diff --git a/src/proto_alpha/lib_protocol/src/alpha_context.mli b/src/proto_alpha/lib_protocol/src/alpha_context.mli
index 536f4ceb7..35feeffd6 100644
--- a/src/proto_alpha/lib_protocol/src/alpha_context.mli
+++ b/src/proto_alpha/lib_protocol/src/alpha_context.mli
@@ -104,6 +104,8 @@ module Cycle : sig
   val sub: cycle -> int -> cycle option
   val to_int32: cycle -> int32
 
+  module Map : S.MAP with type key = cycle
+
 end
 
 module Gas : sig
@@ -617,6 +619,9 @@ module Delegate : sig
     context -> public_key_hash -> Cycle.t ->
     (context * Tez.t) tzresult Lwt.t
 
+  val full_balance:
+    context -> public_key_hash -> Tez.t tzresult Lwt.t
+
   val has_frozen_balance:
     context -> public_key_hash -> Cycle.t ->
     bool tzresult Lwt.t
@@ -624,17 +629,34 @@ module Delegate : sig
   val frozen_balance:
     context -> public_key_hash -> Tez.t tzresult Lwt.t
 
-  type frozen_balances = {
+  type frozen_balance = {
     deposit : Tez.t ;
     fees : Tez.t ;
     rewards : Tez.t ;
   }
 
-  val frozen_balances:
-    context -> public_key_hash -> frozen_balances tzresult Lwt.t
+  val frozen_balance_encoding: frozen_balance Data_encoding.t
+  val frozen_balances_encoding: frozen_balance Cycle.Map.t Data_encoding.t
 
-  val full_balance:
-    context -> public_key_hash -> Tez.t tzresult Lwt.t
+  val frozen_balances:
+    context -> Signature.Public_key_hash.t ->
+    frozen_balance Cycle.Map.t Lwt.t
+
+  val get_delegated_contracts:
+    context -> Signature.Public_key_hash.t ->
+    Contract_hash.t list Lwt.t
+
+  val delegated_balance:
+    context -> Signature.Public_key_hash.t ->
+    Tez.t tzresult Lwt.t
+
+  val deactivated:
+    context -> Signature.Public_key_hash.t ->
+    bool Lwt.t
+
+  val grace_period:
+    context -> Signature.Public_key_hash.t ->
+    Cycle.t tzresult Lwt.t
 
 end
 
@@ -865,6 +887,11 @@ end
 
 module Roll : sig
 
+  type t = private int32
+  type roll = t
+
+  val encoding: roll Data_encoding.t
+
   val snapshot_rolls: context -> context tzresult Lwt.t
   val cycle_end: context -> Cycle.t -> context tzresult Lwt.t
 
@@ -877,6 +904,11 @@ module Roll : sig
   val delegate_pubkey:
     context -> public_key_hash -> public_key tzresult Lwt.t
 
+  val get_rolls:
+    context -> Signature.Public_key_hash.t -> roll list tzresult Lwt.t
+  val get_change:
+    context -> Signature.Public_key_hash.t -> Tez.t tzresult Lwt.t
+
 end
 
 module Commitment : sig
diff --git a/src/proto_alpha/lib_protocol/src/cycle_repr.ml b/src/proto_alpha/lib_protocol/src/cycle_repr.ml
index cadd30a90..d6179d538 100644
--- a/src/proto_alpha/lib_protocol/src/cycle_repr.ml
+++ b/src/proto_alpha/lib_protocol/src/cycle_repr.ml
@@ -28,6 +28,8 @@ let pp ppf cycle = Format.fprintf ppf "%ld" cycle
 
 include (Compare.Int32 : Compare.S with type t := t)
 
+module Map = Map.Make(Compare.Int32)
+
 let root = 0l
 let succ = Int32.succ
 let pred = function
diff --git a/src/proto_alpha/lib_protocol/src/cycle_repr.mli b/src/proto_alpha/lib_protocol/src/cycle_repr.mli
index 724780989..3e4308d4f 100644
--- a/src/proto_alpha/lib_protocol/src/cycle_repr.mli
+++ b/src/proto_alpha/lib_protocol/src/cycle_repr.mli
@@ -23,6 +23,8 @@ val succ: cycle -> cycle
 val to_int32: cycle -> int32
 val of_int32_exn: int32 -> cycle
 
