{"id":"23ee82d2-3b0c-4842-9598-afef3a018294","shortId":"FMPvuN","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, settling payments in USDC on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme, requiring an X-PAYMENT header with each POST request.\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. However, this specific endpoint (/api/v1/stripe/subscriptions/114) is labeled \"Premium API Access\" and its exact functionality is not documented beyond that title.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402). Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint actually returns. The \"stripe/subscriptions\" path segment suggests it may relate to Stripe subscription management, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","post-endpoint"],"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 — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema provided; request and response formats are unknown","The endpoint path '/api/v1/stripe/subscriptions/114' suggests Stripe subscription functionality but this is unconfirmed","Actual service behind 'Premium API Access' is undocumented and unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/114","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the label 'Premium API Access'. The docs pages are empty. Functionality must be guessed from the URL 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'0.02':67,136 '000':58 '20':57 '402':180 '6':63 'Base network API' 'USDC API access' 'access':6,20,36,148,158 'actual':225 'advertis':92 'ai':105 'analysi':109 'analyt':99 'api':5,19,35,96,141,157,190 'base':8,22,47,59 'base-network' 'behind':37 'beyond':166 'broader':89 'call':12,26 'challeng':51,178 'classif':112 'connect':199 'content':205 'convers':129 'cost':55 'crypto-paid API' 'data':98,102,219 'decim':64 'descript':216 'doc':189 'document':165,181 'embed':113 'endpoint':30,132,152,170,224 'equal':66 'estim':123 'exact':76,161 'exampl':213 'exchang':118 'export':103 'extrem':186 'feed':117 'financ':114 'function':162 'gas':122 'gate':3,17 'generat':130 'geocod':127 'header':83 'howev':149 'http':179 'indic':52 'infrastructur':125 'insight':104 'instant':147 'key':142 'label':155 'learn':107 'limit':145 'list':134 'live':172 'lowpaymentfee' 'lowpaymentfee.com':32,90 'machin':106 'made':72 'manag':238 'maximum':54 'may':233 'metric':100 'micropayment API' 'network':48 'openapi':209 'page':194 'paid':9,23 'particular':223 'path':229 'pay-per-call API' 'payment':42,70,82 'paywal':40 'per':11,25,68,137 'per-cal':10,24 'per-request-billing' 'platform':91 'post':86 'post-endpoint' 'premium':4,18,34,156 'price':116,191 'prompt':201 'provid':33 'quot':121 'rate':119,144 'readm':193 'relat':234 'render':196 'report':101 'request':69,87,138 'request/response':212 'requir':78 'return':174,226 'schema':210 'scheme':77 'segment':230 'sentiment':108 'servic':221 'settl':41 'site':184 'span':97 'spars':187 'specif':151 'specul':242 'stripe':236 'stripe/subscriptions':228 'subscript':237 'suggest':231 'suit':94 'summar':111 'text':110 'titl':168 'token':120 'unit':60 'usdc':14,28,44,62 'usdc-settlement' 'util':126 'valid':128,176 'via':73 'wallet':200 'web3':115 'x':81 'x-payment':80 'x402':2,16,39,50,75,177 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1f51f732-b718-416f-b633-a1de6a1751af","listingId":"23ee82d2-3b0c-4842-9598-afef3a018294","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:18.007Z"}],"sources":[{"listingId":"23ee82d2-3b0c-4842-9598-afef3a018294","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:18.007Z","lastSeenAt":"2026-04-22T18:04:20.621Z"}],"details":{"listingId":"23ee82d2-3b0c-4842-9598-afef3a018294","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/114 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/114"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/114"}],"useCases":["Programmatic access to a premium API service with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","Production workloads that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.082Z"},"updatedAt":"2026-04-22T18:04:20.621Z"}}