# ONE Engine Pick-Keys

> ONE Engine Pick-Keys is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0011/call, status unknown (last checked 2026-10-02).

Filters a JSON object to only return the specified subset of keys, dropping all others.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/json/pick-keys?utm_source=zero.xyz
- Price: $0.0011/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-pick-keys-5293ef56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e9bL6ypSfP6Y1J5aC9ZnR

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-pick-keys-5293ef56 -d '<json body>'
```

Example prompt: From this object {"a":1,"b":2,"c":3,"d":4}, give me back only the keys 'a' and 'c' using the pick-keys utility.

## When to prefer this

Use this endpoint when you need a cheap, stateless, pay-per-call operation to filter a JSON object to a specific set of keys within an autonomous agent workflow — especially when you want to avoid spinning up local computation or when operating in a serverless/agent context using x402 micropayments on Base.

## Known failure modes

- If a requested key does not exist in the input object, it will be silently omitted from the result (no error thrown)
- Malformed input (non-object 'value' or non-array 'keys') may return an error or empty result
- Payment failure via x402 will prevent the call from completing
- Empty 'keys' array may return an empty object

## How this service works

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

## Output

A JSON object containing only the key-value pairs whose keys were specified in the 'keys' input array, with all other properties from the original object omitted.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "value": {
   "a": 1,
   "c": 3
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-pick-keys-5293ef56/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)