402signalhq/402signal

Overview

Pre-flight check for agent payments using x402 and MPP. It verifies that the payment endpoint is live and that the price and recipient match expectations before an agent authorizes payment. It produces signed evidence of the check.

Best for

Best for
Developers building agents that pay via x402 or MPP and need pre-payment verification.

Use cases

• Verify endpoint liveness before agent payment
• Confirm price and recipient match before paying
• Generate signed evidence for payment audits

How to use

Install

npm install @402signal/route-guard@0.7.6 && npm audit signatures

Notes

Pre-flight check for agent payments using x402 and MPP. It verifies that the payment endpoint is live and that the price and recipient match expectations before an agent authorizes payment. It produces signed evidence of the check.

1 stars on GitHub. Last updated 2026-09-15. Licensed MIT.

Use cases

• Verify endpoint liveness before agent payment
• Confirm price and recipient match before paying
• Generate signed evidence for payment audits

Pros

• Focused on a specific payment pre-flight need
• Open source and simple to inspect
• Provides signed evidence for accountability

Cons

• Very early stage with minimal adoption (1 star)
• Python only, no other language bindings
• Limited documentation or community support

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.