diff --git a/package-lock.json b/package-lock.json
index f368f26..b11a6b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@fileverse/crypto",
-  "version": "0.0.19",
+  "version": "0.0.19-viem-1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@fileverse/crypto",
-      "version": "0.0.19",
+      "version": "0.0.19-viem-1",
       "license": "ISC",
       "dependencies": {
         "@noble/ciphers": "^2.1.1",
@@ -21,14 +21,25 @@
         "@vitest/ui": "^3.1.2",
         "terser": "^5.28.1",
         "typescript": "^5.8.3",
+        "viem": "^2.13.8",
         "vite": "^6.3.3",
         "vite-plugin-dts": "^4.5.3",
         "vitest": "^3.1.2"
       },
       "engines": {
         "node": ">=16.0.0"
+      },
+      "peerDependencies": {
+        "viem": "^2.13.8"
       }
     },
+    "node_modules/@adraffy/ens-normalize": {
+      "version": "1.11.1",
+      "resolved": "https://registry.npmjs.org/@adraffy/ens-normalize/-/ens-normalize-1.11.1.tgz",
+      "integrity": "sha512-nhCBV3quEgesuf7c7KYfperqSS14T8bYuvJ8PcLJp6znkZpFc0AuW4qBtr8eKVyPPe/8RSr7sglCWPU5eaxwKQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@babel/helper-string-parser": {
       "version": "7.25.9",
       "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.9.tgz",
@@ -1112,6 +1123,87 @@
         "string-argv": "~0.3.1"
       }
     },
+    "node_modules/@scure/base": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.2.6.tgz",
+      "integrity": "sha512-g/nm5FgUa//MCj1gV09zTJTaM6KBAHqLN907YVQqf7zC49+DcO4B1so4ZX07Ef10Twr6nuqYEH9GEggFXA4Fmg==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip32": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip32/-/bip32-1.7.0.tgz",
+      "integrity": "sha512-E4FFX/N3f4B80AKWp5dP6ow+flD1LQZo/w8UnLGYZO674jS6YnYeepycOOksv+vLPSpgN35wgKgy+ybfTb2SMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/curves": "~1.9.0",
+        "@noble/hashes": "~1.8.0",
+        "@scure/base": "~1.2.5"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip32/node_modules/@noble/curves": {
+      "version": "1.9.7",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.9.7.tgz",
+      "integrity": "sha512-gbKGcRUYIjA3/zCCNaWDciTMFI0dCkvou3TL8Zmy5Nc7sJ47a0jtOeZoTaMxkuqRo9cRhjOdZJXegxYE5FN/xw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "1.8.0"
+      },
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip32/node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip39": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@scure/bip39/-/bip39-1.6.0.tgz",
+      "integrity": "sha512-+lF0BbLiJNwVlev4eKelw1WWLaiKXw7sSl8T6FvBlWkdX+94aGJ4o8XjUdlyhTCjd8c+B3KT3JfS8P0bLRNU6A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "~1.8.0",
+        "@scure/base": "~1.2.5"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip39/node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
     "node_modules/@types/argparse": {
       "version": "1.0.38",
       "resolved": "https://registry.npmjs.org/@types/argparse/-/argparse-1.0.38.tgz",
@@ -1404,6 +1496,28 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/abitype": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/abitype/-/abitype-1.2.3.tgz",
+      "integrity": "sha512-Ofer5QUnuUdTFsBRwARMoWKOH1ND5ehwYhJ3OJ/BQO+StkwQjHw0XyVh4vDttzHB7QOFhPHa/o413PJ82gU/Tg==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/wevm"
+      },
+      "peerDependencies": {
+        "typescript": ">=5.0.4",
+        "zod": "^3.22.0 || ^4.0.0"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/acorn": {
       "version": "8.14.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.14.1.tgz",
@@ -1701,6 +1815,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/eventemitter3": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-5.0.1.tgz",
+      "integrity": "sha512-GWkBvjiSZK87ELrYOSESUYeVIc9mvLLf/nXalMOS5dYrgZq9o5OVkbZAVM06CVxYsCwH9BDZFPlQTlPA1j4ahA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/expect-type": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.2.1.tgz",
@@ -1860,6 +1981,22 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/isows": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/isows/-/isows-1.0.7.tgz",
+      "integrity": "sha512-I1fSfDCZL5P0v33sVqeTDSpcstAg/N+wF5HS033mogOVIp4B+oHC7oOCsA3axAbBSGTJ8QubbNmnIRN/h8U7hg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/wevm"
