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PennyRail Number Sum
x402
PennyRail Number Sum is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes the sum (total) of an array of numbers via a paid API endpoint
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the computed sum (total) of all numbers provided in the input array. The response schema is open-ended, likely including a field for the total or sum value.
Example use cases
Totaling invoice line items
“Sum up these invoice amounts for me: [120.50, 45.00, 89.99, 15.75] and tell me the grand total.”
Aggregating sensor readings
“I have a batch of sensor readings — [102, 98, 115, 107, 99] — can you add them all up to get the cumulative total?”
Calculating campaign budget spend
“Add up my campaign spend figures across channels: [3200, 1500, 800, 4100, 620] so I know the total spend.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/number.sum--total-numbersWhen to prefer
Use this endpoint when you need a simple, pay-per-call arithmetic sum of an array of numbers without hosting your own compute. It is particularly useful in agent workflows where you want a lightweight, on-demand computation step with a predictable micro-payment cost, rather than running local code or spinning up a full computation service.
Side effects
- Empty or missing input array returns an error
- Non-numeric values in the array may cause computation failure or be ignored
- Payment failure (402) if USDC balance is insufficient
- Malformed request body (missing 'input' key) returns a validation error
- Very large arrays may hit request size or timeout limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | array |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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