{
  "generated_at": "2026-04-24T15:01:35.625676+00:00",
  "slug": "transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
  "title": "Transaction Simulator \u00b7 Preview Transaction Outcomes",
  "url": "https://transaction-simulator-production.up.railway.app/entrypoints/simulate-transaction/invoke",
  "category": "finance",
  "summary": "Simulate transaction execution to preview gas costs, detect asset transfers, and predict failures before on-chain submission.",
  "seo": {
    "title": "EVM Transaction Simulator API - x402 Pay-Per-Call",
    "description": "Simulate Ethereum transactions before execution. Preview gas costs, asset changes, and failure prediction. Pay 0.03 USDC per simulation on Base via x402."
  },
  "use_cases": [
    "Validate transaction safety before wallet signing",
    "Preview gas costs for complex contract interactions",
    "Detect unexpected asset transfers in transaction traces",
    "Predict transaction failures and revert reasons"
  ],
  "ideal_buyer": "DeFi trading agents, wallet applications, and security tools requiring pre-flight transaction validation and risk assessment.",
  "example_prompt": "Simulate this transaction to see what assets will change and if it will fail",
  "example_request_body": {},
  "risk_notes": [],
  "pricing_sanity": {
    "flag": "normal",
    "ratio": 1,
    "median_category_atomic": 30000
  },
  "pricing_review_required": false,
  "pricing_decimal_suspect": false,
  "trust_tier": "indexed_external",
  "accepts": [
    {
      "scheme": "exact",
      "network": "base",
      "pay_to": "0x01d11f7e1a46abfc6092d7be484895d2d505095c",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "max_amount_required_atomic": "30000",
      "max_timeout_seconds": 300,
      "mime_type": "application/json",
      "description": "Simulate a transaction to preview outcomes before execution - gas costs, asset changes, and failure prediction",
      "verified": false,
      "hints": {
        "input": {
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "bodyFields": {
            "data": {
              "type": "string",
              "required": false,
              "description": "Transaction data (0x... for contract calls)"
            },
            "value": {
              "type": "string",
              "required": false,
              "description": "Value to send in hex wei (e.g. 0x0 for no value)"
            },
            "chain_id": {
              "type": "integer",
              "required": true,
              "description": "Chain ID (1=Ethereum, 56=BSC, 137=Polygon, 42161=Arbitrum, 10=Optimism, 8453=Base, 43114=Avalanche)"
            },
            "to_address": {
              "type": "string",
              "required": true,
              "description": "Recipient/contract address (0x...)"
            },
            "from_address": {
              "type": "string",
              "required": true,
              "description": "Sender address (0x...)"
            }
          }
        },
        "output": {
          "type": "object",
          "required": [
            "success",
            "gas_used",
            "gas_cost_eth",
            "gas_cost_usd",
            "chain_id"
          ],
          "properties": {
            "error": {
              "type": [
                "string",
                "null"
              ],
              "description": "Error message if simulation failed"
            },
            "success": {
              "type": "boolean",
              "description": "Whether the transaction is expected to succeed"
            },
            "chain_id": {
              "type": "integer",
              "description": "Chain ID where simulation was performed"
            },
            "gas_used": {
              "type": "integer",
              "description": "Estimated gas units consumed"
            },
            "warnings": {
              "type": "array",
              "items": {
                "type": "string"
              },
              "description": "Warnings about the transaction"
            },
            "gas_cost_eth": {
              "type": "number",
              "description": "Gas cost in ETH/native currency"
            },
            "gas_cost_usd": {
              "type": "number",
              "description": "Gas cost in USD"
            },
            "asset_changes": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "to": {
                    "type": "string",
                    "description": "Destination address"
                  },
                  "from": {
                    "type": "string",
                    "description": "Source address"
                  },
                  "symbol": {
                    "type": "string",
                    "description": "Token symbol"
                  },
                  "amount_eth": {
                    "type": "number",
                    "description": "Amount in ETH"
                  },
                  "amount_wei": {
                    "type": "string",
                    "description": "Amount in wei"
                  },
                  "asset_type": {
                    "type": "string",
                    "description": "NATIVE, ERC20, or ERC721"
                  },
                  "change_type": {
                    "type": "string",
                    "description": "TRANSFER, MINT, BURN"
                  }
                }
              },
              "description": "Detected asset transfers"
            },
            "gas_price_gwei": {
              "type": "number",
              "description": "Current gas price in gwei"
            },
            "simulation_method": {
              "type": "string",
              "description": "Method used: eth_call, tenderly, or error"
            }
          },
          "description": "Transaction simulation results with gas estimates and asset changes"
        }
      }
    }
  ],
  "origin": {
    "slug": "transaction-simulator-production-up-railway-app",
    "host": "transaction-simulator-production.up.railway.app",
    "title": "Transaction Simulator API",
    "description": "An x402-payable API origin hosted on Railway. No public homepage content is currently available; the service appears to be in a non-responsive or misconfigured state.",
    "url": "https://transaction-simulator-production.up.railway.app",
    "favicon": "https://transaction-simulator-production.up.railway.app/favicon.ico"
  },
  "json_ld": {
    "@id": "https://x402all.com/resource/transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
    "url": "https://x402all.com/resource/transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
    "name": "Transaction Simulator \u00b7 Preview Transaction Outcomes",
    "@type": "WebAPI",
    "offers": {
      "url": "https://x402all.com/resource/transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
      "@type": "Offer",
      "price": "0.03",
      "availability": "https://schema.org/InStock",
      "priceCurrency": "USDC",
      "priceSpecification": {
        "@type": "UnitPriceSpecification",
        "price": "0.030000",
        "unitText": "call",
        "priceCurrency": "USDC"
      },
      "eligibleCustomerType": "Agent",
      "additionalProperty": [
        {
          "@type": "PropertyValue",
          "name": "paymentNetwork",
          "value": "base"
        },
        {
          "@type": "PropertyValue",
          "name": "paymentAsset",
          "value": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      ]
    },
    "sameAs": "https://transaction-simulator-production.up.railway.app/entrypoints/simulate-transaction/invoke",
    "@context": "https://schema.org",
    "provider": {
      "@id": "https://x402all.com/server/transaction-simulator-production-up-railway-app",
      "url": "https://transaction-simulator-production.up.railway.app",
      "name": "Transaction Simulator API",
      "@type": "Organization"
    },
    "identifier": "transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
    "description": "Simulate Ethereum transactions before execution. Preview gas costs, asset changes, and failure prediction. Pay 0.03 USDC per simulation on Base via x402.",
    "potentialAction": {
      "@type": "BuyAction",
      "target": "https://axon402.com/test-buy?resource=transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke",
      "description": "Test-buy this endpoint on AXON"
    },
    "applicationCategory": "finance"
  },
  "axon_deep_link": "https://axon402.com/test-buy?resource=transaction-simulator-production-up-railway-app-entrypoints-simulate-transaction-invoke"
}