{"uid":"cap_70oaiODMWY96w4I5ICb-r","slug":"fastapi-online-cryptographic-hash-generator-8c884d35","name":"fastapi.online — Cryptographic Hash Generator","description":"Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.","url":"https://api.fastapi.online/hash","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"text":{"type":"string","maxLength":100000,"minLength":1},"encoding":{"enum":["hex","base64"],"type":"string"},"algorithm":{"enum":["md5","sha1","sha256","sha512"],"type":"string"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0005","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":"$0.0005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_5bjhQNSshKSUM2fhZ4egI","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes a cryptographic hash (MD5, SHA1, SHA256, or SHA512) of input text, returning the digest in hex or base64 encoding","exampleAgentPrompt":"Hash this string using SHA256 and give me the result in hex: 'Hello, World!'","exampleUseCases":[{"title":"File integrity verification checksum","prompt":"Compute the SHA512 hex hash of this file's text content so I can compare it against the checksum the publisher provided: 'The quick brown fox jumps over the lazy dog'"},{"title":"Deduplication key generation","prompt":"Generate an MD5 hash in hex for this product description so I can use it as a deduplication key: 'Wireless noise-cancelling headphones, black, model XB900N'"},{"title":"API request signing digest","prompt":"I need a SHA256 base64 digest of this payload string to sign my API request: '{\"user_id\":\"u_12345\",\"action\":\"transfer\",\"amount\":100}'"}],"resultDescription":"Returns a hash digest string of the input text computed using the specified algorithm (md5, sha1, sha256, or sha512), encoded as either hex or base64. The response is a deterministic, fixed-length string corresponding to the chosen algorithm's output size.","failureModes":["Text input missing or empty — returns 422 validation error","Algorithm not one of md5/sha1/sha256/sha512 — returns 422 enum validation error","Encoding not 'hex' or 'base64' — returns 422 enum validation error","Text exceeds 100,000 character limit — returns 422 with length constraint error","Payment not included or insufficient — returns 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when you need a quick, pay-per-call cryptographic hash with no signup required and crypto payment support. It is ideal for agents that need on-demand hashing without managing a local library or maintaining an API subscription. Supports the four most common hash algorithms and both popular output encodings in a single endpoint.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:45:21.991Z","isFirstParty":false}