Base Mainnet: Chain ID 8453 - Production with real USDC
Base Sepolia (Testnet): Chain ID 84532 - Developer testing with testnet USDC
Solana Mainnet - Production with real USDC

Payment: USDC Protocol: x402 v2 (CDP Facilitator)

Installation

# Base and Solana support (optional Solana deps auto-installed)
npm install @blockrun/llm
# or
pnpm add @blockrun/llm
# or
yarn add @blockrun/llm

Quick Start (Base - Default)

import { LLMClient } from '@blockrun/llm';

const client = new LLMClient();  // Uses BASE_CHAIN_WALLET_KEY (never sent to server)
const response = await client.chat('openai/gpt-4o', 'Hello!');

That's it. The SDK handles x402 payment automatically.

Quick Start (Solana)

import { LLMClient } from '@blockrun/llm';

const client = new LLMClient({ network: 'solana' });  // Uses BLOCKRUN_SOLANA_KEY
const response = await client.chat('openai/gpt-4o', 'Hello!');

For Solana, set BLOCKRUN_SOLANA_KEY environment variable with your base58-encoded Solana secret key.

How It Works

You send a request to BlockRun's API
The API returns a 402 Payment Required with the price
The SDK automatically signs a USDC payment on Base
The request is retried with the payment proof
You receive the AI response

Your private key never leaves your machine - it's only used for local signing.

Available Models

OpenAI GPT-5 Family

Model	Input Price	Output Price
`openai/gpt-5.2`	$1.75/M	$14.00/M
`openai/gpt-5.1`	$1.25/M	$10.00/M
`openai/gpt-5`	$1.25/M	$10.00/M
`openai/gpt-5-mini`	$0.25/M	$2.00/M
`openai/gpt-5-nano`	$0.05/M	$0.40/M
`openai/gpt-5.2-pro`	$21.00/M	$168.00/M
`openai/gpt-5-pro`	$15.00/M	$120.00/M

OpenAI GPT-4 Family

Model	Input Price	Output Price
`openai/gpt-4.1`	$2.00/M	$8.00/M
`openai/gpt-4.1-mini`	$0.40/M	$1.60/M
`openai/gpt-4.1-nano`	$0.10/M	$0.40/M
`openai/gpt-4o`	$2.50/M	$10.00/M
`openai/gpt-4o-mini`	$0.15/M	$0.60/M

OpenAI O-Series (Reasoning)

Model	Input Price	Output Price
`openai/o1`	$15.00/M	$60.00/M
`openai/o1-mini`	$1.10/M	$4.40/M
`openai/o3`	$2.00/M	$8.00/M
`openai/o3-mini`	$1.10/M	$4.40/M
`openai/o4-mini`	$1.10/M	$4.40/M

Anthropic Claude

Model	Input Price	Output Price
`anthropic/claude-opus-4`	$15.00/M	$75.00/M
`anthropic/claude-sonnet-4`	$3.00/M	$15.00/M
`anthropic/claude-haiku-4.5`	$1.00/M	$5.00/M

Google Gemini

Model	Input Price	Output Price
`google/gemini-3-pro-preview`	$2.00/M	$12.00/M
`google/gemini-2.5-pro`	$1.25/M	$10.00/M
`google/gemini-2.5-flash`	$0.15/M	$0.60/M

DeepSeek

Model	Input Price	Output Price
`deepseek/deepseek-chat`	$0.28/M	$0.42/M
`deepseek/deepseek-reasoner`	$0.28/M	$0.42/M

xAI Grok

Model	Input Price	Output Price
`xai/grok-3`	$3.00/M	$15.00/M
`xai/grok-3-fast`	$5.00/M	$25.00/M
`xai/grok-3-mini`	$0.30/M	$0.50/M

Moonshot Kimi

Model	Input Price	Output Price
`moonshot/kimi-k2.5`	$0.60/M	$3.00/M

E2E Verified Models

All models below have been tested end-to-end via the TypeScript SDK (Feb 2026):

Provider	Model	Status
OpenAI	`openai/gpt-4o-mini`	Passed
Anthropic	`anthropic/claude-sonnet-4`	Passed
Google	`google/gemini-2.5-flash`	Passed
DeepSeek	`deepseek/deepseek-chat`	Passed
xAI	`xai/grok-3-fast`	Passed
Moonshot	`moonshot/kimi-k2.5`	Passed

Image Generation

Model	Price
`openai/dall-e-3`	$0.04-0.08/image
`openai/gpt-image-1`	$0.02-0.04/image
`google/nano-banana`	$0.05/image
`google/nano-banana-pro`	$0.10-0.15/image
`black-forest/flux-1.1-pro`	$0.04/image

Testnet Models (Base Sepolia)

Model	Price
`openai/gpt-oss-20b`	$0.001/request
`openai/gpt-oss-120b`	$0.002/request

Testnet models use flat pricing (no token counting) for simplicity.

Testnet Usage

For development and testing without real USDC, use the testnet:

import { testnetClient } from '@blockrun/llm';

// Create testnet client (uses Base Sepolia)
const client = testnetClient({ privateKey: '0x...' });

// Chat with testnet model
const response = await client.chat('openai/gpt-oss-20b', 'Hello!');
console.log(response);

// Check if client is on testnet
console.log(client.isTestnet()); // true

Testnet Setup

Get testnet ETH from Alchemy Base Sepolia Faucet
Get testnet USDC from Circle USDC Faucet
Set your wallet key: export BASE_CHAIN_WALLET_KEY=0x...

