Multichain Gas Oracle

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": "2000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://x402.professorsausages.com/gas-oracle/:chain/blob",
    "tags": [
      "gas",
      "fees",
      "eip1559",
      "l2",
      "evm"
    ],
    "mimeType": "application/json",
    "description": "EIP-4844 blob-gas market (Ethereum L1)",
    "serviceName": "Multichain Gas Oracle"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET"
        },
        "output": {
          "type": "object",
          "required": [
            "chain",
            "block",
            "blobBaseFee",
            "costPerBlob",
            "ethUsd"
          ],
          "properties": {
            "block": {
              "type": "integer"
            },
            "chain": {
              "type": "string"
            },
            "ethUsd": {
              "type": "number"
            },
            "fetchedAt": {
              "type": "string"
            },
            "blobBaseFee": {
              "type": "object"
            },
            "costPerBlob": {
              "type": "object"
            },
            "blobGasUsedRatio": {
              "type": "object"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object"
          },
          "output": {
            "type": "object"
          }
        }
      },
      "category": "defi",
      "routeTemplate": "https://x402.professorsausages.com/gas-oracle/:chain/blob"
    },
    "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 22 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"
    }
  },
  "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.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET"
      },
      "output": {
        "type": "object",
        "required": [
          "chain",
          "block",
          "blobBaseFee",
          "costPerBlob",
          "ethUsd"
        ],
        "properties": {
          "block": {
            "type": "integer"
          },
          "chain": {
            "type": "string"
          },
          "ethUsd": {
            "type": "number"
          },
          "fetchedAt": {
            "type": "string"
          },
          "blobBaseFee": {
            "type": "object"
          },
          "costPerBlob": {
            "type": "object"
          },
          "blobGasUsedRatio": {
            "type": "object"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      }
    },
    "category": "defi",
    "routeTemplate": "https://x402.professorsausages.com/gas-oracle/:chain/blob"
  },
  "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": "21 more agent-ready APIs you can call the same way (x402 pay-per-call). Full free catalog at the catalog URL; each serves a FREE real sample record (freeSample link) — taste before you pay. A few you might want:",
    "services": [
      {
        "call": "/token-safety?ref=xsell&v=menu&from=gas-oracle",
        "name": "Token Safety Check",
        "summary": "On-chain token risk screening for agents",
        "freeSample": "/token-safety/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/address-screen?ref=xsell&v=menu&from=gas-oracle",
        "name": "Address Risk Screen",
        "summary": "Crypto address risk screening for agents",
        "freeSample": "/address-screen/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/sanctions-screen?ref=xsell&v=menu&from=gas-oracle",
        "name": "OFAC Sanctions Name Screen",
        "summary": "Fuzzy OFAC name screening for agents with compliance duties",
        "freeSample": "/sanctions-screen/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/swap-quote?ref=xsell&v=menu&from=gas-oracle",
        "name": "DEX Swap Quote",
        "summary": "Read-only on-chain swap pricing for agents",
        "freeSample": "/swap-quote/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/ens-resolve?ref=xsell&v=menu&from=gas-oracle",
        "name": "ENS Resolver",
        "summary": "Spoof-safe ENS resolution for on-chain agents",
        "freeSample": "/ens-resolve/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/sec-10k?ref=xsell&v=menu&from=gas-oracle",
        "name": "SEC Annual Report (10-K)",
        "summary": "U.S",
        "freeSample": "/sec-10k/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/sec-10q?ref=xsell&v=menu&from=gas-oracle",
        "name": "SEC Quarterly Report (10-Q)",
        "summary": "U.S",
        "freeSample": "/sec-10q/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/sec-8k?ref=xsell&v=menu&from=gas-oracle",
        "name": "SEC Current Report (8-K)",
        "summary": "U.S",
        "freeSample": "/sec-8k/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/insider-trades?ref=xsell&v=menu&from=gas-oracle",
        "name": "Insider Trades",
        "summary": "SEC Form 4 insider transactions made agent-ready — who's buying and selling their own company's stock, norm…",
        "freeSample": "/insider-trades/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/13f-holdings?ref=xsell&v=menu&from=gas-oracle",
        "name": "13F Institutional Holdings",
        "summary": "What every institutional manager actually holds, made agent-ready — normalized SEC 13F-HR portfolios for ~8…",
        "freeSample": "/13f-holdings/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/macro?ref=xsell&v=menu&from=gas-oracle",
        "name": "US Macro Indicators",
        "summary": "WIP / FREE (BETA) — currently free while data coverage and freshness are expanded; pricing returns once pro…",
        "freeSample": "/macro/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/patent?ref=xsell&v=menu&from=gas-oracle",
        "name": "US Patent Search",
        "summary": "WIP / FREE (BETA) — currently free; the corpus is a small curated slice of landmark patents while the full…",
        "freeSample": "/patent/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/ipo-calendar?ref=xsell&v=menu&from=gas-oracle",
        "name": "IPO Calendar",
        "summary": "The US IPO pipeline straight from SEC EDGAR — public domain, no paid feed",
        "freeSample": "/ipo-calendar/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/fx-rates?ref=xsell&v=menu&from=gas-oracle",
        "name": "FX Reference Rates",
        "summary": "Daily reference FX rates for commerce and accounting agents",
        "freeSample": "/fx-rates/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/reader?ref=xsell&v=menu&from=gas-oracle",
        "name": "Web Reader & Screenshot",
        "summary": "Give your agent a real browser",
        "freeSample": "/reader/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/convert?ref=xsell&v=menu&from=gas-oracle",
        "name": "Document Convert (PDF/Image → Text)",
        "summary": "Document conversion tools for agents — hand over any PDF or image (public URL, base64, or raw POSTed bytes,…",
        "freeSample": "/convert/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/nft?ref=xsell&v=menu&from=gas-oracle",
        "name": "NFT Insight (Scam Check, Owners)",
        "summary": "NFT collection intelligence for agents — Ethereum now, Base next",
        "freeSample": "/nft/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/sfx?ref=xsell&v=menu&from=gas-oracle",
        "name": "8-bit SFX Generator",
        "summary": "Deterministic 8-bit sound-effect synthesis for agents — game-ready WAVs from a seed or preset in one paid c…",
        "freeSample": "/sfx/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/icons?ref=xsell&v=menu&from=gas-oracle",
        "name": "Icon Search",
        "summary": "Inline SVG icons for agents building UIs without CDN access — CSP blocks icon CDNs and hand-drawn path data…",
        "freeSample": "/icons/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/pokemon?ref=xsell&v=menu&from=gas-oracle",
        "name": "Pokemon API",
        "summary": "Pokemon knowledge base for agents",
        "freeSample": "/pokemon/sample?ref=xsell&v=menu&from=gas-oracle"
      },
      {
        "call": "/minecraft?ref=xsell&v=menu&from=gas-oracle",
        "name": "Minecraft Data",
        "summary": "Minecraft game data for agents — look up any block or item by name with properties, ids and metadata, list…",
        "freeSample": "/minecraft/sample?ref=xsell&v=menu&from=gas-oracle"
      }
    ],
    "strategy": "menu",
    "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=menu&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

2026-07-20 23:45Z

Last indexed by Roundhouse

2026-09-24 07:50Z

Last enriched (probe, favicon, geo)

2026-09-10 11:15Z

x402 version

2

Max timeout

60s

Liveness probe

HTTP 400