# x402 Agent Economy Lab – Sentiment Analysis (USDC)

> x402 Agent Economy Lab – Sentiment Analysis (USDC) is a paid API for AI agents from rqjzcd-ip-209-115-177-214.tunnelmole.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).

Analyzes the sentiment of a given text string and returns a sentiment classification, paid per call in real USDC on Base mainnet via x402.

## Facts

- Endpoint: POST https://rqjzcd-ip-209-115-177-214.tunnelmole.net/v1/sentiment
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-agent-economy-lab-sentiment-analysis-usdc-38395638
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZOVfH-jhSHqRVb1J3EZPw

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 x402-agent-economy-lab-sentiment-analysis-usdc-38395638 -d '<json body>'
```

Example prompt: Can you analyze the sentiment of this customer review: 'The product arrived quickly but the packaging was damaged and support was unhelpful' — I need to know if it's positive, negative, or neutral.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call sentiment classification that settles in real USDC on Base mainnet — ideal for autonomous AI agents with crypto wallets that need to avoid subscription billing. Prefer this over subscription NLP APIs when you want zero upfront commitment and machine-to-machine micropayment flows via x402.

## Known failure modes

- 402 Payment Required if USDC wallet is not funded or x402 payment header is missing
- Empty or missing 'text' field returns a validation error
- Network timeout if the tunnelmole tunnel is down or unreachable
- Malformed JSON body returns a 400 Bad Request
- Insufficient USDC balance on Base mainnet blocks the request

## How this service works

Machine-payable NLP micro-services: sentiment, entity extraction, summarization, report, batch. Paid per call in REAL USDC on Base mainnet.

## Output

Returns a sentiment classification (e.g. positive, negative, neutral) and likely a confidence score or polarity value for the submitted text. Payment of $0.001 USDC is settled on Base mainnet via x402 protocol before or alongside the response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-agent-economy-lab-sentiment-analysis-usdc-38395638/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rqjzcd-ip-209-115-177-214.tunnelmole.net](https://www.zero.xyz/host/rqjzcd-ip-209-115-177-214.tunnelmole.net/llms.txt)