{"uid":"cap__K0oqePAf2kFeUwLVU7EN","slug":"liquprop-api-7f1e3296","name":"LiquProp API - Get Sign-In Nonce","description":"Get a sign-in nonce for a wallet address","url":"https://api.relai.fi/relay/1776502063891/v1/auth/nonce/{address}","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"unknown","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","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_w9Nqfhshdc5TQ27z7RDA6","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a one-time nonce for wallet-based authentication (Sign-In with Ethereum / SIWE) for a given wallet address","exampleAgentPrompt":"I need to start the sign-in flow for my wallet address 0x1234abcd5678ef90... — can you get a nonce from LiquProp so I can sign it and complete authentication?","exampleUseCases":[{"title":"Onboard new user with wallet authentication","prompt":"I want to create an account using my Ethereum wallet. Can you get me a nonce from LiquProp that I can sign to prove I own this address and complete the signup?"},{"title":"Re-authenticate existing wallet holder","prompt":"My session expired and I need to log back in with my wallet 0x9876543210abcdef.... Can you grab a fresh nonce so I can sign it and regain access?"},{"title":"Verify wallet ownership for platform access","prompt":"Before I can access my portfolio on LiquProp, I need to verify this is really my wallet. Can you generate a sign-in challenge nonce that I can authenticate with?"}],"resultDescription":"A one-time nonce value that the wallet owner must sign to prove ownership of the address, completing the Sign-In with Ethereum (SIWE) authentication challenge.","failureModes":["Invalid or malformed wallet address returns error","Address not found or not registered may return 404","Network timeout or relay unavailability returns 5xx","Expired session or repeated nonce request may be rejected","Payment of 0.01 USDC not fulfilled returns 402"],"whenToPreferThis":"Use this endpoint when implementing wallet-based authentication (SIWE / Sign-In with Ethereum) for the LiquProp platform. Choose this over generic auth endpoints when the user needs to authenticate a specific Ethereum/Polygon wallet address and you need a server-generated nonce to prevent replay attacks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T02:25:03.061Z","isFirstParty":false}