diff --git a/packages/celotool/src/e2e-tests/transfer_tests.ts b/packages/celotool/src/e2e-tests/transfer_tests.ts
index 37e3eabe1dc..3d22ddef327 100644
--- a/packages/celotool/src/e2e-tests/transfer_tests.ts
+++ b/packages/celotool/src/e2e-tests/transfer_tests.ts
@@ -1,3 +1,6 @@
+// tslint:disable-next-line: no-reference (Required to make this work w/ ts-node)
+/// <reference path="../../../contractkit/types/web3.d.ts" />
+
 import { CeloContract, CeloToken, ContractKit, newKit, newKitFromWeb3 } from '@celo/contractkit'
 import { TransactionResult } from '@celo/contractkit/lib/utils/tx-result'
 import { toFixed } from '@celo/utils/lib/fixidity'
diff --git a/packages/celotool/tsconfig.json b/packages/celotool/tsconfig.json
index 83264d28d8a..f1e65a88714 100644
--- a/packages/celotool/tsconfig.json
+++ b/packages/celotool/tsconfig.json
@@ -13,7 +13,7 @@
       "@google-cloud/monitoring": ["types/monitoring"]
     }
   },
-  "include": ["src/"],
+  "include": ["src", "../contractkit/types"],
   "exclude": ["node_modules/"],
-  "references": [{ "path": "../utils" }]
+  "references": [{ "path": "../utils" }, { "path": "../contractkit" }]
 }
diff --git a/packages/cli/src/commands/validatorgroup/member.ts b/packages/cli/src/commands/validatorgroup/member.ts
index 6798baeaf76..be60216c69a 100644
--- a/packages/cli/src/commands/validatorgroup/member.ts
+++ b/packages/cli/src/commands/validatorgroup/member.ts
@@ -11,13 +11,17 @@ export default class ValidatorGroupRegister extends BaseCommand {
     ...BaseCommand.flags,
     from: Flags.address({ required: true, description: "ValidatorGroup's address" }),
     accept: flags.boolean({
-      exclusive: ['remove'],
+      exclusive: ['remove', 'reorder'],
       description: 'Accept a validator whose affiliation is already set to the group',
     }),
     remove: flags.boolean({
-      exclusive: ['accept'],
+      exclusive: ['accept', 'reorder'],
       description: 'Remove a validator from the members list',
     }),
+    reorder: flags.integer({
+      exclusive: ['accept', 'remove'],
+      description: 'Reorder a validator within the members list',
+    }),
   }
 
   static args: IArg[] = [Args.address('validatorAddress', { description: "Validator's address" })]
@@ -25,13 +29,14 @@ export default class ValidatorGroupRegister extends BaseCommand {
   static examples = [
     'member --accept 0x97f7333c51897469e8d98e7af8653aab468050a3 ',
     'member --remove 0x47e172f6cfb6c7d01c1574fa3e2be7cc73269d95',
+    'member --reorder 3 0x47e172f6cfb6c7d01c1574fa3e2be7cc73269d95',
   ]
 
   async run() {
     const res = this.parse(ValidatorGroupRegister)
 
-    if (!(res.flags.accept || res.flags.remove)) {
-      this.error(`Specify action: --accept or --remove`)
+    if (!(res.flags.accept || res.flags.remove || res.flags.reorder)) {
+      this.error(`Specify action: --accept, --remove or --reorder`)
       return
     }
 
@@ -40,8 +45,20 @@ export default class ValidatorGroupRegister extends BaseCommand {
 
     if (res.flags.accept) {
       await displaySendTx('addMember', validators.addMember((res.args as any).validatorAddress))
-    } else {
-      await displaySendTx('addMember', validators.removeMember((res.args as any).validatorAddress))
+    } else if (res.flags.remove) {
+      await displaySendTx(
+        'removeMember',
+        validators.removeMember((res.args as any).validatorAddress)
+      )
+    } else if (res.flags.reorder != null) {
+      await displaySendTx(
+        'reorderMember',
+        await validators.reorderMember(
+          res.flags.from,
+          (res.args as any).validatorAddress,
+          res.flags.reorder
+        )
+      )
     }
   }
 }
diff --git a/packages/cli/src/utils/cli.ts b/packages/cli/src/utils/cli.ts
index 4102c94ef7d..f97160513e6 100644
--- a/packages/cli/src/utils/cli.ts
+++ b/packages/cli/src/utils/cli.ts
@@ -5,7 +5,11 @@ import Table from 'cli-table'
 import { cli } from 'cli-ux'
 import { Tx } from 'web3/eth/types'
 
