Api Endpoint

base-simulate

Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.

Open interactive test console

Offering

Provider: x402.agentindex.world
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Blockchain And Crypto
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://x402.agentindex.world/base/simulate
MIME type: application/json
First seen: 2026-10-16T01:50:38.788Z
Last seen: 2026-11-02T11:57:21.878Z
Tags: simulate transaction base, transaction simulation, base rpc, eth_call, revert reason

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
  }
]

Observed health

Status: Reachable
Latest latency: 1164 ms
Average latency: 922 ms
HTTP status: 405
Last checked: 2026-11-02T14:09:26.199Z
Reachability: 100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {
        "from_address": {
          "title": "From Address",
          "type": "string"
        },
        "to": {
          "title": "To",
          "type": "string"
        },
        "data": {
          "default": "0x",
          "title": "Data",
          "type": "string"
        },
        "value_wei": {
          "default": 0,
          "title": "Value Wei",
          "type": "integer"
        }
      },
      "required": [
        "from_address",
        "to"
      ],
      "title": "SimulateInput",
      "type": "object"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "will_succeed": {
          "title": "Will Succeed",
          "type": "boolean"
        },
        "gas_estimate": {
          "anyOf": [
            {
              "type": "integer"
            },
            {
              "type": "null"
            }
          ],
          "title": "Gas Estimate"
        },
        "revert_reason": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "title": "Revert Reason"
        },
        "return_data": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "title": "Return Data"
        }
      },
      "required": [
        "will_succeed",
        "gas_estimate",
        "revert_reason",
        "return_data"
      ],
      "title": "SimulateOutput"
    }
  },
  "required": [
    "type"
  ]
}