+module Map : S.MAP with type key = cycle
+
 module Index : sig
   (* Storage_functors.INDEX with type t = cycle *)
   type t = cycle
diff --git a/src/proto_alpha/lib_protocol/src/delegate_services.ml b/src/proto_alpha/lib_protocol/src/delegate_services.ml
index fb748a760..22d8e605e 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_services.ml
+++ b/src/proto_alpha/lib_protocol/src/delegate_services.ml
@@ -16,6 +16,221 @@ let slots_range_encoding =
      (opt "first_level" Raw_level.encoding)
      (opt "last_level" Raw_level.encoding))
 
+type info = {
+  balance: Tez.t ;
+  frozen_balance: Tez.t ;
+  frozen_balances: Delegate.frozen_balance Cycle.Map.t ;
+  delegated_balance: Tez.t ;
+  delegated_contracts: Contract_hash.t list ;
+  deactivated: bool ;
+  grace_period: Cycle.t ;
+}
+
+let info_encoding =
+  let open Data_encoding in
+  conv
+    (fun { balance ; frozen_balance ; frozen_balances ; delegated_balance ;
+           delegated_contracts ; deactivated ; grace_period } ->
+      (balance, frozen_balance, frozen_balances, delegated_balance,
+       delegated_contracts, deactivated, grace_period))
+    (fun (balance, frozen_balance, frozen_balances, delegated_balance,
+          delegated_contracts, deactivated, grace_period) ->
+      { balance ; frozen_balance ; frozen_balances ; delegated_balance ;
+        delegated_contracts ; deactivated ; grace_period })
+    (obj7
+      (req "balance" Tez.encoding)
+      (req "frozen_balance" Tez.encoding)
+      (req "frozen_balances" Delegate.frozen_balances_encoding)
+      (req "delegated_balance" Tez.encoding)
+      (req "delegated_contracts" (list Contract_hash.encoding))
+      (req "deactivated" bool)
+      (req "grace_period" Cycle.encoding))
+
+module S = struct
+
+  let path = RPC_path.(open_root / "delegate")
+
+  open Data_encoding
+
+  type list_query = {
+    active: bool ;
+    inactive: bool ;
+  }
+  let list_query :list_query RPC_query.t =
+    let open RPC_query in
+    query (fun active inactive -> { active ; inactive })
+    |+ flag "active" (fun t -> t.active)
+    |+ flag "inactive" (fun t -> t.inactive)
+    |> seal
+
+  let list_delegate =
+    RPC_service.get_service
+      ~description:
+        "List all registred delegates."
+      ~query: list_query
+      ~output: (list Signature.Public_key_hash.encoding)
+      path
+
+  let path = RPC_path.(path /: Signature.Public_key_hash.rpc_arg)
+
+  let info =
+    RPC_service.get_service
+      ~description:
+        "Everything about a delegate."
+      ~query: RPC_query.empty
+      ~output: info_encoding
+      path
+
+  let balance =
+    RPC_service.get_service
+      ~description:
+        "Returns the full balance of a given delegate, \
+         including the frozen balances."
+      ~query: RPC_query.empty
+      ~output: Tez.encoding
+      RPC_path.(path / "balance")
+
+  let frozen_balance =
+    RPC_service.get_service
+      ~description:
+        "Returns the total frozen balances of a given delegate, \
+         this includes the frozen deposits, rewards and fees."
+      ~query: RPC_query.empty
+      ~output: Tez.encoding
+      RPC_path.(path / "change")
+
+  let frozen_balances =
+    RPC_service.get_service
+      ~description:
+        "Returns the amount of frozen tokens associated to a given delegate."
+      ~query: RPC_query.empty
+      ~output: Delegate.frozen_balances_encoding
+      RPC_path.(path / "frozen_balances")
+
+  let delegated_balance =
+    RPC_service.get_service
+      ~description:
+        "Returns the total amount of token delegated to a given delegate. \
+         This includes the balance of all the contracts that delegates \
+         to it, but also the balance of the delegate itself and its frozen \
+         fees and deposits. The rewards do not count in the delegated balance \
+         until they are unfrozen."
+      ~query: RPC_query.empty
+      ~output: Tez.encoding
+      RPC_path.(path / "delegated_balance")
+
+  let delegated_contracts =
