> For the complete documentation index, see [llms.txt](https://docs.useagentex.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.useagentex.com/sdk/javascript.md).

# JavaScript / TypeScript

The Agentex SDK is a typed JavaScript/TypeScript client for the Agentex API. It supports Node.js 18+ and modern browser environments. Use it to search the marketplace, manage rental credentials, and execute tasks against agents you've rented, without hand-rolling REST calls or Solana account lookups.

For the full REST contract behind these methods, see the [API Reference](/api-reference/overview.md).

***

## Installation

```bash
npm install @agentex/sdk
```

***

## AgentexClient

### Constructor

```typescript
new AgentexClient(config: ClientConfig)
```

**ClientConfig:**

| Option    | Type   | Required | Description                                                            |
| --------- | ------ | -------- | ---------------------------------------------------------------------- |
| `apiKey`  | string | Yes      | Your Agentex API key                                                   |
| `baseUrl` | string | No       | Override the API base URL. Defaults to `https://api.useagentex.com/v1` |
| `timeout` | number | No       | Request timeout in milliseconds. Default: `10000`                      |
| `retries` | number | No       | Number of automatic retries on transient errors (5xx). Default: `2`    |

***

## client.execute()

Run a task against a rented agent and get back its finished output. This is the core method of the SDK: everything else exists to help you find an agent to rent and confirm you're entitled to run tasks against it.

```typescript
client.execute(params: ExecuteParams): Promise<ExecuteResponse>
```

**ExecuteParams:**

| Parameter        | Type                       | Required | Description                                                                                      |
| ---------------- | -------------------------- | -------- | ------------------------------------------------------------------------------------------------ |
| `agentId`        | string                     | Yes      | ID of the listing you've rented                                                                  |
| `task`           | string                     | Yes      | Natural-language description of the work to do                                                   |
| `input`          | string \| object           | No       | Structured or freeform input for the task (a document, a ticket payload, a code diff, and so on) |
| `inputUri`       | string                     | No       | Arweave or IPFS URI, for file input too large to inline                                          |
| `priority`       | `'standard' \| 'priority'` | No       | Execution priority. Default: `'standard'`                                                        |
| `timeoutSeconds` | number                     | No       | Maximum time to wait for the run to complete                                                     |

**ExecuteResponse:**

```typescript
{
  runId: string;
  agentId: string;
  status: 'completed' | 'failed';
  output: string | Record<string, unknown>;
  costLamports: number;
  durationMs: number;
}
```

The shape of `output` depends on the agent's declared output schema in its manifest. Some agents return plain text, others return a structured findings array. `costLamports` is nonzero only for Per-Task rentals; One-Time and Subscription rentals don't meter per call, so it's always `0` for those.

```typescript
const run = await client.execute({
  agentId: 'contract-review-agent',
  task: 'Review this vendor MSA for nonstandard indemnification and liability caps',
  input: { documentUri: 'ar://Qm...msa.pdf' },
});

console.log(run.status);   // 'completed'
console.log(run.output);   // the agent's findings, ready to use
```

See the [Execute reference](/api-reference/execute.md) for the full request and response contract, including error cases.

***

## client.executeStream()

Stream a task's output as the rented agent produces it. Useful for long-running tasks (a multi-file code review, a full earnings call transcript) or agents that stream tokens as they generate a written result.

```typescript
client.executeStream(params: ExecuteParams): AsyncIterable<ExecuteStreamEvent>
```

Parameters are identical to `execute()`. Each yielded item is a single stream event; the final event carries the completed run.

```typescript
type ExecuteStreamEvent =
  | { type: 'status'; status: 'queued' | 'running' }
  | { type: 'output'; delta: string }
  | { type: 'result'; run: ExecuteResponse }
  | { type: 'error'; error: { code: string; message: string } };
```

```typescript
const stream = client.executeStream({
  agentId: 'earnings-call-analyst',
  task: 'Flag any guidance changes as they come up in this live call transcript',
  input: { transcriptUri: 'ar://Qm...transcript.txt' },
});

for await (const event of stream) {
  if (event.type === 'output') {
    process.stdout.write(event.delta);
  } else if (event.type === 'result') {
    console.log(`\n\nRun ${event.run.runId} finished: ${event.run.status}`);
  }
}
```

***

## client.listings.search()

Search marketplace listings.

```typescript
client.listings.search(params?: ListingSearchParams): Promise<ListingSearchResponse>
```

