{"uid":"cap_qvdOm7LgLWJUVUIMKTaYC","slug":"x402-hub-username-check-11d052d9","name":"X402 Hub Username Check","description":"63 paid API endpoints protected by x402 micropayments on Base","url":"https://x402-hub.vercel.app/api/username-check?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["query"],"properties":{"query":{"type":"string","description":"Query parameter for the API"}}},"responseSchema":{"type":"object","properties":{"data":{"type":"object","description":"Response data from upstream API"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rY7jr1M0eBDdqI7tEXjLc","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a given username is available or already taken, via a micropayment-gated API endpoint","exampleAgentPrompt":"Can you check if the username 'coolguy42' is available?","exampleUseCases":[{"title":"Pre-registration username check","prompt":"Before I sign up, can you check if the username 'starlightdev' is already taken?"},{"title":"Brand handle availability check","prompt":"I'm launching a new brand called 'NeonBrew' — can you check if that username is available so I can grab it?"},{"title":"Alternative username discovery","prompt":"Is 'pixelwolf' available as a username? I want to know before I try to register it."}],"resultDescription":"Returns an object containing data about the username status — typically whether the username is available or already in use, along with any relevant metadata returned by the upstream service.","failureModes":["Missing or empty query parameter returns a validation error","Username not found in the upstream system may return null or empty data","Upstream API downtime may cause 502 or timeout errors","Insufficient USDC balance or failed x402 micropayment results in 402 Payment Required","Malformed query string may return unexpected results"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-use username availability check without committing to a full identity platform subscription. It is ideal for agents that occasionally need to validate usernames on demand, paying only $0.05 USDC per check via Base blockchain micropayments. Prefer this over free username checkers when you need reliable, real-time results backed by a structured API with consistent response schemas.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:30:32.794Z","isFirstParty":false,"canonicalSlug":"x402-hub-username-check-11d052d9"}