# x402.tanship.dev Sentiment Analysis

> x402.tanship.dev Sentiment Analysis is a paid API for AI agents from x402.tanship.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).

Analyzes text sentiment using Cloudflare Workers AI, returning a positive/negative label with a confidence score

## Facts

- Endpoint: POST https://x402.tanship.dev/v1/ai/sentiment
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tanship-dev-sentiment-analysis-cfc919c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HUOXwLCPdSWgFiBUkhrxm

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-tanship-dev-sentiment-analysis-cfc919c1 -d '<json body>'
```

Example prompt: Classify this customer review as positive or negative and tell me the confidence score: 'The delivery was shockingly fast but the packaging was completely crushed when it arrived.'

## When to prefer this

Use this endpoint when you need fast, low-cost sentiment classification ($0.002 USDC per call) on individual text inputs without setting up your own NLP infrastructure. Ideal for agents processing customer feedback, social media posts, or review data on a per-item basis via the x402 micropayment protocol.

## Known failure modes

- Missing or empty input text returns a validation error
- Malformed JSON body causes a 400 Bad Request
- Payment not included or insufficient USDC triggers a 402 Payment Required
- Very short or ambiguous text may produce low-confidence scores
- Non-English text may produce unreliable results depending on model support

## How this service works

Payment-gated AI and browser automation API using the x402 protocol. All /v1/* endpoints require USDC payment on Base (eip155:8453) via x402 v2 exact scheme.

## Output

Returns a sentiment label (positive or negative) along with a numerical confidence score indicating how strongly the model classifies the text in that direction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tanship-dev-sentiment-analysis-cfc919c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.tanship.dev](https://www.zero.xyz/host/x402.tanship.dev/llms.txt)