diff --git a/examples/quick_demo.rs b/examples/quick_demo.rs
new file mode 100644
index 0000000..de9c969
--- /dev/null
+++ b/examples/quick_demo.rs
@@ -0,0 +1,314 @@
+//! Quick Demo for polyfill-rs
+//!
+//! This example demonstrates all available API endpoints in a simple, easy-to-run format.
+//! It can be run without authentication credentials and will test all public endpoints.
+
+use polyfill_rs::{ClobClient, Side, Result, PolyfillError};
+use rust_decimal::Decimal;
+use std::str::FromStr;
+use tokio::time::{sleep, Duration};
+use tracing::{info, error, warn};
+
+/// Quick demo that tests all available endpoints
+#[tokio::main]
+async fn main() -> Result<()> {
+    // Initialize logging
+    tracing_subscriber::fmt::init();
+    
+    info!("Polyfill-rs Quick Demo");
+    info!("======================");
+    
+    // Create client
+    let client = ClobClient::new("https://clob.polymarket.com");
+    
+    // Test 1: Basic connectivity
+    info!("\nTesting API Connectivity...");
+    match test_connectivity(&client).await {
+        Ok(_) => info!("API connectivity test passed"),
+        Err(e) => {
+            error!("API connectivity test failed: {}", e);
+            return Err(e);
+        }
+    }
+    
+    // Test 2: Get a valid token ID from markets
+    info!("\nGetting Market Data...");
+    let token_id = match get_valid_token_id(&client).await {
+        Ok(id) => {
+            info!("Found valid token ID: {}", id);
+            id
+        }
+        Err(e) => {
+            error!("Failed to get valid token ID: {}", e);
+            return Err(e);
+        }
+    };
+    
+    // Test 3: Test all market data endpoints
+    info!("\nTesting Market Data Endpoints...");
+    test_market_data_endpoints(&client, &token_id).await?;
+    
+    // Test 4: Test error handling
+    info!("\nTesting Error Handling...");
+    test_error_handling(&client).await?;
+    
+    // Test 5: Performance test
+    info!("\nTesting Performance...");
+    test_performance(&client, &token_id).await?;
+    
+    info!("\nAll tests completed successfully!");
+    info!("The polyfill-rs client is working correctly with the Polymarket API.");
+    
+    Ok(())
+}
+
+/// Test basic API connectivity
+async fn test_connectivity(client: &ClobClient) -> Result<()> {
+    // Test /ok endpoint
+    let is_ok = client.get_ok().await;
+    if !is_ok {
+        return Err(PolyfillError::network("API not responding", std::io::Error::new(std::io::ErrorKind::Other, "API not responding")));
+    }
+    info!("  /ok endpoint responding");
+    
+    // Test /time endpoint
+    let server_time = client.get_server_time().await?;
+    info!("  Server time: {}", server_time);
+    
+    // Verify server time is reasonable (within last 24 hours)
+    let current_time = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_secs();
+    
+    let time_diff = if server_time > current_time {
+        server_time - current_time
+    } else {
+        current_time - server_time
+    };
+    
+    if time_diff > 86400 { // 24 hours
+        warn!("  Server time seems off (diff: {} seconds)", time_diff);
+    } else {
+        info!("  Server time is reasonable");
+    }
+    
+    Ok(())
+}
+
+/// Get a valid token ID from the markets endpoint
+async fn get_valid_token_id(client: &ClobClient) -> Result<String> {
+    let markets = client.get_sampling_markets(Some(10)).await?;
+    
+    if markets.data.is_empty() {
+        return Err(PolyfillError::api(404, "No markets found"));
+    }
+    
+    // Find a market with active tokens
+    for market in &markets.data {
+        if market.active && !market.closed {
+            for token in &market.tokens {
+                if !token.token_id.is_empty() {
+                    info!("  Found active market: {}", market.question);
+                    info!("  Market slug: {}", market.market_slug);
+                    info!("  Token ID: {}", token.token_id);
+                    info!("  Outcome: {}", token.outcome);
+                    return Ok(token.token_id.clone());
+                }
+            }
+        }
+    }
+    
+    Err(PolyfillError::api(404, "No active markets with valid tokens found"))
+}
+
+/// Test all market data endpoints
+async fn test_market_data_endpoints(client: &ClobClient, token_id: &str) -> Result<()> {
+    // Test order book
+    info!("  Testing order book endpoint...");
+    let order_book = client.get_order_book(token_id).await?;
