n8n · Agent Guardrails

Add Runtime Guardrails to an n8n Workflow

Stop risky agent actions before they execute.

Redlynr adds a pre-action runtime decision to an n8n workflow. Send the proposed action to Redlynr before execution and route the workflow based on one of three responses:

proceed · slow_down · stop

Two workflows available — start free or pay per call from your own wallet.

Choose a workflow

Trial Workflow or Paid x402 Workflow

Both workflows route Redlynr decisions through proceed, slow_down, and stop. Choose based on whether you want to try Redlynr free or run it in production with per-call payments.

30-call free trial

Trial Workflow

Try Redlynr in n8n without configuring an x402 wallet. Import the Trial Workflow, add your Redlynr trial token, and route agent actions through proceed, slow_down, or stop.

30 free Redlynr calls No wallet required

Download Trial Workflow Trial Setup Instructions

The Trial Workflow does not automatically switch to paid x402 calls after the 30 free calls are used.

$0.001 per call · x402 USDC

Paid x402 Workflow

Run Redlynr from self-hosted n8n using your own USDC wallet on Base. The workflow handles the x402 payment flow and routes Redlynr decisions through proceed, slow_down, or stop.

$0.001/call USDC on Base Self-hosted n8n

Download Paid x402 Workflow Paid Setup Instructions

⚠ Self-hosted n8n only. Requires the external ethers npm module. Not compatible with n8n Cloud.

How it works

Both workflows place Redlynr directly in front of the action you want to protect:

Prepare / Configure → Redlynr Guardrail → Decision Router

proceed

Execute the protected action

slow_down

Route for slowdown handling

stop

Block the protected action

Both workflows are intentionally simple so you can replace the example protected action with an API call, AI-agent step, database operation, notification, external tool, or any other n8n action.

Trial Workflow

Redlynr Guarded Action — Trial

The Trial Workflow uses a standard HTTP Request node to call Redlynr — no external npm modules required. Works on both self-hosted n8n and n8n Cloud.

The downloadable workflow includes:

Prepare Action node with all Redlynr request fields
POST request to https://redlynr.com/run
X-Trial-Token header placeholder
Routing for proceed → Protected Action
Routing for slow_down → Slow Down handler
Routing for stop → Action Blocked handler

Configuration fields (in the Prepare Action node):

tenant_id — replace YOUR_TENANT_ID with your namespace
agent_id, chain_id, chain_type, depth, step_cost

Your trial token goes in the Redlynr Guardrail node — find the X-Trial-Token header and replace YOUR_TRIAL_TOKEN.

No Redlynr credentials or account information are included in the download.

Download Trial Workflow Trial Setup Instructions (README)

Get a free trial token →

Paid x402 Workflow

Redlynr x402 Paid Workflow

⚠ Self-hosted n8n only. The Paid x402 Workflow requires the external ethers npm module and does not run on n8n Cloud.

Pay $0.001 per Redlynr call directly from your own USDC wallet on Base mainnet. No Redlynr account required — payment is signed locally by your wallet on each call. Redlynr never receives or stores your private key.

The downloadable workflow includes:

Customer Configuration node for wallet and agent settings
Call Redlynr node with full x402 payment signing
Automatic tenant registration on first run
Routing for proceed → PROCEED — Continue Agent
Routing for slow_down → SLOW_DOWN — Wait and Retry
Routing for stop → STOP — Halt Agent

Requirements summary (full instructions in the README):

Self-hosted n8n via Docker
ethers npm module installed in container
USDC on Base mainnet in your wallet
Wallet private key entered in Customer Configuration node after import

Your wallet signs each $0.001 payment locally. Redlynr never receives or stores your private key. Never share or export this workflow after filling in your key.

Download Paid x402 Workflow Paid Setup Instructions (README)

Why before the action?

Why put the guardrail before the action?

Agent and automation failures become expensive when the system acts first and evaluates later.

Redlynr sits before execution and evaluates runtime conditions such as cost pressure, chain depth, steps and retries, repetition, tool fixation, and request volume.

The workflow gets a structured decision before the protected action runs.

Should this action continue?

That is the question Redlynr is designed to answer.

Integration

Built for orchestration, not just n8n

The n8n workflows are implementation examples, not separate Redlynr products.

Redlynr is a REST API and can sit in front of actions executed by:

n8n agent frameworks custom orchestrators API workflows background jobs internal automation

If your system can make an HTTP request before taking an action, it can use Redlynr.

Put a guardrail in front of your next action.

Start with the Trial Workflow for 30 free calls, or use the Paid x402 Workflow for production use at $0.001 per call.

Download Trial Workflow Download Paid x402 Workflow Try 30 Calls Free