MCP Server

Preflight SafeSwap

io.github.mr8-gif/preflight-safe-swap
Crypto & Web3 Security Public & reachable MCP 2026-07-28

What this MCP does

Preflights unsigned Solana transactions by comparing simulated effects with declared intent and policy.

preflight_transaction
Read-only Solana financial-action firewall. Compare an unsigned transaction's simulated effects with declared intent and principal policy. Returns PASS, FAIL, or REVIEW plus a signed verification receipt.
Input schema
{'type': 'object', 'required': ['intent', 'policy', 'unsignedTransaction'], 'properties': {'intent': {'type': 'object', 'description': 'Declared action, assets, amountAtomic, recipient, and protocol intent.'}, 'policy': {'type': 'object', 'description': 'Principal policy: allowedPrograms, allowedAccounts, maxSpendAtomic, maxFeeAtomic, and strictness.'}, 'unsignedTransaction': {'type': 'string', 'description': 'Base64 legacy or v0 Solana transaction. Preflight never signs it.'}}}
Added
preflight_transaction
Sept. 17, 2026, 12:45 p.m.