{"id":"8cb0045a-3ae8-4d60-8d6c-31012f8b739e","shortId":"pKJ629","kind":"x402","title":"Pay-per-call premium API access via x402 on Base network, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API access via x402 on Base network, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/invoices/36` accepts POST requests and is gated by an x402 payment challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds. No API key or account registration is needed — access is granted immediately upon valid payment.\n\nThe platform advertises a broad suite of endpoints including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation beyond the landing page is essentially empty (pages return only \"Connect wallet\"), so the actual capabilities and response formats of this specific invoice endpoint are unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","stripe invoice API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No OpenAPI or schema available for request/response formats","The specific function of the '/api/v1/stripe/invoices/36' endpoint is unclear — 'Premium API Access' is generic","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/36","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/stripe/invoices/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation on request/response schemas, no OpenAPI spec, and all doc pages are empty. The specific purpose of '/api/v1/stripe/invoices/36' is unexplained beyond the generic 'Premium API Access' 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'/request':18,36 '0.02':17,35,76,126 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':121 '300':136 '6':130 'Base network API' 'USDC micropayment endpoint' 'accept':94 'access':7,25,44,146 'account':142 'actual':202 'advertis':155 'ai':64 'amount':119 'analysi':168 'analyt':63 'api':6,24,43,81,139 'base':11,29,110,123 'base-network' 'beyond':188 'broad':157 'call':4,22 'capabl':203 'challeng':104 'classif':171 'commit':88 'connect':198 'contract':114 'convers':183 'data':62,164 'decim':131 'document':187 'embed':172 'empti':194 'endpoint':38,55,92,160,211 'essenti':193 'estim':180 'exchang':175 'export':165 'feed':174 'financ':67 'format':206 'gas':179 'gate':99 'generat':185 'geocod':181 'given':127 'grant':148 'howev':186 'i.e':125 'immedi':149 'includ':161 'infrastructur':70 'insight':166 'invoic':210 'key':82,140 'land':190 'learn':66 'limit':85 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':65 'mani':54 'maximum':118 'metric':162 'need':145 'network':12,30,111 'no-api-key' 'offer':56 'one':52 'page':191,195 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,103,105,133,152 'per':3,21,77 'platform':59,154 'post':95 'post-method' 'premium':5,23,42 'price':74,173 'protocol':49 'provid':41 'quot':178 'rate':84,176 'registr':143 'report':163 'request':78,96 'requir':89 'respons':205 'return':196 'second':137 'sentiment':167 'servic':72 'settl':13,31,107 'span':61 'specif':91,209 'stripe invoice API' 'suit':158 'summar':170 'text':169 'timeout':134 'token':177 'unclear':213 'unit':124 'upon':150 'usdc':15,33,113,128 'usdc-settlement' 'use':112 'util':71 'valid':151,182 'via':8,26,45 'wallet':199 'web3':68 'x402':9,27,47,102 'x402 API' 'x402-payment'","prices":[{"id":"4e62992a-45e3-4a16-bf92-b992143b52d3","listingId":"8cb0045a-3ae8-4d60-8d6c-31012f8b739e","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/stripe/invoices/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:58.295Z"}],"sources":[{"listingId":"8cb0045a-3ae8-4d60-8d6c-31012f8b739e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:58.295Z","lastSeenAt":"2026-04-25T08:33:11.650Z"}],"details":{"listingId":"8cb0045a-3ae8-4d60-8d6c-31012f8b739e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/36 \\\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":"Platform offers APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/36"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/36"}],"useCases":["Programmatic access to premium data or services without account registration","Agent-driven API consumption with per-call crypto payments","Accessing invoice or billing data via automated workflows"],"bestFor":["Developers wanting zero-signup API access","AI agents that can settle x402 payments on Base","Users who prefer pay-as-you-go without subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or rate guarantees","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.005Z"},"updatedAt":"2026-04-25T08:33:11.650Z"}}