# Delx Ordinal

> Delx Ordinal 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).

Converts an integer into its English ordinal string representation (e.g. 1→1st, 2→2nd, 3→3rd).

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/ordinal
- 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-ordinal-3cd5fd0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s4KfLqQQoy1N0vW_dVRbq

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-ordinal-3cd5fd0f -d '<json body>'
```

Example prompt: Format the number 42 as an English ordinal string for me — like 1st, 2nd, 3rd.

## When to prefer this

Choose this endpoint when you need a simple, reliable, zero-dependency ordinal formatter for agent UIs, leaderboards, step labels, or ranked lists and want a micropayment-gated, stateless operation with no API key management. Prefer it over custom code when building agents that need consistent English ordinal formatting without maintaining local logic.

## Known failure modes

- Non-integer input returns a validation error
- Missing 'n' field causes a bad request response
- Very large integers may exceed expected formatting bounds
- Payment authorization failure via x402 blocks the request

## How this service works

Format an integer as an English ordinal (1st, 2nd, 3rd…). Call when you need human-facing ranks or step labels for agent UIs. Returns ordinal string and n for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

## Output

Returns a JSON object containing the ordinal string (e.g. '42nd') and the original integer n, with no external network calls or data retention.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "n": {
   "type": "integer",
   "description": "Input field: n."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "n": 21,
  "schema": "delx/util-ordinal/v1",
  "ordinal": "21st"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-ordinal-3cd5fd0f/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)