{
  "x402Version": 2,
  "id": 5089,
  "slug": "5089",
  "resource": "https://api.seneschal.space/v1/q/base-fee",
  "description": "Single-fact: what does Ethereum mainnet gas cost RIGHT NOW? Returns the latest block’s base fee + blob base fee AND the consensus-computed next-block projection (not a guess — the protocol’s own EIP-1559/4844 arithmetic), straight from eth_feeHistory. Fields: {block, base_fee_gwei, blob_base_fee_gwei, gas_used_ratio, next_base_fee_gwei, next_blob_base_fee_gwei}. Bulk per-block history: /v1/premium/fee-history.csv ($0.05, up to 1024 blocks/call).",
  "type": "http",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x46Ba634261566CF242c853d1f49511f9268ba674",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "1000",
      "maxTimeoutSeconds": 120
    }
  ],
  "outputSchema": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {},
          "type": "http"
        },
        "output": {
          "example": {
            "as_of_ms": 1765532000000,
            "base_fee_gwei": 0.74721396,
            "base_fee_wei": "747213960",
            "blob_base_fee_gwei": 1e-9,
            "blob_base_fee_wei": "1",
            "blob_gas_used_ratio": 0.25,
            "block": 23012001,
            "gas_used_ratio": 0.4993,
            "next_base_fee_gwei": 0.747189,
            "next_blob_base_fee_gwei": 1e-9,
            "next_block": 23012002
          },
          "type": "json"
        }
      },
      "schema": {
        "$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": {
                  "as_of_ms": {
                    "type": "integer"
                  },
                  "base_fee_gwei": {
                    "type": "number"
                  },
                  "base_fee_wei": {
                    "type": "string"
                  },
                  "blob_base_fee_gwei": {
                    "type": "number"
                  },
                  "blob_base_fee_wei": {
                    "type": "string"
                  },
                  "blob_gas_used_ratio": {
                    "type": "number"
                  },
                  "block": {
                    "type": "integer"
                  },
                  "gas_used_ratio": {
                    "type": "number"
                  },
                  "next_base_fee_gwei": {
                    "type": "number"
                  },
                  "next_blob_base_fee_gwei": {
                    "type": "number"
                  },
                  "next_block": {
                    "type": "integer"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "bazaar"
  ],
  "sourceHost": "api.seneschal.space",
  "lastUpdated": "2026-09-08T08:04:22.039Z",
  "quality": {
    "calls30d": 4,
    "uniquePayers30d": 3,
    "lastCalledAt": "2026-09-08T08:04:21.45Z"
  },
  "liveness": {},
  "verified": false,
  "featured": false,
  "provider": {
    "host": "api.seneschal.space",
    "manifest_name": "api.seneschal.space",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-09-18T22:00:31.484Z"
  }
}