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mirrored listing x402 eip155:8453solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp

Base gas oracle from Otto's own RPC: current base fee (wei+gwei), legacy gas price, and sl

Base gas oracle from Otto's own RPC: current base fee (wei+gwei), legacy gas price, and slow/standard/fast EIP-1559 priority-fee tiers (p25/p50/p90 over the last 20 blocks) with a ready-to-sign maxFeePerGas per tier. Unlike the crowded gas shelf it PUBLISHES the formula, so every tier is reproducible from the response. Flat JSON, refreshed every minute. Base gas oracle, gas price, priority fee, EIP-1559, maxFeePerGas. $0.001 per call.

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1000 (raw units)
price
4
calls / 30d
3
unique payers
2026-09-08
updated

Provider

x402.ottoai.services · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {},
        "type": "http"
      },
      "output": {
        "example": {
          "data": {
            "baseFeePerGas": {
              "gwei": 0.005,
              "wei": "5000000"
            },
            "chain": "base",
            "chainId": 8453,
            "formula": "priorityFee tiers = mean of the p25/p50/p90 priority-fee tips over the last 20 blocks (eth_feeHistory); suggested maxFeePerGas = baseFeePerGas*2 + tierTip.",
            "gasPrice": {
              "gwei": 0.006,
              "wei": "6000000"
            },
            "generatedAt": "2026-09-01T12:01:00.000Z",
            "priorityFeePerGas": {
              "fast": 0.0025,
              "slow": 0,
              "standard": 0.00025,
              "unit": "gwei"
            },
            "suggested": {
              "fast": {
                "maxFeePerGasGwei": 0.0125,
                "maxFeePerGasWei": "12500000",
                "maxPriorityFeePerGasGwei": 0.0025
              },
              "slow": {
                "maxFeePerGasGwei": 0.01,
                "maxFeePerGasWei": "10000000",
                "maxPriorityFeePerGasGwei": 0
              },
              "standard": {
                "maxFeePerGasGwei": 0.01025,
                "maxFeePerGasWei": "10250000",
                "maxPriorityFeePerGasGwei": 0.00025
              }
            },
            "window": {
              "avgGasUsedRatio": 0.1132,
              "blocks": 20,
              "congestion": "low",
              "oldestBlock": 50738536
            }
          },
          "meta": {
            "degraded": false,
            "generatedAt": "",
            "stalenessSec": 0,
            "validUntil": ""
          },
          "status": "success"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {},
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "data": {},
                "meta": {
                  "type": "object"
                },
                "reason": {
                  "description": "status=unavailable only; every >=400 is UNCHARGED",
                  "type": "string"
                },
                "status": {
                  "enum": [
                    "success",
                    "unavailable"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "status"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "builder-code": {
    "info": {
      "a": "bc_hc2dhq09"
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "additionalProperties": false,
      "properties": {
        "a": {
          "description": "App builder code",
          "pattern": "^[a-z0-9_]{1,32}$",
          "type": "string"
        },
        "s": {
          "description": "Service builder codes",
          "items": {
            "pattern": "^[a-z0-9_]{1,32}$",
            "type": "string"
          },
          "type": "array"
        },
        "w": {
          "description": "Wallet builder code",
          "pattern": "^[a-z0-9_]{1,32}$",
          "type": "string"
        }
      },
      "type": "object"
    }
  },
  "offer-receipt": {
    "info": {
      "offers": [
        {
          "acceptIndex": 0,
          "format": "eip712",
          "payload": {
            "amount": "1000",
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "network": "eip155:8453",
            "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
            "resourceUrl": "https://x402.ottoai.services/gas-oracle",
            "scheme": "exact",
            "validUntil": 1788854695,
            "version": 1
          },
          "signature": "0x5a0f117711a662c1f54cac970836da1b9bbe56c507240a9aae0ed65195786f54166c4ac88a22d616005c3c4ecc2584687881635e4914c6be2bd9ff96436d0fff1b"
        },
        {
          "acceptIndex": 1,
          "format": "eip712",
          "payload": {
            "amount": "1000",
            "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
            "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
            "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
            "resourceUrl": "https://x402.ottoai.services/gas-oracle",
            "scheme": "exact",
            "validUntil": 1788854695,
            "version": 1
          },
          "signature": "0x5eedd13b3911f2255f201d13f213bbcd3caba1f346d273b9c7828f7f2087a2f85191dabb6c9f1f0bc6aca191f3297abd6ed52ade55c9e0a4003d8e39741cb4751c"
        }
      ]
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "offers": {
          "items": {
            "properties": {
              "acceptIndex": {
                "type": "integer"
              },
              "format": {
                "type": "string"
              },
              "payload": {
                "properties": {
                  "amount": {
                    "type": "string"
                  },
                  "asset": {
                    "type": "string"
                  },
                  "network": {
                    "type": "string"
                  },
                  "payTo": {
                    "type": "string"
                  },
                  "resourceUrl": {
                    "type": "string"
                  },
                  "scheme": {
                    "type": "string"
                  },
                  "validUntil": {
                    "type": "integer"
                  },
                  "version": {
                    "type": "integer"
                  }
                },
                "required": [
                  "version",
                  "resourceUrl",
                  "scheme",
                  "network",
                  "asset",
                  "payTo",
                  "amount"
                ],
                "type": "object"
              },
              "signature": {
                "type": "string"
              }
            },
            "required": [
              "format",
              "signature"
            ],
            "type": "object"
          },
          "type": "array"
        }
      },
      "required": [
        "offers"
      ],
      "type": "object"
    }
  },
  "otto-content-receipt": {}
}

Use it

curl

curl "https://x402.ottoai.services/gas-oracle"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402.ottoai.services/gas-oracle");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://x402.ottoai.services/gas-oracle")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/194.json, and this resource appears in /discovery/resources and /discovery/search.