{"uid":"cap_RIntatjulxViE8lDjYdai","slug":"scriptmasterlabs-acp-x402-hmac-compute-api-cee44330","name":"ScriptMasterLabs ACP x402 HMAC Compute API","description":"Pay-per-call crypto, RWA, federal, SEC, and compliance APIs. Settled in USDC on Base via x402. Hyphen routes only (e.g. /x402/rwa-aggregates, /x402/gas-tracker).","url":"https://acp-x402-scriptmasterlabs.onrender.com/x402/hmac-compute?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"example":{}},"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_OLAN8RrvzeHS64XHel_vw","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 (Hash-based Message Authentication Code) for a given input, paid per-call via USDC on Base using the x402 protocol","exampleAgentPrompt":"Compute an HMAC for the message 'order-12345-confirmed' using ScriptMasterLabs' HMAC compute endpoint so I can sign this webhook payload securely.","exampleUseCases":[{"title":"Webhook signature verification","prompt":"I need to generate an HMAC signature for the payload 'user_id=42&event=purchase' so I can attach it to my outgoing webhook and the receiver can verify it's authentic."},{"title":"Secure API request signing","prompt":"Can you compute an HMAC for my API request body 'amount=500&currency=USD&timestamp=1718000000' so I can sign the call before sending it to a third-party financial service?"},{"title":"Compliance audit message authentication","prompt":"I need an HMAC digest generated for the string 'audit-log-entry-2024-06-10-txn-9981' to attach as a tamper-evident tag for our compliance records."}],"resultDescription":"Returns a computed HMAC value (digest/authentication code) for the provided input. The response is a JSON object containing the resulting hash or authentication code that can be used for message authentication, payload signing, or integrity verification.","failureModes":["Missing or malformed 'properties' input parameter returns an error or empty result","Payment not settled via x402 results in HTTP 402 Payment Required response","Service may be unavailable if the Render deployment is cold-started or sleeping","Invalid or unsupported HMAC algorithm parameters may return an error","Empty or null input string may produce undefined behavior"],"whenToPreferThis":"Choose this endpoint when you need a pay-per-call, crypto-native HMAC computation without provisioning your own signing infrastructure, especially in agentic workflows that already use x402/USDC micropayments on Base. It is well-suited for compliance-adjacent use cases (SEC, RWA, federal) where cryptographic message authentication is needed on-demand. Prefer this over a self-hosted solution when cost per call is more efficient than maintaining signing infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T00:39:43.684Z","isFirstParty":false,"canonicalSlug":"scriptmasterlabs-acp-x402-hmac-compute-api-cee44330"}