diff --git a/readme.md b/readme.md
index 0a30453..b6cabf0 100644
--- a/readme.md
+++ b/readme.md
@@ -176,6 +176,7 @@ Decentralized finance (#defi) is the movement that leverages open source softwar
   - [AZTEC Protocol](https://www.aztecprotocol.com) ([source code](https://github.com/AztecProtocol/AZTEC), [white paper](https://github.com/AztecProtocol/AZTEC/blob/master/AZTEC.pdf)) - Privacy-enabling protocol for confidential transactions on the Ethereum network
   - [Centrifuge](https://www.centrifuge.io) ([source code](https://github.com/centrifuge), [white paper](https://centrifuge.io/centrifuge_os_white_paper.pdf)) - Platform for financial supply chain, including exchange of invoices, purchase orders, etc.
   - [Groundhog](https://groundhog.network) - "End-to-end" platform for decentralized recurring subscription payments
+  - [x402](https://github.com/xpaysh/awesome-x402) - Internet-native payment protocol using HTTP 402 status code for blockchain payments
 
 <a name="community" />