# ONE Engine JSON Analysis Pack Tier 4

> ONE Engine JSON Analysis Pack 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 JSON analysis on a submitted value, returning structured analytical output via a low-cost pay-per-call x402 micropayment API.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/json-analysis-pack/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-json-analysis-pack-tier-4-3c8f93f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KwFhmrxtdO76uDWkrGbJv

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-json-analysis-pack-tier-4-3c8f93f5 -d '<json body>'
```

Example prompt: Run a tier-4 JSON analysis on this value using ONE Engine's analysis pack: {"name": "Alice", "score": 42, "active": true} — I want the structured t4 result back.

## When to prefer this

Choose this endpoint when you need low-cost, per-call JSON analysis without committing to a subscription, especially in autonomous agent pipelines that can pay via x402 on Base. Prefer it over heavier analytics services when the payload is a single JSON value and cost-per-call matters. Best suited for agents that process many small, discrete values rather than large batch datasets.

## Known failure modes

- Payment failure: x402 payment not provided or insufficient USDC, resulting in 402 Payment Required
- Invalid input: missing or malformed 'value' field in the request body
- Tier mismatch: calling the wrong tier endpoint returns results for that tier, not the expected one
- Service unavailability: Cloudflare Worker downtime may return 503 or timeout

## How this service works

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

## Output

Returns a JSON object containing a 'tier' field (set to 4) and a 'result' field with tier-dependent analysis output derived from the submitted value.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "value": {}
 }
}
```

## 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-json-analysis-pack-tier-4-3c8f93f5/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)