{"uid":"cap_3QHTOXqrjEozEYQM2nE3Y","slug":"pennyrail-number-percent-change-f0fe92b2","name":"PennyRail Number Percent Change","description":"Machine-readable settlement service","url":"https://pennyrail.vercel.app/api/f/number.percent-change","method":"POST","headers":{},"bodySchema":{"type":"object","required":["input"],"properties":{"input":{"type":"object","description":"{from,to}"}}},"responseSchema":{"type":"object","required":["operation","result"],"properties":{"result":{},"operation":{"type":"string"}},"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_6R55euB0D-yy2LxI6564f","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 percent change between two numeric values, returning the operation name and result","exampleAgentPrompt":"What's the percent change from 250 to 315?","exampleUseCases":[{"title":"Track monthly revenue growth","prompt":"Revenue went from $42,000 last month to $57,500 this month — what's the percent change?"},{"title":"Monitor stock price movement","prompt":"A stock was at 128.50 yesterday and closed at 141.20 today. Can you calculate the percent change?"},{"title":"Measure user count growth","prompt":"We had 8,400 active users last quarter and now have 11,050. What's the percentage change?"}],"resultDescription":"Returns a JSON object with an 'operation' string identifying the computation performed and a 'result' field containing the calculated percent change value (typically a decimal or percentage number).","failureModes":["Missing 'from' or 'to' fields in the input object returns a validation error","Division by zero if 'from' value is 0 (percent change is undefined)","Non-numeric inputs may cause computation failure","Payment failure via x402 protocol results in 402 response before computation occurs"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call computation of percent change between two numbers without setting up local math logic. Ideal for AI agents that need on-demand arithmetic in pipelines where installing a math library is impractical, or when traceability of the operation name alongside the result is useful.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:40:29.165Z","isFirstParty":false}