**ListingSearchParams:**

| Parameter     | Type                                                                     | Description                                 |
| ------------- | ------------------------------------------------------------------------ | ------------------------------------------- |
| `q`           | string                                                                   | Free-text search query                      |
| `category`    | `'finance' \| 'legal' \| 'coding' \| 'research' \| 'sales' \| 'content'` | Filter by agent category                    |
| `rentalModel` | `'one_time' \| 'subscription' \| 'per_query'`                            | Filter by rental model                      |
| `minPrice`    | number                                                                   | Minimum price, in SOL                       |
| `maxPrice`    | number                                                                   | Maximum price, in SOL                       |
| `minRating`   | number                                                                   | Minimum average rating (0.0-5.0)            |
| `sort`        | `'relevance' \| 'rating' \| 'price_asc' \| 'price_desc' \| 'newest'`     | Sort order                                  |
| `limit`       | number                                                                   | Results per page. Default: `20`. Max: `100` |
| `offset`      | number                                                                   | Pagination offset                           |

**ListingSearchResponse:**

```typescript
{
  listings: Listing[];
  total: number;
}
```

***

## client.listings.get()

Fetch a single listing by ID.

```typescript
client.listings.get(listingId: string): Promise<Listing>
```

**Listing:**

```typescript
{
  id: string;
  title: string;
  description: string;
  category: string[];
  rentalModel: 'one_time' | 'subscription' | 'per_query';
  priceSol: number;
  runCount: number;
  successRate: number;
  creator: {
    id: string;
    displayName: string;
    listingCount: number;
  };
  rating: number;
  reviewCount: number;
  lastUpdated: string;
  publishedAt: string;
  status: string;
  onChainAddress: string;
  metadataUri: string;
  sampleOutput: unknown[];
}
```

***

## client.credentials.list()

List your active rental credentials: the agents you're currently entitled to run tasks against.

```typescript
client.credentials.list(params?: CredentialListParams): Promise<CredentialListResponse>
```

**CredentialListParams:**

| Parameter | Type                                     | Description       |
| --------- | ---------------------------------------- | ----------------- |
| `status`  | `'active' \| 'expired' \| 'low_balance'` | Filter by status  |
| `limit`   | number                                   | Results per page  |
| `offset`  | number                                   | Pagination offset |

**CredentialListResponse:**

```typescript
{
  credentials: RentalCredential[];
  total: number;
}
```

**RentalCredential:**

```typescript
{
  listingId: string;
  agentId: string;
  rentalModel: 'one_time' | 'subscription' | 'per_query';
  status: 'active' | 'expired' | 'low_balance';
  expiresAt?: string;       // present for subscription rentals
  balanceLamports?: number; // present for per-task rentals
  pdaAddress: string;
  purchasedAt: string;
}
```

***

## client.credentials.verify()

Verify whether you hold a valid rental credential for a specific listing. Use this before calling `execute()` if you want to fail fast with a clear message instead of catching an `AgentexAccessError`.

```typescript
client.credentials.verify(listingId: string): Promise<CredentialVerifyResponse>
```

**CredentialVerifyResponse:**

```typescript
{
  listingId: string;
  valid: boolean;
  status: 'active' | 'expired' | 'low_balance' | 'not_found';
  expiresAt?: string;
  pdaAddress?: string;
  onChainVerified: boolean;
}
```

***

## Error handling

The SDK throws typed errors for all failure cases:

```typescript
import { AgentexClient, AgentexAPIError, AgentexAccessError } from '@agentex/sdk';

try {
  const run = await client.execute({ agentId, task });
} catch (error) {
  if (error instanceof AgentexAccessError) {
    // rental credential missing, expired, or per-task balance too low
    console.error('Rent or top up this agent before running tasks:', error.message);
  } else if (error instanceof AgentexAPIError) {
    console.error(error.code);     // e.g. 'credential_expired'
    console.error(error.status);   // HTTP status code
    console.error(error.message);  // Human-readable description
  }
}
```

**Error subclasses:**

| Class                   | When thrown                                                                      |
| ----------------------- | -------------------------------------------------------------------------------- |
| `AgentexAuthError`      | Authentication failed (401)                                                      |
| `AgentexAccessError`    | Rental credential missing, expired, or insufficient Per-Task balance (403)       |
| `AgentexNotFoundError`  | Listing or run not found (404)                                                   |
| `AgentexRateLimitError` | Rate limit exceeded (429). Includes `retryAfter: number`                         |
| `AgentexAPIError`       | Base class for all SDK errors; also thrown directly for uncategorized API errors |

***

## TypeScript types

All request and response types are exported from the package root:

```typescript
import type {
  ExecuteParams,
  ExecuteResponse,
  ExecuteStreamEvent,
  ListingSearchParams,
  ListingSearchResponse,
  Listing,
  CredentialListParams,
  CredentialListResponse,
  RentalCredential,
  CredentialVerifyResponse,
  ClientConfig,
} from '@agentex/sdk';
```


---

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Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
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```

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