{"id":"32601086-6601-4f16-ba0c-bea961b2d09e","shortId":"wyJtNk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/327` returns a valid x402 challenge (HTTP 402) advertising an exact-payment scheme. The max amount required is 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 endpoint accepts POST requests and returns application/json.\n\nWhile the provider's landing page lists a broad catalog of endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), the specific functionality behind `/api/v1/payments/327` is not documented beyond the label \"Premium API Access.\" No OpenAPI spec, detailed request/response schemas, or usage examples were found in the crawl. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. This makes it difficult to determine exactly what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/327 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.","No OpenAPI spec or request/response schema found.","No examples of successful responses available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/327","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/payments/327","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a label, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/payments/327 is 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'/request':13,28 '0.02':12,27,73,126 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':120 '20':114 '2913':121 '300':140 '402':102 '6':130 'Base network API' 'USDC micropayment endpoint' 'accept':145 'access':7,22,38,192 'addit':223 'address':136 'advertis':103 'ai':60 'amount':111 'analysi':166 'analyt':59 'api':6,21,37,85,191,209 'application/json':150 'base':9,24,81,116,123 'behind':182 'beyond':187 'broad':159 'call':4,19 'catalog':160 'categori':56 'challeng':100 'classif':168 'commit':90 'connect':218 'content':224 'convers':176 'crawl':206 'crypto-paid API' 'data':58,233 'decim':131 'detail':196 'determin':230 'difficult':228 'doc':208 'document':186 'embed':169 'endpoint':32,49,69,94,144,162,238 'equal':125 'exact':106,231 'exact-pay':105 'exampl':201 'exchang':172 'feed':171 'financ':63 'found':203 'function':181 'generat':178 'geocod':174 'given':127 'http':101 'includ':57 'infrastructur':66 'json-response' 'key':86 'label':189 'land':155 'learn':62 'limit':88 'list':157 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'make':226 'mani':48 'max':110 'metric':163 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':194 'page':156,213 'particular':237 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,107,132 'per':3,18,74 'post':146 'post-method' 'premium':5,20,36,190 'premium API' 'price':71,170,210 'prompt':220 'protocol':43 'provid':35,53,153 'rate':87,173 'readm':212 'render':215 'report':164 'request':75,147 'request/response':197 'requir':91,112 'return':96,149,239 'schema':198 'scheme':108 'second':141 'sent':134 'sentiment':165 'servic':235 'span':55 'spec':195 'specif':93,180 'summar':167 'timeout':142 'unit':117 'usag':200 'usdc':15,30,78,119,128 'usdc-base' 'util':67 'valid':98,175 'via':10,25,39 'wallet':219 'web3':64 'x402':11,26,41,99 'x402 API' 'x402-payment'","prices":[{"id":"b0f79fb5-3cb3-4468-8036-5b0c76736507","listingId":"32601086-6601-4f16-ba0c-bea961b2d09e","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/payments/327","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:32.585Z"}],"sources":[{"listingId":"32601086-6601-4f16-ba0c-bea961b2d09e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/327","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:32.585Z","lastSeenAt":"2026-04-22T09:01:18.969Z"}],"details":{"listingId":"32601086-6601-4f16-ba0c-bea961b2d09e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/327 \\\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":"All endpoints priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/327"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/327"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API service paid per-call with USDC on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base automatically","Users who want pay-as-you-go access without subscriptions or API keys"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.787Z"},"updatedAt":"2026-04-22T09:01:18.969Z"}}