This tool is no longer present in the server's latest manifest. Showing the last observed version (server version 1.28.0).
onyx_base_tx_simulator
InactiveTool of onyx-paid-mcp
declared in 1.28.0
Simulate a Base mainnet transaction before sending it. Returns success/revert prediction, the revert reason if any, decoded return data, and an estimated gas figure. Use as a pre-flight check inside a trading agent's tool-call dispatcher — agents should simulate before signing to avoid paying gas on a doomed tx. Direct equivalent of OATP's Solana tx_simulator ($0.20, 1,304 unique paying agents) — Onyx is the first to ship this on Base mainnet at $0.10. Read-only — never submits. (price: $0.10 USDC, tier: metered)
Parameters schema
{
"type": "object",
"required": [
"to_address"
],
"properties": {
"data": {
"type": "string",
"description": "Hex-encoded calldata (default 0x)"
},
"block": {
"type": "string",
"description": "block tag (latest/pending/0x...) default latest"
},
"value_wei": {
"type": "string",
"description": "ETH wei to send (default 0)"
},
"to_address": {
"type": "string",
"description": "0x-prefixed contract or wallet"
},
"from_address": {
"type": "string",
"description": "0x-prefixed sender"
}
}
}Parent server
onyx-paid-mcp
https://github.com/dimitrilaouanis-tech/onyx-mcp
2/7 registries