Agent Margin Router – Gas Fees: Live EIP-1559 gas fees (slow/standard/fast tiers) plus USD

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xf7a181bbe5d29924e800df4ba93418ef94f4e7c2",
    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "chain": "base"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "base_fee_gwei": 0.0051,
          "block_number": 21000000,
          "chain": "base",
          "chain_id": 8453,
          "cost_usdc": 0.005,
          "freshness_seconds": 0,
          "gas_price_gwei": 0.0062,
          "native_price_usd": 3412.5,
          "native_token": "ETH",
          "routing": {
            "cache_hit": false,
            "latency_ms": 310,
            "provider": "onchain"
          },
          "tiers": {
            "standard": {
              "cost_usd": {
                "swap": 0.0036,
                "transfer": 0.0005
              },
              "max_fee_gwei": 0.0071,
              "priority_fee_gwei": 0.001
            }
          },
          "trend": "stable"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "chain": {
                  "description": "base | ethereum | arbitrum | optimism | polygon (default base).",
                  "type": "string"
                },
                "max_age_seconds": {
                  "description": "Max cache age (default 10).",
                  "type": "integer"
                }
              },
              "required": []
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://agent-margin-router-production.up.railway.app/gas-fees"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://agent-margin-router-production.up.railway.app/gas-fees");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://agent-margin-router-production.up.railway.app/gas-fees")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header