# the402 Thread Verification

> the402 Thread Verification 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).

Verifies the status or integrity of a specific thread by ID on the the402 AI agent service marketplace

## Facts

- Endpoint: POST https://api.the402.ai/v1/threads/%7Bid%7D/verify
- 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-thread-verification-0b67799c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lL-rztc0NT6NGGnbaHLiy

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-thread-verification-0b67799c -d '<json body>'
```

Example prompt: Can you verify thread abc123xyz on the402 to confirm it's valid and check its current status?

## When to prefer this

Use this endpoint when you need to confirm the validity or current state of a specific thread on the the402 AI agent marketplace, particularly after initiating a service transaction or checking if a previously created thread is still active.

## Known failure modes

- Thread ID not found — returns error if the provided ID does not correspond to an existing thread
- Invalid ID format — returns validation error if the thread ID string is malformed
- Insufficient funds — x402 micropayment of $0.001 USDC may fail if balance is insufficient
- Unauthorized — missing or invalid payment credentials
- Network or service downtime on the402 platform

## 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

A JSON object indicating whether the specified thread is valid, its current status, or other verification details about the thread on the the402 marketplace.

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the402-thread-verification-0b67799c/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)