Early access

An MCP server that simulates and risk-checks every transaction an AI agent wants to sign, before it signs.

It works at the transaction level for any agent framework, rather than being another agent wallet. It returns machine-readable reasons so the agent can adjust and retry, not just fail.

Launch app Read the docs

Core features: 5
Status: Early access
Network: Solana
Your funds: Non-custodial

MCP server exposing a check_transaction tool that simulates a transaction and returns balance changes, programs touchedToken checks: mint and freeze authority, top holder concentration, liquidity depth and slippage versus the requestedRules file in plain YAML (max size per trade, allowed programs, blocked tokens) with the reason for each verdictPublic verdict log with shareable permalinks so a builder can show why a trade was blockedWeb playground where anyone can paste a transaction and see the decoded result

Preflight control

OwnerSets rules

AgentProposes

PolicyChecks

ExecutionSettles

Recent runs

Agent	Action	Amount	Result
Dope agent	Swap within limit	$4.4K	Needs approval
Rifa agent	Swap within limit	$4.7K	Executed
Nepe agent	Claim rewards	$450	Executed

Spending limit

$1.3K of $10.0K used today

Policies

Allowlisted programs only

Approval above $2,500

Approvals

Swap within limitwaiting

Features

What you get with Preflight.

Built for builders of Solana trading and portfolio agents, funds running automated strategies, and power users who let agents prepare transactions for them.

MCP server exposing a check_transaction tool that simulates a transaction and returns balance changes, programs touched
Planned
Token checks: mint and freeze authority, top holder concentration, liquidity depth and slippage versus the requested
Planned
Rules file in plain YAML (max size per trade, allowed programs, blocked tokens) with the reason for each verdict
Planned
Public verdict log with shareable permalinks so a builder can show why a trade was blocked
Planned
Web playground where anyone can paste a transaction and see the decoded result
Planned

Activity

Token checks: mint and freeze authority, top holder concentration, liquidity depth and slippage versus the requested.

Every proposal, check and result in one log. Filter by agent, see why something was blocked, and export it for review.

Planned

Activity

Agent	Action	Amount	Result
Dope agent	Swap within limit	$4.4K	Needs approval
Rifa agent	Swap within limit	$4.7K	Executed
Nepe agent	Claim rewards	$450	Executed
Ripe agent	Pay invoice	$4.1K	Executed
Tomor agent	Bridge request	$4.6K	Executed
Sado agent	Bridge request	$2.2K	Executed

Policies

MCP server exposing a check_transaction tool that simulates a transaction and returns balance changes, programs touched.

Write the rules once, in plain settings. Every action an agent proposes is checked against them before anything is signed.

Planned

Policy: treasury agent

active

Allowlisted programs only

Require approval above $2,500

Block new counterparties

Pause outside 08:00 to 22:00

Daily limit$10,000

Controls

Rules file in plain YAML (max size per trade, allowed programs, blocked tokens) with the reason for each verdict.

Stop one agent or all of them. Pausing takes effect before the next proposal, and nothing queued is executed while paused.

Planned

Execution

ProposeAgent submits an intent

CheckPolicies run

SettleSigned and sent

It works at the transaction level for any agent framework, rather than being another agent wallet. It returns machine-readable reasons so the agent can adjust and retry, not just fail.

How it works

4 steps from start to first result.

Connect an accountOwners keep the keys.

Set policiesLimits, programs, approval thresholds.

Give agents scoped accessRevocable at any time.

Review the logEvery action is recorded.

Under the hood

Open by default.

Every screen reads from the same model. Live parts read public onchain data; nothing ever asks your wallet to sign.

Read the docs

preflight.json

{
  "product": "Preflight",
  "network": "solana",
  "features": [
    {
      "name": "MCP server exposing a check_transaction tool tha",
      "status": "planned"
    },
    {
      "name": "Token checks: mint and freeze authority, top hol",
      "status": "planned"
    },
    {
      "name": "Rules file in plain YAML (max size per trade, al",
      "status": "planned"
    },
    {
      "name": "Public verdict log with shareable permalinks so ",
      "status": "planned"
    }
  ]
}

What works today.

Live features work today. Planned ones are next on the roadmap, in this order.

MCP server exposing a check_transaction tool that simulates a transaction and returns balance changes, programs touched.Planned

Token checks: mint and freeze authority, top holder concentration, liquidity depth and slippage versus the requested.Planned

Rules file in plain YAML (max size per trade, allowed programs, blocked tokens) with the reason for each verdict.Planned

Public verdict log with shareable permalinks so a builder can show why a trade was blockedPlanned

Web playground where anyone can paste a transaction and see the decoded resultPlanned

Questions.

Short answers. The docs have the rest.

What is Preflight?

An MCP server that simulates and risk-checks every transaction an AI agent wants to sign, before it signs. It works at the transaction level for any agent framework, rather than being another agent wallet. It returns machine-readable reasons so the agent can adjust and retry, not just fail.

What works today?

Preflight is in development. Every feature is on the status list with what ships next, and the app opens in a sample workspace so you can see how it will work.

Do I need a wallet?

No. You can explore without one. Connecting a Solana wallet only shares your public address so Preflight can read your balances; it never asks you to sign a transaction.

Who is it for?

Builders of Solana trading and portfolio agents, funds running automated strategies, and power users who let agents prepare transactions for them.

MCP server exposing a check_transaction tool that simulates a transaction and returns balance changes, programs touched.

An MCP server that simulates and risk-checks every transaction an AI agent wants to sign, before it signs.

Launch app Read the docs