# Blockchain Migration - Implementation Summary

## Overview
This PR successfully migrates the AxiomTradeClient from broken Axiom API endpoints to direct blockchain operations, fixing the 404 errors reported in issue #XX.

## Problem Statement
Users were experiencing 404 errors when calling:
- `client.buy_token()` - Buy transaction method
- `client.sell_token()` - Sell transaction method  
- `client.GetBalance()` - Balance check method
- `client.get_token_balance()` - Token balance method

Error example:
```
{'success': False, 'error': 'Failed to get buy transaction: 404 - <html><body><h1>File Not Found</h1><hr><i>uWebSockets/20 Server</i></body></html>'}
```

## Solution Implemented

### 1. Trading Operations Migration
**Before:** Used Axiom API endpoints (`/buy`, `/sell`, `/send-transaction`)  
**After:** Use PumpPortal API + Solana RPC

#### Implementation Details:
- Endpoint: `https://pumpportal.fun/api/trade-local`
- Transaction type: `VersionedTransaction`
- Signing: Local with user's keypair
- Submission: Direct to Solana RPC

#### New Parameters:
- `priority_fee` - Control transaction priority (default: 0.005 SOL)
- `pool` - Select DEX ("raydium", "pump", "auto", etc.)
- `rpc_url` - Use any Solana RPC endpoint

### 2. Balance Operations Migration
**Before:** Used Axiom API endpoints (`/sol-balance`, `/batched-sol-balance`, `/token-balance`)  
**After:** Use Solana RPC directly

#### Implementation Details:
- SOL Balance: `getBalance` RPC method
- Token Balance: `getTokenAccountsByOwner` RPC method
- Batched: Multiple individual RPC calls

#### New Parameters:
- `rpc_url` - Use any Solana RPC endpoint (default: mainnet-beta)

### 3. Code Cleanup
Removed methods that were specific to old Axiom API workflow:
- `_get_keypair_from_private_key()` - Now use `Keypair.from_base58_string()` directly
- `_sign_and_send_transaction()` - Now inline PumpPortal flow

## Files Changed

### Core Implementation
- **axiomtradeapi/_client.py** (251 lines changed)
  - Updated `buy_token()` method
  - Updated `sell_token()` method
  - Updated `GetBalance()` method
  - Updated `GetBatchedBalance()` method
  - Updated `get_token_balance()` method
  - Removed 2 helper methods

### Documentation
- **ENDPOINT_FIX_SUMMARY.md** (complete rewrite)
  - Migration guide
  - Technical details
  - Usage examples
  - Benefits documentation

### Examples
- **examples/blockchain_migration_example.py** (new file)
  - 5 comprehensive examples
  - Safety warnings
  - Devnet testing recommendations
  - Real-world usage patterns

### Tests
- **test_blockchain_migration.py** (new file)
  - 4 test functions
  - Method signature verification
  - Structure validation
  - Constants for maintainability

## Backward Compatibility

### ✅ Existing Code Works
```python
# This code continues to work without changes
balance = client.GetBalance(wallet_address)
result = client.buy_token(private_key, token_mint, 0.01, 5)
```

### ✅ New Features Available
```python
# Users can now leverage new parameters
balance = client.GetBalance(
    wallet_address, 
    rpc_url="https://mainnet.helius-rpc.com/"
)

result = client.buy_token(
    private_key, 
    token_mint, 
    0.01,
    slippage_percent=10,
    priority_fee=0.01,
    pool="raydium",
    rpc_url="https://api.devnet.solana.com"  # Test on devnet!
)
```

## Benefits

1. **No API Dependencies**
   - No reliance on Axiom API endpoints
   - Direct blockchain access
   - Works independently

2. **More Reliable**
   - Uses standard Solana RPC interface
   - Well-documented, stable protocols
   - Community-supported

3. **Flexible**
   - Choose your own RPC provider
   - Support for Helius, QuickNode, Triton, Alchemy
   - Easy to switch providers

4. **Backward Compatible**
   - Existing code continues to work
   - New parameters are optional
   - No breaking changes

5. **Future-proof**
   - Not affected by Axiom API changes
   - Based on blockchain standards
   - Long-term stability

## Testing & Validation

### Automated Tests
✅ Method signature verification  
✅ Import and initialization tests  
✅ Structure validation  
✅ Helper method removal confirmed

### Code Quality
✅ Python compilation successful  
✅ No import errors  
✅ All methods accessible  
✅ Type hints preserved

### Code Reviews
✅ Initial review addressed  
✅ Maintainability improvements added  
✅ Safety warnings enhanced  
✅ Documentation clarified

## Migration Impact

### What Changed
- Trading flow (now uses PumpPortal)
- Balance checking (now uses Solana RPC)
- Transaction signing (now local)

### What Stayed Same
- Authentication flow
- WebSocket subscriptions
- Method names and basic signatures
- Return value structures

### What Improved
- Reliability (no 404 errors)
- Flexibility (custom RPC)
- Control (priority fees, pool selection)
- Transparency (direct blockchain)

## Deployment Notes

### For Users
1. **No immediate action required** - existing code works
2. **Optional**: Update to use custom RPC endpoints
3. **Recommended**: Test on devnet before mainnet
4. **Benefit**: More reliable trading and balance checks

### For Maintainers
1. Axiom API endpoints no longer used for trading/balance
2. Authentication endpoints still use Axiom infrastructure
3. PumpPortal API is now a dependency for trading
4. Solana RPC is now required for all operations

## Future Enhancements

Potential improvements for future versions:
- [ ] Batch RPC calls for GetBatchedBalance (more efficient)
- [ ] Automatic RPC endpoint failover
- [ ] RPC endpoint health checking
- [ ] Transaction retry logic
- [ ] Gas optimization suggestions

## References

- **Issue**: #XX (Check balance & send transaction error)
- **PumpPortal API**: https://pumpportal.fun/local-trading-api/trading-api
- **Solana RPC**: https://docs.solana.com/api/http
- **VersionedTransaction**: https://docs.solana.com/developing/versioned-transactions

## Credits

- Maintainer guidance: @theshadow76
- Implementation: GitHub Copilot
- Testing: Automated test suite
- Documentation: Comprehensive guides and examples
