{"id":"b3c274e1-29be-4767-aa2c-5a62dd62a9c2","shortId":"nttdVB","kind":"x402","title":"Crypto token data for QNT via x402 micropayment on Base, $0.02 per request.","tagline":"Crypto token data for QNT via x402 micropayment on Base, $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides token data for QNT (Quant) through the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled in USDC on the Base network. No API keys or rate limits are required — callers simply attach an x402 payment header to each POST request.\n\nThe specific endpoint `/api/v1/tokens/QNT` sits under the Finance & Web3 category of the platform. While the crawled landing page lists related endpoints like `/api/v1/crypto/quotes` and `/api/v1/finance/prices`, the `/api/v1/tokens/QNT` path suggests it returns token-specific data for the QNT asset. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913 on Base), and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nDocumentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response schema, and no description of the response payload. Consequently, the exact fields returned by this endpoint are unknown and must be discovered by making a paid call.","tags":[],"capabilities":["token-data","crypto-quotes","x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key"],"categories":["finance","crypto"],"synonyms":["QNT token data","Quant token price","crypto token API","token quote API","QNT price feed","x402 crypto API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — response format is entirely undocumented","All doc/pricing/README pages return only a 'Connect wallet' prompt with no technical content","The exact fields and structure of the QNT token response must be inferred or discovered by paying for a call","The platform lists many diverse API categories (AI, analytics, geocoding, etc.) all at the same price, which may indicate placeholder or thin implementations"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/QNT","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/tokens/QNT","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages return only a wallet-connect stub. The actual data returned is 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'/api/v1/crypto/quotes':113 '/api/v1/finance/prices':115 '/api/v1/tokens/qnt':94,117 '/docs':170 '/pricing':171 '/readme':174 '0.02':11,24,61,155 '000':151 '0x8335':141 '20':150 '2913':142 '6':159 'QNT price feed' 'QNT token data' 'Quant token price' 'accept':138 'addit':185 'ai/ml':52 'analyt':51 'api':57,73 'asset':129 'attach':82 'base':10,23,70,144,152 'base-network' 'beyond':162 'broader':47 'call':222 'caller':80 'categori':100 'challeng':132 'charg':146 'confirm':133 'connect':180 'consequ':204 'contract':140 'crawl':106 'crypto':1,14 'crypto token API' 'crypto-quotes' 'data':3,16,33,50,125 'decim':160 'descript':199 'detail':187 'discov':217 'document':161 'endpoint':28,93,111,135,211 'exact':206 'exampl':194 'extrem':167 'field':207 'financ':98 'finance/web3':54 'given':156 'header':86 'i.e':154 'infer':53 'infrastructur':56 'key':74 'land':107,164 'like':112 'limit':77 'list':109 'live':137 'lowpaymentfee.com':30 'make':219 'maximum':148 'micropay':8,21 'micropayment API' 'must':215 'network':71 'no-api-key' 'offer':49 'openapi':191 'page':108,165,175 'paid':221 'part':44 'path':118 'payload':203 'payment':40,85 'per':12,25,62 'per-request-pricing' 'platform':48,103 'post':89 'price':59 'prompt':182 'protocol':41 'provid':31 'qnt':5,18,35,128 'quant':36 'rate':76 'relat':110 'request':13,26,63,90 'request/response':195 'requir':79 'respons':202 'return':121,177,208 'schema':196 'settl':65 'simpli':81 'sit':95 'spec':192 'specif':92,124 'suggest':119 'technic':186 'thin':168 'token':2,15,32,123 'token quote API' 'token-data' 'token-specif':122 'unit':153 'unknown':213 'usdc':67,139,157 'usdc-settlement' 'via':6,19 'wallet':181 'web3':99 'x402':7,20,39,84,131 'x402 crypto API' 'x402-payment'","prices":[{"id":"161f908b-a736-4c21-b014-48ac094d019b","listingId":"b3c274e1-29be-4767-aa2c-5a62dd62a9c2","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/tokens/QNT","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:15.255Z"}],"sources":[{"listingId":"b3c274e1-29be-4767-aa2c-5a62dd62a9c2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/QNT","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:15.255Z","lastSeenAt":"2026-04-23T21:32:34.593Z"}],"details":{"listingId":"b3c274e1-29be-4767-aa2c-5a62dd62a9c2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/QNT \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/tokens/QNT"},{"claim":"Price is $0.02 per request (20000 base units of USDC with 6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/tokens/QNT"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/QNT"},{"claim":"Platform advertises no API keys, no rate limits, $0.02/request pricing across all endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current QNT (Quant) token data for portfolio tracking or trading bots","Integrating real-time token information into Web3 dashboards without managing API keys","Agent-driven crypto research where per-call micropayments replace subscription plans"],"bestFor":["Developers who want keyless, pay-per-call access to token data","AI agents that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where a $0.02/request model beats a monthly subscription"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk pricing","Users who need comprehensive historical OHLCV data (no evidence this endpoint provides it)","Non-crypto callers unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.369Z"},"updatedAt":"2026-04-23T21:32:34.593Z"}}