{"uid":"cap_XwH7pJoXk9rqLHvsUxyye","slug":"hmac-md5-base64url-encoder-b33974ad","name":"HMAC-MD5 Base64URL Encoder","description":"Call when an agent needs an HMAC-md5 of text with a caller-supplied key, encoded as base64url. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/hmac-md5-base64url first.","url":"https://agentshelf.syntexa.ch/v1/hmac-md5-base64url?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"key":{"type":"string","examples":["secret"],"maxLength":512,"minLength":1,"description":"HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored."},"text":{"type":"string","examples":["hello"],"maxLength":100000,"minLength":1,"description":"Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text."}}},"responseSchema":null,"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_1Ga1n-uhQta0aVAc8yH82","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 an HMAC-MD5 message authentication code of input text using a caller-supplied key and returns the result encoded as base64url.","exampleAgentPrompt":"Compute an HMAC-MD5 of the text 'hello world' using the secret key 'mysecretkey' and give me the result as base64url.","exampleUseCases":[{"title":"Webhook signature verification","prompt":"I need to sign the webhook payload '{\"event\":\"user.created\",\"id\":42}' with HMAC-MD5 using my secret key 'wh_secret_abc123' and get the result as base64url so I can compare it against the signature header."},{"title":"API request authentication token","prompt":"Generate an HMAC-MD5 of the string 'GET /api/orders/2024-05-20' using my API signing key 'k3y-x9z2' encoded as base64url — I need it to authenticate my request."},{"title":"Data integrity checksum for storage","prompt":"Compute an HMAC-MD5 base64url tag for the text 'invoice_id=9871&amount=250.00&currency=USD' using the key 'integrity_key_prod' so I can store it alongside the record for tamper detection."}],"resultDescription":"Returns a base64url-encoded HMAC-MD5 digest string — the message authentication code computed over the input text using the supplied key. No additional metadata; just the compact, URL-safe encoded MAC value.","failureModes":["Missing or empty 'key' field returns a validation error","Missing or empty 'text' field returns a validation error","Text exceeding 100,000 characters is rejected","Key exceeding 512 characters is rejected","Payment failure or insufficient USDC balance results in a 402 Payment Required response","Malformed JSON body returns a 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need a URL-safe (base64url) encoded HMAC-MD5 MAC — for example, when constructing webhook signatures, API authentication headers, or integrity tags that must be embedded in URLs or filenames without padding issues. Prefer the free sandbox endpoint POST /v1/sandbox/hmac-md5-base64url first if available. Use this paid endpoint when the sandbox is unavailable or when production guarantees are required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T06:47:36.347Z","isFirstParty":false,"canonicalSlug":"hmac-md5-base64url-encoder-b33974ad"}