{"uid":"cap_B-EHBnPtGJ9F5jbqCnpgs","slug":"hmac-ripemd160-hex-digest-78f5dab3","name":"HMAC-RIPEMD160 Hex Digest","description":"Call when an agent needs an HMAC-ripemd160 of text with a caller-supplied key, encoded as hex. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/hmac-ripemd160-hex first.","url":"https://agentshelf.syntexa.ch/v1/hmac-ripemd160-hex?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":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1oVodUmvh_ZJg6AP_coZ6","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","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 for a given text using a caller-supplied key, returning the result as a lowercase hex string.","exampleAgentPrompt":"Compute the HMAC-RIPEMD160 of the text 'Hello, world!' using the key 'mysecretkey' and give me the result as a hex string.","exampleUseCases":[{"title":"API request signature verification","prompt":"I need to sign this API request body 'amount=100&currency=USD' with HMAC-RIPEMD160 using my secret key 'sk_prod_abc123' — give me the hex digest so I can include it as a signature header."},{"title":"Message integrity tagging pipeline","prompt":"For each outgoing message in my pipeline, compute an HMAC-RIPEMD160 hex tag using the key 'pipeline-secret-key' for the text 'order_id=9821 status=shipped' so I can attach it as a tamper-evident checksum."},{"title":"Blockchain-style keyed hash computation","prompt":"Can you generate the HMAC-RIPEMD160 hex digest of the string 'block:00042:prevhash:a1b2c3' with the signing key 'chainkey99'? I need it for a lightweight blockchain integrity check."}],"resultDescription":"A JSON response containing the HMAC-RIPEMD160 digest of the supplied text computed with the given key, returned as a lowercase hexadecimal string. No external network calls or LLM inference are involved — it is a pure cryptographic computation.","failureModes":["Missing or empty 'key' field returns a validation error","Missing or empty 'text' field returns a validation error","Text exceeding 100,000 characters rejected with a payload-too-large error","Key exceeding 512 characters rejected with a validation error","Payment failure or insufficient USDC balance results in 402 Payment Required","Malformed JSON body returns a 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you specifically need HMAC-RIPEMD160 (not SHA-256 or SHA-512 HMAC variants) as a keyed message authentication code, returned in hexadecimal. It is appropriate for legacy systems, cryptocurrency-adjacent workflows (RIPEMD160 is common in Bitcoin address derivation pipelines), or any protocol that mandates RIPEMD160 as the underlying hash. Prefer the free sandbox endpoint (/v1/sandbox/hmac-ripemd160-hex) for testing before committing to paid calls.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:45:58.841Z","isFirstParty":false,"canonicalSlug":"hmac-ripemd160-hex-digest-78f5dab3"}