We just launched a public x402 Playground at relai.fi/playground.
The goal is simple: help developers validate paid API flows fast, without going through full dashboard setup every time.
The problem we wanted to solve
Before this, quick testing still had friction:
- You often had to enter authenticated dashboard flow just to run a payment test
- Sharing reproducible test setups across team members was slower than it should be
- Debugging wallet-specific issues (signing, network mismatch, token selection) took too many steps
For teams building paid APIs, this slowed down the shortest and most important loop:
change config → test payment → inspect result → fix → retest
What this solves in practice
1) Faster first success
New users can run a realistic payment test immediately, instead of doing account + dashboard navigation first.2) Better debugging workflow
You can quickly isolate issues in signing and settlement flow, verify network/token combinations, and iterate faster.3) Easier collaboration
A public route makes it easier for product, support, and engineering to reproduce the same payment scenario.Why this matters now
As payment support expands across chains and tokens, integration complexity naturally grows. A dedicated playground keeps that complexity manageable by giving developers one place to:- validate payment behavior
- compare transport and signing paths
- confirm expected UX before shipping to end users
Available now
Open the playground and run your own test flow:https://relai.fi/playground
Build faster, debug earlier, and ship paid API flows with confidence.
