{"uid":"cap_-MA7Tp4pfvEtfEuZA3_in","slug":"neynar-farcaster-user-registration-76929a6a","name":"Neynar Farcaster User Registration","description":"Complete Farcaster developer platform","url":"https://api.neynar.com/v2/farcaster/user/","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.0001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Vl37iHc0xoHHT6wZJybOR","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0001","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Creates or registers a new Farcaster user account via the Neynar developer platform","exampleAgentPrompt":"Create a new Farcaster user account for my app user with the username 'alice_web3', display name 'Alice Smith', and bio 'building in web3' — use my Neynar-managed signer.","exampleUseCases":null,"resultDescription":"Returns the newly created Farcaster user object including the assigned FID (Farcaster ID), username, display name, profile metadata, and signer UUID that can be used to perform actions on behalf of the user.","failureModes":["Username already taken — 409 conflict returned","Invalid or missing Ethereum custody address — 400 bad request","Farcaster network registration failure — 503 service unavailable","Insufficient payment or x402 payment not processed — 402 payment required","Rate limit exceeded — 429 too many requests","Invalid API key or unauthorized — 401 unauthorized"],"whenToPreferThis":"Use this endpoint when you need to programmatically create a new Farcaster user account — particularly for apps that onboard users to Farcaster at scale, managed account flows, or when building Farcaster-native applications that require user registration via Neynar's managed signer infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:31:17.317Z","isFirstParty":false}