+    info!("    Order book: {} bids, {} asks", order_book.bids.len(), order_book.asks.len());
+    
+    // Test midpoint
+    info!("  Testing midpoint endpoint...");
+    let midpoint = client.get_midpoint(token_id).await?;
+    info!("    Midpoint: {}", midpoint.mid);
+    
+    // Test spread
+    info!("  Testing spread endpoint...");
+    let spread = client.get_spread(token_id).await?;
+    info!("    Spread: {}", spread.spread);
+    
+    // Test buy price
+    info!("  Testing buy price endpoint...");
+    let buy_price = client.get_price(token_id, Side::BUY).await?;
+    info!("    Buy price: {}", buy_price.price);
+    
+    // Test sell price
+    info!("  Testing sell price endpoint...");
+    let sell_price = client.get_price(token_id, Side::SELL).await?;
+    info!("    Sell price: {}", sell_price.price);
+    
+    // Test tick size
+    info!("  Testing tick size endpoint...");
+    let tick_size = client.get_tick_size(token_id).await?;
+    info!("    Tick size: {}", tick_size);
+    
+    // Test neg risk
+    info!("  Testing neg risk endpoint...");
+    let neg_risk = client.get_neg_risk(token_id).await?;
+    info!("    Neg risk: {}", neg_risk);
+    
+    // Validate data consistency
+    info!("  Validating data consistency...");
+    validate_market_data(&order_book, &midpoint, &spread, &buy_price, &sell_price)?;
+    
+    Ok(())
+}
+
+/// Validate that market data is consistent
+fn validate_market_data(
+    order_book: &polyfill_rs::client::OrderBookSummary,
+    midpoint: &polyfill_rs::client::MidpointResponse,
+    spread: &polyfill_rs::client::SpreadResponse,
+    buy_price: &polyfill_rs::client::PriceResponse,
+    sell_price: &polyfill_rs::client::PriceResponse,
+) -> Result<()> {
+    // Check that we have some liquidity
+    if order_book.bids.is_empty() && order_book.asks.is_empty() {
+        warn!("    Order book is empty");
+    } else {
+        info!("    Order book has liquidity");
+    }
+    
+    // Check that prices are positive
+    if buy_price.price <= Decimal::ZERO {
+        warn!("    Buy price is not positive: {}", buy_price.price);
+    } else {
+        info!("    Buy price is positive");
+    }
+    
+    if sell_price.price <= Decimal::ZERO {
+        warn!("    Sell price is not positive: {}", sell_price.price);
+    } else {
+        info!("    Sell price is positive");
+    }
+    
+    // Check that spread is reasonable
+    if spread.spread < Decimal::ZERO {
+        warn!("    Spread is negative: {}", spread.spread);
+    } else {
+        info!("    Spread is non-negative");
+    }
+    
+    // Check that midpoint is between buy and sell prices (if both exist)
+    if buy_price.price > Decimal::ZERO && sell_price.price > Decimal::ZERO {
+        if midpoint.mid < buy_price.price || midpoint.mid > sell_price.price {
+            warn!("    Midpoint {} is not between buy {} and sell {}", 
+                  midpoint.mid, buy_price.price, sell_price.price);
+        } else {
+            info!("    Midpoint is between buy and sell prices");
+        }
+    }
+    
+    Ok(())
+}
+
+/// Test error handling with invalid requests
+async fn test_error_handling(client: &ClobClient) -> Result<()> {
+    // Test with invalid token ID
+    info!("  Testing invalid token ID...");
+    let result = client.get_order_book("invalid_token_12345").await;
+    match result {
+        Ok(_) => {
+            warn!("    Invalid token ID returned data instead of error");
+        }
+        Err(e) => {
+            match e {
+                PolyfillError::Api { status, .. } => {
+                    if status >= 400 {
+                        info!("    Invalid token ID correctly returned error: {}", status);
+                    } else {
+                        warn!("    Unexpected status code for invalid token: {}", status);
+                    }
+                }
+                _ => {
+                    info!("    Invalid token ID returned error: {:?}", e);
+                }
+            }
+        }
+    }
+    
+    // Test with empty token ID
+    info!("  Testing empty token ID...");
+    let result = client.get_order_book("").await;
+    match result {
+        Ok(_) => {
+            warn!("    Empty token ID returned data instead of error");
+        }
+        Err(e) => {
+            info!("    Empty token ID correctly returned error: {:?}", e);
+        }
+    }
+    
+    Ok(())
+}
+
+/// Test performance characteristics
+async fn test_performance(client: &ClobClient, token_id: &str) -> Result<()> {
