# Delx ETag Match

> Delx ETag Match is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Compares two ETag validators (including weak ETags and If-None-Match lists) and returns a deterministic JSON result indicating whether they match

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/etag-match
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-etag-match-6772dbff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KOzN1c-rsTPlltMIfih-5

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-etag-match-6772dbff -d '<json body>'
```

Example prompt: Can you compare these two ETags and tell me if they match — the stored one is '"abc123"' and the incoming If-None-Match header value is '"abc123", "def456"'?

## When to prefer this

Use this endpoint when you need a stateless, deterministic, zero-side-effect ETag comparison without implementing the RFC 7232 matching logic yourself — especially for agent preflight checks before conditional HTTP requests, cache validation pipelines, or micro-utility workflows where correctness of weak vs strong ETag semantics matters.

## Known failure modes

- Malformed or missing etag input returns an error response
- Invalid ETag format (missing quotes or bad syntax) may produce unexpected results
- If-None-Match list with malformed entries may fail to parse correctly

## How this service works

Compare ETag validators including weak tags and If-None-Match lists — 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 alr…

## Output

Returns a deterministic JSON object indicating whether the provided ETag matches the comparison ETag or If-None-Match list, including handling for weak ETag comparison rules and multi-value match lists.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "etag": {
   "type": "string",
   "description": "Input field: etag."
  },
  "other": {
   "type": "string",
   "description": "Input field: other."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "mode": "list",
  "match": true,
  "schema": "delx/util-etag-match/v1",
  "weak_a": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-etag-match-6772dbff/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)