No unified virtual try-on API is best for everyone. A gateway gives you one key, one bill and the freedom to swap models, at the cost of an extra routing hop or a less specialized catalog. Of the six gateways compared here, fal.ai lists the most try-on endpoints (10 in its own July 2, 2026 guide), while TryOn API is the only one built specifically to route try-on and related image models through one OpenAI-compatible endpoint.

A unified virtual try-on API matters because the model market keeps changing. Dedicated models such as FASHN, Kling Kolors and Black Forest Labs’ FLUX Virtual Try-On sit alongside general image models like Gemini and gpt-image-1 that can also dress a person in a garment. Each has its own price, latency and failure modes. A gateway lets you test them on your own catalog photos without building six integrations.

What “unified” actually means

The six products use the word differently. TryOn API and OpenRouter present one request format (OpenAI-style) across providers. fal.ai, Runware and Segmind give you one account and one billing balance, but each model keeps its own input schema, so swapping models usually means adapting code. Replicate sits at the generic end: one API, community models, licences you check yourself. If your goal is a benchmark harness where model is a parameter, request format matters more than catalog size.

Catalog size versus catalog fit

On October 24, 2026, fal’s guide counted 10 try-on endpoints, TryOn API’s models page showed eight entries (several in beta), Runware showed one dedicated try-on model, and OpenRouter’s image docs named none. Counting is not the same as fit. TryOn API lists general image models next to dedicated try-on models, which helps a store compare “purpose-built” with “prompted” output on its own images. fal’s catalog is larger but includes research-only and realtime-video models that are not drop-in storefront options.

Prices you can check, and prices you cannot

fal and Runware publish numbers: $0.075 for FASHN v1.5 per generation on fal, and per-megapixel pricing for FLUX Virtual Try-On on both fal and Runware ($0.0375 for the first input megapixel, plus $0.005 per extra input megapixel and per output megapixel). Segmind bills by GPU second, so cost per image depends on runtime. TryOn API shows credits per request (1 to 2 on the models page) but no pack prices on the pages I could open. For direct comparison, FASHN’s own on-demand rate is $0.075 per credit with a $7.50 minimum purchase and no API free tier, so a gateway offering the same model at the same price adds convenience with no obvious markup.

Where this is heading

Two signals suggest gateways will keep gaining ground. First, model releases are frequent: FLUX Virtual Try-On was released on Runware on May 28, 2026, and individual endpoints get retired, as the fal Kling Kolors v1.5 page’s deprecation note shows. Second, general gateways such as OpenRouter are adding image-to-image endpoints, which will pressure try-on-specific services to compete on fidelity, fallbacks and clear pricing, not access alone.

Who should pick what

Choose TryOn API if you want to benchmark and swap dedicated and generative try-on models through an OpenAI-compatible call. Choose fal.ai if you want the widest catalog and public per-generation prices and are comfortable adapting to each model’s schema. Choose Runware if FLUX Virtual Try-On is your model. Choose Segmind for its own SegFit line or dedicated capacity. Use OpenRouter or Replicate for prototyping, and read each model’s licence before shipping.