{"id":"2a55b05b-637c-43de-93b9-a633e57b351f","shortId":"DW3tYX","kind":"x402","title":"Query QNT wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Query QNT wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the wallet balance for QNT (Quant) tokens. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all gated via the x402 payment protocol. The endpoint accepts POST requests and charges $0.02 per call, settled in USDC on the Base network. No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's landing page advertises a wide catalog spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all at a flat $0.02 per request. This specific endpoint (`/api/v1/wallet/QNT/balance`) falls under the Finance & Web3 category. The x402 challenge confirms the endpoint is live, returning a 402 with an \"exact\" payment scheme requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all resolve to a \"Connect wallet\" stub with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact data returned (e.g., which chain's QNT balance, what fields are included) is unknown and must be discovered by making a paid call.","tags":[],"capabilities":["wallet-balance-query","qnt-token","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["QNT balance","Quant token balance","wallet balance API","crypto balance check","token balance lookup","x402 crypto API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' stub","No OpenAPI or output schema provided; response format is unknown","Example request body is inferred (address field) and may not be accurate","The broader lowpaymentfee.com catalog lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no response schema, and no example responses. The actual behavior of this endpoint is almost entirely 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'/api/v1/wallet/qnt/balance':128 '/docs':178 '/pricing':179 '/readme':182 '0.02':11,24,69,122,161 '000':155 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':170 '20':154 '402':145 '6':165 'QNT balance' 'Quant token balance' 'accept':64 'account':83 'address':169 'advertis':105 'ai/ml':112 'analyt':111 'api':51,80 'attach':88 'avail':207 'balanc':4,17,34,217 'base':9,22,77,156,172 'base-network' 'broader':44 'call':50,71,232 'caller':86 'catalog':108 'categori':134 'chain':214 'challeng':137 'charg':68 'confirm':138 'connect':188 'content':194 'crypto balance check' 'data':110,210 'decim':166 'discov':227 'document':173 'e.g':212 'endpoint':28,63,127,140 'exact':148,209 'exampl':205 'extrem':175 'fall':129 'field':219 'financ':132 'finance/web3':114 'flat':121 'gate':56 'given':162 'header':93 'i.e':160 'includ':221 'infer':113 'infrastructur':116 'key':81 'land':103 'live':142 'lowpaymentfee' 'lowpaymentfee.com':30,54 'make':229 'micropay':7,20 'must':225 'network':78 'no-api-key' 'offer':52 'openapi':198 'page':104,183 'paid':167,231 'part':41 'pay':48 'pay-per-cal':47 'pay-per-request' 'payload':206 'payment':60,92,98,149 'per':12,25,49,70,123 'post':65 'proof':99 'protocol':61 'provid':101 'qnt':2,15,36,216 'qnt-token' 'quant':37 'queri':1,14 'request':13,26,66,124 'request/response':201 'requir':85,151 'resolv':185 'return':31,143,211 'schema':202 'scheme':150 'settl':72 'simpli':87 'span':109 'spars':176 'spec':199 'specif':126 'stub':190 'suit':45 'token':38 'token balance lookup' 'unit':157 'unknown':223 'usdc':74,159,163 'usdc-settlement' 'util':117 'valid':96 'via':5,18,57 'wallet':3,16,33,189 'wallet balance API' 'wallet-balance-query' 'web3':133 'wide':107 'x':91 'x-payment':90 'x402':6,19,59,97,136 'x402 crypto API' 'x402-payment'","prices":[{"id":"3abcfc9d-914b-441c-bf4a-0eb7a8df50ab","listingId":"2a55b05b-637c-43de-93b9-a633e57b351f","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:22.087Z"}],"sources":[{"listingId":"2a55b05b-637c-43de-93b9-a633e57b351f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:22.087Z","lastSeenAt":"2026-04-23T11:04:02.626Z"}],"details":{"listingId":"2a55b05b-637c-43de-93b9-a633e57b351f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/QNT/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USD Coin (USDC) at asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/QNT/balance"}],"useCases":["Checking QNT token balance for a given wallet address","Monitoring Quant holdings programmatically","Building portfolio dashboards that need QNT balance data","Agent-driven wallet balance verification before executing trades"],"bestFor":["Developers needing quick, keyless QNT balance lookups","AI agents that can settle x402 micropayments on Base","Applications requiring on-demand crypto balance checks without subscription overhead"],"notFor":["Bulk or high-frequency balance polling (no documented rate limits but $0.02/call adds up)","Users who need detailed transaction history or multi-token balance in a single call","Anyone without a Base-compatible USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.433Z"},"updatedAt":"2026-04-23T11:04:02.626Z"}}