{"sample":true,"free":true,"note":"Static example of the paid response shape (not live data). Drop sample=1 and pay via x402 for live data. Failed calls (4xx/5xx) are never charged.","path":"/crypto/tx-simulate","price_usdc":"0.003000","pay_url":"https://kr-x402-mvp.kgy5612.workers.dev/crypto/tx-simulate?from=0xe4be4d0bd82d8e68203deff81f79ede0529f2617&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&data=0xa9059cbb000000000000000000000000a587d73489f8f09d1975f1ddbb1c61c93e8fa9d700000000000000000000000000000000000000000000000000000000000003e8","input_schema":{"type":"object","properties":{"from":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"Sender (signer) address","examples":["0xe4be4d0bd82d8e68203deff81f79ede0529f2617"]},"to":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"Target contract or recipient","examples":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"]},"data":{"type":"string","pattern":"^0x([0-9a-fA-F]{2})*$","description":"Calldata (default 0x)"},"value_eth":{"type":"string","description":"ETH to send, decimal (default 0)","examples":["0.01"]},"calls":{"type":"string","description":"URL-encoded JSON array of up to 5 {to,data,value_eth|value} run in order from the same sender"}},"additionalProperties":false},"example":{"chain":"base","block":53272234,"from":"0xe4be4d0bd82d8e68203deff81f79ede0529f2617","success":true,"verdict":"SAFE_TO_SEND","calls":[{"index":0,"to":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","function":"transfer(address,uint256)","success":true,"revert_reason":null,"gas_used":45047}],"transfers":[{"token":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","symbol":"USDC","from":"0xe4be4d0bd82d8e68203deff81f79ede0529f2617","to":"0xa587d73489f8f09d1975f1ddbb1c61c93e8fa9d7","amount":0.001}],"balance_changes":{"0xe4be4d0bd82d8e68203deff81f79ede0529f2617":{"USDC":-0.001},"0xa587d73489f8f09d1975f1ddbb1c61c93e8fa9d7":{"USDC":0.001}},"sender_changes":{"USDC":-0.001},"approvals":[],"gas_used_total":45047,"fee_eth":5e-7,"fee_usd":0.0019,"flags":[],"summary":"1 call succeeds; sender sends 0.001 USDC","next":["/crypto/base-gas","/crypto/tx-status?hash="]},"start_here":"https://kr-x402-mvp.kgy5612.workers.dev/crypto/ping"}