# Crypto Sentiment Tag API

> Crypto Sentiment Tag API is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-31).

Returns a sentiment tag for a given cryptocurrency via a pay-per-call x402 micropayment endpoint.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/crypto/sentiment-tag?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-sentiment-tag-api-1cfab01c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4np07pKK0esPu77iRTeA5

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 crypto-sentiment-tag-api-1cfab01c
```

Example prompt: What's the current sentiment tag for Bitcoin — is the market feeling bullish, bearish, or neutral on it right now?

## When to prefer this

Choose this endpoint when you need a quick, low-cost sentiment classification tag for a specific cryptocurrency and are operating in an x402-enabled micropayment environment. It is best suited for lightweight enrichment tasks — tagging a coin's sentiment before a decision, enriching a report, or checking market mood — rather than deep sentiment analysis with source attribution or historical trends.

## Known failure modes

- Missing or unrecognized coin symbol returns an empty or error result
- API returns generic success:true with empty result if coin is not indexed
- Payment failure via x402 protocol blocks access entirely
- Ambiguous coin name (e.g. 'BTC' vs 'Bitcoin') may yield no result if not matched exactly
- Rate limiting or server errors may return non-200 responses

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

A JSON object containing a sentiment tag or classification result for the specified cryptocurrency (e.g. bullish, bearish, neutral), returned with a success flag and a result payload.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "coin": {
       "type": "string",
       "default": null
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-sentiment-tag-api-1cfab01c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)