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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).
Accepts an array of numbers and returns their sum via a paid micropayment 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 of all numbers passed in the input array.
Example use cases
Totaling a shopping cart
“I have a list of item prices — 4.99, 12.50, 7.25, and 19.00 — can you add them all up and give me the total?”
Summing survey response scores
“I've got these survey scores: 8, 6, 9, 7, 10, 5 — can you compute the total so I can calculate the average?”
Aggregating daily sales figures
“Here are the daily sales numbers for the week: 1020, 850, 1340, 975, 1100, 630, 900 — what's the grand total?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/number.sum--sum-numbersWhen to prefer
Choose this endpoint when you need a simple, stateless numeric sum computed via a paid API call — useful in automated agent workflows where you want a verifiable, billable computation step, or when integrating arithmetic into a micropayment-based pipeline.
Side effects
- Empty or missing input array returns an error
- Non-numeric values in the array may cause a computation failure or be ignored
- Payment failure (402) if USDC micropayment is not correctly attached
- Malformed JSON body returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | array |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
Reviews
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