diff --git a/.env.example b/.env.example
index 1fdd2432..7cfc33a6 100644
--- a/.env.example
+++ b/.env.example
@@ -1,2 +1,3 @@
 PRIVATE_KEY=
-BUNDLER_URL=https://bundler.biconomy.io/api/v2/80001/nJPK7B3ru.dd7f7861-190d-41bd-af80-6877f74b8f44
\ No newline at end of file
+BUNDLER_URL=
+PAYMASTER_URL=
\ No newline at end of file
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 65a1c364..e775712c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,7 +1,7 @@
 name: Build
 on:
   pull_request:
-
+    types: [opened, reopened, synchronize, ready_for_review]
 jobs:
   build:
     name: build
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 8c9b526a..d84ea290 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,6 +1,7 @@
 name: coverage
 on:
   pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
 jobs:
   coverage:
     name: coverage
@@ -15,4 +16,5 @@ jobs:
         run: bun run test:ci
         env:
           PRIVATE_KEY: ${{ secrets.PRIVATE_KEY }}
-          BUNDLER_URL: ${{ secrets.BUNDLER_URL }}
\ No newline at end of file
+          BUNDLER_URL: ${{ secrets.BUNDLER_URL }}
+          PAYMASTER_URL: ${{ secrets.PAYMASTER_URL }}
\ No newline at end of file
diff --git a/.github/workflows/pr-lint.yml b/.github/workflows/pr-lint.yml
index 5103ba2a..2d2ce5cb 100644
--- a/.github/workflows/pr-lint.yml
+++ b/.github/workflows/pr-lint.yml
@@ -1,6 +1,7 @@
 name: pr lint
 on:
   pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
 jobs:
   enforce_title:
     name: pr lint
diff --git a/.github/workflows/size-report.yml b/.github/workflows/size-report.yml
new file mode 100644
index 00000000..03eaa27b
--- /dev/null
+++ b/.github/workflows/size-report.yml
@@ -0,0 +1,27 @@
+name: size report
+on:
+  pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  size-report:
+    name: size report
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+
+      - name: Install dependencies
+        uses: ./.github/actions/install-dependencies
+
+      - name: Report bundle size
+        uses: andresz1/size-limit-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          package_manager: bun
\ No newline at end of file
diff --git a/.size-limit.json b/.size-limit.json
index b15afc33..01dd9552 100644
--- a/.size-limit.json
+++ b/.size-limit.json
@@ -11,9 +11,21 @@
     "limit": "10 kB"
   },
   {
-    "name": "core (tree-shaking)",
+    "name": "smartAccount (tree-shaking)",
     "path": "./dist/_esm/index.js",
     "limit": "5 kB",
     "import": "{ createSmartAccount }"
+  },
+  {
+    "name": "bundler (tree-shaking)",
+    "path": "./dist/_esm/bundler/index.js",
+    "limit": "5 kB",
+    "import": "{ createBundlerClient }"
+  },
+  {
+    "name": "paymaster (tree-shaking)",
+    "path": "./dist/_esm/paymaster/index.js",
+    "limit": "5 kB",
+    "import": "{ createPaymasterClient }"
   }
 ]
diff --git a/bun.lockb b/bun.lockb
index 0a917b11..83cd918c 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 87bb005d..694a5624 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "typings": "./dist/_types/index.d.ts",
   "homepage": "https://biconomy.io",
   "sideEffects": false,
-  "name": "@biconomy/core",
+  "name": "@biconomy/sdk",
   "author": "Biconomy",
