{"uid":"cap_WbsIUBxVd3ZhG-mIAZcD9","slug":"hmac-ripemd160-base64url-signer-267b75d5","name":"HMAC-RIPEMD160 Base64URL Signer","description":"Call when an agent needs an HMAC-ripemd160 of text with a caller-supplied key, encoded as base64url. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/hmac-ripemd160-base64url first.","url":"https://agentshelf.syntexa.ch/v1/hmac-ripemd160-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":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_XJ_JRLutwxhFPDYvM6NFA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","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 message authentication code over text using a caller-supplied key, returning the result encoded as base64url.","exampleAgentPrompt":"Compute the HMAC-RIPEMD160 of the text 'hello world' using the key 'mysecretkey' and give me the result as a base64url string.","exampleUseCases":[{"title":"Message integrity verification token","prompt":"I need to authenticate this API payload 'user_id=42&action=transfer&amount=100' before sending it — can you generate an HMAC-RIPEMD160 of that string using the key 'webhook-secret-abc' and return it as base64url so I can attach it as a signature header?"},{"title":"Keyed hash for blockchain data signing","prompt":"Generate an HMAC-RIPEMD160 digest of the raw transaction string 'tx:0xdeadbeef:1700000000' with the key 'chain-node-key-99' encoded as base64url — I need it for a legacy crypto protocol that requires RIPEMD160-based MACs."},{"title":"File checksum with shared secret","prompt":"Can you compute the HMAC-RIPEMD160 of this file content 'Invoice #4521: $3,200.00 due 2024-12-01' using the shared key 'finance-hmac-key' and give me the base64url result so I can store it alongside the document for integrity checking?"}],"resultDescription":"A JSON response containing the base64url-encoded HMAC-RIPEMD160 digest computed from the provided text and key. The result is a compact, URL-safe string representing the 160-bit keyed hash.","failureModes":["Empty or missing key field returns validation error","Empty or missing text field returns validation error","Text exceeding 100,000 characters returns payload-too-large error","Key exceeding 512 characters returns validation error","Payment not provided or insufficient returns HTTP 402","Malformed JSON body returns 400 bad request"],"whenToPreferThis":"Choose this endpoint when you specifically need HMAC-RIPEMD160 (not SHA-256 or MD5) in base64url encoding — common in legacy cryptographic protocols, certain blockchain systems, or when an external system mandates RIPEMD160-based MACs. Prefer the free sandbox POST /v1/sandbox/hmac-ripemd160-base64url endpoint for testing before committing to the paid call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:49:53.377Z","isFirstParty":false,"canonicalSlug":"hmac-ripemd160-base64url-signer-267b75d5"}