{"uid":"cap_Trr172zX4xG7xEM6zYL7q","slug":"bot-bazaar-webhook-hmac-sha256-signature-verifier-07363d73","name":"Bot Bazaar Webhook HMAC-SHA256 Signature Verifier","description":"Compute and verify a timestamped HMAC-SHA256 webhook signature (timestamp.payload) for constant-time webhook authentication.","url":"https://bot-bazaar.fly.dev/v1/x402/webhook-hmac-check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"timestamp":{"type":"string","description":"Unix timestamp string used in signature"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_MRLCtkIIVHoFH1197-ILz","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes and verifies a timestamped HMAC-SHA256 webhook signature (timestamp.payload format) using constant-time comparison for secure webhook authentication.","exampleAgentPrompt":"Can you verify the HMAC-SHA256 webhook signature for the incoming request with Unix timestamp '1716300000' to make sure it's authentic and hasn't been tampered with?","exampleUseCases":[{"title":"Authenticate incoming payment webhook","prompt":"I just received a webhook from our payment processor — can you verify the HMAC-SHA256 signature using timestamp '1716300000' to confirm it's legitimate before I process the payment event?"},{"title":"Guard against webhook replay attacks","prompt":"Check whether this webhook request with timestamp '1716298500' has a valid HMAC-SHA256 signature so I can reject it if it looks like a replay attack."},{"title":"Validate webhook before triggering automation","prompt":"Before I trigger our order fulfillment workflow, verify the HMAC-SHA256 webhook signature with Unix timestamp '1716301200' to make sure the request actually came from our trusted source."}],"resultDescription":"Returns whether the provided HMAC-SHA256 webhook signature is valid, computed as timestamp.payload using constant-time comparison to prevent timing attacks. Includes the computed signature and a pass/fail verification result.","failureModes":["Missing or malformed timestamp query parameter returns an error","Invalid or expired timestamp outside acceptable skew window may be rejected","Incorrect HMAC secret produces a signature mismatch and fails verification","Malformed or missing payload causes signature computation to fail","Network timeout or service unavailability on fly.dev infrastructure"],"whenToPreferThis":"Choose this endpoint when you need to securely verify incoming webhook authenticity using HMAC-SHA256 with a timestamp prefix (timestamp.payload format) and require constant-time comparison to prevent timing oracle attacks. Ideal for x402 payment webhooks or any webhook source that uses shared-secret HMAC signing with replay protection via timestamps.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:07:12.543Z","isFirstParty":false,"canonicalSlug":"bot-bazaar-webhook-hmac-sha256-signature-verifier-07363d73"}