+    let mut total_time = Duration::from_secs(0);
+    let mut success_count = 0;
+    let test_count = 5;
+    
+    info!("  Running {} performance tests...", test_count);
+    
+    for i in 1..=test_count {
+        let start = std::time::Instant::now();
+        
+        // Test a mix of endpoints
+        let results = tokio::join!(
+            client.get_server_time(),
+            client.get_midpoint(token_id),
+            client.get_spread(token_id),
+        );
+        
+        let duration = start.elapsed();
+        total_time += duration;
+        
+        match results {
+            (Ok(_), Ok(_), Ok(_)) => {
+                success_count += 1;
+                info!("    Test {}: PASSED {:.2}ms", i, duration.as_secs_f64() * 1000.0);
+            }
+            _ => {
+                warn!("    Test {}: FAILED in {:.2}ms", i, duration.as_secs_f64() * 1000.0);
+            }
+        }
+        
+        // Small delay between tests
+        sleep(Duration::from_millis(100)).await;
+    }
+    
+    let avg_time = total_time / test_count as u32;
+    let success_rate = (success_count as f64 / test_count as f64) * 100.0;
+    
+    info!("  Performance Summary:");
+    info!("    Success rate: {:.1}%", success_rate);
+    info!("    Average response time: {:.2}ms", avg_time.as_secs_f64() * 1000.0);
+    info!("    Total time: {:.2}s", total_time.as_secs_f64());
+    
+    // Performance thresholds
+    if avg_time > Duration::from_secs(2) {
+        warn!("    Average response time is slow: {:.2}ms", avg_time.as_secs_f64() * 1000.0);
+    } else {
+        info!("    Response times are acceptable");
+    }
+    
+    if success_rate < 80.0 {
+        warn!("    Success rate is low: {:.1}%", success_rate);
+    } else {
+        info!("    Success rate is good");
+    }
+    
+    Ok(())
+}
diff --git a/scripts/run_demo.sh b/scripts/run_demo.sh
new file mode 100755
index 0000000..d0d0fcc
--- /dev/null
+++ b/scripts/run_demo.sh
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+# Demo runner for polyfill-rs
+# This script runs the quick demo to showcase all available endpoints
+
+set -e
+
+echo "Running polyfill-rs Quick Demo"
+echo "================================="
+
+# Check if we're in the right directory
+if [ ! -f "Cargo.toml" ]; then
+    echo " Error: Please run this script from the project root directory"
+    exit 1
+fi
+
+# Check if the demo example exists
+if [ ! -f "examples/quick_demo.rs" ]; then
+    echo " Error: Quick demo example not found"
+    exit 1
+fi
+
+echo "Configuration:"
+echo "  Host: https://clob.polymarket.com"
+echo "  Chain ID: 137 (Polygon)"
+echo "  Authentication: None required (public endpoints only)"
+echo ""
+
+# Run the quick demo
+echo "Running quick demo..."
+echo "===================="
+
+cargo run --example quick_demo
+
+if [ $? -eq 0 ]; then
+    echo ""
+    echo " Quick demo completed successfully!"
+    echo ""
+    echo "What was tested:"
+    echo "   API connectivity (/ok, /time)"
+    echo "   Market data retrieval (/sampling-markets)"
+    echo "   Order book data (/book)"
+    echo "   Price data (/midpoint, /spread, /price)"
+    echo "   Market metadata (/tick-size, /neg-risk)"
+    echo "   Error handling (invalid inputs)"
+    echo "   Performance characteristics"
+    echo "   Data consistency validation"
+    echo ""
+    echo "The polyfill-rs client is working correctly with the Polymarket API!"
+else
+    echo ""
+    echo " Quick demo failed!"
+    echo "Check the output above for error details."
+    exit 1
+fi
diff --git a/src/book.rs b/src/book.rs
index 4eeff50..1131517 100644
--- a/src/book.rs
+++ b/src/book.rs
@@ -567,21 +567,26 @@ impl OrderBook {
     /// Get the total liquidity at a given price level
     /// Tells you how much you can buy/sell at exactly this price
     pub fn liquidity_at_price(&self, price: Decimal, side: Side) -> Decimal {
+        let price_u32 = decimal_to_price(price).unwrap_or(0);
         match side {
-            Side::BUY => self.asks.get(&price).copied().unwrap_or_default(), // How much we can buy at this price
-            Side::SELL => self.bids.get(&price).copied().unwrap_or_default(), // How much we can sell at this price
+            Side::BUY => Decimal::from(self.asks.get(&price_u32).copied().unwrap_or_default()), // How much we can buy at this price
+            Side::SELL => Decimal::from(self.bids.get(&price_u32).copied().unwrap_or_default()), // How much we can sell at this price
         }
     }
 
