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mirrored listing x402 eip155:8453

Simulate a Base mainnet transaction before submitting it — real eth_estimateGas + eth_call

Simulate a Base mainnet transaction before submitting it — real eth_estimateGas + eth_call against the given {to, data, value}, returns whether it would succeed, estimated gas, and estimated cost. POST body required. Experimental/informational only — not financial advice.

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1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-14
updated

Provider

api.nexismvp.com · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x3B59f268EbC38c5F43B8B9bE37238bf43378Ad87",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "chain": "base",
          "data": "0x",
          "to": "0x3B59f268EbC38c5F43B8B9bE37238bf43378Ad87",
          "value": "0x0"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "estimated_cost_eth": 1e-7,
          "estimated_gas": 21000,
          "revert_reason": null,
          "will_succeed": true
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "chain": {
                  "description": "Only 'base' supported currently",
                  "enum": [
                    "base"
                  ],
                  "type": "string"
                },
                "data": {
                  "description": "Call data, 0x-prefixed hex (default 0x)",
                  "type": "string"
                },
                "to": {
                  "description": "Target address",
                  "type": "string"
                },
                "value": {
                  "description": "Value in wei, 0x-prefixed hex (default 0x0)",
                  "type": "string"
                }
              },
              "required": [
                "to"
              ],
              "type": "object"
            },
            "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": {
              "properties": {
                "estimated_cost_eth": {
                  "type": "number"
                },
                "estimated_gas": {
                  "type": "integer"
                },
                "revert_reason": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "will_succeed": {
                  "type": "boolean"
                }
              },
              "required": [
                "will_succeed"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://api.nexismvp.com/market/gas-preflight"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.nexismvp.com/market/gas-preflight");
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://api.nexismvp.com/market/gas-preflight")
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/6896.json, and this resource appears in /discovery/resources and /discovery/search.