Quick Start: Send Your First Protected Transaction

Prflght protects your AI agent’s transactions through a four-stage pipeline: simulation, policy evaluation, protocol health check, and on-chain attestation. This guide walks you through every step — from creating your account to sending your first protected transaction.

Connect your wallet

Go to app.prflght.xyz and connect your Solana wallet. Prflght supports Phantom and Solflare. Once connected, sign the authentication message in your wallet. No password is required — your signature proves ownership of the wallet.

Copy your API key

After authenticating, open the API Keys section of the dashboard and copy your API key. Keep this value secure — it authorizes all firewall checks made on behalf of your agent.

Set your agent policy

Open the Policy editor on the dashboard and configure the rules for your agent:

Max notional — the maximum USD value of a single transaction
Allowed programs — a list of Solana program IDs your agent may interact with
Slippage limit — the maximum acceptable slippage percentage
Daily transfer limit — the cumulative USD value allowed per day

Save the policy. Prflght applies it to every transaction your agent submits.

Install the SDK

Add @prflght/sdk to your project:

npm install @prflght/sdk

bun add @prflght/sdk

Initialize the Firewall client

Import Firewall and construct a client with your API URL and agent ID. The agentId is your agent’s wallet public key as a base58 string.

import { Firewall, FirewallDenyError } from '@prflght/sdk'

const firewall = new Firewall({
  apiUrl: process.env.PRFLGHT_API_URL,   // https://api.prflght.xyz
  agentId: agentKeypair.publicKey.toString(),
})

Check your transaction

Before you send a transaction, pass its base64-encoded bytes to firewall.check(). Prflght simulates the transaction, evaluates it against your policy, and checks protocol health.

const result = await firewall.check(txBase64)

If the transaction passes all checks, result.instructions contains the attestation instructions you must prepend to your transaction.

You must prepend result.instructions to your transaction’s instruction list. The on-chain program rejects any transaction that does not include a valid attestation.

Prepend attestation instructions and send

Build the final transaction with the attestation instructions first, then your own instructions, and submit it.

import { Firewall, FirewallDenyError } from '@prflght/sdk'

const firewall = new Firewall({
  apiUrl: process.env.PRFLGHT_API_URL,
  agentId: agentKeypair.publicKey.toString(),
})

try {
  const result = await firewall.check(txBase64)
  // Prepend attestation instructions before your own
  const finalTx = buildTxWithIxs([...result.instructions, ...yourIxs])
  await sendAndConfirm(finalTx)
} catch (err) {
  if (err instanceof FirewallDenyError) {
    console.error('Blocked:', err.reason) // e.g. "notional exceeds policy limit"
  }
}

FirewallDenyError is thrown when Prflght blocks the transaction. The err.reason field explains which check failed — use it to adjust your policy or debug your agent’s behavior.

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Quick Start: Send Your First Protected Transaction