{"id":"72b671b8-4653-4fb7-bf18-e96e85cf0bed","shortId":"xXP9jp","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/208` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe x402 challenge confirms the endpoint is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The exact functionality behind the `/api/v1/transactions/208` path is unclear — the name \"Premium API Access\" is generic and the crawl provides no details about what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The endpoint path '/api/v1/transactions/208' and title 'Premium API Access' are generic — actual functionality is unknown","No request body schema or response schema documented anywhere","Cannot verify what data or service is returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/208","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/transactions/208","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schemas, no examples, and the endpoint name 'Premium API Access' is completely generic. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. It is impossible to determine what this specific endpoint actually 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'/api/v1/transactions/208':86,211 '/docs':176 '/pricing':177 '/readme':180 '/request':13,28 '0.02':12,27,61,126,168 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':120 '20':114 '2913':121 '300':140 '402 payment API' '6':130 'Base network API' 'USDC micropayment API' 'accept':106 'access':92,219 'addit':146 'address':136 'advertis':145 'ai/ml':49 'analysi':150 'analyt':48 'api':5,20,37,73,91,218 'application/json':95 'avail':205 'base':8,23,69,116,123 'behind':209 'broad':42 'call':4,19 'catalog':43 'challeng':100 'classif':153 'commit':81 'confirm':101 'connect':186 'content':192 'convers':161 'crawl':224 'crypto-paid API' 'data':47,52,230 'decim':131 'detail':227 'document':171,201 'embed':154 'enabl':36 'endpoint':45,57,84,103,147 'equal':125 'everi':56 'exact':108,207 'exact-schem':107 'exampl':204 'exchang':157 'extrem':173 'feed':156 'finance/web3':51 'function':208 'generic':221 'geocod':159 'given':127 'infer':50 'json-response' 'key':74 'limit':77 'list':88 'live':105 'lowpaymentfee' 'lowpaymentfee.com':31 'name':216 'network':9,24,70 'no-api-key' 'offer':40 'openapi':196 'page':181 'paid':64 'path':212 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':110,132 'per':3,18,62 'platform':6,21,38,144 'point':170 'post':97 'post-method' 'premium':90,217 'price':59,155,169 'prompt':188 'provid':225 'rate':76,158 'render':183 'request':63 'request/response':199 'return':94,234 'schema':200 'scheme':109 'second':141 'sent':134 'sentiment':149 'servic':55,232 'span':46 'spec':197 'specif':83 'summar':152 'text':151 'thin':174 'timeout':142 'unclear':214 'unit':117 'upfront':80 'usdc':15,30,66,119,128 'usdc-base-network' 'util':54 'valid':160 'via':10,25,96 'wallet':187 'x402':11,26,35,99 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e2392986-7205-47a6-8275-c33ad9f3b031","listingId":"72b671b8-4653-4fb7-bf18-e96e85cf0bed","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/transactions/208","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:15.057Z"}],"sources":[{"listingId":"72b671b8-4653-4fb7-bf18-e96e85cf0bed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/208","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:15.057Z","lastSeenAt":"2026-04-22T13:31:47.410Z"}],"details":{"listingId":"72b671b8-4653-4fb7-bf18-e96e85cf0bed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/208 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 on Base network with USDC","source_url":"https://lowpaymentfee.com/api/v1/transactions/208"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, maxAmountRequired 20000 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/208"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, per-request billing"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying per-request in USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.842Z"},"updatedAt":"2026-04-22T13:31:47.410Z"}}