-export async function displaySendTx<A>(name: string, txObj: CeloTransactionObject<A>, tx?: Tx) {
+export async function displaySendTx<A>(
+  name: string,
+  txObj: CeloTransactionObject<A>,
+  tx?: Omit<Tx, 'data'>
+) {
   cli.action.start(`Sending Transaction: ${name}`)
   const txResult = await txObj.send(tx)
 
diff --git a/packages/cli/tsconfig.json b/packages/cli/tsconfig.json
index 6b49fb45662..cfe287bd5a9 100644
--- a/packages/cli/tsconfig.json
+++ b/packages/cli/tsconfig.json
@@ -6,6 +6,6 @@
     "esModuleInterop": true,
     "target": "es6"
   },
-  "include": ["src"],
-  "references": [{ "path": "../utils" }]
+  "include": ["src", "../contractkit/types"],
+  "references": [{ "path": "../utils" }, { "path": "../contractkit" }]
 }
diff --git a/packages/contractkit/src/wrappers/Attestations.ts b/packages/contractkit/src/wrappers/Attestations.ts
index 03fa7040ce9..270b53bf5ce 100644
--- a/packages/contractkit/src/wrappers/Attestations.ts
+++ b/packages/contractkit/src/wrappers/Attestations.ts
@@ -10,8 +10,8 @@ import {
   proxySend,
   toBigNumber,
   toNumber,
+  toTransactionObject,
   tupleParser,
-  wrapSend,
 } from './BaseWrapper'
 const parseSignature = SignatureUtils.parseSignature
 
@@ -206,7 +206,7 @@ export class AttestationsWrapper extends BaseWrapper<Attestations> {
     const phoneHash = PhoneNumberUtils.getPhoneHash(phoneNumber)
     const expectedSourceMessage = attestationMessageToSign(phoneHash, account)
     const { r, s, v } = parseSignature(expectedSourceMessage, code, issuer.toLowerCase())
-    return wrapSend(this.kit, this.contract.methods.complete(phoneHash, v, r, s))
+    return toTransactionObject(this.kit, this.contract.methods.complete(phoneHash, v, r, s))
   }
 
   /**
@@ -305,7 +305,7 @@ export class AttestationsWrapper extends BaseWrapper<Attestations> {
   async request(phoneNumber: string, attestationsRequested: number, token: CeloToken) {
     const phoneHash = PhoneNumberUtils.getPhoneHash(phoneNumber)
     const tokenAddress = await this.kit.registry.addressFor(token)
-    return wrapSend(
+    return toTransactionObject(
       this.kit,
       this.contract.methods.request(phoneHash, attestationsRequested, tokenAddress)
     )
@@ -332,7 +332,7 @@ export class AttestationsWrapper extends BaseWrapper<Attestations> {
         Buffer.from(phoneNumber, 'utf8')
       ).toString('hex')
 
-    return wrapSend(
+    return toTransactionObject(
       this.kit,
       this.contract.methods.reveal(
         PhoneNumberUtils.getPhoneHash(phoneNumber),
diff --git a/packages/contractkit/src/wrappers/BaseWrapper.ts b/packages/contractkit/src/wrappers/BaseWrapper.ts
index 8da2ff80fb9..5b1f624ac78 100644
--- a/packages/contractkit/src/wrappers/BaseWrapper.ts
+++ b/packages/contractkit/src/wrappers/BaseWrapper.ts
@@ -22,15 +22,6 @@ export abstract class BaseWrapper<T extends Contract> {
   }
 }
 
