PromptLayer review

PromptLayer sells subscription plans and adds pay-as-you-go overage on individual transactions, so usage past the plan allowance keeps adding cost per transaction. With 10 providers routed, a mixed provider workload stays behind a single gateway and a single overage line.

Yes, a free tier is available, so traffic can run through the gateway before you pay for a plan. It sits next to the subscription model: you start free, then move to a subscription with per-transaction overage. With 10 providers routed, the free tier is a cheap way to see which provider your stack needs.

Yes, bring your own key is supported, so the providers you already pay for keep billing you directly while the gateway adds routing and control on top. Support runs on email, phone and help centre, so questions can go to email or phone as well as the help centre and community.

The OpenAI-compatible API is supported, so most client code can point at PromptLayer using the request shape it already sends. That is the main reason to route 10 providers through a single endpoint instead of maintaining a separate integration for each model vendor.

PromptLayer routes 10 providers, which sits close to the 9 across gateways in this comparison. That covers a stack using several major vendors, and it is a limit for teams wanting broad long-tail provider coverage in one place.

Support runs on email, phone and help centre, covering email, phone, a help centre and a community. Live chat is not in that list, so time-sensitive questions tend to go through email or phone. What each plan carries differs, so check the plan before you rely on a given channel.

The headquarters country is US, which is the anchor for contract and data protection questions. Support runs on email, phone and help centre, so a team outside the US still has email, phone, help centre and community routes, and the fee model stays subscription plus per-transaction overage.