     /// Get the total liquidity within a price range
     /// Useful for understanding how much depth exists in a certain price band
     pub fn liquidity_in_range(&self, min_price: Decimal, max_price: Decimal, side: Side) -> Decimal {
+        let min_price_u32 = decimal_to_price(min_price).unwrap_or(0);
+        let max_price_u32 = decimal_to_price(max_price).unwrap_or(0);
+        
         let levels: Vec<_> = match side {
-            Side::BUY => self.asks.range(min_price..=max_price).collect(),
-            Side::SELL => self.bids.range(min_price..=max_price).rev().collect(),
+            Side::BUY => self.asks.range(min_price_u32..=max_price_u32).collect(),
+            Side::SELL => self.bids.range(min_price_u32..=max_price_u32).rev().collect(),
         };
 
-        levels.into_iter().map(|(_, &size)| size).sum()
+        let total: i64 = levels.into_iter().map(|(_, &size)| size).sum();
+        Decimal::from(total)
     }
 
     /// Validate that prices are properly ordered
@@ -738,8 +743,8 @@ impl OrderBook {
     pub fn analytics(&self) -> BookAnalytics {
         let bid_count = self.bids.len();
         let ask_count = self.asks.len();
-        let total_bid_size: Decimal = self.bids.values().sum(); // Add up all bid sizes
-        let total_ask_size: Decimal = self.asks.values().sum(); // Add up all ask sizes
+        let total_bid_size: Decimal = Decimal::from(self.bids.values().sum::<i64>()); // Add up all bid sizes
+        let total_ask_size: Decimal = Decimal::from(self.asks.values().sum::<i64>()); // Add up all ask sizes
 