+    RPC_service.get_service
+      ~description:
+        "Returns the list of contract that delegates to a given delegate."
+      ~query: RPC_query.empty
+      ~output: (list Contract_hash.encoding)
+      RPC_path.(path / "delegated_contracts")
+
+  let deactivated =
+    RPC_service.get_service
+      ~description:
+        "Returns whether the delegate is currently tagged as deactivated or not."
+      ~query: RPC_query.empty
+      ~output: bool
+      RPC_path.(path / "deactivated")
+
+  let grace_period =
+    RPC_service.get_service
+      ~description:
+        "Returns the cycle by the end of which the delegate might be \
+         deactivated, whether should she failed to execute any delegate \
+         action until then. \
+         A deactivated delegate might be reactivated \
+         (without loosing any rolls) by simply re-register as a delegate. \
+         For deactivated delegate this value contains the cycle by which \
+         they were deactivated."
+      ~query: RPC_query.empty
+      ~output: Cycle.encoding
+      RPC_path.(path / "grace_period")
+
+end
+
+let () =
+  let open Services_registration in
+  register0 S.list_delegate begin fun ctxt q () ->
+    Delegate.list ctxt >>= fun delegates ->
+    if q.active && q.inactive then
+      return delegates
+    else if q.active then
+      Lwt_list.filter_p
+        (fun pkh -> Delegate.deactivated ctxt pkh >|= not)
+        delegates >>= return
+    else if q.inactive then
+      Lwt_list.filter_p
+        (fun pkh -> Delegate.deactivated ctxt pkh)
+        delegates >>= return
+    else
+      return []
+  end ;
+  register1 S.info begin fun ctxt pkh () () ->
+    Delegate.full_balance ctxt pkh >>=? fun balance ->
+    Delegate.frozen_balance ctxt pkh >>=? fun frozen_balance ->
+    Delegate.frozen_balances ctxt pkh >>= fun frozen_balances ->
+    Delegate.delegated_balance ctxt pkh >>=? fun delegated_balance ->
+    Delegate.get_delegated_contracts ctxt pkh >>= fun delegated_contracts ->
+    Delegate.deactivated ctxt pkh >>= fun deactivated ->
+    Delegate.grace_period ctxt pkh >>=? fun grace_period ->
+    return {
+      balance ; frozen_balance ; frozen_balances ; delegated_balance ;
+      delegated_contracts ; deactivated ; grace_period
+    }
+  end ;
+  register1 S.balance begin fun ctxt pkh () () ->
+    Delegate.full_balance ctxt pkh
+  end ;
+  register1 S.frozen_balance begin fun ctxt pkh () () ->
+    Delegate.frozen_balance ctxt pkh
+  end ;
+  register1 S.frozen_balances begin fun ctxt pkh () () ->
+    Delegate.frozen_balances ctxt pkh >>= return
+  end ;
+  register1 S.delegated_balance begin fun ctxt pkh () () ->
+    Delegate.delegated_balance ctxt pkh
+  end ;
+  register1 S.delegated_contracts begin fun ctxt pkh () () ->
+    Delegate.get_delegated_contracts ctxt pkh >>= return
+  end ;
+  register1 S.deactivated begin fun ctxt pkh () () ->
+    Delegate.deactivated ctxt pkh >>= return
+  end ;
+  register1 S.grace_period begin fun ctxt pkh () () ->
+    Delegate.grace_period ctxt pkh
+  end
+
+let list ctxt block ?(active = true) ?(inactive = false) () =
+  RPC_context.make_call0 S.list_delegate ctxt block { active ; inactive } ()
+
+let info ctxt block pkh =
+  RPC_context.make_call1 S.info ctxt block pkh () ()
+
+let balance ctxt block pkh =
+  RPC_context.make_call1 S.balance ctxt block pkh () ()
+
+let frozen_balance ctxt block pkh =
+  RPC_context.make_call1 S.frozen_balance ctxt block pkh () ()
+
+let frozen_balances ctxt block pkh =
+  RPC_context.make_call1 S.frozen_balances ctxt block pkh () ()
+
+let delegated_balance ctxt block pkh =
+  RPC_context.make_call1 S.delegated_balance ctxt block pkh () ()
+
+let delegated_contracts ctxt block pkh =
+  RPC_context.make_call1 S.delegated_contracts ctxt block pkh () ()
+
+let deactivated ctxt block pkh =
+  RPC_context.make_call1 S.deactivated ctxt block pkh () ()
+
+let grace_period ctxt block pkh =
+  RPC_context.make_call1 S.grace_period ctxt block pkh () ()
+
+
 module Baker = struct
 
