feat: gas estimator

Author: dlipicar

.golangci.yml

@@ -4,7 +4,7 @@ run:
   concurrency: 0
   timeout: 10m
   issues-exit-code: 1
-  tests: true
+  tests: false
 
 output:
   formats: 
@@ -32,6 +32,7 @@ linters:
     # You can't disable typecheck, see:
     # https://github.com/golangci/golangci-lint/blob/master/docs/src/docs/welcome/faq.mdx#why-do-you-have-typecheck-errors
     - unconvert
+    - bodyclose
   settings:
     errcheck:
       check-type-assertions: false
@@ -46,6 +47,9 @@ linters:
     goconst:
       min-len: 3
       min-occurrences: 2
+    gosec:
+      excludes:
+        - G115
 
 formatters:
   exclusions:

README.md

@@ -17,10 +17,42 @@ go get github.com/status-im/go-wallet-sdk
   - Smart fallback between different fetching methods
   - Chain-agnostic design
 
+- **`pkg/multicall`**: Efficient batching of contract calls using Multicall3
+  - Batch multiple contract calls into single transactions
+  - Support for ETH, ERC20, ERC721, and ERC1155 balance queries
+  - Automatic chunking and error handling
+  - Synchronous and asynchronous execution modes
+
 ### Ethereum Client
 - **`pkg/ethclient`**: Full-featured Ethereum client with go-ethereum compatibility
   - Complete RPC method coverage (eth_*, net_*, web3_*)
   - Go-ethereum ethclient compatible interface for easy migration
+  - Chain-agnostic methods for any EVM-compatible network
+
+### Gas Estimation
+- **`pkg/gas`**: Comprehensive gas fee estimation and suggestions
+  - Smart fee estimation for three priority levels (low, medium, high)
+  - Transaction inclusion time predictions
+  - Multi-chain support (L1, Arbitrum, Optimism, Linea)
+  - Network congestion analysis for L1 chains
+  - Chain-specific optimizations
+
+### Event Filtering & Parsing
+- **`pkg/eventfilter`**: Efficient event filtering for ERC20, ERC721, and ERC1155 transfers
+  - Minimizes eth_getLogs API calls
+  - Direction-based filtering (send, receive, both)
+  - Concurrent query processing
+
+- **`pkg/eventlog`**: Automatic event log detection and parsing
+  - Type-safe access to parsed event data
+  - Support for Transfer, Approval, and other standard events
+  - Works seamlessly with eventfilter
+
+### Smart Contract Bindings
+- **`pkg/contracts`**: Go bindings for smart contracts
+  - Multicall3 with 200+ chain deployments
+  - ERC20, ERC721, and ERC1155 token standards
+  - Automated deployment address management
 
 ### Common Utilities
 - **`pkg/common`**: Shared utilities and constants used across the SDK
@@ -43,6 +75,32 @@ cd examples/ethclient-usage
 go run .
 ```
 
+### Gas Comparison Tool
+
+```bash
+cd examples/gas-comparison
+
+# Test with local mock data
+go run . -fake
+
+# Test with real networks (requires Infura API key)
+go run . -infura-api-key YOUR_API_KEY
+```
+
+### Multicall Usage
+
+```bash
+cd examples/multiclient3-usage
+go run .
+```
+
+### Event Filter Example
+
+```bash
+cd examples/eventfilter-example
+go run . -account 0xYourAddress -start 19000000 -end 19100000
+```
+
 ## Testing
 
 ```bash
@@ -54,18 +112,43 @@ go test ./...
 ```
 go-wallet-sdk/
 ├── pkg/                    # Core SDK packages
-│   ├── balance/           # Balance-related functionality
+│   ├── balance/           # Balance fetching functionality
+│   ├── multicall/         # Multicall3 batching
 │   ├── ethclient/         # Ethereum client with full RPC support
+│   ├── gas/               # Gas estimation and fee suggestions
+│   ├── eventfilter/       # Event filtering for transfers
+│   ├── eventlog/          # Event log parsing
+│   ├── contracts/         # Smart contract bindings
 │   └── common/            # Shared utilities
 ├── examples/              # Usage examples
-└── README.md             # This file
+│   ├── balance-fetcher-web/       # Web interface for balance fetching
+│   ├── ethclient-usage/           # Ethereum client examples
+│   ├── gas-comparison/            # Gas fee comparison tool
+│   ├── multiclient3-usage/        # Multicall examples
+│   ├── multistandardfetcher-example/  # Multi-standard balance fetching
+│   └── eventfilter-example/       # Event filtering examples
+└── README.md              # This file
 ```
 
 ## Documentation
 
+### Package Documentation
 - [Balance Fetcher](pkg/balance/fetcher/README.md) - Balance fetching functionality
+- [Multicall](pkg/multicall/README.md) - Efficient contract call batching
 - [Ethereum Client](pkg/ethclient/README.md) - Complete Ethereum RPC client
-- [Web Example](examples/balance-fetcher-web/README.md) - Complete web application
+- [Gas Estimation](pkg/gas/README.md) - Gas fee estimation and suggestions
+- [Event Filter](pkg/eventfilter/README.md) - Event filtering for transfers
+- [Event Log Parser](pkg/eventlog/README.md) - Event log parsing
+
+### Example Documentation
+- [Web Balance Fetcher](examples/balance-fetcher-web/README.md) - Web interface for balance fetching
+- [Ethereum Client Usage](examples/ethclient-usage/README.md) - Ethereum client examples
+- [Gas Comparison](examples/gas-comparison/README.md) - Gas fee comparison tool
+- [Multicall Usage](examples/multiclient3-usage/README.md) - Multicall examples
+- [Event Filter Example](examples/eventfilter-example/README.md) - Event filtering examples
+
+### Specifications
+- [Technical Specifications](docs/specs.md) - Complete SDK specifications and architecture
 
 ## Contributing