{"id":"08febe5e-65f4-4222-ae5a-44973c7d2a4e","shortId":"MwGQY8","kind":"x402","title":"Real-time QNT token price data via x402 micropayment on Base for $0.02/request.","tagline":"Real-time QNT token price data via x402 micropayment on Base for $0.02/request.","description":"This endpoint returns the current price of the QNT (Quant) token. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, covering data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/tokens/QNT/price` accepts POST requests and returns JSON. Payment is handled via the X-PAYMENT header using the x402 \"exact\" scheme — no API keys, accounts, or rate limits are required. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second payment timeout.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint appears to be one of many token price endpoints following a `/api/v1/tokens/{symbol}/price` pattern, though only QNT is confirmed in this probe.","tags":[],"capabilities":["token-price-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key","real-time-pricing"],"categories":["finance","crypto"],"synonyms":["QNT price API","Quant token price","crypto price feed","token price endpoint","x402 crypto API","micropayment price data","Base USDC API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","No example responses or error codes documented","The broader site lists many endpoints but none have detailed documentation; quality of data sources is unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/QNT/price","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/price","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 confirms pricing and payment details, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages are empty beyond a wallet-connect prompt. The endpoint's actual behavior and response format must be entirely 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'/api/v1/tokens':212 '/api/v1/tokens/qnt/price':89 '/docs':165 '/price':214 '/pricing':167 '/readme':169 '/request':15,30 '0.02':14,29,83,137 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '20':131 '300':152 '6':142 'Base USDC API' 'QNT price API' 'Quant token price' 'accept':90 'account':113 'address':148 'ai/ml':61 'analyt':60 'api':54,111 'appear':201 'base':12,27,80,133 'base-network' 'beyond':157 'broader':47 'call':53,145 'challeng':121 'confirm':122,220 'connect':175 'cover':58 'crypto price feed' 'current':35 'data':7,22,59,64 'decim':143 'descript':194 'detail':182 'document':156 'endpoint':32,69,88,124,200,209 'exact':108 'exampl':189 'extrem':162 'finance/web3':63 'follow':210 'handl':98 'header':104 'host':55 'infer':62 'json':95 'key':112 'land':159 'limit':116 'live':126 'lowpaymentfee.com':57 'mani':206 'maximum':129 'micropay':10,25 'micropayment price data' 'network':81 'no-api-key' 'one':204 'openapi':186 'page':160,170 'paid':146 'part':44 'pattern':215 'pay':51 'pay-per-cal':50 'pay-per-request' 'payload':191 'payment':73,96,103,154 'per':52,84,144 'post':91 'price':6,21,36,208 'probe':223 'prompt':177 'protocol':74 'qnt':4,19,39,218 'quant':40 'rate':115 'real':2,17 'real-tim':1,16 'real-time-pricing' 'render':172 'request':85,92,127 'request/response':190 'requir':118 'respons':197 'return':33,94 'schema':198 'scheme':109 'second':153 'servic':67 'settl':75 'sinc':139 'spars':163 'spec':187 'specif':87 'suit':48 'symbol':213 'technic':181 'though':216 'time':3,18 'timeout':155 'token':5,20,41,207 'token price endpoint' 'token-price-lookup' 'unit':134 'usd':138 'usdc':77,136,140 'usdc-settlement' 'use':70,105,141 'util':66 'via':8,23,99 'wallet':176 'x':102 'x-payment':101 'x402':9,24,72,107,120 'x402 crypto API' 'x402-micropayment'","prices":[{"id":"e205d8b0-7859-4225-8096-68a93e481f6e","listingId":"08febe5e-65f4-4222-ae5a-44973c7d2a4e","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/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:11.661Z"}],"sources":[{"listingId":"08febe5e-65f4-4222-ae5a-44973c7d2a4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/QNT/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:11.661Z","lastSeenAt":"2026-04-23T21:32:34.476Z"}],"details":{"listingId":"08febe5e-65f4-4222-ae5a-44973c7d2a4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/QNT/price \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/QNT/price"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/QNT/price"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists Finance & Web3 category endpoints including price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current market price of QNT (Quant) token programmatically","Building trading bots or dashboards that need on-demand token pricing without API key management","Agent-driven workflows that need pay-per-call crypto price data with no subscription"],"bestFor":["Agents or apps needing occasional, on-demand QNT price lookups","Developers who want zero-signup, pay-as-you-go crypto price data","x402-compatible clients settling micropayments in USDC on Base"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need historical price data or OHLCV candles (only current price implied)","Anyone without an x402-compatible payment client or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.492Z"},"updatedAt":"2026-04-23T21:32:34.476Z"}}