{"uid":"cap_urR7u99RD7uiG60r2kSfu","slug":"pennyrail-number-sum-cc9b119c","name":"PennyRail Number Sum","description":"Machine-readable settlement service","url":"https://pennyrail.vercel.app/api/p/nano/number.sum--total-numbers","method":"POST","headers":{},"bodySchema":{"type":"object","required":["input"],"properties":{"input":{"type":"array"}}},"responseSchema":{"type":"object","additionalProperties":true},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_6bUTA5LEjNaI7CcGOv5Ns","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the sum (total) of an array of numbers via a paid API endpoint","exampleAgentPrompt":"Add up all the numbers in this list for me: [4, 17, 8, 23, 5] and give me the total.","exampleUseCases":[{"title":"Totaling invoice line items","prompt":"Sum up these invoice amounts for me: [120.50, 45.00, 89.99, 15.75] and tell me the grand total."},{"title":"Aggregating sensor readings","prompt":"I have a batch of sensor readings — [102, 98, 115, 107, 99] — can you add them all up to get the cumulative total?"},{"title":"Calculating campaign budget spend","prompt":"Add up my campaign spend figures across channels: [3200, 1500, 800, 4100, 620] so I know the total spend."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:05:35.882Z","isFirstParty":false}