-export interface CeloTransactionObject<O> {
-  /** web3 native TransactionObject. Normally not used */
-  txo: TransactionObject<O>
-  /** send the transaction to the chain */
-  send(params?: Omit<Tx, 'data'>): Promise<TransactionResult>
-  /** send the transaction and waits for the receipt */
-  sendAndWaitForReceipt(params?: Omit<Tx, 'data'>): Promise<TransactionReceipt>
-}
-
 /** Parse string -> BigNumber */
 export function toBigNumber(input: string) {
   return new BigNumber(input)
@@ -205,18 +196,34 @@ export function proxySend<InputArgs extends any[], ParsedInputArgs extends any[]
   if (sendArgs.length === 2) {
     const methodFn = sendArgs[0]
     const preParse = sendArgs[1]
-    return (...args: InputArgs) => wrapSend(kit, methodFn(...preParse(...args)))
+    return (...args: InputArgs) => toTransactionObject(kit, methodFn(...preParse(...args)))
   } else {
     const methodFn = sendArgs[0]
-    return (...args: InputArgs) => wrapSend(kit, methodFn(...args))
+    return (...args: InputArgs) => toTransactionObject(kit, methodFn(...args))
   }
 }
 
-export function wrapSend<O>(kit: ContractKit, txo: TransactionObject<O>): CeloTransactionObject<O> {
-  return {
-    send: (params?: Omit<Tx, 'data'>) => kit.sendTransactionObject(txo, params),
-    txo,
-    sendAndWaitForReceipt: (params?: Omit<Tx, 'data'>) =>
-      kit.sendTransactionObject(txo, params).then((result) => result.waitReceipt()),
+export function toTransactionObject<O>(
+  kit: ContractKit,
+  txo: TransactionObject<O>,
+  defaultParams?: Omit<Tx, 'data'>
+): CeloTransactionObject<O> {
+  return new CeloTransactionObject(kit, txo, defaultParams)
+}
+
+export class CeloTransactionObject<O> {
+  constructor(
+    private kit: ContractKit,
+    readonly txo: TransactionObject<O>,
+    readonly defaultParams?: Omit<Tx, 'data'>
+  ) {}
+
+  /** send the transaction to the chain */
+  send = (params?: Omit<Tx, 'data'>): Promise<TransactionResult> => {
+    return this.kit.sendTransactionObject(this.txo, { ...this.defaultParams, ...params })
   }
+
+  /** send the transaction and waits for the receipt */
+  sendAndWaitForReceipt = (params?: Omit<Tx, 'data'>): Promise<TransactionReceipt> =>
+    this.send(params).then((result) => result.waitReceipt())
 }
diff --git a/packages/contractkit/src/wrappers/LockedGold.ts b/packages/contractkit/src/wrappers/LockedGold.ts
index 87ee8c46df4..c87519a965c 100644
--- a/packages/contractkit/src/wrappers/LockedGold.ts
+++ b/packages/contractkit/src/wrappers/LockedGold.ts
@@ -10,7 +10,7 @@ import {
   proxyCall,
   proxySend,
   toBigNumber,
-  wrapSend,
+  toTransactionObject,
 } from '../wrappers/BaseWrapper'
 
 export interface VotingDetails {
@@ -117,6 +117,21 @@ export class LockedGoldWrapper extends BaseWrapper<LockedGold> {
    */
   isVoting = proxyCall(this.contract.methods.isVoting)
 
