# ONE Engine Drop-Head Array Processor (Tier 8, p=1)

> ONE Engine Drop-Head Array Processor (Tier 8, p=1) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0035/call, status unknown (last checked 2026-10-13).

Removes the first item from a JSON array with Tier 8 diagnostic detail level

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v9/array-process/drop-head/p1/t8?utm_source=zero.xyz
- Price: $0.0035/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-drop-head-array-processor-tier-8-p-1-a8a6e037
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OCmjOzW9-kEeO14Xfa7kY

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-drop-head-array-processor-tier-8-p-1-a8a6e037 -d '<json body>'
```

Example prompt: Take this JSON array ["alpha","beta","gamma","delta"] and drop the first 1 item from the front, using Tier 8 diagnostics so I get the richest available processing detail back.

## When to prefer this

Choose this endpoint when you need a deterministic, pay-per-call JSON array head-drop operation with rich Tier 8 diagnostic output — particularly useful in agent workflows where observability into the transformation is important and you want detailed metadata about the operation rather than just the transformed array.

## Known failure modes

- Empty array input returns error or unchanged empty array
- Malformed JSON body causes parse error response
- Non-array JSON input rejected with type error
- Network timeout on Workers edge
- Payment failure via x402 blocks request with 402 status

## How this service works

Deterministic JSON array processing utility: Drop first array items; parameter=1. Tier 8/10 provides progressively richer diagnostics.

## Output

Returns the input JSON array with the first item removed, along with Tier 8 progressive diagnostics including processing metadata, drop confirmation, original and resulting array details, and richer diagnostic fields compared to lower tiers.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-drop-head-array-processor-tier-8-p-1-a8a6e037/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)