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feat: add BlockRun wallet provider for pay-per-request AI access (#1408)
Integrates BlockRun (blockrun.ai) as a new AI provider option via x402 micropayment protocol, allowing users to access top AI models with USDC without requiring individual API keys. - Add BlockRun Base (EVM) and Solana wallet providers to model selector - Implement x402 v2 EIP-712 payment signing for Base (mcp/blockrun_base.go) - Implement x402 v2 SPL TransferChecked signing for Solana (mcp/blockrun_sol.go) - Wire blockrun-base and blockrun-sol into trader factory (auto_trader.go) - Register both providers in supported models API (server.go) - Add BlockRun card UI with wallet key input in Step 0/1 of model config modal - Add BlockRun SVG icon and ModelIcons support - Add setup guides for Base and Solana wallet configuration (docs/) - Available flagship models: GPT-5.4, Claude Opus 4.6, Gemini 3.1 Pro, Grok 3, DeepSeek Chat, MiniMax M2.5
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docs/getting-started/blockrun-base-wallet.md
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docs/getting-started/blockrun-base-wallet.md
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# BlockRun Base (EVM) Wallet Setup Guide
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This guide explains how to use a Base network EVM wallet to pay for AI usage through BlockRun — no API key required.
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**Language:** [English](blockrun-base-wallet.md) | [中文](blockrun-base-wallet.zh-CN.md)
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## What is BlockRun?
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[BlockRun](https://blockrun.ai) is a decentralized AI inference gateway that lets you access top AI models (Claude, GPT, Gemini, Grok, DeepSeek, etc.) by paying per request with USDC — no monthly subscriptions, no API key signups.
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NOFX integrates BlockRun via the **x402 micropayment protocol**: each AI inference request automatically pays a small USDC fee directly from your wallet. You only pay for what you use.
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## Why Use BlockRun?
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| Feature | Traditional API Key | BlockRun Wallet |
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|---------|-------------------|-----------------|
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| Setup | Register + billing | Just a wallet address |
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| Cost model | Monthly subscription | Pay-per-request |
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| Models | One provider | All top models |
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| Privacy | Account required | Pseudonymous |
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| Control | Rate limits apply | Your wallet, your budget |
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## Prerequisites
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- An EVM wallet with USDC on **Base network** (chain ID 8453)
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- The wallet private key (hex format: `0x...`)
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### Getting USDC on Base
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1. Buy USDC on Coinbase and withdraw to Base, **or**
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2. Bridge USDC from Ethereum using [bridge.base.org](https://bridge.base.org), **or**
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3. Swap on [Aerodrome](https://aerodrome.finance) or [Uniswap](https://app.uniswap.org) on Base
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> **Tip:** A few dollars of USDC is enough to start — each AI call costs fractions of a cent.
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## Step 1: Get Your Wallet Private Key
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> ⚠️ **Security Warning:** Never share your private key with anyone. Use a dedicated trading wallet, not your main holdings wallet.
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**Option A — Create a new wallet (recommended):**
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1. Open MetaMask → Create New Account
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2. Go to Account Details → Export Private Key
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3. Copy the hex key (starts with `0x`)
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**Option B — Use an existing wallet:**
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1. MetaMask → Account Details → Export Private Key
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2. Enter your MetaMask password to reveal the key
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**Option C — Generate via CLI:**
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```bash
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# Using cast (foundry)
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cast wallet new
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# Output: Address: 0x... | Private key: 0x...
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```
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## Step 2: Fund the Wallet with USDC on Base
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Send USDC to your wallet address on Base network:
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- **USDC contract:** `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`
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- **Network:** Base (chain ID 8453)
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- **Recommended starting amount:** $5–$20 USDC
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Check your balance at [basescan.org](https://basescan.org).
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## Step 3: Configure in NOFX
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1. Open NOFX at `http://localhost:3000`
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2. Log in and go to **Config** tab
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3. Click **+ Add AI Model**
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4. In Step 0, scroll to **Via BlockRun Wallet** section
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5. Select **BlockRun · Base Wallet**
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6. In Step 1, configure:
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- **Wallet Private Key:** Your hex private key (`0x...`)
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- **Select Model:** Choose from Claude Opus, GPT-5.4, Gemini 3 Pro, Grok 3, DeepSeek R1, or leave as **Auto** for best available
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7. Click **Save**
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## How Payment Works
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When NOFX sends an AI request:
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1. Request goes to `https://blockrun.ai/api/v1/chat/completions`
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2. Server responds with HTTP `402 Payment Required` + payment details
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3. NOFX signs a **ERC-3009 TransferWithAuthorization** (EIP-712) with your private key
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4. Payment signature is attached and request is retried
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5. BlockRun verifies the signature, routes the request to the AI model, and charges USDC
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> **Privacy:** Your private key never leaves your NOFX instance. Only the cryptographic signature is sent.
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## Available Models via BlockRun
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| Model ID | Provider | Use Case |
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|----------|----------|----------|
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| `gpt-5.4` | OpenAI | Flagship (default) |
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| `claude-opus-4.6` | Anthropic | Flagship |
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| `gemini-3.1-pro` | Google | Flagship |
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| `grok-3` | xAI | Flagship |
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| `deepseek-chat` | DeepSeek | Flagship |
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| `minimax-m2.5` | MiniMax | Flagship |
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## Security Best Practices
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- ✅ Use a **dedicated wallet** with only trading budget, not your main wallet
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- ✅ Keep only a small USDC balance (top up as needed)
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- ✅ Your private key is encrypted at rest in NOFX's database
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- ✅ Signatures are spend-limited — each signature authorizes only the exact amount for one request
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- ❌ Never export or share your private key outside of NOFX
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## Troubleshooting
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| Issue | Solution |
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|-------|----------|
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| `no private key set` | Check your key was saved correctly; re-enter in Config |
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| `payment retry failed` | Ensure you have USDC on **Base** (not Ethereum mainnet) |
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| `invalid private key` | Key must be hex format with `0x` prefix, 66 chars total |
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| Payment deducted but no response | Check BlockRun status at [blockrun.ai](https://blockrun.ai) |
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| Slow responses | Try selecting a specific model instead of "Auto" |
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## Monitoring Spend
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Check your USDC balance and transaction history at:
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- [Basescan](https://basescan.org) — search your wallet address
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- [BlockRun dashboard](https://blockrun.ai) — usage history
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---
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[← Back to Getting Started](README.md)
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