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number-ordinal
x402
number-ordinal is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Converts an integer into its ordinal string representation (e.g. 23 → '23rd')
Price / call$0.001
Success—
StatusUnknown
How this service works
Convert an integer to its English ordinal form (1st, 2nd, 3rd, 4th, 11th, 21st...).
Output
A JSON object with a single field 'ordinal' containing the ordinal string representation of the input integer, e.g. {"ordinal": "23rd"} — includes the appropriate suffix (st, nd, rd, or th) appended to the number.
Example use cases
Format ranking position in leaderboard
“I have a leaderboard and need to display a player's position as an ordinal — give me the ordinal form of 7 so I can show '7th place'.”
Display date day as ordinal
“I'm writing a formal invitation and need to say 'the 21st of June' — can you convert 21 into its ordinal string for me?”
Format step number in instructions
“My tutorial has 43 steps and I need to label the current one properly — what's the ordinal string for 43?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/number/ordinal?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a reliable, pay-per-call microservice to convert integers to ordinal strings without running your own formatting logic. Useful in agent pipelines where consistent ordinal formatting is needed across many numbers, or when the agent runtime lacks native ordinal formatting libraries.
Side effects
- Missing 'value' parameter returns an error or unexpected result
- Non-integer input may be rejected or produce malformed output
- Very large integers may not be supported
- Negative integers may not produce valid ordinals
- Payment failure (402) if USDC balance is insufficient on Base
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| value | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"ordinal": "23rd"
}
}Tags
x402
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