         BookAnalytics {
             token_id: self.token_id.clone(),
diff --git a/src/types.rs b/src/types.rs
index 88960a1..b7def27 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -6,6 +6,7 @@
 use alloy_primitives::{Address, U256};
 use chrono::{DateTime, Utc};
 use rust_decimal::Decimal;
+use rust_decimal::prelude::ToPrimitive;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use uuid::Uuid;
@@ -90,7 +91,7 @@ pub const MAX_QTY: Qty = Qty::MAX / 2; // Leave room for intermediate calculatio
 /// - decimal_to_price(Decimal::from_str("0.6543")) = Ok(6543)
 /// - decimal_to_price(Decimal::from_str("1.0000")) = Ok(10000)
 /// - decimal_to_price(Decimal::from_str("0.00005")) = Ok(1) // Rounds up to min tick
-pub fn decimal_to_price(decimal: Decimal) -> Result<Price, &'static str> {
+pub fn decimal_to_price(decimal: Decimal) -> std::result::Result<Price, &'static str> {
     // Convert to fixed-point by multiplying by scale factor
     let scaled = decimal * Decimal::from(SCALE_FACTOR);
     
@@ -131,7 +132,7 @@ pub fn price_to_decimal(ticks: Price) -> Decimal {
 /// Examples:
 /// - decimal_to_qty(Decimal::from_str("100.0")) = Ok(1000000)
 /// - decimal_to_qty(Decimal::from_str("-50.5")) = Ok(-505000)
-pub fn decimal_to_qty(decimal: Decimal) -> Result<Qty, &'static str> {
+pub fn decimal_to_qty(decimal: Decimal) -> std::result::Result<Qty, &'static str> {
     let scaled = decimal * Decimal::from(SCALE_FACTOR);
     let rounded = scaled.round();
     
@@ -299,7 +300,7 @@ impl FastBookLevel {
     
     /// Create from external BookLevel (with validation)
     /// This is called when we receive data from the API
-    pub fn from_book_level(level: &BookLevel) -> Result<Self, &'static str> {
+    pub fn from_book_level(level: &BookLevel) -> std::result::Result<Self, &'static str> {
         let price = decimal_to_price(level.price)?;
         let size = decimal_to_qty(level.size)?;
         Ok(Self::new(price, size))
@@ -374,7 +375,7 @@ impl FastOrderDelta {
     /// This is where we enforce tick alignment - if the incoming price
     /// doesn't align to valid ticks, we either reject it or round it.
     /// This prevents bad data from corrupting our order book.
-    pub fn from_order_delta(delta: &OrderDelta, tick_size: Option<Decimal>) -> Result<Self, &'static str> {
+    pub fn from_order_delta(delta: &OrderDelta, tick_size: Option<Decimal>) -> std::result::Result<Self, &'static str> {
         // Validate tick alignment if we have a tick size
         if let Some(tick_size) = tick_size {
             if !is_price_tick_aligned(delta.price, tick_size) {
diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
index c2848bf..72f0924 100644
--- a/tests/integration_tests.rs
+++ b/tests/integration_tests.rs
@@ -3,11 +3,12 @@
 //! These tests verify that our client can actually communicate with the real Polymarket API.
 //! They require network connectivity and may take longer to run.
 
-use polyfill_rs::{ClobClient, Result, PolyfillError};
+use polyfill_rs::{ClobClient, Result, PolyfillError, Side};
 use rust_decimal::Decimal;
 use std::str::FromStr;
 use std::env;
 use tokio::time::{sleep, Duration};
+use tracing::{info, error, warn};
 
 const POLYMARKET_HOST: &str = "https://clob.polymarket.com";
 const POLYGON_CHAIN_ID: u64 = 137;
@@ -52,7 +53,7 @@ async fn test_api_connectivity() -> Result<()> {
     let server_time = client.get_server_time().await?;
     assert!(server_time > 0, "Invalid server time received");
     
-    println!("✅ API connectivity test passed");
+    println!("API connectivity test passed");
     Ok(())
 }
 
@@ -97,7 +98,7 @@ async fn test_market_data_endpoints() -> Result<()> {
     let neg_risk = client.get_neg_risk(token_id).await?;
     // neg_risk is a boolean, so just verify it doesn't panic
     