+  /**
+   * Check if an account already exists.
+   * @param account The address of the account
+   * @return Returns `true` if account exists. Returns `false` otherwise.
+   *         In particular it will return `false` if a delegate with given address exists.
+   */
+  isAccount = proxyCall(this.contract.methods.isAccount)
+
+  /**
+   * Check if a delegate already exists.
+   * @param account The address of the delegate
+   * @return Returns `true` if delegate exists. Returns `false` otherwise.
+   */
+  isDelegate = proxyCall(this.contract.methods.isDelegate)
+
   /**
    * Query maximum notice period.
    * @returns Current maximum notice period.
@@ -226,7 +241,7 @@ export class LockedGoldWrapper extends BaseWrapper<LockedGold> {
     role: Roles
   ): Promise<CeloTransactionObject<void>> {
     const sig = await this.getParsedSignatureOfAddress(account, delegate)
-    return wrapSend(
+    return toTransactionObject(
       this.kit,
       this.contract.methods.delegateRole(role, delegate, sig.v, sig.r, sig.s)
     )
diff --git a/packages/contractkit/src/wrappers/Validators.test.ts b/packages/contractkit/src/wrappers/Validators.test.ts
new file mode 100644
index 00000000000..3d5c831e6e3
--- /dev/null
+++ b/packages/contractkit/src/wrappers/Validators.test.ts
@@ -0,0 +1,139 @@
+import Web3 from 'web3'
+import { newKitFromWeb3 } from '../kit'
+import { testWithGanache } from '../test-utils/ganache-test'
+import { LockedGoldWrapper } from './LockedGold'
+import { ValidatorsWrapper } from './Validators'
+
+/*
+TEST NOTES:
+- In migrations: The only account that has cUSD is accounts[0]
+*/
+
+const minLockedGoldValue = Web3.utils.toWei('100', 'ether') // 1 gold
+const minLockedGoldNoticePeriod = 120 * 24 * 60 * 60 // 120 days
+
+// A random 64 byte hex string.
+const publicKey =
+  'ea0733ad275e2b9e05541341a97ee82678c58932464fad26164657a111a7e37a9fa0300266fb90e2135a1f1512350cb4e985488a88809b14e3cbe415e76e82b2'
+const blsPublicKey =
+  '4d23d8cd06f30b1fa7cf368e2f5399ab04bb6846c682f493a98a607d3dfb7e53a712bb79b475c57b0ac2785460f91301'
+const blsPoP =
+  '9d3e1d8f49f6b0d8e9a03d80ca07b1d24cf1cc0557bdcc04f5e17a46e35d02d0d411d956dbd5d2d2464eebd7b74ae30005d223780d785d2abc5644fac7ac29fb0e302bdc80c81a5d45018b68b1045068a4b3a4861c93037685fd0d252d740501'
+
+const publicKeysData = '0x' + publicKey + blsPublicKey + blsPoP
+
+testWithGanache('Validators Wrapper', (web3) => {
+  const kit = newKitFromWeb3(web3)
+  let accounts: string[] = []
+  let validators: ValidatorsWrapper
+  let lockedGold: LockedGoldWrapper
+
+  const registerAccountWithCommitment = async (account: string) => {
+    // console.log('isAccount', )
+    // console.log('isDelegate', await lockedGold.isDelegate(account))
+
+    if (!(await lockedGold.isAccount(account))) {
+      await lockedGold.createAccount().sendAndWaitForReceipt({ from: account })
+    }
+    await lockedGold
+      .newCommitment(minLockedGoldNoticePeriod)
+      .sendAndWaitForReceipt({ from: account, value: minLockedGoldValue })
+  }
+
+  beforeAll(async () => {
+    accounts = await web3.eth.getAccounts()
+    validators = await kit.contracts.getValidators()
+    lockedGold = await kit.contracts.getLockedGold()
+  })
+
+  const setupGroup = async (groupAccount: string) => {
+    await registerAccountWithCommitment(groupAccount)
+    await validators
+      .registerValidatorGroup('thegroup', 'The Group', 'thegroup.com', [minLockedGoldNoticePeriod])
