{"uid":"cap_DVjcLkhk84ToZtqffS7G8","slug":"pennyrail-json-field-picker-8d44215b","name":"PennyRail JSON Field Picker","description":"Machine-readable settlement service","url":"https://pennyrail.vercel.app/api/p/nano/json.pick--pick-json-fields?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["input"],"properties":{"input":{"type":"object"}}},"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_HXiow0T0KVBLFZtz9Y1gc","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":"Selects and returns a subset of fields from a JSON object, filtering out unwanted keys","exampleAgentPrompt":"Take this JSON object and give me back only the 'name', 'email', and 'createdAt' fields, dropping everything else.","exampleUseCases":[{"title":"Trim API response to essential fields","prompt":"I'm getting back a huge JSON from an API with dozens of fields — can you pick out just 'id', 'status', and 'updatedAt' and discard the rest?"},{"title":"Extract user profile subset for display","prompt":"From this user record JSON, pull only 'firstName', 'lastName', and 'avatarUrl' so I can use them in the profile card."},{"title":"Filter event payload before logging","prompt":"Before we log this webhook payload, strip it down to just 'eventType', 'timestamp', and 'userId' — I don't want all the extra noise in the logs."}],"resultDescription":"A JSON object containing only the fields that were requested, with all other keys removed from the original input object.","failureModes":["Missing or malformed 'input' field returns an error","Requested field names not present in the input object may return empty or partial results","Non-object input type may cause processing failure","Payment failure (402) if USDC balance is insufficient"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call JSON field projection without standing up your own transformation logic. Best for agents that receive large, noisy JSON payloads and need to distill them to a smaller set of fields before passing data downstream.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T12:39:45.042Z","isFirstParty":false,"canonicalSlug":"pennyrail-json-field-picker-8d44215b"}