-    println!("✅ Market data endpoints test passed");
+    println!("Market data endpoints test passed");
     Ok(())
 }
 
@@ -111,7 +112,7 @@ async fn test_error_handling() -> Result<()> {
     match result {
         Ok(_) => {
             // Some APIs might return empty data instead of error
-            println!("⚠️  Invalid token_id returned data instead of error");
+            println!("Invalid token_id returned data instead of error");
         }
         Err(e) => {
             match e {
@@ -126,7 +127,7 @@ async fn test_error_handling() -> Result<()> {
         }
     }
     
-    println!("✅ Error handling test passed");
+    println!(" Error handling test passed");
     Ok(())
 }
 
@@ -149,7 +150,7 @@ async fn test_rate_limiting() -> Result<()> {
     let success_count = results.iter().filter(|r| r.is_ok()).count();
     assert!(success_count >= 3, "Too many requests failed: {}/5", success_count);
     
-    println!("✅ Rate limiting test passed");
+    println!(" Rate limiting test passed");
     Ok(())
 }
 
@@ -175,7 +176,7 @@ async fn test_api_compatibility() -> Result<()> {
     assert_eq!(order_args.token_id, "test_token");
     assert_eq!(order_args.side, polyfill_rs::Side::BUY);
     
-    println!("✅ API compatibility test passed");
+    println!(" API compatibility test passed");
     Ok(())
 }
 
@@ -197,10 +198,268 @@ async fn test_performance() -> Result<()> {
     assert!(server_time_duration < Duration::from_secs(5), "Server time too slow: {:?}", server_time_duration);
     assert!(markets_duration < Duration::from_secs(10), "Markets request too slow: {:?}", markets_duration);
     
-    println!("✅ Performance test passed");
+    println!(" Performance test passed");
     println!("  Server time: {:?}", server_time_duration);
     println!("  Markets request: {:?}", markets_duration);
     println!("  Markets returned: {}", markets.data.len());
     
