diff --git a/src/chain/index.ts b/src/chain/index.ts
index 125869af78a8..0eee2e5cbd71 100644
--- a/src/chain/index.ts
+++ b/src/chain/index.ts
@@ -2,7 +2,7 @@ import assert from "assert";
 import {EventEmitter} from "events";
 import {hashTreeRoot} from "@chainsafe/ssz";
 
-import {BeaconBlock, BeaconState, Deposit, Eth1Data, number64} from "../types";
+import {BeaconBlock, BeaconState, bytes48, Deposit, Epoch, Eth1Data, number64, Slot, ValidatorIndex} from "../types";
 import {GENESIS_SLOT, SECONDS_PER_SLOT} from "../constants";
 
 import {DB} from "../db";
diff --git a/src/rpc/api/validator/interface.ts b/src/rpc/api/validator/interface.ts
index 919c95fd7839..eb59abe8aed8 100644
--- a/src/rpc/api/validator/interface.ts
+++ b/src/rpc/api/validator/interface.ts
@@ -3,10 +3,11 @@
  */
 import {
   Attestation, AttestationData,
-  BeaconBlock, bytes, bytes32, bytes48, Fork, IndexedAttestation, number64, Shard, Slot, SyncingStatus, uint64,
-  ValidatorDuty
+  BeaconBlock, bytes, bytes32, bytes48, Epoch, Fork, IndexedAttestation, number64, Shard, Slot, SyncingStatus, uint64,
+  ValidatorDuty, ValidatorIndex
 } from "../../../types/index";
 import {IApi} from "../interface";
+import {CommitteeAssignment} from "../../../validator/types";
 
 export interface IValidatorApi extends IApi {
   /**
@@ -40,6 +41,21 @@ export interface IValidatorApi extends IApi {
    */
   getDuties(validatorPubkey: bytes48): Promise<{currentVersion: Fork; validatorDuty: ValidatorDuty}>;
 
+  /**
+   * Requests to check if a validator should propose for a given slot.
+   * @param {bytes48} validatorPubkey
+   * @param {Slot} slot
+   * @returns {Promise<{slot: Slot, proposer: boolean}}
+   */
+  isProposer(index: ValidatorIndex, slot: Slot): Promise<boolean>;
+
+  /**
+   * Requests a validators committeeAssignment, can be used for past, current and one epoch in the future
+   * @param {ValidatorIndex} index
+   * @param {Epoch} epoch
+   */
+  getCommitteeAssignment(index: ValidatorIndex, epoch: Epoch): Promise<CommitteeAssignment>;
+
   /**
    * Requests a BeaconNode to produce a valid block, which can then be signed by a ValidatorClient.
    * @param {Slot} slot
diff --git a/src/rpc/api/validator/validator.ts b/src/rpc/api/validator/validator.ts
index 3a60d705f18c..1bc94c8d573d 100644
--- a/src/rpc/api/validator/validator.ts
+++ b/src/rpc/api/validator/validator.ts
@@ -1,12 +1,14 @@
 import {
   Attestation, AttestationData, BeaconBlock, bytes32, Deposit, Shard, Slot, Eth1Data, uint64,
-  Fork, SyncingStatus, ValidatorDuty, bytes48, bytes, IndexedAttestation, number64, BeaconState
+  Fork, SyncingStatus, ValidatorDuty, bytes48, bytes, IndexedAttestation, number64, BeaconState, ValidatorIndex, Epoch
 } from "../../../types";
 import {DB} from "../../../db";
 import {BeaconChain} from "../../../chain";
 import {OpPool} from "../../../opPool";
 
 import {IValidatorApi} from "./interface";
+import {getCommitteeAssignment, isProposerAtSlot} from "../../../chain/stateTransition/util";
+import {CommitteeAssignment} from "../../../validator/types";
 
 export class ValidatorApi implements IValidatorApi {
   public namespace: string;
@@ -49,6 +51,16 @@ export class ValidatorApi implements IValidatorApi {
     return {} as BeaconBlock;
   }
 
+  public async isProposer(index: ValidatorIndex, slot: Slot): Promise<boolean> {
+    const state: BeaconState = await this.db.getState();
+    return isProposerAtSlot(state, slot, index);
+  }
+
+  public async getCommitteeAssignment(index: ValidatorIndex, epoch: Epoch): Promise<CommitteeAssignment> {
+    const state: BeaconState = await this.db.getState();
+    return getCommitteeAssignment(state, epoch, index);
+  }
+
   public async produceAttestation(slot: Slot, shard: Shard): Promise<AttestationData> {
     // eslint-disable-next-line @typescript-eslint/no-object-literal-type-assertion
     return {} as AttestationData;
diff --git a/test/utils/mocks/rpc/validator.ts b/test/utils/mocks/rpc/validator.ts
index 0ee4bf1f2996..4b0bd1b65943 100644
--- a/test/utils/mocks/rpc/validator.ts
+++ b/test/utils/mocks/rpc/validator.ts
@@ -1,9 +1,14 @@
-import {Attestation, AttestationData, BeaconBlock, bytes32, Deposit, Shard, Slot, Eth1Data} from "../../../../src/types";
+import {
+  Attestation, AttestationData, BeaconBlock, bytes32, Deposit, Shard, Slot, Eth1Data,
+  BeaconState, ValidatorIndex, Epoch
+} from "../../../../src/types";
 
 import {getEmptyBlock} from "../../../../src/chain/genesis";
 
 import {IValidatorApi} from "../../../../src/rpc/api/validator";
 import {bytes, bytes48, Fork, number64, SyncingStatus, uint64, ValidatorDuty} from "../../../../src/types";
+import {getCommitteeAssignment, isProposerAtSlot} from "../../../../src/chain/stateTransition/util";
+import {CommitteeAssignment} from "../../../../src/validator/types";
 
 export interface MockAPIOpts {
   head?: BeaconBlock;
@@ -64,6 +69,15 @@ export class MockValidatorApi implements IValidatorApi {
     return {} as AttestationData;
   }
 
+  public async isProposer(index: ValidatorIndex, slot: Slot): Promise<boolean> {
+    return true;
+  }
+
+  public async getCommitteeAssignment(index: ValidatorIndex, epoch: Epoch): Promise<CommitteeAssignment> {
+    // eslint-disable-next-line @typescript-eslint/no-object-literal-type-assertion
+    return {} as CommitteeAssignment;
+  }
+
   public async publishBlock(block: BeaconBlock): Promise<void> {
     this.head = block;
   }