{"id":"f85cf0cf-4c7c-47a2-b2cf-0619249a6f10","shortId":"YRrkrn","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request 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 maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page advertises a broad 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 the Base network. However, the specific endpoint `/api/v1/stripe/subscriptions/77` is labeled \"Premium API Access\" and its exact functionality is not documented beyond that title — it may relate to a Stripe subscription management or provisioning flow.\n\nDocumentation 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 spec, no request/response schema, and no usage examples available. The x402 challenge confirms the endpoint accepts POST requests and returns application/json, but the actual input parameters and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-api","post-method"],"categories":["api-access","payments"],"synonyms":["premium API","x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe subscription API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found; request parameters and response format are unknown","The endpoint path '/api/v1/stripe/subscriptions/77' suggests Stripe subscription management but this is unconfirmed","The broad suite of APIs advertised on the landing page may be placeholder or demo content — no way to verify actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/77","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual functionality (\"Premium API Access\" at a Stripe subscriptions path) is unclear. Effectively a stub 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'/api/v1/stripe/subscriptions/77':150 '/docs':182 '/pricing':184 '/readme':186 '0.02':76,129 '000':67 '20':66 '6':72 'Base network API' 'USDC API access' 'accept':218 'access':6,20,36,141,155 'actual':226 'advertis':84 'ai':98 'amount':61 'analysi':102 'analyt':92 'api':5,19,35,89,134,154 'application/json':223 'avail':211 'base':8,22,57,68,144 'behind':37 'beyond':163 'broad':86 'call':64 'challeng':50,214 'classif':105 'confirm':215 'connect':192 'content':198 'convers':122 'data':91,95 'decim':73 'document':162,177 'embed':106 'endpoint':30,42,125,149,217 'equal':75 'estim':116 'exact':158 'exampl':210 'exchang':111 'export':96 'extrem':179 'feed':110 'financ':107 'flow':176 'function':159 'gas':115 'gate':3,17 'generat':123 'geocod':120 'howev':146 'infrastructur':118 'input':227 'insight':97 'instant':140 'json-api' 'key':135 'label':152 'land':82 'learn':100 'limit':138 'list':127 'live':44 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':99 'manag':173 'maximum':60 'may':167 'metric':93 'network':58,145 'openapi':202 'page':83,187 'paid':9,23 'paramet':228 'pay-per-request API' 'payment':52 'paywal':40 'per':11,25,63,77,130 'per-request':10,24 'per-request-billing' 'post':219 'post-method' 'premium':4,18,34,153 'premium API' 'price':109 'prompt':194 'provid':33,80 'provis':175 'quot':114 'rate':112,137 'relat':168 'render':189 'report':94 'request':12,26,78,131,220 'request/response':205 'requir':51,62 'respons':230 'return':46,222 'schema':206 'sentiment':101 'span':90 'spars':180 'spec':203 'specif':148 'standard':48 'stripe':171 'stripe subscription API' 'structur':231 'subscript':172 'suit':87 'summar':104 'text':103 'titl':165 'token':113 'unit':69 'unknown':233 'usag':209 'usdc':14,28,54,71 'usdc-base' 'util':119 'valid':121 'via':142 'wallet':193 'web3':108 'x402':2,16,39,49,213 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d5af106e-a79b-4374-96f5-f80b1f0587a7","listingId":"f85cf0cf-4c7c-47a2-b2cf-0619249a6f10","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:03.935Z"}],"sources":[{"listingId":"f85cf0cf-4c7c-47a2-b2cf-0619249a6f10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:03.935Z","lastSeenAt":"2026-04-22T09:01:35.682Z"}],"details":{"listingId":"f85cf0cf-4c7c-47a2-b2cf-0619249a6f10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/77 \\\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 x402 challenge requires a maximum of 20,000 base units of USDC (asset 0x8335…) on Base network, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/77"},{"claim":"The landing page advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven API consumption without API keys or account signup","Accessing subscription-related functionality via x402 payment protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access on Base","Testing x402 payment flows with low-cost endpoints","Crypto-native applications that prefer on-chain settlement"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring guaranteed SLAs or support contracts","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.964Z"},"updatedAt":"2026-04-22T09:01:35.682Z"}}