+      .sendAndWaitForReceipt({ from: groupAccount })
+  }
+
+  const setupValidator = async (validatorAccount: string) => {
+    await registerAccountWithCommitment(validatorAccount)
+    // set account1 as the validator
+    await validators
+      .registerValidator(
+        'goodoldvalidator',
+        'Good old validator',
+        'goodold.com',
+        // @ts-ignore
+        publicKeysData,
+        [minLockedGoldNoticePeriod]
+      )
+      .sendAndWaitForReceipt({ from: validatorAccount })
+  }
+
+  test('SBAT registerValidatorGroup', async () => {
+    const groupAccount = accounts[0]
+    await setupGroup(groupAccount)
+    await expect(validators.isValidatorGroup(groupAccount)).resolves.toBe(true)
+  })
+
+  test('SBAT registerValidator', async () => {
+    const validatorAccount = accounts[1]
+    await setupValidator(validatorAccount)
+    await expect(validators.isValidator(validatorAccount)).resolves.toBe(true)
+  })
+
+  test('SBAT addMember', async () => {
+    const groupAccount = accounts[0]
+    const validatorAccount = accounts[1]
+    await setupGroup(groupAccount)
+    await setupValidator(validatorAccount)
+    await validators.affiliate(groupAccount).sendAndWaitForReceipt({ from: validatorAccount })
+    await validators.addMember(validatorAccount).sendAndWaitForReceipt({ from: groupAccount })
+
+    const members = await validators.getValidatorGroup(groupAccount).then((group) => group.members)
+    expect(members).toContain(validatorAccount)
+  })
+
+  describe('SBAT reorderMember', () => {
+    let groupAccount: string, validator1: string, validator2: string
+
+    beforeEach(async () => {
+      groupAccount = accounts[0]
+      await setupGroup(groupAccount)
+
+      validator1 = accounts[1]
+      validator2 = accounts[2]
+
+      for (const validator of [validator1, validator2]) {
+        await setupValidator(validator)
+        await validators.affiliate(groupAccount).sendAndWaitForReceipt({ from: validator })
+        await validators.addMember(validator).sendAndWaitForReceipt({ from: groupAccount })
+      }
+
+      const members = await validators
+        .getValidatorGroup(groupAccount)
+        .then((group) => group.members)
+      expect(members).toEqual([validator1, validator2])
+    })
+
+    test('move last to first', async () => {
+      await validators
+        .reorderMember(groupAccount, validator2, 0)
+        .then((x) => x.sendAndWaitForReceipt())
+
+      const membersAfter = await validators
+        .getValidatorGroup(groupAccount)
+        .then((group) => group.members)
+      expect(membersAfter).toEqual([validator2, validator1])
+    })
+
+    test('move first to last', async () => {
+      await validators
+        .reorderMember(groupAccount, validator1, 1)
+        .then((x) => x.sendAndWaitForReceipt())
+
+      const membersAfter = await validators
+        .getValidatorGroup(groupAccount)
+        .then((group) => group.members)
+      expect(membersAfter).toEqual([validator2, validator1])
+    })
+  })
+})
diff --git a/packages/contractkit/src/wrappers/Validators.ts b/packages/contractkit/src/wrappers/Validators.ts
index fe9ae06f560..2ebe2859f61 100644
--- a/packages/contractkit/src/wrappers/Validators.ts
+++ b/packages/contractkit/src/wrappers/Validators.ts
@@ -10,7 +10,7 @@ import {
   proxySend,
   toBigNumber,
   toNumber,
-  wrapSend,
+  toTransactionObject,
 } from './BaseWrapper'
 
