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AI agents can misread store policies when they shop for you.

They stitch return options into one the store never offered. It’s called route mixing.

1 · What the buyer needs

“Buy the boots, but only if the return is free, I’m refunded to my card and I have 30 days from delivery.”

2 · The store’s three return options

Prepaid labelFee$8RefundYour cardWindow from delivery30 days
Drop-off pointFeeFreeRefundStore creditWindow from delivery30 days
In storeFeeNot statedRefundYour cardWindow from delivery14 days

The buyer lives near a store, so all three are open to them.

3 · Ask two agents

Same question, same store. Ask a typical agent and an agent using Blink.

Illustrative. store.example isn’t a real store.

How it works.

  1. 01

    Your agent asks.

    The product and the buyer’s conditions, before it buys.

    blink.decisions.create({ productUrl, conditions })

  2. 02

    Blink reads the policy.

    Every route apart. Every fact sourced.

    3 routes · 1 unknown · policy 2026-10-12

  3. 03

    The purchase gets a receipt.

    ALLOW, DENY or REVIEW, signed. A REVIEW comes back to you to sign off.

    ALLOW · ed25519:7Hq…

Start free. Pay per decision.

Pricing

Where you can use Blink.

  • One API call. ALLOW, DENY or REVIEW, with sources.

    Explore the API
    decide.ts
    const res = await fetch("https://api.thankyoublink.com/v1/decisions", {
      method: "POST",
      headers: { Authorization: `Bearer ${BLINK_KEY}` },
      body: JSON.stringify({
        product_url,
        conditions: {
          return_window_days: 30,
          return_fee: "none",
          refund_to: "original_payment",
        },
      }),
    })
    
    // { decision: "DENY", routes: [...], unknown: [] }

Every purchase gets a receipt.

Checked before the agent pays, signed so anyone can verify. Read the receipt spec

store.example/checkout

Leather boots

Size 42 · Ochre

$240.00

Shipping
Free
Total
$240.00

Terms checked ✓

Returnable for 30 days by mail with an $8 label, refunded to your card. Signed receipt attached.

Pay $240.00

Illustrative checkout. The receipt format is a published draft.

Every store. Every policy.

A

  • amazon
  • apple
  • adidas
  • asos
  • aliexpress
  • abercrombie
  • anthropologie
  • allbirds
  • ae
  • athleta
  • aritzia
  • aesop
  • arket
  • acnestudios
  • awaytravel
  • aloyoga
  • article
  • aldoshoes
  • ashleyfurniture
  • autozone
  • argos.co.uk

B

  • bestbuy
  • bathandbodyworks
  • bloomingdales
  • burberry
  • brooklinen
  • bombas
  • boohoo
  • bhphotovideo
  • barnesandnoble
  • birkenstock
  • bose
  • brooksrunning
  • bananarepublic
  • backcountry
  • bonobos
  • bottegaveneta
  • boots

C

  • costco
  • chewy
  • crateandbarrel
  • coach
  • converse
  • crocs
  • columbia
  • cos
  • casper
  • chanel
  • cb2
  • clarks
  • cvs
  • carhartt
  • canadagoose
  • charlottetilbury
  • cotopaxi
  • cuyana

D

  • dell
  • dyson
  • dickssportinggoods
  • depop
  • dior
  • dsw
  • drmartens
  • diesel
  • decathlon
  • dillards
  • deciem
  • dagnedover
  • darntough
  • dunelm

E

  • etsy
  • ebay
  • everlane
  • express
  • endclothing
  • ecco
  • eddiebauer
  • elfcosmetics
  • eileenfisher
  • eloquii
  • ethanallen

F

  • farfetch
  • footlocker
  • fashionnova
  • freepeople
  • fanatics
  • fabletics
  • fossil
  • fendi
  • finishline
  • fentybeauty
  • fjallraven
  • forever21
  • fromourplace
  • frame-store
  • food52

G

  • gap
  • gymshark
  • glossier
  • goat
  • gucci
  • gamestop
  • guess
  • grailed
  • ganni
  • gorjana
  • girlfriend
  • goodamerican
  • guitarcenter
  • gilt

H

  • hm
  • homedepot
  • hermes
  • hoka
  • hollisterco
  • harrods
  • huckberry
  • hydroflask
  • herschel
  • hunterboots
  • hims
  • harrys

I

  • ikea
  • iherb
  • instacart
  • isabelmarant
  • indochino
  • iliabeauty
  • intermixonline
  • italic
  • ipsy

J

  • jcrew
  • jcpenney
  • jdsports
  • jomalone
  • jimmychoo
  • johnlewis
  • jacquemus
  • jennikayne
  • journeys

