Who makes API? Amazon sales, products and sellers
Updated November 2026 with September 2026 data
At a glance
- Size
- Large
- $2.1M est./mo
- Trend
- Declining
- -22%, last 2 vs prior 2 months
- Ratings
- Strong
- 4.6 ★ · 404,717 reviews
- Who sells it
- Mostly one seller
- Top seller has 97% of units
API estimated monthly revenue on Amazon
Our read on API
API ranks 2 of 92 brands in Aquarium Water Treatments, within Pet Supplies, with an estimated 25% of the category's revenue. Estimated revenue was $2.1M in September 2026, down from $2.9M in June 2026, a change of -28% across 4 months of data. Over the last 2 months the trend is labeled declining at -22%. Estimated units in the latest month were 129,000 across 158 products. The top product is API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle at 11,000 units per month and a 4.7 rating. The average rating is 4.6 across 404,717 reviews. Sales are concentrated, with Amazon accounting for 97% of units among 21 sellers.
Top API products on Amazon
As an Amazon Associate we earn from qualifying purchases. Links to Amazon below are affiliate links.
| Product | Rating | Est. units/mo | Amazon link |
|---|---|---|---|
| API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle | 4.7 ★27,043 reviews | 11,000 | Check price on Amazon |
| API Stress Coat Aquarium Water Conditioner 16-Ounce Bottle | 4.8 ★38,778 reviews | 7,000 | Check price on Amazon |
| API Freshwater Master Test Kit 800-Test Freshwater Aquarium Water Kit | 4.8 ★31,477 reviews | 6,200 | Check price on Amazon |
| API ACCU-CLEAR Freshwater Aquarium Water Clarifier 8-Ounce Bottle | 4.6 ★20,360 reviews | 5,400 | Check price on Amazon |
| API TURTLE SLUDGE DESTROYER Aquarium Cleaner and Sludge Remover | 4.6 ★6,591 reviews | 4,600 | Check price on Amazon |
| API POND ALGAEFIX | 4.3 ★21,303 reviews | 3,400 | Check price on Amazon |
| API Quick Start Freshwater & Saltwater Aquarium Nitrifying Bacteria | 4.7 ★15,469 reviews | 3,300 | Check price on Amazon |
| API GH & KH TEST KIT Freshwater Aquarium Water Test Kit | 4.7 ★5,972 reviews | 2,800 | Check price on Amazon |
| API TURTLE WATER CONDITIONER Water Conditioner 8-Ounce Bottle | 4.8 ★3,273 reviews | 2,600 | Check price on Amazon |
| API Betta Water Conditioner Betta Fish Freshwater Aquarium Water | 4.7 ★3,557 reviews | 2,500 | Check price on Amazon |
Who sells API
- Amazon97%
- pondsupply1%
- Kwik Retail<1%
- Asavvysavers<1%
- Monster Pets<1%
Share of estimated units sold in September 2026, by the seller holding the Buy Box.
Place in its category
#2 of 92
Rank 2 of 92 brands in Aquarium Water Treatments by estimated revenue in September 2026, with 25% of the category.
Frequently asked questions
Who makes API?
API is the brand name on 158 products we tracked on Amazon in September 2026 mostly in Aquarium Water Treatments (Pet Supplies). The largest seller of API products that month was Amazon, with 97% of estimated units. Amazon listings don't show the brand owner's legal name, so the brand's own website is the place to confirm its parent company.
How much does API sell on Amazon?
API sold an estimated $2.1M on Amazon in September 2026, about 129,000 units. That is -28% compared with June 2026. These are Ecominsights estimates, not figures reported by the brand.
What are API's best-selling products on Amazon?
By estimated units sold in September 2026: 1. API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle (about 11,000 units); 2. API Stress Coat Aquarium Water Conditioner 16-Ounce Bottle (about 7,000 units); 3. API Freshwater Master Test Kit 800-Test Freshwater Aquarium Water Kit (about 6,200 units).