+        }
+      ],
+      "license": "MIT",
+      "peerDependencies": {
+        "ws": "*"
+      }
+    },
     "node_modules/jju": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/jju/-/jju-1.4.0.tgz",
@@ -2043,6 +2180,79 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/ox": {
+      "version": "0.14.20",
+      "resolved": "https://registry.npmjs.org/ox/-/ox-0.14.20.tgz",
+      "integrity": "sha512-rby38C3nDn8eQkf29Zgw4hkCZJ64Qqi0zRPWL8ENUQ7JVuoITqrVtwWQgM/He19SCMUEc7hS/Sjw0jIOSLJhOw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/wevm"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@adraffy/ens-normalize": "^1.11.0",
+        "@noble/ciphers": "^1.3.0",
+        "@noble/curves": "1.9.1",
+        "@noble/hashes": "^1.8.0",
+        "@scure/bip32": "^1.7.0",
+        "@scure/bip39": "^1.6.0",
+        "abitype": "^1.2.3",
+        "eventemitter3": "5.0.1"
+      },
+      "peerDependencies": {
+        "typescript": ">=5.4.0"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ox/node_modules/@noble/ciphers": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@noble/ciphers/-/ciphers-1.3.0.tgz",
+      "integrity": "sha512-2I0gnIVPtfnMw9ee9h1dJG7tp81+8Ob3OJb3Mv37rx5L40/b0i7djjCVvGOVqc9AEIQyvyu1i6ypKdFw8R8gQw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/ox/node_modules/@noble/curves": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.9.1.tgz",
+      "integrity": "sha512-k11yZxZg+t+gWvBbIswW0yoJlu8cHOC7dhunwOzoWH/mXGBiYyR4YY6hAEK/3EUs4UpB8la1RfdRpeGsFHkWsA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "1.8.0"
+      },
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/ox/node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
     "node_modules/path-browserify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-1.0.1.tgz",
@@ -2542,6 +2752,66 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/viem": {
+      "version": "2.48.4",
+      "resolved": "https://registry.npmjs.org/viem/-/viem-2.48.4.tgz",
+      "integrity": "sha512-mReP/rgY2P+WeeRSG4sUvccCLKfyAW1C73Y3KkobAqgzYmVna9qyUMNE44xIUkDtfvRuC33r24UhF4baBYovsg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/wevm"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@noble/curves": "1.9.1",
+        "@noble/hashes": "1.8.0",
+        "@scure/bip32": "1.7.0",
+        "@scure/bip39": "1.6.0",
+        "abitype": "1.2.3",
+        "isows": "1.0.7",
+        "ox": "0.14.20",
+        "ws": "8.18.3"
+      },
+      "peerDependencies": {
+        "typescript": ">=5.0.4"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/viem/node_modules/@noble/curves": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.9.1.tgz",
+      "integrity": "sha512-k11yZxZg+t+gWvBbIswW0yoJlu8cHOC7dhunwOzoWH/mXGBiYyR4YY6hAEK/3EUs4UpB8la1RfdRpeGsFHkWsA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "1.8.0"
+      },
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/viem/node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
     "node_modules/vite": {
       "version": "6.3.3",
       "resolved": "https://registry.npmjs.org/vite/-/vite-6.3.3.tgz",
@@ -2775,6 +3045,28 @@
         "node": ">=8"
       }
     },
+    "node_modules/ws": {
+      "version": "8.18.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
diff --git a/package.json b/package.json
index 045e19d..0243c51 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@fileverse/crypto",
-  "version": "0.0.19",
+  "version": "0.0.19-viem-1",
   "description": "Crypto functions and helpers",
   "type": "module",
   "exports": {
@@ -39,6 +39,11 @@
       "import": "./dist/nacl/index.js",
       "require": "./dist/nacl/index.cjs"
     },
+    "./ens": {
+      "types": "./dist/ens/index.d.ts",
+      "import": "./dist/ens/index.js",
+      "require": "./dist/ens/index.cjs"
+    },
     "./utils": {
       "types": "./dist/utils/index.d.ts",
       "import": "./dist/utils/index.js",
@@ -86,6 +91,7 @@
     "@vitest/ui": "^3.1.2",
     "terser": "^5.28.1",
     "typescript": "^5.8.3",
+    "viem": "^2.13.8",
     "vite": "^6.3.3",
     "vite-plugin-dts": "^4.5.3",
     "vitest": "^3.1.2"
@@ -97,5 +103,8 @@
     "@peculiar/webcrypto": "^1.5.0",
