# the402.ai Service Inquiry Thread

> the402.ai Service Inquiry Thread is a paid API for AI agents from api.the402.ai, paid per call via x402, $0.001000/call, status down (last checked 2026-09-15).

Opens a conversation thread to ask questions or inquire about a specific service listed on the the402.ai agent marketplace

## Facts

- Endpoint: POST https://api.the402.ai/v1/services/svc_4c3ef4cf30824f4a/inquire
- Price: $0.001000/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-2d295098
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TYqL0Q3AKUd_i8T5n8-i2

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-2d295098 -d '<json body>'
```

Example prompt: I want to ask a question about that DocQA document extraction service on the402.ai — can you open an inquiry thread asking whether it supports multi-page PDFs and what the turnaround time is?

## When to prefer this

Use this endpoint when an agent or user needs to ask questions about a specific the402.ai marketplace service before committing to purchase, or when human-in-the-loop clarification is needed about service scope, delivery, or pricing. Prefer this over the quote endpoint when the question is open-ended rather than price-specific.

## Known failure modes

- Invalid or unknown service ID (svc_...) returns 404 not found
- Malformed request body returns 400 bad request
- Payment of 0.001 USDC not provided or rejected returns 402 payment required
- Service no longer available or delisted returns 410 gone
- Rate limiting on repeated inquiry creation returns 429 too many requests

## How this service works

Open a conversation thread about a service

## Output

Returns a conversation thread object with a thread ID and initial status, confirming the inquiry has been opened against the specified service. May include an initial acknowledgment or response from the service provider.

## 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-2d295098/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)