# Delx Dedupe List

> Delx Dedupe List is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Removes duplicate values from an array while preserving the original first-seen insertion order, returning a deduplicated list as JSON.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/dedupe-list
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-dedupe-list-28c448e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Clm4t_QF_kuz_M6PrJFb6

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 delx-dedupe-list-28c448e8 -d '<json body>'
```

Example prompt: Deduplicate this list for me and preserve the order I gave them in: ["apple", "banana", "apple", "cherry", "banana", "date"].

## When to prefer this

Choose this endpoint when you need a simple, deterministic, stateless deduplication of an array with guaranteed first-seen order preservation, especially in agent preflight steps or lightweight pipeline cleanup tasks where you don't want to implement dedup logic yourself. It is ideal for micro-utility use cases where cost ($0.001 USDC) and latency matter more than complex dedup strategies. Prefer alternatives if you need fuzzy/semantic deduplication, deduplication by a specific key in objects, or dedup logic embedded in a larger data processing pipeline.

## Known failure modes

- Empty array input returns an empty array without error
- Non-array input for the items field may return a validation error
- Malformed JSON request body returns a 400-level error
- Payment not included or insufficient USDC value returns a 402 Payment Required response
- Very large arrays may hit payload size limits

## How this service works

Deduplicate a list while preserving first-seen order — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that already converted…

## Output

Returns a deterministic JSON object containing the deduplicated array with all duplicate entries removed and first-seen insertion order preserved. The result is machine-readable and stateless — no input is retained after the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "items": {
   "type": "array",
   "description": "Input field: items."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 3,
  "items": [
   "a",
   "b",
   "c"
  ],
  "schema": "delx/util-dedupe-list/v1",
  "removed": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-dedupe-list-28c448e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)