Available Testnet Models

openai/gpt-oss-20b - $0.001/request (flat price)
openai/gpt-oss-120b - $0.002/request (flat price)

Manual Testnet Configuration

import { LLMClient } from '@blockrun/llm';

// Or configure manually
const client = new LLMClient({
  privateKey: '0x...',
  apiUrl: 'https://testnet.blockrun.ai/api'
});
const response = await client.chat('openai/gpt-oss-20b', 'Hello!');

Usage Examples

Simple Chat

import { LLMClient } from '@blockrun/llm';

const client = new LLMClient();  // Uses BASE_CHAIN_WALLET_KEY (never sent to server)

const response = await client.chat('openai/gpt-4o', 'Explain quantum computing');
console.log(response);

// With system prompt
const response2 = await client.chat('anthropic/claude-sonnet-4', 'Write a haiku', {
  system: 'You are a creative poet.',
});

Full Chat Completion

import { LLMClient, type ChatMessage } from '@blockrun/llm';

const client = new LLMClient();  // Uses BASE_CHAIN_WALLET_KEY (never sent to server)

const messages: ChatMessage[] = [
  { role: 'system', content: 'You are a helpful assistant.' },
  { role: 'user', content: 'How do I read a file in Node.js?' },
];

const result = await client.chatCompletion('openai/gpt-4o', messages);
console.log(result.choices[0].message.content);

List Available Models

import { LLMClient } from '@blockrun/llm';

const client = new LLMClient();  // Uses BASE_CHAIN_WALLET_KEY (never sent to server)
const models = await client.listModels();

for (const model of models) {
  console.log(`${model.id}: $${model.inputPrice}/M input`);
}

Multiple Requests

import { LLMClient } from '@blockrun/llm';

const client = new LLMClient();  // Uses BASE_CHAIN_WALLET_KEY (never sent to server)

const [gpt, claude, gemini] = await Promise.all([
  client.chat('openai/gpt-4o', 'What is 2+2?'),
  client.chat('anthropic/claude-sonnet-4', 'What is 3+3?'),
  client.chat('google/gemini-2.5-flash', 'What is 4+4?'),
]);

Configuration

// Default: reads BASE_CHAIN_WALLET_KEY from environment
const client = new LLMClient();

// Or pass options explicitly
const client = new LLMClient({
  privateKey: '0x...',           // Your wallet key (never sent to server)
  apiUrl: 'https://blockrun.ai/api',   // Optional
  timeout: 60000,                // Optional (ms)
});

Environment Variables

Variable	Description
`BASE_CHAIN_WALLET_KEY`	Your Base chain wallet private key (for Base)
`BLOCKRUN_SOLANA_KEY`	Your Solana wallet secret key - base58 (for Solana)
`BLOCKRUN_NETWORK`	Default network: `base` or `solana` (optional, default: base)
`BLOCKRUN_API_URL`	API endpoint (optional, default: https://blockrun.ai/api)

Error Handling

import { LLMClient, APIError, PaymentError } from '@blockrun/llm';

const client = new LLMClient();

try {
  const response = await client.chat('openai/gpt-4o', 'Hello!');
} catch (error) {
  if (error instanceof PaymentError) {
    console.error('Payment failed - check USDC balance');
  } else if (error instanceof APIError) {
    console.error(`API error: ${error.message}`);
  }
}

Testing

Running Unit Tests

Unit tests do not require API access or funded wallets:

npm test                          # Run tests in watch mode
npm test run                      # Run tests once
npm test -- --coverage            # Run with coverage report

Running Integration Tests

Integration tests call the production API and require:

A funded Base wallet with USDC ($1+ recommended)
BASE_CHAIN_WALLET_KEY environment variable set
Estimated cost: ~$0.05 per test run

export BASE_CHAIN_WALLET_KEY=0x...
npm test -- test/integration       # Run integration tests only

Integration tests are automatically skipped if BASE_CHAIN_WALLET_KEY is not set.

Setting Up Your Wallet

Base (EVM)

Create a wallet on Base (Coinbase Wallet, MetaMask, etc.)
Get USDC on Base for API payments
Export your private key and set as BASE_CHAIN_WALLET_KEY

# .env
BASE_CHAIN_WALLET_KEY=0x...

Solana

Create a Solana wallet (Phantom, Backpack, Solflare, etc.)
Get USDC on Solana for API payments
Export your secret key and set as BLOCKRUN_SOLANA_KEY

# .env
BLOCKRUN_SOLANA_KEY=...your_base58_secret_key

Note: Solana transactions are gasless for the user - the CDP facilitator pays for transaction fees.

Security

Private Key Safety

Private key stays local: Your key is only used for signing on your machine
No custody: BlockRun never holds your funds
Verify transactions: All payments are on-chain and verifiable

Best Practices

Private Key Management:

Use environment variables, never hard-code keys
Use dedicated wallets for API payments (separate from main holdings)
Set spending limits by only funding payment wallets with small amounts
Never commit .env files to version control
Rotate keys periodically

Input Validation: The SDK validates all inputs before API requests:

Private keys (format, length, valid hex)
API URLs (HTTPS required for production, HTTP allowed for localhost)
Model names and parameters (ranges for max_tokens, temperature, top_p)

Error Sanitization: API errors are automatically sanitized to prevent sensitive information leaks.

Monitoring:

const address = client.getWalletAddress();
console.log(`View transactions: https://basescan.org/address/${address}`);

Keep Updated:

npm update @blockrun/llm  # Get security patches

TypeScript Support

Full TypeScript support with exported types:

import {
  LLMClient,
  testnetClient,
  type ChatMessage,
  type ChatResponse,
  type ChatOptions,
  type Model,
  APIError,
  PaymentError,
} from '@blockrun/llm';

License

MIT

Keywords

FAQs

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Package last updated on 08 Feb 2026

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Install

@blockrun/llm