# the402.ai Thread Message Sender

> the402.ai Thread Message Sender 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).

Send a message to a specific thread on the402.ai platform using a thread ID

## Facts

- Endpoint: POST https://api.the402.ai/v1/threads/thread_a1b84c858a154601/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/api-the402-ai-162dbe6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__S7hECelhpwvVY6RnUDT4

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 api-the402-ai-162dbe6d -d '<json body>'
```

Example prompt: Send a message to thread ID thread_a1b84c858a154601 on the402.ai saying 'Hello, please process my request for analysis.'

## When to prefer this

Use this endpoint when you need to post a message to an existing thread on the402.ai platform and have a valid thread ID. Prefer this over creating a new thread when continuing an existing conversation or workflow.

## Known failure modes

- Missing or invalid thread ID returns 400 Bad Request
- Thread not found returns 404 Not Found
- Missing API key returns 401 Unauthorized
- Payment not processed returns 402 Payment Required
- Rate limiting may return 429 Too Many Requests

## How this service works

Send thread message (free with API key)

## Output

A confirmation that the message was posted to the specified thread, likely including the created message object or message ID and status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "id"
 ],
 "properties": {
  "id": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-the402-ai-162dbe6d/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)