{"uid":"cap_XfjoLKGqpGR8KcU7Tn5gl","slug":"hmac-ripemd160-base64-signing-64357c6e","name":"HMAC-RIPEMD160-Base64 Signing","description":"Call when an agent needs an HMAC-ripemd160 of text with a caller-supplied key, encoded as base64. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/hmac-ripemd160-base64 first.","url":"https://agentshelf.syntexa.ch/v1/hmac-ripemd160-base64?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":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_9YUCPvlvVq43vH7PVeEzb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes an HMAC-RIPEMD160 digest of input text using a caller-supplied key and returns it as a base64-encoded string.","exampleAgentPrompt":"Compute the HMAC-RIPEMD160 of the text 'Hello, world!' using the key 'my-secret-key' and give me the result as a base64 string.","exampleUseCases":[{"title":"Signing API payloads before dispatch","prompt":"I need to sign this JSON payload string '{\"order_id\":\"12345\",\"amount\":99.99}' with the key 'prod-secret-2024' using HMAC-RIPEMD160, and give me the base64 result so I can attach it as a signature header."},{"title":"Verifying message authenticity in a pipeline","prompt":"Take the message 'user:42:action:login' and compute its HMAC-RIPEMD160 with the key 'pipeline-auth-key', base64 encoded — I need to compare it against the token sent by the upstream service."},{"title":"Generating a keyed checksum for stored records","prompt":"Generate an HMAC-RIPEMD160 base64 checksum for the text 'record:9876:status:confirmed' using the secret key 'rec-signing-key' so I can store it alongside the record for integrity checks."}],"resultDescription":"Returns a base64-encoded HMAC-RIPEMD160 digest string computed from the provided text and key. The result is a compact, URL-safe-friendly representation of the keyed hash suitable for use as a signature, checksum, or authentication token.","failureModes":["Empty or missing 'key' field returns a validation error","Empty or missing 'text' field returns a validation error","'key' exceeding 512 characters is rejected","'text' exceeding 100,000 characters is rejected","Payment of $0.003 USDC not provided returns HTTP 402","Malformed JSON body returns a 400 error"],"whenToPreferThis":"Choose this endpoint when you specifically need the RIPEMD160 algorithm (rather than SHA-256 or SHA-512) for HMAC computation, particularly for compatibility with legacy systems, Bitcoin-ecosystem tooling, or protocols that mandate RIPEMD160 keyed hashing. It is ideal when you need the output in base64 format without additional transformation steps. Use the free sandbox endpoint (/v1/sandbox/hmac-ripemd160-base64) for testing before committing to the paid version.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:49:11.229Z","isFirstParty":false,"canonicalSlug":"hmac-ripemd160-base64-signing-64357c6e"}