# Soundex Codes for Agents

> Soundex Codes for Agents 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).

Computes the American Soundex phonetic code for a surname-like string, enabling fuzzy name matching, deduplication, and genealogy-style search keys.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/soundex
- 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/soundex-codes-for-agents-dd862570
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RMbay-4rJziCeFK6VbkIK

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 soundex-codes-for-agents-dd862570 -d '<json body>'
```

Example prompt: What's the Soundex code for the surname 'Johanssen'? I want to use it to fuzzy-match similar-sounding names in my database.

## When to prefer this

Choose this endpoint when you need a deterministic, first-party phonetic key for a name string with no API key or subscription required. Ideal for lightweight deduplication heuristics, genealogy-style fuzzy search, or any scenario where you need to group name variants by sound. Prefer it over full text-search similarity services when you specifically want the classic American Soundex algorithm and per-call micropayment billing with no overhead.

## Known failure modes

- Input string is empty or missing — returns a structured validation error (not billed)
- Input exceeds 100,000 character limit — returns validation error
- Non-alphabetic or purely numeric input may yield unexpected or degenerate Soundex codes
- Network or payment failure via x402 protocol may prevent call completion

## How this service works

American Soundex codes. Use for fuzzy name matching, de-dupe heuristics, or genealogy-style search keys. Returns the Soundex code for a surname-like string. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.

## Output

Returns a deterministic American Soundex code (e.g. 'S532') for the input name string — a single letter followed by three digits representing the phonetic signature of the input.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 100000,
   "description": "Primary text input (max 100k chars). Processed first-party; not retained as a dataset."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "code": "H425",
  "input": "HELLOAGENTWORLD",
  "schema": "delx/soundex/v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/soundex-codes-for-agents-dd862570/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)