# ONE Engine Text Analysis Tier 4

> ONE Engine Text Analysis Tier 4 is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0018/call, status unknown (last checked 2026-10-02).

Performs tier-4 text analysis on a given string, returning a structured result via a pay-per-call x402-gated API on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/text-analysis/t4?utm_source=zero.xyz
- Price: $0.0018/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-text-analysis-tier-4-0989e721
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A33WSKJWFRFzF_73Folbc

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 one-engine-text-analysis-tier-4-0989e721 -d '<json body>'
```

Example prompt: Can you run a tier-4 text analysis on this paragraph: 'The quarterly earnings exceeded expectations, driven by strong performance in cloud services and a 20% increase in enterprise subscriptions.'

## When to prefer this

Choose this endpoint when you need low-cost, per-call text analysis and are operating within an x402-enabled agent stack on Base. It is suitable for high-frequency, cost-sensitive pipelines where $0.0018 USDC per call is acceptable. Prefer this over heavier NLP services when the tier-4 output granularity is sufficient for your use case.

## Known failure modes

- Payment not provided or x402 handshake fails — returns 402 Payment Required
- Text field missing or empty — may return 400 Bad Request or empty result
- Text too long for processing — may be truncated or rejected
- Ambiguous or opaque tier-dependent output with minimal documentation
- Cloudflare Worker downtime — returns 5xx error

## How this service works

Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.

## Output

A JSON object containing the tier number (4) and a tier-dependent analysis result string. The exact nature of the result depends on the tier's analytical capabilities applied to the submitted text.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": 4,
  "result": "Tier-dependent output"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-analysis-tier-4-0989e721/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-search.one-engine.workers.dev](https://www.zero.xyz/host/one-search.one-engine.workers.dev/llms.txt)