   module S = struct
@@ -322,37 +537,6 @@ module Endorser = struct
 
 end
 
-module S = struct
-  let frozen_balances_encoding =
-    let open Delegate in
-    Data_encoding.(
-      conv
-        (fun { deposit ; fees ; rewards } ->
-           (deposit, fees, rewards))
-        (fun (deposit, fees, rewards) ->
-           { deposit ; fees ; rewards }
-        )
-        (obj3
-           (req "deposit" Tez.encoding)
-           (req "fees" Tez.encoding)
-           (req "rewards" Tez.encoding)))
-
-  let frozen_balances =
-    RPC_service.post_service
-      ~description: "Returns the amount of frozen tokens associated to a given key."
-      ~query: RPC_query.empty
-      ~input: Data_encoding.empty
-      ~output: frozen_balances_encoding
-      RPC_path.(open_root / "delegate" /: Signature.Public_key_hash.rpc_arg / "frozen_balances")
-end
-let () =
-  let open Services_registration in
-  register1 S.frozen_balances begin fun ctxt pkh () () ->
-    Delegate.frozen_balances ctxt pkh
-  end
-
-let frozen_balances ctxt block pkh =
-  RPC_context.make_call1 S.frozen_balances ctxt block pkh () ()
 
 let baking_rights = Baker.I.baking_rights
 let endorsement_rights = Endorser.I.endorsement_rights
diff --git a/src/proto_alpha/lib_protocol/src/delegate_services.mli b/src/proto_alpha/lib_protocol/src/delegate_services.mli
index 174e90e90..ae1966a0f 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_services.mli
+++ b/src/proto_alpha/lib_protocol/src/delegate_services.mli
@@ -9,10 +9,64 @@
 
 open Alpha_context
 
+val list:
+  'a #RPC_context.simple -> 'a ->
+  ?active:bool ->
+  ?inactive:bool ->
+  unit -> Signature.Public_key_hash.t list shell_tzresult Lwt.t
+
+type info = {
+  balance: Tez.t ;
+  frozen_balance: Tez.t ;
+  frozen_balances: Delegate.frozen_balance Cycle.Map.t ;
+  delegated_balance: Tez.t ;
+  delegated_contracts: Contract_hash.t list ;
+  deactivated: bool ;
+  grace_period: Cycle.t ;
+}
+
+val info_encoding: info Data_encoding.t
+
+val info:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  info shell_tzresult Lwt.t
+
+val balance:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  Tez.t shell_tzresult Lwt.t
+
+val frozen_balance:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  Tez.t shell_tzresult Lwt.t
+
 val frozen_balances:
   'a #RPC_context.simple -> 'a ->
   Signature.Public_key_hash.t ->
-  Delegate.frozen_balances shell_tzresult Lwt.t
+  Delegate.frozen_balance Cycle.Map.t shell_tzresult Lwt.t
+
+val delegated_balance:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  Tez.t shell_tzresult Lwt.t
+
+val delegated_contracts:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  Contract_hash.t list shell_tzresult Lwt.t
+
+val deactivated:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  bool shell_tzresult Lwt.t
+
+val grace_period:
+  'a #RPC_context.simple -> 'a ->
+  Signature.Public_key_hash.t ->
+  Cycle.t shell_tzresult Lwt.t
+
 
 module Baker : sig
 
diff --git a/src/proto_alpha/lib_protocol/src/delegate_storage.ml b/src/proto_alpha/lib_protocol/src/delegate_storage.ml
index 8c93847e2..974b0b5eb 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_storage.ml
+++ b/src/proto_alpha/lib_protocol/src/delegate_storage.ml
@@ -193,6 +193,9 @@ let remove ctxt contract =
 let fold = Storage.Delegates.fold
 let list = Storage.Delegates.elements
 
