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Pre-sign transaction intelligence · Base

Small bites. Big savings.

Transaction intelligence before you sign.

Nibbl watches fees, approvals, routing, slippage, and failed execution risk before value leaks from your wallet.

Check TransactionRead Docs
mode: pre-signnetwork: Baselatency: local estimatestatus: simulated
nibbl · pre-sign
Transaction Previewsimulated
Route Checkready
Approval Exposurereview needed
Slippage Windowwide
Fee Deltaelevated
Execution Riskmedium

Suggested action

Review approval scope before signing. Slippage window is wider than usual for this route.

Nibbl checks the tiny leaks most wallets ignore.

Fees

Detects unusual fee spikes, failed route patterns, and unnecessary execution waste.

Approvals

Flags broad permissions, repeated approvals, and contracts that ask for more than they need.

Routes

Compares expected output, slippage tolerance, and execution path before a transaction is signed.

Before the wallet opens, Nibbl runs the pass.

01

Prepare

User creates or receives a transaction.

02

Simulate

Nibbl checks the route, approval, expected output, and fee behavior.

03

Explain

The agent shows a simple risk summary and what changed.

04

Sign or skip

The user decides with more context.

Six quiet checks. One small agent.

01

Fee Drift

Detects when a transaction costs more than expected compared with recent local conditions.

02

Approval Scope

Checks whether a contract is asking for broad, repeated, or unnecessary wallet permissions.

03

Route Friction

Reviews routing complexity, expected output, and possible execution failure.

04

Slippage Guard

Surfaces unsafe slippage windows and suspicious output changes before signing.

05

Failed TX Memory

Learns from repeated failed patterns and warns when a similar route appears again.

06

Wallet Leak Watch

Tracks small recurring value leaks across approvals, swaps, failed attempts, and repeated interactions.

Read the pass, line by line.

Every check returns a plain summary. No noise, no blocking — just context before you sign.

> nibbl inspect --mode pre-sign
network: Base
route: simulated
approval: review needed
fee delta: elevated
slippage window: wide
execution risk: medium
 
finding:
This transaction is not blocked.
Nibbl found a wider-than-usual slippage window and a new approval request.
 
suggestion:
Review approval scope before signing.
>

One panel for the moment that matters.

Demo interface — values shown are illustrative product placeholders.

Current transactionreview needed
Type
Swap
Network
Base
Hops
3
Est. fee
elevated
Fee behavior (local estimate)
Approval details
  • scopeunlimited
  • router0x9f...2ac1
  • suggestedbounded
Risk summary
Medium

Wide slippage and a broad approval. Not blocked.

Recent checks
  • swap route reviewed
  • approval scope changed
  • fee estimate moved
  • slippage window tightened
  • failed route avoided

Watch the small stuff before it becomes expensive.

Add wallets, contracts, and frequent routes to a watchlist Nibbl keeps an eye on for you.

Wallet Watch

Track wallets you interact with often.

Approval Watch

Surface permission changes as they happen.

Route Watch

Follow frequent routes for output drift.

Contract Watch

Flag contracts that change behavior.

Watchlist mode runs quietly in the background and surfaces changes only when something matters.

status: watching

$NIBBL powers the deeper checks.

Nibbl is the product. $NIBBL unlocks higher-frequency checks, longer watchlists, API access, alert routing, and advanced transaction reports.

Contract Address
0x68365dc66E17AF66bB782Beebe85E7f61257bb07
Buy on DEXDexScreenerBaseScan

Free

  • Basic pre-sign check
  • Simple fee and approval summary
  • Public route preview

Nibbl

  • Faster check queue
  • Saved wallet watchlist
  • Approval history

Nibbl Pro

popular
  • Advanced route analysis
  • Failed transaction memory
  • Alert routing

Nibbl Pack

  • Team watchlists
  • API access
  • Webhook alerts
  • Extended reports

Plug Nibbl into the moment before signing.

npm install nibbl-agent
Demo telemetry · interface data
0
checks in current session
0
routes reviewed
0
approvals surfaced
0
alerts muted
0
reports generated

Let Nibbl check the crumbs.

Fees, approvals, routes, and slippage rarely break a wallet all at once. Nibbl watches the small leaks before they add up.

Check TransactionRead DocsJoin X