K

  • kohls
  • kith
  • katespade
  • kiehls
  • kyliecosmetics
  • keenfootwear
  • kroger
  • kotn
  • kirklands
  • kenzo
  • karllagerfeld

L

  • lululemon
  • lowes
  • levi
  • lego
  • louisvuitton
  • llbean
  • lacoste
  • loewe
  • lush
  • lulus
  • loft
  • landsend
  • lovesac
  • lenovo
  • lyst
  • lovevery

M

  • macys
  • madewell
  • mango
  • mejuri
  • michaelkors
  • marksandspencer
  • moncler
  • mytheresa
  • muji
  • michaels
  • merrell
  • montblanc
  • mvmt
  • modcloth
  • mackage
  • marimekko
  • monos
  • materialkitchen

N

  • nike
  • nordstrom
  • newbalance
  • net-a-porter
  • newegg
  • nastygal
  • nespresso
  • ninjakitchen
  • nyxcosmetics
  • nobullproject
  • nixon
  • nuuly
  • nudiejeans
  • nanushka

O

  • oldnavy
  • on
  • overstock
  • officedepot
  • ouraring
  • oakley
  • onepeloton
  • olaplex
  • outdoorvoices
  • orvis
  • oscardelarenta

P

  • patagonia
  • prada
  • puma
  • potterybarn
  • poshmark
  • petco
  • pandora.net
  • primark
  • pacsun
  • pullandbear
  • paige
  • parachutehome
  • purple
  • polene-paris

Q

  • qvc
  • quince
  • quiksilver
  • quayaustralia
  • qalo

R

  • rei
  • ralphlauren
  • revolve
  • ray-ban
  • reebok
  • rothys
  • rimowa
  • rag-bone
  • rhodeskin
  • ruggable
  • rebag
  • rugsusa
  • rollerrabbit

S

  • shein
  • sephora
  • samsclub
  • stockx
  • skims
  • ssense
  • saksfifthavenue
  • skechers
  • stanley1913
  • stussy
  • supreme
  • sezane
  • shopbop
  • stevemadden
  • staples
  • sonos
  • spanx
  • snowpeak
  • stories

T

  • target
  • temu
  • tjmaxx
  • thenorthface
  • tiffany
  • therealreal
  • thereformation
  • toryburch
  • tommy
  • timberland
  • toms
  • tumi
  • theory
  • thredup
  • tractorsupply
  • tedbaker
  • tentree

U

  • ulta
  • uniqlo
  • urbanoutfitters
  • ugg
  • underarmour
  • untuckit
  • urbandecay

V

  • vans
  • victoriassecret
  • vestiairecollective
  • versace
  • valentino
  • veja-store
  • vuoriclothing
  • vitamix
  • vince
  • verabradley
  • venus

W

  • walmart
  • wayfair
  • williams-sonoma
  • warbyparker
  • westelm
  • wish
  • wearfigs
  • woot
  • wrangler
  • weekday
  • whitefoxboutique
  • waterstones
  • wolfandbadger

X

  • xbox
  • xiaomi
  • xeroshoes
  • xtratuf

Y

  • yeti
  • ysl
  • yoox
  • yankeecandle
  • yesstyle
  • youngla
  • yogaoutlet

Z

  • zara
  • zappos
  • zalando
  • zimmermann
  • zennioptical
  • zulily
  • zumiez
  • zadig-et-voltaire
  • zaful

Questions.

What is Blink?

Blink reads the return, shipping and refund terms behind a product and turns them into answers people and AI agents can check. Every answer keeps the store’s own wording attached.

What is a Blink receipt?

A small signed record Blink attaches to every allowed purchase: the route that met your conditions, hashes of the purchase, the conditions and the evidence, and the policy version. Anyone can check the signature against Blink’s public key without calling Blink.

What is route mixing?

Stores often offer several ways to return an item, each with its own fee, deadline and refund type. Route mixing is when an agent takes “free” from one option and “refund to card” from another, then approves a return the store never offered. Blink checks each option on its own.

Where can I use Blink?

In ChatGPT, Gemini, Claude, Grok and any client that supports MCP, through the API in your own product, and in your browser with the Blink extension.

Does Blink buy anything for me?

No. Blink answers questions about a store’s terms and says whether a purchase meets your conditions. Your agent, or you, still decides and checks out.

What happens when a policy doesn’t say?

Blink marks it unknown. A missing fee is never read as a free return. When an unknown fact matters, the answer is REVIEW, with the missing fact named.

Where can I read the research?

The research page summarises our paper on evidence-bound policy authorization, including its limits.

Fine print. Finally read.

Get Blink