     "js-base64": "^3.7.7",
     "tweetnacl": "^1.0.3"
+  },
+  "peerDependencies": {
+    "viem": "^2.13.8"
   }
-}
+}
\ No newline at end of file
diff --git a/src/ens/__tests__/core.test.ts b/src/ens/__tests__/core.test.ts
new file mode 100644
index 0000000..27bae23
--- /dev/null
+++ b/src/ens/__tests__/core.test.ts
@@ -0,0 +1,105 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+const getEnsName = vi.fn();
+const createPublicClient = vi.fn(() => ({ getEnsName }));
+const http = vi.fn((url?: string) => ({ __transport: "http", url }));
+
+vi.mock("viem", async () => {
+  const actual = await vi.importActual<typeof import("viem")>("viem");
+  return {
+    ...actual,
+    createPublicClient: (...args: unknown[]) => createPublicClient(...args as []),
+    http: (...args: unknown[]) => http(...(args as [string?])),
+  };
+});
+
+import { getAddressName, resolveEnsAddress } from "../index";
+import { __resetMainnetClientsForTest } from "../client";
+
+const VALID_ADDRESS = "0x1234567890123456789012345678901234567890";
+const PROVIDER_URL = "https://eth.example/rpc";
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  __resetMainnetClientsForTest();
+});
+
+describe("ens/getAddressName", () => {
+  it("returns ENS name when resolver hits", async () => {
+    getEnsName.mockResolvedValueOnce("vitalik.eth");
+
+    const result = await getAddressName(VALID_ADDRESS, PROVIDER_URL);
+
+    expect(result).toEqual({
+      name: "vitalik.eth",
+      isEns: true,
+      resolved: true,
+    });
+    expect(getEnsName).toHaveBeenCalledWith({ address: VALID_ADDRESS });
+  });
+
+  it("returns address with resolved=true when no ENS exists", async () => {
+    getEnsName.mockResolvedValueOnce(null);
+
+    const result = await getAddressName(VALID_ADDRESS, PROVIDER_URL);
+
+    expect(result).toEqual({
+      name: VALID_ADDRESS,
+      isEns: false,
+      resolved: true,
+    });
+  });
+
+  it("short-circuits non-address inputs without calling viem", async () => {
+    const result = await getAddressName("not-an-address", PROVIDER_URL);
+
+    expect(result).toEqual({
+      name: "not-an-address",
+      isEns: false,
+      resolved: false,
+    });
+    expect(createPublicClient).not.toHaveBeenCalled();
+    expect(getEnsName).not.toHaveBeenCalled();
+  });
+
+  it("throws when providerUrl is missing", async () => {
+    await expect(getAddressName(VALID_ADDRESS, "")).rejects.toThrow(
+      /provider url/i,
+    );
+  });
+
+  it("returns unresolved default and swallows viem errors", async () => {
+    const consoleSpy = vi.spyOn(console, "log").mockImplementation(() => {});
+    getEnsName.mockRejectedValueOnce(new Error("network down"));
+
+    const result = await getAddressName(VALID_ADDRESS, PROVIDER_URL);
+
+    expect(result).toEqual({
+      name: VALID_ADDRESS,
+      isEns: false,
+      resolved: false,
+    });
+    expect(consoleSpy).toHaveBeenCalled();
+    consoleSpy.mockRestore();
+  });
+});
+
+describe("ens client memoization", () => {
+  it("reuses the client for the same providerUrl", async () => {
+    getEnsName.mockResolvedValue(null);
+
+    await resolveEnsAddress(VALID_ADDRESS, PROVIDER_URL);
+    await resolveEnsAddress(VALID_ADDRESS, PROVIDER_URL);
+
+    expect(createPublicClient).toHaveBeenCalledTimes(1);
+  });
+
+  it("creates separate clients for distinct URLs", async () => {
+    getEnsName.mockResolvedValue(null);
+
+    await resolveEnsAddress(VALID_ADDRESS, PROVIDER_URL);
+    await resolveEnsAddress(VALID_ADDRESS, "https://other.example/rpc");
+
+    expect(createPublicClient).toHaveBeenCalledTimes(2);
+  });
+});
\ No newline at end of file
diff --git a/src/ens/client.ts b/src/ens/client.ts
new file mode 100644
index 0000000..ce41b4b
--- /dev/null
+++ b/src/ens/client.ts
@@ -0,0 +1,30 @@
+import { createPublicClient, http, type PublicClient } from "viem";
+import { mainnet } from "viem/chains";
+
+const clientsByUrl = new Map<string, PublicClient>();
+
+/**
+ * Get a memoized viem mainnet `PublicClient` for the given RPC URL.
+ *
+ * One client is created per distinct URL and cached for the lifetime of the
+ * module, so repeated callers share connection pooling and avoid the cost of
+ * re-instantiating a client on every lookup.
