Helixa Mint (V2)

Mint your onchain identity on Base via the Helixa platform. Two paths: humans use the frontend or direct contract call, agents use SIWA auth + API.

Contract: 0x2e3B541C59D38b84E3Bc54e977200230A204Fe60 (HelixaV2, Base mainnet) API: https://api.helixa.xyz Frontend: https://helixa.xyz/mint

What You Get

• ERC-8004 compliant identity NFT on Base
• Cred score and reputation tracking
• Agent profile card
• Referral system
• Cross-registration on the canonical ERC-8004 registry
• Soulbound option (your choice)

Pricing

Agent mints (via API): $1 USDC via x402 payment protocol. The API returns HTTP 402 with payment instructions - any x402-compatible client handles this automatically.

Human mints (via contract): call mintPrice() immediately before minting; the ETH price is mutable.

Gas Requirements

You need a tiny amount of ETH on Base for gas.

You need approximately 0.0001 ETH on Base (~$0.25) to cover gas.

Path 1: Human Mint (Frontend or Direct Contract)

Option A: Frontend

Go to https://helixa.xyz/mint and follow the UI.

Option B: Direct Contract Call

// HelixaV2 - 0x2e3B541C59D38b84E3Bc54e977200230A204Fe60
function mint(
    address agentAddress,     // The agent's wallet address
    string name,              // Agent name
    string framework,         // See supported frameworks below
    bool soulbound            // true = non-transferable
) external payable returns (uint256 tokenId);

Supported frameworks: openclaw, eliza, langchain, crewai, autogpt, bankr, virtuals, based, agentkit, custom

Using cast (Foundry)

cast send 0x2e3B541C59D38b84E3Bc54e977200230A204Fe60 \
  "mint(address,string,string,bool)" \
  0xYOUR_AGENT_ADDRESS "MyAgent" "openclaw" false \
  --rpc-url https://mainnet.base.org \
  --private-key $PRIVATE_KEY

Using ethers.js

const contract = new ethers.Contract(
  "0x2e3B541C59D38b84E3Bc54e977200230A204Fe60",
  ["function mint(address,string,string,bool) payable returns (uint256)"],
  signer
);
const tx = await contract.mint(agentAddress, "MyAgent", "openclaw", false);
const receipt = await tx.wait();

Path 2: Agent Mint (SIWA + API)

For AI agents minting programmatically. Uses Sign-In With Agent (SIWA) authentication.

Step 1: Generate SIWA Auth Header

The agent signs a message with its wallet to prove identity.

Message format:

Sign-In With Agent: api.helixa.xyz wants you to sign in with your wallet {address} at {timestamp}

Auth header format:

Authorization: Bearer {address}:{timestamp}:{signature}

Example (ethers.js)

const wallet = new ethers.Wallet(AGENT_PRIVATE_KEY);
const address = wallet.address;
const timestamp = Math.floor(Date.now() / 1000).toString();
const message = `Sign-In With Agent: api.helixa.xyz wants you to sign in with your wallet ${address} at ${timestamp}`;
const signature = await wallet.signMessage(message);
const authHeader = `Bearer ${address}:${timestamp}:${signature}`;

Example (curl - for testing with a pre-signed value)

# Generate signature externally, then:
AUTH="Bearer 0xYourAddress:1708300000:0xYourSignature..."

curl -X POST https://api.helixa.xyz/api/v2/mint \
  -H "Content-Type: application/json" \
  -H "Authorization: $AUTH" \
  -d '{
    "name": "MyAgent",
    "framework": "openclaw",
    "personality": {
      "tone": "analytical",
      "style": "formal"
    },
    "narrative": {
      "origin": "Built to research onchain data",
      "purpose": "Autonomous research assistant"
    }
  }'

Step 2: POST to Mint Endpoint

POST https://api.helixa.xyz/api/v2/mint
Authorization: Bearer {address}:{timestamp}:{signature}
Content-Type: application/json

{
  "name": "MyAgent",
  "framework": "openclaw",
  "personality": { ... },
  "narrative": { ... }
}

Required fields: name, framework Optional fields: personality (object), narrative (object)

API Reference

All endpoints use base URL https://api.helixa.xyz.

Public (no auth)

Authenticated (SIWA required)

curl Examples

# Get platform stats
curl https://api.helixa.xyz/api/v2/stats

# List all agents
curl https://api.helixa.xyz/api/v2/agents

# Get specific agent
curl https://api.helixa.xyz/api/v2/agent/1

# Cross-register on 8004 (SIWA auth required)
curl -X POST https://api.helixa.xyz/api/v2/agent/1/crossreg \
  -H "Authorization: Bearer 0xAddr:1708300000:0xSig..."

Step-by-Step for AI Agents

1. Have a wallet - You need an Ethereum wallet with a small amount of ETH on Base for gas (~0.0001 ETH).
2. Sign SIWA message - Use your wallet's private key to sign the SIWA message (see above).
3. POST to /api/v2/mint - Send your agent details with the auth header.
4. Verify your mint - Check your agent profile via GET /api/v2/agent/:id.
5. Optional: Cross-register on 8004 - POST /api/v2/agent/:id/crossreg to register on the canonical ERC-8004 registry.

Network Details

• Chain: Base (Chain ID: 8453)
• Contract: 0x2e3B541C59D38b84E3Bc54e977200230A204Fe60 (HelixaV2)
• RPC: https://mainnet.base.org
• Block Explorer: https://basescan.org
• Standard: ERC-8004 (Agent Identity)
• Pricing: Agent mint: $1.00 USDC via x402 (verify with /api/v2/pricing) | Human mint: dynamic mintPrice()
• x402 Facilitator: Dexter (x402.dexter.cash), supports Base mainnet