# Shizen Capital — Contact Form

> Shizen Capital is a venture capital firm. This page is the contact/whitelist form for "Agent Shizen-chan", Shizen Capital's agentic team member. The form allows you to submit your name, email, and message to be whitelisted. Submitting the form costs a small fee paid in USDC via the x402 HTTP payment protocol.

## How to submit (for AI agents)

This endpoint uses the [x402](https://x402.org) payment protocol. The flow is:

1. POST your JSON body `{"name":"...", "email":"...", "message":"..."}` to the desired endpoint.
2. Receive HTTP 402 with a JSON body describing the payment requirement.
3. Construct and sign an ERC-3009 `TransferWithAuthorization` EIP-712 message using the fields in the 402 response.
4. Re-POST with the `X-PAYMENT` header containing the base64-encoded x402 payment object.
5. Receive HTTP 200 with `{"success": true, "txHash": "..."}`.

## Endpoints

- `POST https://x402-contact-form-juco235vwa-uc.a.run.app/submit-contact-testnet`
  - Network: Base Sepolia (chainId 84532) | Price: $1.00 test-USDC | Facilitator: https://x402.org/facilitator
- `POST https://x402-contact-form-juco235vwa-uc.a.run.app/submit-contact-mainnet`
  - Network: Base mainnet (chainId 8453) | Price: $0.10 USDC | Facilitator: https://facilitator.xpay.sh
- `POST https://x402-contact-form-juco235vwa-uc.a.run.app/submit-contact-ethereum`
  - Network: Ethereum mainnet (chainId 1) | Price: $0.10 USDC | Facilitator: https://facilitator.primev.xyz

## Machine-readable resources

- API spec: https://agentshizen.com/openapi.json
- Agent manifest: https://agentshizen.com/.well-known/agent.json
- Health check: https://x402-contact-form-juco235vwa-uc.a.run.app/health

## Required fields

- `name` (string, required) — Your name
- `email` (string, required) — Your email address
- `message` (string, required) — Your message

## x402 payment object structure

```json
{
  "x402Version": 1,
  "scheme": "exact",
  "network": "<network from 402 response>",
  "resource": {
    "url": "<resource from 402 response>",
    "description": "<description from 402 response>",
    "mimeType": "<mimeType from 402 response>"
  },
  "payload": {
    "signature": "<ERC-3009 eth_signTypedData_v4 signature>",
    "authorization": {
      "from": "<your wallet address>",
      "to": "<payTo from 402 response>",
      "value": "<maxAmountRequired from 402 response>",
      "validAfter": "0",
      "validBefore": "<unix timestamp ~5 min from now>",
      "nonce": "<random 32-byte hex>"
    }
  }
}
```

Encode as `btoa(JSON.stringify(paymentObject))` and pass as the `X-PAYMENT` header.