{"slug":"mcp-dropenginehq-com-api-simulate-transaction-3a1ebc","title":"Simulates an unsigned Base or Base Sepolia EVM transaction with read-only RPC ca","host":"mcp.dropenginehq.com","method":"POST","resource":"https://mcp.dropenginehq.com/api/simulate-transaction","category":"code","description":"Simulates an unsigned Base or Base Sepolia EVM transaction with read-only RPC calls before an agent signs or broadcasts it. Returns execution/revert status, gas estimate, decoded top-level ERC-20 transfers and approvals, unlimited-approval warnings, and a risk signal. It never signs, holds keys, or ","price_listed":0.02,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"chain":"base","data":"0x","from":"0x1111111111111111111111111111111111111111","to":"0x1111111111111111111111111111111111111111","value":"0"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"chain":{"description":"Base mainnet, or Base Sepolia for test transactions.","enum":["base","base-sepolia"],"type":"string"},"data":{"description":"Unsigned transaction calldata; no signing material.","maxLength":131074,"pattern":"^0x([a-fA-F0-9]{2})*$","type":"string"},"from":{"pattern":"^0x[a-fA-F0-9]{40}$","type":"string"},"to":{"pattern":"^0x[a-fA-F0-9]{40}$","type":"string"},"value":{"description":"Native value in wei, as an integer string.","maxLength":78,"pattern":"^(0|[1-9][0-9]*)$","type":"string"}},"required":["chain","from","to","value","data"],"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"}},"required":["input"],"type":"object"},"history":[],"description_full":"Simulates an unsigned Base or Base Sepolia EVM transaction with read-only RPC calls before an agent signs or broadcasts it. Returns execution/revert status, gas estimate, decoded top-level ERC-20 transfers and approvals, unlimited-approval warnings, and a risk signal. It never signs, holds keys, or broadcasts. Standard RPC does not expose complete internal/token state diffs.","last_updated":"2026-09-28T09:53:15.936Z","schemes":["exact"]}