 export interface Validator {
@@ -53,8 +53,6 @@ export interface ValidatorConfig {
 export class ValidatorsWrapper extends BaseWrapper<Validators> {
   affiliate = proxySend(this.kit, this.contract.methods.affiliate)
   deaffiliate = proxySend(this.kit, this.contract.methods.deaffiliate)
-  addMember = proxySend(this.kit, this.contract.methods.addMember)
-  removeMember = proxySend(this.kit, this.contract.methods.removeMember)
   registerValidator = proxySend(this.kit, this.contract.methods.registerValidator)
   registerValidatorGroup = proxySend(this.kit, this.contract.methods.registerValidatorGroup)
   /**
@@ -151,6 +149,76 @@ export class ValidatorsWrapper extends BaseWrapper<Validators> {
     }
   }
 
+  /**
+   * Returns whether a particular account is voting for a validator group.
+   * @param account The account.
+   * @return Whether a particular account is voting for a validator group.
+   */
+  isVoting = proxyCall(this.contract.methods.isVoting)
+
+  /**
+   * Returns whether a particular account is a registered validator or validator group.
+   * @param account The account.
+   * @return Whether a particular account is a registered validator or validator group.
+   */
+  isValidating = proxyCall(this.contract.methods.isValidating)
+
+  /**
+   * Returns whether a particular account has a registered validator.
+   * @param account The account.
+   * @return Whether a particular address is a registered validator.
+   */
+  isValidator = proxyCall(this.contract.methods.isValidator)
+
+  /**
+   * Returns whether a particular account has a registered validator group.
+   * @param account The account.
+   * @return Whether a particular address is a registered validator group.
+   */
+  isValidatorGroup = proxyCall(this.contract.methods.isValidatorGroup)
+
+  /**
+   * Returns whether an account meets the requirements to register a validator or group.
+   * @param account The account.
+   * @param noticePeriods An array of notice periods of the Locked Gold commitments
+   *   that cumulatively meet the requirements for validator registration.
+   * @return Whether an account meets the requirements to register a validator or group.
+   */
+  meetsRegistrationRequirements = proxyCall(this.contract.methods.meetsRegistrationRequirements)
+
+  addMember = proxySend(this.kit, this.contract.methods.addMember)
+  removeMember = proxySend(this.kit, this.contract.methods.removeMember)
+
+  async reorderMember(groupAddr: Address, validator: Address, newIndex: number) {
+    const group = await this.getValidatorGroup(groupAddr)
+
+    if (newIndex < 0 || newIndex >= group.members.length) {
+      throw new Error(`Invalid index ${newIndex}; max index is ${group.members.length - 1}`)
+    }
+
+    const currentIdx = group.members.indexOf(validator)
+    if (currentIdx < 0) {
+      throw new Error(`ValidatorGroup ${groupAddr} does not inclue ${validator}`)
+    } else if (currentIdx === newIndex) {
+      throw new Error(`Validator is already in position ${newIndex}`)
+    }
+
+    // remove the element
+    group.members.splice(currentIdx, 1)
+    // add it on new position
+    group.members.splice(newIndex, 0, validator)
+
+    const nextMember =
+      newIndex === group.members.length - 1 ? NULL_ADDRESS : group.members[newIndex + 1]
+    const prevMember = newIndex === 0 ? NULL_ADDRESS : group.members[newIndex - 1]
+
+    return toTransactionObject(
+      this.kit,
+      this.contract.methods.reorderMember(validator, nextMember, prevMember),
+      { from: groupAddr }
+    )
+  }
+
   async getRegisteredValidatorGroups(): Promise<ValidatorGroup[]> {
     const vgAddresses = await this.contract.methods.getRegisteredValidatorGroups().call()
     return Promise.all(vgAddresses.map((addr) => this.getValidatorGroup(addr)))
@@ -191,7 +259,7 @@ export class ValidatorsWrapper extends BaseWrapper<Validators> {
       votingDetails.weight.negated()
     )
 
-    return wrapSend(this.kit, this.contract.methods.revokeVote(lesser, greater))
+    return toTransactionObject(this.kit, this.contract.methods.revokeVote(lesser, greater))
   }
 
   async vote(validatorGroup: Address): Promise<CeloTransactionObject<boolean>> {
@@ -207,7 +275,10 @@ export class ValidatorsWrapper extends BaseWrapper<Validators> {
       votingDetails.weight
     )
 
-    return wrapSend(this.kit, this.contract.methods.vote(validatorGroup, lesser, greater))
+    return toTransactionObject(
+      this.kit,
+      this.contract.methods.vote(validatorGroup, lesser, greater)
+    )
   }
 
   private async findLesserAndGreaterAfterVote(
diff --git a/packages/docs/command-line-interface/validatorgroup.md b/packages/docs/command-line-interface/validatorgroup.md
index f8e3eda5b7b..95186d3bfca 100644
--- a/packages/docs/command-line-interface/validatorgroup.md
+++ b/packages/docs/command-line-interface/validatorgroup.md
@@ -33,10 +33,12 @@ OPTIONS
   --accept                                           Accept a validator whose affiliation is already set to the group
   --from=0xc1912fEE45d61C87Cc5EA59DaE31190FFFFf232d  (required) ValidatorGroup's address
   --remove                                           Remove a validator from the members list
+  --reorder=reorder                                  Reorder a validator within the members list
 
 EXAMPLES
   member --accept 0x97f7333c51897469e8d98e7af8653aab468050a3
   member --remove 0x47e172f6cfb6c7d01c1574fa3e2be7cc73269d95
+  member --reorder 3 0x47e172f6cfb6c7d01c1574fa3e2be7cc73269d95
 ```
 
 _See code: [packages/cli/src/commands/validatorgroup/member.ts](https://github.com/celo-org/celo-monorepo/tree/master/packages/cli/src/commands/validatorgroup/member.ts)_