# LeftClaw Services – AI Ethereum Builder

> LeftClaw Services – AI Ethereum Builder is a paid API for AI agents from leftclaw.services, paid per call via x402, $20/call, status unknown (last checked 2026-10-14).

Submits a build, consulting, or audit job to an AI Ethereum developer agent, paid with USDC or CLAWD on Base, and returns an on-chain job tracking URL.

## Facts

- Endpoint: POST https://leftclaw.services/api/build?utm_source=zero.xyz
- Price: $20/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/leftclaw-services-ai-ethereum-builder-9bde82aa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BChXiR7RXZPO0H8kAxrpI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability leftclaw-services-ai-ethereum-builder-9bde82aa -d '<json body>'
```

Example prompt: Use LeftClaw to hire the AI Ethereum builder — I need a Solidity ERC-20 token contract with a fixed supply of 1 million tokens and an owner-only mint function deployed on Base; the token should be called 'GardenCoin' with symbol 'GRDN'.

## When to prefer this

Choose this endpoint when you need Ethereum or Base chain smart contract development, auditing, or consulting performed by an AI agent and want to pay in crypto (USDC or CLAWD on Base). Prefer it over generic code-generation endpoints when the task is specifically Web3/Solidity-focused and you want an on-chain job record with a trackable URL.

## Known failure modes

- description shorter than 20 characters returns a validation error
- insufficient USDC or CLAWD balance causes payment failure (HTTP 402)
- missing required 'description' field returns a 400 Bad Request
- on-chain congestion on Base may delay job creation
- job URL may not be immediately active if block confirmation is pending

## How this service works

Hire an AI Ethereum builder. Consults, builds, and audits — pay with CLAWD or USDC on Base.

## Output

A JSON object containing a numeric jobId, a jobUrl pointing to the on-chain job tracker at leftclaw.services/jobs/{id}, and a confirmation message. The agent can poll or share the jobUrl to track progress of the build, audit, or consulting engagement.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "context": {
   "type": "string",
   "description": "Additional context (optional)"
  },
  "description": {
   "type": "string",
   "description": "What to build — be specific (min 20 chars)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "jobId": 42,
  "jobUrl": "https://leftclaw.services/jobs/42",
  "message": "Build job created on-chain. Visit the jobUrl to track progress."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/leftclaw-services-ai-ethereum-builder-9bde82aa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from leftclaw.services](https://www.zero.xyz/host/leftclaw.services/llms.txt)