+let get_delegated_contracts ctxt delegate =
+  let contract = Contract_repr.implicit_contract delegate in
+  Storage.Contract.Delegated.elements (ctxt, contract)
 
 let get_frozen_deposit ctxt contract cycle =
   Storage.Contract.Frozen_deposits.get_option (ctxt, contract) cycle >>=? function
@@ -349,41 +352,107 @@ let has_frozen_balance ctxt delegate cycle =
       get_frozen_rewards ctxt contract cycle >>=? fun rewards ->
       return Tez_repr.(rewards <> zero)
 
-type frozen_balances = {
+type frozen_balance = {
   deposit : Tez_repr.t ;
   fees : Tez_repr.t ;
   rewards : Tez_repr.t ;
 }
 
+let frozen_balance_encoding =
+  let open Data_encoding in
+  conv
+    (fun { deposit ; fees ; rewards } -> (deposit, fees, rewards))
+    (fun (deposit, fees, rewards) -> { deposit ; fees ; rewards })
+    (obj3
+       (req "deposit" Tez_repr.encoding)
+       (req "fees" Tez_repr.encoding)
+       (req "rewards" Tez_repr.encoding))
+
+let frozen_balances_encoding =
+  let open Data_encoding in
+  conv
+    (Cycle_repr.Map.bindings)
+    (List.fold_left
+       (fun m (c, b) -> Cycle_repr.Map.add c b m)
+       Cycle_repr.Map.empty)
+    (list (merge_objs
+             (obj1 (req "cycle" Cycle_repr.encoding))
+             frozen_balance_encoding))
+
+let empty_frozen_balance =
+  { deposit = Tez_repr.zero ;
+    fees = Tez_repr.zero ;
+    rewards = Tez_repr.zero }
+
 let frozen_balances ctxt delegate =
+  let contract = Contract_repr.implicit_contract delegate in
+  let map = Cycle_repr.Map.empty in
+  Storage.Contract.Frozen_deposits.fold
+    (ctxt, contract) ~init:map
+    ~f:(fun cycle amount map ->
+        Lwt.return
+          (Cycle_repr.Map.add cycle
+             { empty_frozen_balance with deposit = amount } map)) >>= fun map ->
+  Storage.Contract.Frozen_fees.fold
+    (ctxt, contract) ~init:map
+    ~f:(fun cycle amount map ->
+        let balance =
+          match Cycle_repr.Map.find_opt cycle map with
+          | None -> empty_frozen_balance
+          | Some balance -> balance in
+        Lwt.return
+          (Cycle_repr.Map.add cycle
+             { balance with fees = amount } map)) >>= fun map ->
+  Storage.Contract.Frozen_rewards.fold
+    (ctxt, contract) ~init:map
+    ~f:(fun cycle amount map ->
+        let balance =
+          match Cycle_repr.Map.find_opt cycle map with
+          | None -> empty_frozen_balance
+          | Some balance -> balance in
+        Lwt.return
+          (Cycle_repr.Map.add cycle
+             { balance with rewards = amount } map)) >>= fun map ->
+  Lwt.return map
+
+let frozen_balance ctxt delegate =
   let contract = Contract_repr.implicit_contract delegate in
   let balance = Ok Tez_repr.zero in
   Storage.Contract.Frozen_deposits.fold
     (ctxt, contract) ~init:balance
     ~f:(fun _cycle amount acc ->
         Lwt.return acc >>=? fun acc ->
-        Lwt.return (Tez_repr.(acc +? amount))) >>=? fun deposit ->
+        Lwt.return (Tez_repr.(acc +? amount))) >>= fun balance ->
   Storage.Contract.Frozen_fees.fold
     (ctxt, contract) ~init:balance
     ~f:(fun _cycle amount acc ->
         Lwt.return acc >>=? fun acc ->
-        Lwt.return (Tez_repr.(acc +? amount))) >>=? fun fees ->
+        Lwt.return (Tez_repr.(acc +? amount))) >>= fun balance ->
   Storage.Contract.Frozen_rewards.fold
     (ctxt, contract) ~init:balance
     ~f:(fun _cycle amount acc ->
         Lwt.return acc >>=? fun acc ->
-        Lwt.return (Tez_repr.(acc +? amount))) >>=? fun rewards ->
-  return { deposit ; fees ; rewards }
-
-let frozen_balance ctxt delegate =
-  frozen_balances ctxt delegate >>=? fun { deposit ; fees ; rewards } ->
-  Error_monad.fold_left_s (fun amount sum -> Lwt.return Tez_repr.(amount +? sum))
-    Tez_repr.zero
-    [deposit; fees; rewards] >>=
-  Lwt.return
+        Lwt.return (Tez_repr.(acc +? amount))) >>= fun balance ->
+  Lwt.return balance
 
