const client = createOffchainClient({ mode: "mainnet", defaultApiKey: process.env.NAMESPACE_API_KEY, });


Use `'sepolia'` for testing, `'mainnet'` for production. Get API keys at https://dev.namespace.ninja

### 2. Check availability before creating

`createSubname` will overwrite an existing subname. Always check first.

```typescript
const { isAvailable } = await client.isSubnameAvailable("alice.example.eth");

3. Create subname with owner

Include owner to enable address→name filtering via getFilteredSubnames.

import { ChainName } from "@thenamespace/offchain-manager";

await client.createSubname({
  label: "alice",
  parentName: "example.eth",
  owner: "0x1234...",
  addresses: [{ chain: ChainName.Ethereum, value: "0x1234..." }],
  texts: [
    { key: "name", value: "Alice" },
    { key: "url", value: "https://example.com" },
  ],
  contenthash: "ipfs://baf...",
  metadata: [{ key: "customData", value: "any value" }],
});

Metadata is the custom field that the developer want to set to the subname which does not reflect on the ENS name but be used to query through SDK.

4. Query and filter subnames

parentName or parentNames is required.

const page = await client.getFilteredSubnames({
  parentName: "example.eth",
  owner: "0x1234...",
  page: 1,
  size: 50,
});

Workaround: use the `owner` field when creating subnames, then query via `getFilteredSubnames({ parentName, owner })` for address→name lookups. Recommend one address per one subname for clean reverse mapping.

page.items.forEach((s) => console.log(s.fullName, s.texts, s.addresses));

5. Read records

const allTexts = await client.getTextRecords("alice.example.eth");
const { record: name } = await client.getTextRecord(
  "alice.example.eth",
  "name",
);

Core Methods

Subname CRUD

client.createSubname(request: CreateSubnameRequest): Promise<void>
client.updateSubname(subname: string, request: UpdateSubnameRequest): Promise<void>
client.deleteSubname(fullSubname: string): Promise<void>

Deletion is irreversible — all records are removed.

Queries

client.isSubnameAvailable(fullSubname: string): Promise<{ isAvailable: boolean }>
client.getSingleSubname(fullName: string): Promise<SubnameDTO | null>
client.getFilteredSubnames(query: QuerySubnamesRequest): Promise<PagedResponse<SubnameDTO[]>>

Address Records

client.addAddressRecord(subname: string, chain: ChainName, value: string): Promise<void>
client.deleteAddressRecord(subname: string, chain: ChainName): Promise<void>
client.setDefaultEvmAddress(subname: string, value: string): Promise<void>

Text Records

client.addTextRecord(subname: string, key: string, value: string): Promise<void>
client.deleteTextRecord(subname: string, key: string): Promise<void>
client.getTextRecords(fullSubname: string): Promise<Record<string, string>>
client.getTextRecord(fullSubname: string, key: string): Promise<{ record: string }>

Metadata Records

Not resolved onchain. Useful for discovery and filtering via getFilteredSubnames.

client.addDataRecord(fullSubname: string, key: string, data: string): Promise<void>
client.deleteDataRecord(subname: string, key: string): Promise<void>
client.getDataRecords(fullSubname: string): Promise<Record<string, string>>
client.getDataRecord(fullSubname: string, key: string): Promise<{ record: string }>

Do not store sensitive information — metadata is readable by anyone with API access.

API Key Configuration

client.setDefaultApiKey(apiKey: string): void
client.setApiKey(ensName: string, apiKey: string): void

Priority: domain-specific key → default address-based key.

offchain-ens-subname-sdk

Offchain Manager SDK

Installation

Quick Start

1. Initialize the client