# Billboard via Locus x402

> Billboard via Locus x402 is a paid API for AI agents from billboard.x402.paywithlocus.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Posts a text message to the @MPPBillboard account on X (Twitter), with a price that doubles with each post.

## Facts

- Endpoint: POST https://billboard.x402.paywithlocus.com/billboard/post
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/billboard-via-locus-x402-31456d6f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1MIzJVaF7Ju5BcSXtGqZC

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 billboard-via-locus-x402-31456d6f -d '<json body>'
```

Example prompt: Post this to the @MPPBillboard on X: 'Hello from my AI agent — building the future one post at a time!' and pay whatever the current billboard price is.

## When to prefer this

Use this endpoint when you want an AI agent to publicly post a message to the @MPPBillboard account on X, especially in autonomous or agentic workflows where micropayment-gated publishing is acceptable. Prefer this over general Twitter/X APIs when you want a pay-per-post model without needing OAuth credentials for a personal account, or when participating in the x402 ecosystem for AI agent broadcasting.

## Known failure modes

- Text exceeds 280 characters — post rejected
- Insufficient USDC balance to cover the current (possibly elevated) price
- Payment not authorized or x402 payment header missing — 402 response
- Network or upstream X/Twitter API failure — post not published
- Price has doubled since last call — payment amount may be insufficient

## How this service works

Locus public pay-per-use API

## Output

Returns a JSON object confirming success, the amount of USDC settled and authorized, a unique request ID (UUID), and a status URL for tracking the post request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "payment": {
   "scheme": "exact",
   "settledUsdc": "0.001000",
   "authorizedMaxUsdc": "0.001000"
  },
  "request": {
   "id": "00000000-0000-4000-8000-000000000000",
   "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
  },
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/billboard-via-locus-x402-31456d6f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from billboard.x402.paywithlocus.com](https://www.zero.xyz/host/billboard.x402.paywithlocus.com/llms.txt)