{"id":"e8534c0a-bc40-4926-9885-72b43fcd4b85","shortId":"GwtaAn","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The price per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request. Payment is made via the x402 \"exact\" scheme to a specified wallet address, with a 300-second timeout window.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via Base network USDC payments.\n\nHowever, the specific endpoint being listed here — `/api/v1/stripe/subscriptions/44` — is labeled \"Premium API Access\" without further documentation on what data or functionality it returns. The crawled docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-billing","premium-api-access","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","micropayment API"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The endpoint path '/api/v1/stripe/subscriptions/44' suggests Stripe subscription management but this is unconfirmed","Unknown what data or functionality is returned after successful payment","Platform appears to be early-stage with many advertised endpoints but no verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/44","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/subscriptions/44","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 documentation, no OpenAPI schema, no request/response examples, and no explanation of what \"Premium API Access\" actually returns. The docs/pricing/API pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'0.02':74,145 '000':65 '20':64 '300':93 '6':70 'Base network API' 'USDC API access' 'access':6,20,36,157,175 'addit':203 'address':90 'advertis':101 'ai':114 'analysi':118 'analyt':108 'api':5,19,35,105,150,174,190 'avail':217 'base':8,22,57,66,159 'behind':37 'broader':98 'call':12,26,62 'challeng':50 'classif':121 'connect':198 'content':204 'convers':138 'crawl':187 'crypto-paid API' 'data':107,111,181 'decim':71 'detail':215 'doc':188 'document':178,216 'embed':122 'endpoint':30,42,141,166,223 'equal':73 'estim':132 'exact':84 'exampl':212 'exchang':127 'export':112 'feed':126 'financ':123 'function':183 'gas':131 'gate':3,17 'generat':139 'geocod':136 'howev':163 'http-post' 'infrastructur':134 'insight':113 'instant':156 'key':151 'label':172 'learn':116 'limit':154 'list':143,168 'live':44 'lowpaymentfee' 'lowpaymentfee.com':32,99 'machin':115 'made':80 'metric':109 'micropayment API' 'network':58,160 'no-api-key' 'openapi':208 'page':193 'paid':9,23 'pay-per-call API' 'payment':52,78,162 'paywal':40 'per':11,25,61,76,146 'per-cal':10,24 'per-call-billing' 'platform':100,226 'premium':4,18,34,173 'premium-api-access' 'price':60,125,189 'prompt':200 'provid':33 'quot':130 'rate':128,153 'readm':192 'render':195 'report':110 'request':77,147 'request/response':211 'requir':51 'return':46,185 'schema':209 'scheme':85 'second':94 'sentiment':117 'span':106 'specif':165 'specifi':88 'standard':48 'suit':103 'summar':120 'text':119 'timeout':95 'token':129 'unit':67 'usd':75 'usdc':14,28,54,69,161 'usdc-base' 'util':135 'valid':137 'via':81,158 'wallet':89,199 'web3':124 'window':96 'without':176 'x402':2,16,39,49,83 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6fa6ed9a-811c-4363-a935-bae2c62734a0","listingId":"e8534c0a-bc40-4926-9885-72b43fcd4b85","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/subscriptions/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:48.238Z"}],"sources":[{"listingId":"e8534c0a-bc40-4926-9885-72b43fcd4b85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:48.238Z","lastSeenAt":"2026-04-22T12:01:42.954Z"}],"details":{"listingId":"e8534c0a-bc40-4926-9885-72b43fcd4b85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/44 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/44","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/44"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint without traditional API key registration","Agent-driven workflows that need to pay per-call using USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible agents that can settle USDC payments on Base","Exploring low-cost micropayment API patterns"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","Use cases requiring free or trial access before committing payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.683Z"},"updatedAt":"2026-04-22T12:01:42.954Z"}}