challenge; GET /.well-known/x402 prices the whole origin in one free call.",
              "additionalProperties": {
                "type": "string"
              }
            },
            "cheapest": {
              "type": [
                "string",
                "null"
              ]
            },
            "degraded": {
              "type": "array",
              "items": {
                "type": "object"
              }
            },
            "fetchedAt": {
              "type": "string"
            },
            "freshness": {
              "type": "object",
              "required": [
                "tier",
                "as_of",
                "age_seconds",
                "max_age_seconds"
              ],
              "properties": {
                "note": {
                  "type": "string"
                },
                "tier": {
                  "type": "string",
                  "example": "nightly"
                },
                "as_of": {
                  "type": "string",
                  "description": "Newest datum this answer is based on (ISO 8601)."
                },
                "age_seconds": {
                  "type": "integer",
                  "minimum": 0
                },
                "max_age_seconds": {
                  "type": [
                    "integer",
                    "null"
                  ],
                  "minimum": 0
                }
              },
              "description": "How fresh the data is, measured when you called. `age_seconds` is the number to act on; `max_age_seconds` is the refresh cadence (null = deterministic, cannot go stale)."
            },
            "savingsVsEthereumUsd": {
              "type": "number"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object"
          },
          "output": {
            "type": "object"
          }
        }
      },
      "category": "defi",
      "routeTemplate": "https://x402.professorsausages.com/gas-oracle/compare"
    },
    "sample": {
      "url": "https://x402.professorsausages.com/gas-oracle/sample",
      "hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
    },
    "catalog": {
      "message": "This endpoint is 1 of 35 pay-per-call APIs for agents — all same x402 payment + auth. Browse the full menu free (no payment) at the catalog URL; every API serves a free real sample record at /<api>/sample.",
      "strategy": "minimal",
      "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=minimal&from=gas-oracle"
    },
    "suggest": {
      "url": "https://x402.professorsausages.com/suggest",
      "hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
    },
    "discount": {
      "off": "50%",
      "hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
      "header": "X-Intent"
    },
    "how_to_pay": {
      "hint": "Wrap the fetch/axios you already use: on a 402 it pays this quote (USDC on Base) and retries. npm i <install>; save code as pay.mjs; BUYER_PRIVATE_KEY=<dedicated wallet key> node pay.mjs",
      "axios": {
        "code": "import axios from\"axios\";import{wrapAxiosWithPayment,x402Client}from\"@x402/axios\";import{registerExactEvmScheme}from\"@x402/evm/exact/client\";import{privateKeyToAccount}from\"viem/accounts\";\nconst c=new x402Client();registerExactEvmScheme(c,{signer:privateKeyToAccount(process.env.BUYER_PRIVATE_KEY)});\nconst{data}=await wrapAxiosWithPayment(axios.create(),c).get(\"https://x402.professorsausages.com/gas-oracle/compare\");console.log(data);",
        "install": [
          "@x402/axios",
          "@x402/evm",
          "viem",
          "axios"
        ]
      },
      "fetch": {
        "code": "import{wrapFetchWithPayment,x402Client}from\"@x402/fetch\";import{registerExactEvmScheme}from\"@x402/evm/exact/client\";import{privateKeyToAccount}from\"viem/accounts\";\nconst c=new x402Client();registerExactEvmScheme(c,{signer:privateKeyToAccount(process.env.BUYER_PRIVATE_KEY)});\nconst r=await wrapFetchWithPayment(fetch,c)(\"https://x402.professorsausages.com/gas-oracle/compare\");console.log(await r.json());",
        "install": [
          "@x402/fetch",
          "@x402/evm",
          "viem"
        ]
      },
      "skill": "https://x402.professorsausages.com/skills",
      "key_env": "BUYER_PRIVATE_KEY"
    }
  },
  "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.

0.03USDC≈ $0.03 USD

on Base · exact scheme

Pay 0.03 USDC on Base to 0x54eb…70d5B. The signed payment is good for 1 minute.

Paid to: 0x54eb…70d5B
USD Coin contract: 0x8335…02913
Payment window: 1 minute
As published: 30000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
    "amount": "30000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "help": {
    "docs": "https://x402.professorsausages.com/gas-oracle",
    "sample": "https://x402.professorsausages.com/gas-oracle/sample",
    "example": "https://x402.professorsausages.com/gas-oracle/compare",
    "openapi": "https://x402.professorsausages.com/gas-oracle/openapi.json"
  },
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "gas": "Gas limit to price.",
          "speed": "Fee tier used for ranking.",
          "txType": "Transaction preset. Overrides gas and sets the L1 calldata size."
        }
      },
      "output": {
        "type": "object",
        "required": [
          "gasUsed",
          "speed",
          "ranking",
          "cheapest",
          "savingsVsEthereumUsd",
          "degraded"
        ],
        "properties": {
          "speed": {
            "type": "string"
          },
          "txType": {
            "type": [
              "string",
              "null"
            ]
          },
          "gasUsed": {
            "type": "integer"
          },
          "ranking": {
            "type": "array",
            "items": {
              "type": "object"
            }
          },
          "cheapest": {
            "type": [
              "string",
              "null"
            ]
          },
          "degraded": {
            "type": "array",
            "items": {
              "type": "object"
            }
          },
          "fetchedAt": {
            "type": "string"
          },
          "savingsVsEthereumUsd": {
            "type": "number"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      }
    },
    "category": "defi",
    "routeTemplate": "https://x402.professorsausages.com/gas-oracle/compare"
  },
  "sample": {
    "url": "https://x402.professorsausages.com/gas-oracle/sample",
    "hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
  },
  "catalog": {
    "message": "You called Multichain Gas Oracle. Agents doing defi work commonly also use these — same pay-per-call model, each with a FREE real sample record (freeSample link):",
    "related": [
      {
        "call": "/swap-quote?ref=xsell&v=related&from=gas-oracle",
        "name": "DEX Swap Quote",
        "summary": "Read-only on-chain swap pricing for agents",
        "freeSample": "/swap-quote/sample?ref=xsell&v=related&from=gas-oracle"
      }
    ],
    "strategy": "related",
    "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=related&from=gas-oracle"
  },
  "suggest": {
    "url": "https://x402.professorsausages.com/suggest",
    "hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
  },
  "discount": {
    "off": "50%",
    "hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
    "header": "X-Intent"
  }
}

Provenance

Seen in the source catalog: 2026-08-23 02:18Z
Last indexed by Roundhouse: 2026-09-22 02:00Z
Last enriched (probe, favicon, geo): 2026-09-25 07:15Z
x402 version: 2
Max timeout: 60s
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. 28 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 Multichain Gas Oracle 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=Multichain%20Gas%20Oracle'
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://x402.professorsausages.com/gas-oracle/compare, 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.