Agentic Payment Tools
Free tools for teams building agent payments. First up: an x402 endpoint checker that tests replay, caching and settlement handling. Join the waitlist.
x402 Endpoint Checker (Coming Soon)
A free tool that tests a live x402 endpoint the way an attacker would, and tells you in plain language what to fix. It is based on the attack classes in our agentic payment security guide:
- Replay: does one payment unlock the resource more than once?
- Caching: do paid responses carry headers that let a CDN cache them?
- Settlement order: is the resource released before settlement is confirmed?
- Spec version: are you still on v1
X-PAYMENTheaders? - 402 response quality: are price, asset, network and payee complete and valid?
It only runs against endpoints you control and uses testnets by default.
Need answers sooner? Book an agentic payment security audit.
Last updated October 9, 2026
Get early access to the x402 Endpoint Checker
Leave your email and the endpoint you want checked. We will send you access as soon as it is ready.
Frequently Asked Questions
What will the x402 Endpoint Checker test?
It will send real x402 requests to an endpoint you control and check for the common implementation bugs: replayed payments being accepted, paid responses being cacheable, resources released before settlement, outdated v1 headers and missing payment details in the 402 response.
Will it be free?
Yes. The checker will be free to use on your own endpoints. If it finds something serious, we offer a full security audit, but you do not need one to use the tool.
Get Started for Free
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Every engagement is scoped by our principal architect, Adrian Vale: 20+ years in production engineering, 40+ professional certifications. Meet Adrian
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