diff --git a/ethcore/light/src/client/mod.rs b/ethcore/light/src/client/mod.rs
index 34f7ed990..c791caed1 100644
--- a/ethcore/light/src/client/mod.rs
+++ b/ethcore/light/src/client/mod.rs
@@ -31,7 +31,7 @@ use ethcore::service::ClientIoMessage;
 use ethcore::encoded;
 use io::IoChannel;
 
-use util::{Bytes, DBValue, H256, Mutex, RwLock};
+use util::{H256, Mutex, RwLock};
 
 use self::header_chain::{AncestryIter, HeaderChain};
 
diff --git a/ethcore/light/src/net/context.rs b/ethcore/light/src/net/context.rs
index 659c117af..513388a92 100644
--- a/ethcore/light/src/net/context.rs
+++ b/ethcore/light/src/net/context.rs
@@ -20,7 +20,6 @@ use network::{NetworkContext, PeerId, NodeId};
 
 use super::{Announcement, LightProtocol, ReqId};
 use super::error::Error;
-use request::{self, Request};
 use request_builder::Requests;
 
 /// An I/O context which allows sending and receiving packets as well as
diff --git a/ethcore/light/src/net/mod.rs b/ethcore/light/src/net/mod.rs
index 57459ec01..0241cf3f1 100644
--- a/ethcore/light/src/net/mod.rs
+++ b/ethcore/light/src/net/mod.rs
@@ -18,14 +18,13 @@
 //!
 //! This uses a "Provider" to answer requests.
 
-use ethcore::transaction::{Action, UnverifiedTransaction};
-use ethcore::receipt::Receipt;
+use ethcore::transaction::UnverifiedTransaction;
 
 use io::TimerToken;
 use network::{NetworkProtocolHandler, NetworkContext, PeerId};
 use rlp::{RlpStream, Stream, UntrustedRlp, View};
 use util::hash::H256;
-use util::{Bytes, DBValue, Mutex, RwLock, U256};
+use util::{DBValue, Mutex, RwLock, U256};
 use time::{Duration, SteadyTime};
 
 use std::collections::HashMap;
@@ -34,7 +33,7 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 use provider::Provider;
-use request::{self, HashOrNumber, Request, Response};
+use request::{Request, Response};
 use request_builder::Requests;
 
 use self::request_credits::{Credits, FlowParams};
@@ -48,8 +47,8 @@ mod error;
 mod status;
 mod request_set;
 
-#[cfg(test)]
-mod tests;
+// #[cfg(test)]
+// mod tests;
 
 pub mod request_credits;
 
diff --git a/ethcore/light/src/net/request_credits.rs b/ethcore/light/src/net/request_credits.rs
index e3821e05a..abeb7e569 100644
--- a/ethcore/light/src/net/request_credits.rs
+++ b/ethcore/light/src/net/request_credits.rs
@@ -27,7 +27,6 @@
 //! on any empirical timings or mathematical models.
 
 use request::{self, Request};
-use super::packet;
 use super::error::Error;
 
 use rlp::*;
@@ -107,13 +106,63 @@ impl Default for CostTable {
 
 impl RlpEncodable for CostTable {
 	fn rlp_append(&self, s: &mut RlpStream) {
-		unimplemented!()
+		fn append_cost(s: &mut RlpStream, cost: &U256, kind: request::Kind) {
+			s.begin_list(2).append(&kind).append(cost);
+		}
+
+		s.begin_list(9).append(&self.base);
+		append_cost(s, &self.headers, request::Kind::Headers);
+		append_cost(s, &self.body, request::Kind::Body);
+		append_cost(s, &self.receipts, request::Kind::Receipts);
+		append_cost(s, &self.account, request::Kind::Account);
+		append_cost(s, &self.storage, request::Kind::Storage);
+		append_cost(s, &self.code, request::Kind::Code);
+		append_cost(s, &self.header_proof, request::Kind::HeaderProof);
+		append_cost(s, &self.transaction_proof, request::Kind::Execution);
 	}
 }
 
 impl RlpDecodable for CostTable {
 	fn decode<D>(decoder: &D) -> Result<Self, DecoderError> where D: Decoder {
-		unimplemented!()
+		let rlp = decoder.as_rlp();
+		let base = rlp.val_at(0)?;
+
+		let mut headers = None;
+		let mut body = None;
+		let mut receipts = None;
+		let mut account = None;
+		let mut storage = None;
+		let mut code = None;
+		let mut header_proof = None;
+		let mut transaction_proof = None;
+
+		for cost_list in rlp.iter().skip(1) {
+			let cost = cost_list.val_at(1)?;
+			match cost_list.val_at(0)? {
+				request::Kind::Headers => headers = Some(cost),
+				request::Kind::Body => body = Some(cost),
+				request::Kind::Receipts => receipts = Some(cost),
+				request::Kind::Account => account = Some(cost),
+				request::Kind::Storage => storage = Some(cost),
+				request::Kind::Code => code = Some(cost),
+				request::Kind::HeaderProof => header_proof = Some(cost),
+				request::Kind::Execution => transaction_proof = Some(cost),
+			}
+		}
+
+		let unwrap_cost = |cost: Option<U256>| cost.ok_or(DecoderError::Custom("Not all costs specified in cost table."));
+
+		Ok(CostTable {
+			base: base,
+			headers: unwrap_cost(headers)?,
+			body: unwrap_cost(body)?,
+			receipts: unwrap_cost(receipts)?,
+			account: unwrap_cost(account)?,
+			storage: unwrap_cost(storage)?,
+			code: unwrap_cost(code)?,
+			header_proof: unwrap_cost(header_proof)?,
+			transaction_proof: unwrap_cost(transaction_proof)?,
+		})
 	}
 }
 
diff --git a/ethcore/light/src/net/request_set.rs b/ethcore/light/src/net/request_set.rs
index eefc6dfd5..8405b8c89 100644
--- a/ethcore/light/src/net/request_set.rs
+++ b/ethcore/light/src/net/request_set.rs
@@ -24,7 +24,7 @@
 use std::collections::{BTreeMap, HashMap};
 use std::iter::FromIterator;
 
-use request::{self, Request};
+use request::Request;
 use request_builder::Requests;
 use net::{timeout, ReqId};