   "version": "0.0.1",
   "description": "sdk for account abstraction, smart accounts, erc-4337 and erc-7579.",
@@ -54,7 +54,7 @@
     "build:cjs": "tsc --project ./tsconfig/tsconfig.cjs.json && tsc-alias -p ./tsconfig/tsconfig.cjs.json && echo > ./dist/_cjs/package.json '{\"type\":\"commonjs\"}'",
     "build:esm": "tsc --project ./tsconfig/tsconfig.esm.json && tsc-alias -p ./tsconfig/tsconfig.esm.json && echo > ./dist/_esm/package.json '{\"type\": \"module\",\"sideEffects\":false}'",
     "build:types": "tsc --project ./tsconfig/tsconfig.types.json && tsc-alias -p ./tsconfig/tsconfig.types.json",
-    "clean": "rimraf ./dist/_esm ./dist/_cjs ./dist/_types ./src/tsconfig",
+    "clean": "rimraf ./dist/_esm ./dist/_cjs ./dist/_types ./dist/tsconfig",
     "test": "vitest dev -c ./tests/vitest.config.ts",
     "test:ci": "CI=true vitest -c ./tests/vitest.config.ts --coverage",
     "size": "size-limit",
@@ -78,6 +78,7 @@
     "simple-git-hooks": "^2.9.0",
     "size-limit": "^11",
     "tsc-alias": "^1.8.8",
+    "tslib": "^2.6.2",
     "typedoc": "^0.25.9",
     "vitest": "^1.3.1"
   },
diff --git a/src/paymaster/actions/index.ts b/src/paymaster/actions/index.ts
new file mode 100644
index 00000000..b2e19593
--- /dev/null
+++ b/src/paymaster/actions/index.ts
@@ -0,0 +1,17 @@
+import { sponsorUserOperation } from "./sponsorUserOperation.js"
+
+export type PaymasterRpcSchema = [
+  {
+    Method: "eth_chainId"
+    Params: []
+    ReturnType: bigint
+  }
+]
+
+export type PaymasterActions = Record<
+  "sponsorUserOperation",
+  () => Promise<number>
+>
+export const paymasterActions = () => (): PaymasterActions => ({
+  sponsorUserOperation: () => sponsorUserOperation()
+})
diff --git a/src/paymaster/actions/sponsorUserOp.ts b/src/paymaster/actions/sponsorUserOp.ts
deleted file mode 100644
index e69de29b..00000000
diff --git a/src/paymaster/actions/sponsorUserOperation.ts b/src/paymaster/actions/sponsorUserOperation.ts
new file mode 100644
index 00000000..0c587cd2
--- /dev/null
+++ b/src/paymaster/actions/sponsorUserOperation.ts
@@ -0,0 +1,3 @@
+export const sponsorUserOperation = async () => {
+  return 1
+}
diff --git a/src/paymaster/createPaymasterClient.ts b/src/paymaster/createPaymasterClient.ts
index e69de29b..b68346f0 100644
--- a/src/paymaster/createPaymasterClient.ts
+++ b/src/paymaster/createPaymasterClient.ts
@@ -0,0 +1,56 @@
+import {
+  type Account,
+  type Chain,
+  type Client,
+  type PublicClientConfig,
+  type Transport,
+  createClient
+} from "viem"
+import {
+  type PaymasterActions,
+  type PaymasterRpcSchema,
+  paymasterActions
+} from "./actions"
+
+export type PaymasterClient<
+  TChain extends Chain | undefined = Chain | undefined
+> = Client<
+  Transport,
+  TChain,
+  Account | undefined,
+  PaymasterRpcSchema,
+  PaymasterActions
+>
+
+/**
+ * Creates a Paymaster Client with a given [Transport](https://viem.sh/docs/clients/intro.html) configured for a [Chain](https://viem.sh/docs/clients/chains.html).
+ *
+ * A Paymaster Client is an interface to "paymaster endpoints" [JSON-RPC API](https://docs..io/reference/verifying-paymaster/endpoints) methods such as sponsoring user operation, etc through Paymaster Actions.
