{"uid":"cap_bFFruZ5tGDj1ZY4EAFQAk","slug":"delx-base64-size-estimate-f5ad6e44","name":"Delx Base64 Size Estimate","description":"Estimate decoded byte size of a base64 string without full decode — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that alrea…","url":"https://api.delx.ai/api/v1/x402/base64-size-estimate","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"base64":{"type":"string","description":"Input field: base64."}}},"responseSchema":{"type":"json","example":{"ok":true,"schema":"delx/util-base64-size-estimate/v1","padding":1,"encoded_chars":8,"decoded_bytes_estimate":5}},"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_e3MAEyjIiy1vJh09Ugo-f","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":"Estimates the decoded byte size of a base64-encoded string without performing a full decode, returning a deterministic byte count in JSON","exampleAgentPrompt":"Before I decode this base64 string, can you estimate how many bytes it will be when decoded? Here's the value: 'SGVsbG8gV29ybGQhIFRoaXMgaXMgYSB0ZXN0Lg=='","exampleUseCases":[{"title":"Preflight payload size check","prompt":"I'm about to decode this base64 blob and store it, but I want to make sure it won't exceed my 1MB limit first — can you estimate the decoded byte size without fully decoding it? The string is 'SGVsbG8gV29ybGQh...'"},{"title":"API response size budgeting","prompt":"Before I pipe this base64-encoded API response into my processing pipeline, estimate how large it'll be decoded so I know whether to batch it or handle it inline: 'dGhpcyBpcyBhIHRlc3QgcGF5bG9hZA=='"},{"title":"Memory budget pre-check for agent","prompt":"My agent is about to decode several base64 strings and I need to know the total memory footprint in advance — can you estimate the decoded byte size of this one first: 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXo='"}],"resultDescription":"A JSON object containing the estimated decoded byte size of the provided base64 string, computed deterministically without performing a full decode. The result is advisory and returned as a machine-readable numeric value representing bytes.","failureModes":["Invalid or malformed base64 string may result in an error or inaccurate estimate","Empty input string returns zero or an error response","Base64 strings with incorrect padding may produce unreliable size estimates","Payment failure via x402 will prevent execution and return a 402 response"],"whenToPreferThis":"Choose this endpoint when you need a fast, cheap, stateless estimate of decoded base64 byte size without the overhead of a full decode — ideal for preflight checks, memory budgeting, or size validation before committing to a full decode operation. Prefer this over decoding the string yourself when operating in constrained environments or when you want a deterministic, machine-readable result at minimal cost ($0.001 USDC).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:51:38.031Z","isFirstParty":false}