{"uid":"cap_EY7C8nical-30SXy6f-rg","slug":"bot-bazaar-eip-3009-nonce-collision-check-b228def2","name":"Bot Bazaar EIP-3009 Nonce Collision Check","description":"Validate a 32-byte hex EIP-3009 authorization nonce for bit entropy, sequential/zero-padding traps, and replay safety.","url":"https://bot-bazaar.fly.dev/v1/x402/nonce-collision-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":{"nonce":{"type":"string","description":"32-byte hex nonce (0x + 64 hex)"}}}},"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_YxC7i3dktBzNW3q7CLul4","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":"Validates a 32-byte hex EIP-3009 authorization nonce for bit entropy, sequential/zero-padding traps, and replay safety.","exampleAgentPrompt":"Can you check whether this nonce is safe to use in an EIP-3009 authorization — I want to make sure it has strong entropy and won't trigger any sequential or zero-padding traps: 0x3a9f1c8e7b2d04f56a1e8c3d9b7042f1a6e3c8d27b4f9a1e5c3d8b7042f96a1?","exampleUseCases":[{"title":"Pre-signing nonce safety check","prompt":"Before I sign this EIP-3009 permit, can you validate that the nonce 0x3a9f1c8e7b2d04f56a1e8c3d9b7042f1a6e3c8d27b4f9a1e5c3d8b7042f96a1 has enough entropy and isn't vulnerable to replay or collision attacks?"},{"title":"Detecting weak sequential nonces","prompt":"I generated a nonce for a meta-transaction but I'm worried it might be sequential — can you run it through the EIP-3009 nonce collision check to see if it hits any sequential or zero-padding traps? The nonce is 0x0000000000000000000000000000000000000000000000000000000000000042."},{"title":"Agent payment pipeline nonce auditing","prompt":"My AI agent is about to submit a batch of EIP-3009 authorizations — can you validate this nonce for replay safety and bit entropy before it goes on-chain: 0xf4a1b2c3d4e5f67890abcdef1234567890abcdef1234567890abcdef12345678?"}],"resultDescription":"Returns an assessment of the provided 32-byte hex nonce including: bit entropy score, detection of sequential or zero-padded patterns that indicate weak randomness, and replay safety classification — helping agents determine whether the nonce is safe to use in an EIP-3009 authorization flow.","failureModes":["Nonce not provided or malformed (missing 0x prefix, wrong length) — likely returns a validation error","Nonce is all zeros or trivially sequential — flagged as unsafe but not an API error","Service unavailable on fly.dev instance — network timeout or 5xx","Non-hex characters in nonce string — input rejection error"],"whenToPreferThis":"Choose this endpoint when building EIP-3009 meta-transaction flows on Base or EVM chains and you need to programmatically verify that a generated nonce is cryptographically sound before signing. Particularly valuable for AI agent payment pipelines where nonces are generated automatically and must not be weak, sequential, or reused. Prefer this over ad-hoc entropy checks when you need structured replay-safety signals and zero-padding trap detection in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:07:23.538Z","isFirstParty":false,"canonicalSlug":"bot-bazaar-eip-3009-nonce-collision-check-b228def2"}