Affiliate program
Send us textbook sellers, earn 10% of everything we pay them. Built for price-comparison sites, campus blogs, and student groups.
10%
Commissionof every completed buyback you refer, on the amount paid to the seller. Higher tiers by volume.30 days
AttributionA seller who clicks your link is yours for 30 days, even if they come back later.Monthly
PaymentBy PayPal or ACH by the 10th for the previous month, with a per-referral statement.Your link
Add your affiliate ID and, if you have it, the book's ISBN. The ISBN lands the seller with that book already in their cart and the offer showing:
https://billsforbooks.com/?isbn={ISBN}&ref={YOUR_ID}&clickid={OPTIONAL_CLICK_ID}#sell
Any placeholder format works ({ISBN}, %ISBN%, [ISBN]). Without an ISBN the link opens the sell page ready for them to scan or type. The clickid is passed back on your statement so you can reconcile to your own tracking.
Price API
Pull our live offer for any ISBN. Cached at the edge; comfortable at 25,000 requests an hour.
GET https://billsforbooks.com/api/vendor-price?isbn=9780134093413
{"isbn":"9780134093413","title":"Campbell Biology","price":37.00,"currency":"USD",
"buying":true,"url":"https://billsforbooks.com/?isbn=9780134093413&utm_source=bookscouter#sell",
"expires":"2026-09-22T14:00:00Z"}
Up to 50 ISBNs per call, comma-separated, returns a prices array. buying:false and price:0 means we're not taking that title today. No key required.
What sellers get from us
| Offer | Instant, per ISBN, priced against the live market. Good for 10 days. |
|---|---|
| Shipping | Free prepaid USPS label. No minimum order. |
| Payment | PayPal, direct deposit, or check within 5 business days of the books arriving. |
| Condition | Standard student editions in readable condition. Details at /condition. |
| Mobile | Full experience on phones, including barcode scanning with the camera. |
Join
Tell us who you are and where the traffic comes from, and we'll set up your ID and statement access within one business day.