+    Ok(())
+}
+
+/// Comprehensive test of all market data endpoints
+#[tokio::test]
+async fn test_all_market_data_endpoints() -> Result<()> {
+    let client = ClobClient::new(POLYMARKET_HOST);
+    
+    // Get a valid token ID first
+    let markets_response = client.get_sampling_markets(Some(5)).await?;
+    assert!(!markets_response.data.is_empty(), "No markets returned");
+    
+    let first_market = &markets_response.data[0];
+    let token_id = &first_market.tokens[0].token_id;
+    
+    println!("Testing all endpoints with token_id: {}", token_id);
+    
+    // Test all endpoints systematically
+    let endpoints = vec![
+        ("Order Book", Box::new(|| client.get_order_book(token_id)) as Box<dyn Fn() -> _>),
+        ("Midpoint", Box::new(|| client.get_midpoint(token_id))),
+        ("Spread", Box::new(|| client.get_spread(token_id))),
+        ("Buy Price", Box::new(|| client.get_price(token_id, Side::BUY))),
+        ("Sell Price", Box::new(|| client.get_price(token_id, Side::SELL))),
+        ("Tick Size", Box::new(|| client.get_tick_size(token_id))),
+        ("Neg Risk", Box::new(|| client.get_neg_risk(token_id))),
+    ];
+    
+    let mut success_count = 0;
+    let mut total_time = Duration::from_secs(0);
+    
+    for (name, endpoint_test) in endpoints {
+        let start = std::time::Instant::now();
+        match endpoint_test().await {
+            Ok(_) => {
+                let duration = start.elapsed();
+                total_time += duration;
+                success_count += 1;
+                println!("   {}: {:.2}ms", name, duration.as_secs_f64() * 1000.0);
+            }
+            Err(e) => {
+                let duration = start.elapsed();
+                total_time += duration;
+                println!("   {}: {:.2}ms - {}", name, duration.as_secs_f64() * 1000.0, e);
+            }
+        }
+        
+        // Small delay between requests
+        sleep(Duration::from_millis(100)).await;
+    }
+    
+    let avg_time = total_time / endpoints.len() as u32;
+    let success_rate = (success_count as f64 / endpoints.len() as f64) * 100.0;
+    
+    println!("Endpoint Test Summary:");
+    println!("  Success rate: {:.1}%", success_rate);
+    println!("  Average response time: {:.2}ms", avg_time.as_secs_f64() * 1000.0);
+    
+    // Require at least 80% success rate
+    assert!(success_rate >= 80.0, "Success rate too low: {:.1}%", success_rate);
+    
+    Ok(())
+}
+
+/// Test data consistency across endpoints
+#[tokio::test]
+async fn test_data_consistency() -> Result<()> {
+    let client = ClobClient::new(POLYMARKET_HOST);
+    
+    // Get a valid token ID
+    let markets_response = client.get_sampling_markets(Some(5)).await?;
+    let first_market = &markets_response.data[0];
+    let token_id = &first_market.tokens[0].token_id;
+    
+    println!("Testing data consistency with token_id: {}", token_id);
+    
+    // Get all market data
+    let order_book = client.get_order_book(token_id).await?;
+    let midpoint = client.get_midpoint(token_id).await?;
+    let spread = client.get_spread(token_id).await?;
+    let buy_price = client.get_price(token_id, Side::BUY).await?;
+    let sell_price = client.get_price(token_id, Side::SELL).await?;
+    let tick_size = client.get_tick_size(token_id).await?;
+    let neg_risk = client.get_neg_risk(token_id).await?;
+    
+    // Validate data consistency
+    println!("Data validation:");
+    
+    // Check that prices are positive
+    assert!(buy_price.price > Decimal::ZERO, "Buy price should be positive: {}", buy_price.price);
+    assert!(sell_price.price > Decimal::ZERO, "Sell price should be positive: {}", sell_price.price);
+    println!("   Prices are positive");
+    
+    // Check that spread is non-negative
+    assert!(spread.spread >= Decimal::ZERO, "Spread should be non-negative: {}", spread.spread);
+    println!("   Spread is non-negative");
+    
+    // Check that tick size is positive
+    assert!(tick_size > Decimal::ZERO, "Tick size should be positive: {}", tick_size);
+    println!("   Tick size is positive");
+    
+    // Check that midpoint is reasonable (between buy and sell if both exist)
+    if buy_price.price > Decimal::ZERO && sell_price.price > Decimal::ZERO {
+        if midpoint.mid < buy_price.price || midpoint.mid > sell_price.price {
+            println!("    Midpoint {} is not between buy {} and sell {}", 
+                    midpoint.mid, buy_price.price, sell_price.price);
+        } else {
+            println!("   Midpoint is between buy and sell prices");
+        }
+    }
+    
+    // Check that we have some order book data
+    if order_book.bids.is_empty() && order_book.asks.is_empty() {
+        println!("    Order book is empty");
+    } else {
+        println!("   Order book has liquidity ({} bids, {} asks)", 
+                order_book.bids.len(), order_book.asks.len());
+    }
+    
+    // Check neg risk is a boolean