+ *
+ * @param url - Mainnet RPC endpoint URL.
+ */
+export const getMainnetClient = (url: string): PublicClient => {
+  const existing = clientsByUrl.get(url);
+  if (existing) return existing;
+
+  const client = createPublicClient({
+    transport: http(url),
+    chain: mainnet,
+  });
+  clientsByUrl.set(url, client);
+  return client;
+};
+
+/** @internal Test-only: clear the memoized client map between cases. */
+export const __resetMainnetClientsForTest = () => {
+  clientsByUrl.clear();
+};
\ No newline at end of file
diff --git a/src/ens/index.ts b/src/ens/index.ts
new file mode 100644
index 0000000..559e25d
--- /dev/null
+++ b/src/ens/index.ts
@@ -0,0 +1,87 @@
+import { type Hex, isAddress } from "viem";
+import { getMainnetClient } from "./client";
+
+/**
+ * Result of {@link getAddressName}.
+ *
+ * - `name`: the ENS name when one was found, otherwise the input `address`.
+ * - `isEns`: `true` only when an ENS name was resolved.
+ * - `resolved`: `true` when the lookup completed (hit or confirmed miss);
+ *   `false` when the input wasn't a valid address or the lookup threw.
+ *   Use this to decide whether the result is safe to cache.
+ */
+export interface AddressNameResult {
+  name: string;
+  isEns: boolean;
+  resolved: boolean;
+}
+
+/**
+ * Look up the primary ENS name for an Ethereum mainnet address.
+ *
+ * Thin wrapper over viem's `getEnsName`. Reuses a memoized mainnet
+ * `PublicClient` per `providerUrl`, so it's safe to call in a hot path.
+ * Errors and invalid inputs propagate — prefer {@link getAddressName} for a
+ * caller-friendly result shape.
+ *
+ * @param address - Ethereum address (0x-prefixed hex). Not validated here.
+ * @param providerUrl - Mainnet RPC endpoint that supports ENS resolution.
+ * @returns The ENS name if one is set, otherwise `null`.
+ */
+export const resolveEnsAddress = async (
+  address: string,
+  providerUrl: string,
+): Promise<string | null> => {
+  const client = getMainnetClient(providerUrl);
+  return client.getEnsName({ address: address as Hex });
+};
+
+/**
+ * Resolve an address to its display name, falling back to the address itself.
+ *
+ * Behavior:
+ * - If `address` is not a valid Ethereum address, returns `{name: address,
+ *   isEns: false, resolved: false}` without making a network call.
+ * - On a successful lookup with an ENS name, returns
+ *   `{name: ensName, isEns: true, resolved: true}`.
+ * - On a successful lookup with no ENS name, returns
+ *   `{name: address, isEns: false, resolved: true}`.
+ * - On a viem/network error, logs and returns `{name: address, isEns: false,
+ *   resolved: false}` — `resolved: false` signals "don't cache this".
+ *
+ * @param address - Ethereum address to resolve.
+ * @param providerUrl - Mainnet RPC endpoint. Required; throws if empty.
+ * @throws If `providerUrl` is falsy.
+ */
+export const getAddressName = async (
+  address: string,
+  providerUrl: string,
+): Promise<AddressNameResult> => {
+  if (!providerUrl) {
+    throw new Error("cannot fetch ens name without a provider url");
+  }
+
+  const response: AddressNameResult = {
+    name: address,
+    isEns: false,
+    resolved: false,
+  };
+
+  if (!isAddress(address)) return response;
+
+  try {
+    const ensName = await resolveEnsAddress(address, providerUrl);
+    if (ensName) {
+      response.name = ensName;
+      response.isEns = true;
+      response.resolved = true;
+    } else {
+      response.name = address;
+      response.isEns = false;
+      response.resolved = true;
+    }
+  } catch (error) {
+    console.log(error);
+  }
+  return response;
+};
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 3541fb7..9d9d6e7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,7 @@
 export * from "./argon";
 export * from "./constants";
 export * from "./ecies";
+export * from "./ens";
 export * from "./kdf";
 export * from "./nacl";
 export * from "./utils";
diff --git a/vite.config.ts b/vite.config.ts
index 256a093..414e4f4 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -59,9 +59,11 @@ export default defineConfig({
         "@noble/curves",
         "@noble/hashes",
         "js-base64",
+        "viem",
         /^@noble\/ciphers\/.*/,
         /^@noble\/curves\/.*/,
         /^@noble\/hashes\/.*/,
+        /^viem\/.*/,
       ],
       output: [
         {