+ *
+ * @param config - {@link PublicClientConfig}
+ * @returns A  Paymaster Client. {@link PaymasterClient}
+ *
+ * @example
+ * import { createPublicClient, http } from 'viem'
+ * import { polygonMumbai } from 'viem/chains'
+ *
+ * const PaymasterClient = createPaymasterClient({
+ *   chain: polygonMumbai,
+ *   transport: http("https://paymaster.biconomy.io/api/v1/80001/YOUR_API_KEY_HERE"),
+ * })
+ */
+export const createPaymasterClient = <
+  transport extends Transport = Transport,
+  chain extends Chain | undefined = undefined
+>(
+  parameters: PublicClientConfig<transport, chain>
+): PaymasterClient => {
+  const { key = "public", name = "Paymaster Client" } = parameters
+  const client = createClient({
+    ...parameters,
+    key,
+    name,
+    type: "PaymasterClient"
+  })
+  return client.extend(paymasterActions())
+}
diff --git a/src/paymaster/index.ts b/src/paymaster/index.ts
new file mode 100644
index 00000000..70417b0e
--- /dev/null
+++ b/src/paymaster/index.ts
@@ -0,0 +1,3 @@
+export type { PaymasterRpcSchema, PaymasterActions } from "./actions/index.js"
+export { paymasterActions } from "./actions/index.js"
+export { createPaymasterClient } from "./createPaymasterClient.js"
diff --git a/src/paymaster/utils/helpers.ts b/src/paymaster/utils/helpers.ts
new file mode 100644
index 00000000..cf72437d
--- /dev/null
+++ b/src/paymaster/utils/helpers.ts
@@ -0,0 +1,18 @@
+/**
+ * Extracts the chain ID from a paymaster URL.
+ * @param url - The bundler URL.
+ * @returns The extracted chain ID.
+ * @throws Error if the chain ID cannot be extracted or is invalid.
+ */
+export const extractChainIdFromPaymasterUrl = (url: string): number => {
+  try {
+    const regex = /\/api\/v\d+\/(\d+)\//
+    const match = regex.exec(url)
+    if (!match) {
+      throw new Error("Invalid URL format")
+    }
+    return Number.parseInt(match[1])
+  } catch (error) {
+    throw new Error("Invalid chain id")
+  }
+}
diff --git a/tests/account.test.ts b/tests/account.test.ts
index 0a6b9a46..810a46f3 100644
--- a/tests/account.test.ts
+++ b/tests/account.test.ts
@@ -64,10 +64,8 @@ describe("Biconomy Smart Account core tests", () => {
 
   test("Should get account address + nonce", async () => {
     const address = smartAccount.address
-    console.log("Smart Account Address: ", address)
-
     const nonce = await smartAccount.getNonce()
-    console.log("Smart Account Nonce: ", nonce)
+    expect(address).toBeTypeOf("string")
   })
 
   test("Should sign a user operation", async () => {
diff --git a/tests/paymaster.test.ts b/tests/paymaster.test.ts
new file mode 100644
index 00000000..8205ff13
--- /dev/null
+++ b/tests/paymaster.test.ts
@@ -0,0 +1,33 @@
+import { http } from "viem"
+import { describe, expect, it } from "vitest"
+
+import { privateKeyToAccount } from "viem/accounts"
+import { getChain } from "../src/account/utils/helpers.js"
+import { createPaymasterClient } from "../src/paymaster/createPaymasterClient.js"
+import { extractChainIdFromPaymasterUrl } from "../src/paymaster/utils/helpers.js"
+
+describe("Paymaster tests", () => {
+  const paymasterUrl = process.env.PAYMASTER_URL ?? ""
+  const chainId = extractChainIdFromPaymasterUrl(paymasterUrl)
+  const chain = getChain(chainId)
+  const account = privateKeyToAccount(`0x${process.env.PRIVATE_KEY}`)
+
+  it("Should have the properties of a viem client", async () => {
+    const paymasterClient = createPaymasterClient({
+      chain,
+      transport: http(paymasterUrl)
+    })
+    expect(paymasterClient.uid).toBeDefined()
+    expect(paymasterClient?.chain?.id).toBe(chainId)
+    expect(paymasterClient.pollingInterval).toBeDefined()
+  })
+
+  it("Should have a paymaster specific action", async () => {
+    const paymasterClient = createPaymasterClient({
+      chain,
+      transport: http(paymasterUrl)
+    })
+    const result = await paymasterClient.sponsorUserOperation()
+    expect(result).toBeTruthy()
+  })
+})
diff --git a/tests/utils.ts b/tests/utils.ts
index dc971c54..84983283 100644
--- a/tests/utils.ts
+++ b/tests/utils.ts
@@ -1,5 +1,5 @@
 export const envCheck = () => {
-  const fields = ["BUNDLER_URL", "PRIVATE_KEY"]
+  const fields = ["BUNDLER_URL", "PRIVATE_KEY", "PAYMASTER_URL"]
   const errorFields = fields.filter((field) => !process.env[field])
   if (errorFields.length) {
     throw new Error(