+    println!("   Neg risk is boolean: {}", neg_risk);
+    
+    println!(" Data consistency test passed");
+    Ok(())
+}
+
+/// Test rate limiting behavior more thoroughly
+#[tokio::test]
+async fn test_comprehensive_rate_limiting() -> Result<()> {
+    let client = ClobClient::new(POLYMARKET_HOST);
+    
+    println!("Testing rate limiting with rapid requests...");
+    
+    // Make many rapid requests
+    let mut results = Vec::new();
+    let request_count = 20;
+    
+    for i in 0..request_count {
+        let start = std::time::Instant::now();
+        let result = client.get_server_time().await;
+        let duration = start.elapsed();
+        
+        results.push((i, result, duration));
+        
+        // Very small delay to test rate limiting
+        sleep(Duration::from_millis(50)).await;
+    }
+    
+    // Analyze results
+    let success_count = results.iter().filter(|(_, result, _)| result.is_ok()).count();
+    let failure_count = results.iter().filter(|(_, result, _)| result.is_err()).count();
+    
+    let success_rate = (success_count as f64 / request_count as f64) * 100.0;
+    
+    println!("Rate limiting test results:");
+    println!("  Total requests: {}", request_count);
+    println!("  Successful: {}", success_count);
+    println!("  Failed: {}", failure_count);
+    println!("  Success rate: {:.1}%", success_rate);
+    
+    // Show timing for first few requests
+    for (i, result, duration) in results.iter().take(5) {
+        let status = if result.is_ok() { "" } else { "" };
+        println!("  Request {}: {} {:.2}ms", i + 1, status, duration.as_secs_f64() * 1000.0);
+    }
+    
+    // We expect some failures due to rate limiting, but not too many
+    assert!(success_rate >= 50.0, "Success rate too low, possible rate limiting issues: {:.1}%", success_rate);
+    
+    println!(" Rate limiting test passed");
+    Ok(())
+}
+
+/// Test error handling with various invalid inputs
+#[tokio::test]
+async fn test_comprehensive_error_handling() -> Result<()> {
+    let client = ClobClient::new(POLYMARKET_HOST);
+    
+    println!("Testing comprehensive error handling...");
+    
+    // Test various invalid token IDs
+    let invalid_tokens = vec![
+        "",
+        "invalid",
+        "12345",
+        "0x1234567890123456789012345678901234567890",
+        "very_long_invalid_token_id_that_should_fail",
+    ];
+    
+    for token_id in invalid_tokens {
+        println!("  Testing invalid token ID: '{}'", token_id);
+        
+        let result = client.get_order_book(token_id).await;
+        match result {
+            Ok(order_book) => {
+                if order_book.bids.is_empty() && order_book.asks.is_empty() {
+                    println!("      Empty order book returned (acceptable)");
+                } else {
+                    println!("      Unexpected data returned for invalid token");
+                }
+            }
+            Err(e) => {
+                match e {
+                    PolyfillError::Api { status, .. } => {
+                        if status >= 400 {
+                            println!("     Correctly returned API error: {}", status);
+                        } else {
+                            println!("      Unexpected status code: {}", status);
+                        }
+                    }
+                    _ => {
+                        println!("     Correctly returned error: {:?}", e);
+                    }
+                }
+            }
+        }
+    }
+    
+    println!(" Error handling test passed");
+    Ok(())
+}
+
+/// Test concurrent requests
+#[tokio::test]
+async fn test_concurrent_requests() -> Result<()> {
+    let client = ClobClient::new(POLYMARKET_HOST);
+    
+    println!("Testing concurrent requests...");
+    
+    // Get a valid token ID
+    let markets_response = client.get_sampling_markets(Some(5)).await?;
+    let token_id = &markets_response.data[0].tokens[0].token_id;
+    
+    // Make concurrent requests
+    let start = std::time::Instant::now();
+    
+    let results = tokio::join!(
+        client.get_server_time(),
+        client.get_midpoint(token_id),
+        client.get_spread(token_id),
+        client.get_price(token_id, Side::BUY),
+        client.get_price(token_id, Side::SELL),
+    );
+    
+    let duration = start.elapsed();
+    
+    // Check results
+    let (server_time, midpoint, spread, buy_price, sell_price) = results;
+    
+    assert!(server_time.is_ok(), "Server time request failed");
+    assert!(midpoint.is_ok(), "Midpoint request failed");
+    assert!(spread.is_ok(), "Spread request failed");
+    assert!(buy_price.is_ok(), "Buy price request failed");
+    assert!(sell_price.is_ok(), "Sell price request failed");
+    
+    println!("   All concurrent requests succeeded");
+    println!("   Total time: {:.2}ms", duration.as_secs_f64() * 1000.0);
+    
     Ok(())
 } 
\ No newline at end of file