docs: Add 0.5% gateway commission details to all SDK documentation

Add transparent pricing information to main README and both SDK READMEs:
- Gateway commission: 0.5% on all payments
- Two-transaction model (merchant + commission)
- Commission covers infrastructure costs
- Both transactions atomic and on-chain

This improves transparency and helps developers understand costs before integration.

No code changes - documentation only.

Author: Your Name

README.md

@@ -38,6 +38,12 @@ AgentGatePay enables AI agents to make and accept cryptocurrency payments with m
 - 📊 Real-time analytics and webhooks
 - ⚡ Sub-5 second payment verification
 
+**Gateway Commission:** 0.5% fee on all payments
+- Automatically deducted via two-transaction model
+- Commission TX: 0.5% → AgentGatePay wallet (covers infrastructure costs)
+- Merchant TX: 99.5% → seller wallet
+- Both transactions atomic and transparent on-chain
+
 ## SDKs
 
 ### JavaScript/TypeScript SDK

javascript/README.md

@@ -17,6 +17,12 @@ Official JavaScript/TypeScript SDK for [AgentGatePay](https://agentgatepay.io) -
 - **Analytics** - Built-in revenue and spending tracking
 - **Zero dependencies** (except axios) - Lightweight and fast
 
+**Gateway Commission:** 0.5% fee on all payments
+- Automatically deducted via two-transaction model
+- Commission TX: 0.5% → AgentGatePay wallet (covers infrastructure costs)
+- Merchant TX: 99.5% → seller wallet
+- Both transactions atomic and transparent on-chain
+
 ## Installation
 
 ```bash

python/README.md

@@ -15,6 +15,12 @@ Official Python SDK for [AgentGatePay](https://agentgatepay.io) - Secure multi-c
 - **Webhooks** - Real-time payment notifications with HMAC verification
 - **Analytics** - Built-in revenue and spending tracking
 
+**Gateway Commission:** 0.5% fee on all payments
+- Automatically deducted via two-transaction model
+- Commission TX: 0.5% → AgentGatePay wallet (covers infrastructure costs)
+- Merchant TX: 99.5% → seller wallet
+- Both transactions atomic and transparent on-chain
+
 ## Installation
 
 ```bash