 let full_balance ctxt delegate =
   let contract = Contract_repr.implicit_contract delegate in
   frozen_balance ctxt delegate >>=? fun frozen_balance ->
   Storage.Contract.Balance.get ctxt contract >>=? fun balance ->
   Lwt.return Tez_repr.(frozen_balance +? balance)
+
+let deactivated ctxt delegate =
+  let contract = Contract_repr.implicit_contract delegate in
+  Storage.Contract.Inactive_delegate.mem ctxt contract
+
+let grace_period ctxt delegate =
+  let contract = Contract_repr.implicit_contract delegate in
+  Storage.Contract.Delegate_desactivation.get ctxt contract
+
+let delegated_balance ctxt delegate =
+  let token_per_rolls = Constants_storage.tokens_per_roll ctxt in
+  Roll_storage.get_rolls ctxt delegate >>=? fun rolls ->
+  Roll_storage.get_change ctxt delegate >>=? fun change ->
+  let rolls = Int64.of_int (List.length rolls) in
+  Lwt.return Tez_repr.(token_per_rolls *? rolls) >>=? fun balance ->
+  Lwt.return Tez_repr.(balance +? change)
diff --git a/src/proto_alpha/lib_protocol/src/delegate_storage.mli b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
index 0577255ee..a8dfb3002 100644
--- a/src/proto_alpha/lib_protocol/src/delegate_storage.mli
+++ b/src/proto_alpha/lib_protocol/src/delegate_storage.mli
@@ -94,21 +94,27 @@ val has_frozen_balance:
   Raw_context.t -> Signature.Public_key_hash.t -> Cycle_repr.t ->
   bool tzresult Lwt.t
 
-(** Returns the amount of frozen tokens associated to a given key. *)
+(** Returns the amount of frozen deposit, fees and rewards associated
+    to a given delegate. *)
 val frozen_balance:
   Raw_context.t -> Signature.Public_key_hash.t ->
   Tez_repr.t tzresult Lwt.t
 
-type frozen_balances = {
+type frozen_balance = {
   deposit : Tez_repr.t ;
   fees : Tez_repr.t ;
   rewards : Tez_repr.t ;
 }
 
-(** Returns the amount of frozen deposit, fees and rewards associated to a given key. *)
+val frozen_balance_encoding: frozen_balance Data_encoding.t
+val frozen_balances_encoding: frozen_balance Cycle_repr.Map.t Data_encoding.t
+
+(** Returns the amount of frozen deposit, fees and rewards associated
+    to a given delegate, indexed by the cycle by which at the end the
+    balance will be unfrozen. *)
 val frozen_balances:
   Raw_context.t -> Signature.Public_key_hash.t ->
-  frozen_balances tzresult Lwt.t
+  frozen_balance Cycle_repr.Map.t Lwt.t
 
 (** Returns the full 'balance' of the implicit contract associated to
     a given key, i.e. the sum of the spendable balance and of the
@@ -116,3 +122,20 @@ val frozen_balances:
 val full_balance:
   Raw_context.t -> Signature.Public_key_hash.t ->
   Tez_repr.t tzresult Lwt.t
+
+(** Returns the list of contract that delegated towards a given delegate *)
+val get_delegated_contracts:
+  Raw_context.t -> Signature.Public_key_hash.t ->
+  Contract_hash.t list Lwt.t
+
+val delegated_balance:
+  Raw_context.t -> Signature.Public_key_hash.t ->
+  Tez_repr.t tzresult Lwt.t
+
+val deactivated:
+  Raw_context.t -> Signature.Public_key_hash.t ->
+  bool Lwt.t
+
+val grace_period:
+  Raw_context.t -> Signature.Public_key_hash.t ->
+  Cycle_repr.t tzresult Lwt.t
diff --git a/src/proto_alpha/lib_protocol/src/roll_repr.mli b/src/proto_alpha/lib_protocol/src/roll_repr.mli
index efbcde559..69035782a 100644
--- a/src/proto_alpha/lib_protocol/src/roll_repr.mli
+++ b/src/proto_alpha/lib_protocol/src/roll_repr.mli
@@ -7,7 +7,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
-type t
+type t = private int32
 type roll = t
 
