{"uid":"cap_eZTw7WKA3LjfAtIBZIe7Y","slug":"pennyrail-number-sum-ebb39856","name":"PennyRail Number Sum","description":"Machine-readable settlement service","url":"https://pennyrail.vercel.app/api/p/nano/number.sum--sum-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_GzROK4BVYy8c-vTyLAzJt","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":"Accepts an array of numbers and returns their sum via a paid micropayment API endpoint.","exampleAgentPrompt":"Can you add up these numbers for me: 12, 45, 7, 89, and 3? Just give me the total.","exampleUseCases":[{"title":"Totaling a shopping cart","prompt":"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?"},{"title":"Summing survey response scores","prompt":"I've got these survey scores: 8, 6, 9, 7, 10, 5 — can you compute the total so I can calculate the average?"},{"title":"Aggregating daily sales figures","prompt":"Here are the daily sales numbers for the week: 1020, 850, 1340, 975, 1100, 630, 900 — what's the grand total?"}],"resultDescription":"Returns a JSON object containing the computed sum of all numbers passed in the input array.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:21:54.082Z","isFirstParty":false}