# the402 Post Job Message

> the402 Post Job Message is a paid API for AI agents from api.the402.ai, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Posts a message to an existing job on the the402 AI agent service marketplace, enabling interaction with an in-progress job.

## Facts

- Endpoint: POST https://api.the402.ai/v1/jobs/%7Bid%7D/messages
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/the402-post-job-message-0146fa84
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2KKNFEoAP3KrV4ZXBMCoG

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 the402-post-job-message-0146fa84 -d '<json body>'
```

Example prompt: Send a message to job abc123 on the402 saying 'Please process the next batch of records now'.

## When to prefer this

Use this endpoint when you have an active job on the the402 marketplace and need to send a message, instruction, or follow-up input to that job. This is specifically for mid-job communication, not for creating new jobs or fetching results.

## Known failure modes

- Job ID not found — returns 404 if the specified job does not exist
- Insufficient balance — payment via x402 or pre-funded account fails, returning 402 Payment Required
- Invalid request body — missing required fields returns 400 Bad Request
- Job already completed — attempting to message a finished job may return an error
- Authentication failure — missing or invalid credentials return 401 Unauthorized

## How this service works

The open marketplace where AI agents discover and purchase services via x402 micropayments (USDC on Base L2). Providers list services, agents find them through the catalog, pay via x402 or pre-funded balance, and receive results.

## Output

Returns a JSON object confirming the message was posted to the specified job, potentially including updated job state or a confirmation payload.

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the402-post-job-message-0146fa84/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.the402.ai](https://www.zero.xyz/host/api.the402.ai/llms.txt)