 val encoding: roll Data_encoding.t
diff --git a/src/proto_alpha/lib_protocol/src/roll_storage.ml b/src/proto_alpha/lib_protocol/src/roll_storage.ml
index e0763d25f..15de1f2d7 100644
--- a/src/proto_alpha/lib_protocol/src/roll_storage.ml
+++ b/src/proto_alpha/lib_protocol/src/roll_storage.ml
@@ -131,6 +131,23 @@ let baking_rights_owner c level ~priority =
 let endorsement_rights_owner c level ~slot =
   Random.owner c "endorsement" level slot
 
+let traverse_rolls ctxt head =
+  let rec loop acc roll =
+    Storage.Roll.Successor.get_option ctxt roll >>=? function
+    | None -> return (List.rev acc)
+    | Some next -> loop (next :: acc) next in
+  loop [head] head
+
+let get_rolls ctxt delegate =
+  Storage.Roll.Delegate_roll_list.get_option ctxt delegate >>=? function
+  | None -> return []
+  | Some head_roll -> traverse_rolls ctxt head_roll
+
+let get_change c delegate =
+  Storage.Roll.Delegate_change.get_option c delegate >>=? function
+  | None -> return Tez_repr.zero
+  | Some change -> return change
+
 module Delegate = struct
 
   let fresh_roll c =
diff --git a/src/proto_alpha/lib_protocol/src/roll_storage.mli b/src/proto_alpha/lib_protocol/src/roll_storage.mli
index 6de338a1c..680b39b8e 100644
--- a/src/proto_alpha/lib_protocol/src/roll_storage.mli
+++ b/src/proto_alpha/lib_protocol/src/roll_storage.mli
@@ -70,6 +70,11 @@ val delegate_pubkey:
   Raw_context.t -> Signature.Public_key_hash.t ->
   Signature.Public_key.t tzresult Lwt.t
 
+val get_rolls:
+  Raw_context.t -> Signature.Public_key_hash.t -> Roll_repr.t list tzresult Lwt.t
+val get_change:
+  Raw_context.t -> Signature.Public_key_hash.t -> Tez_repr.t tzresult Lwt.t
+
 (**/**)
 
 val get_contract_delegate:
diff --git a/src/proto_alpha/lib_protocol/test/helpers/context.ml b/src/proto_alpha/lib_protocol/test/helpers/context.ml
index 5ae342546..80cf51f74 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/context.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/context.ml
@@ -97,16 +97,23 @@ module Contract = struct
           Alpha_services.Contract.balance rpc_ctxt ctxt contract
       | _ ->
           match Alpha_context.Contract.is_implicit contract with
-          | None -> invalid_arg "get_balance: no frozen accounts for an originated contract."
+          | None ->
+              invalid_arg
+                "get_balance: no frozen accounts for an originated contract."
           | Some pkh ->
-              Alpha_services.Delegate.frozen_balances rpc_ctxt ctxt pkh >>|?
-              fun Delegate.({deposit ; fees ; rewards }) ->
-              begin match kind with
-                | Deposit -> deposit
-                | Fees -> fees
-                | Rewards -> rewards
-                | _ -> invalid_arg "get_balance: pass Main, Deposit, Fees or Rewards."
-              end
+              Alpha_services.Delegate.frozen_balances
+                rpc_ctxt ctxt pkh >>=? fun map ->
+              Lwt.return @@
+              Cycle.Map.fold
+                (fun _cycle { Delegate.deposit ; fees ; rewards } acc ->
+                   acc >>?fun acc ->
+                   match kind with
+                   | Deposit -> Test_tez.Tez.(acc +? deposit)
+                   | Fees -> Test_tez.Tez.(acc +? fees)
+                   | Rewards ->  Test_tez.Tez.(acc +? rewards)
+                   | _ -> assert false)
+                map
+                (Ok Tez.zero)
     end
 
   let counter ctxt contract =