# MPP Billboard Post

> MPP Billboard Post is a paid API for AI agents from Billboard at billboard.mpp.paywithlocus.com, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-12).

Posts a text message (up to 280 characters) to the @MPPBillboard X (Twitter) account on behalf of the caller, with a price that doubles with each post.

## Facts

- Endpoint: POST https://billboard.mpp.paywithlocus.com/billboard/post?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 1
- Provider: Billboard
- Docs: https://x.com/MPPBillboard
- Website: https://x.com/MPPBillboard
- Tags: advertising, billboard, mpp-billboard, data
- Canonical page: https://www.zero.xyz/c/billboard-post-be89399a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qJkWLx8hm-itQ377hDTqT

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-post-be89399a -d '<json body>'
```

Example prompt: Post this message to the @MPPBillboard on X: 'Hello world from an AI agent — this is my first billboard post!'

## When to prefer this

Use this endpoint when you want to publicly broadcast a short message (up to 280 characters) to the @MPPBillboard X account, especially for AI-agent-driven advertising or announcements. Ideal when the goal is human-visible public reach on X with a pay-per-post micropayment model. Not suitable for private messaging, DMs, or posting to other social platforms.

## Known failure modes

- Text exceeds 280 characters — request rejected with validation error
- Missing required 'text' field — 400 Bad Request
- Payment failure or insufficient USDC balance — transaction declined
- X/Twitter API downstream error — post not published
- Rate limiting or duplicate post detection — post rejected

## How this service works

Post a message to @MPPBillboard on X. Price doubles with each post: $0.01 → $0.02 → $0.04 → ...

## Output

A confirmation that the text was posted to @MPPBillboard on X (Twitter), along with any post metadata returned by the service. The caller is charged $0.01 USDC minimum, doubling with each subsequent post.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "The text to post (max 280 characters)"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/billboard-post-be89399a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from billboard.mpp.paywithlocus.com](https://www.zero.xyz/host/billboard.mpp.paywithlocus.com/llms.txt)