{"id":"c5501c79-a19e-4220-9d1a-2264b967809d","shortId":"NqzcpX","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 specific endpoint `/api/v1/stripe/subscriptions/12` is listed separately from the site's broader catalog of data, AI, finance, and utility APIs. The x402 challenge indicates it accepts payment via the \"exact\" scheme on the Base network, settling in USDC (contract 0x8335…2913) to address 0x1A2B…85F3. The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe parent site lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint's path (`/stripe/subscriptions/12`) suggests it may relate to a Stripe subscription management or proxy function rather than the general-purpose APIs listed on the homepage.\n\nDocumentation is extremely sparse: the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns or expects as input beyond the x402 challenge's indication that it accepts HTTP POST with JSON output. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","http-post","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","stripe subscription API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only a wallet-connect prompt","No OpenAPI or input/output schema beyond the x402 challenge metadata","The endpoint path '/api/v1/stripe/subscriptions/12' suggests Stripe subscription functionality but no details are provided on what data is returned or what input is expected","Cannot verify what the endpoint actually does when payment is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/12","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/12","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 schema, no request/response examples, and the endpoint's actual functionality (what it returns for a successful paid request) is unknown. The path suggests Stripe subscription management but this is 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'/api/v1/stripe/subscriptions/12':44 '/docs':185 '/pricing':187 '/readme':189 '/stripe/subscriptions/12':156 '0.02':102,137 '000':92 '0x1a2b':84 '0x8335':80 '20':91 '2913':81 '402':243 '6':99 '85f3':85 'Base network API' 'USDC API access' 'accept':66,232 'access':6,20,36 'address':83 'ai':56 'ai/ml':122 'amount':88 'analyt':121 'api':5,19,35,60,118,142,175 'base':8,22,74,93 'base-network' 'behind':37 'beyond':224 'broader':52,111 'call':12,26,117 'captur':245 'catalog':53 'challeng':63,227,244 'classif':126 'commit':149 'confirm':241 'connect':195 'content':201 'contract':79 'data':55,120,130 'decim':100 'descript':213 'detail':212 'document':180 'embed':127 'endpoint':30,43,153,218,239 'equal':101 'exact':70 'exampl':209 'expect':221 'extrem':182 'financ':57 'finance/crypto':128 'function':168 'gate':3,17 'general':173 'general-purpos':172 'homepag':179 'host':109 'howev':150 'http':233 'http-post' 'indic':64,229 'infer':123 'infrastructur':132 'input':223 'json':236 'json-response' 'key':143 'limit':146 'list':46,176 'live':242 'lowpaymentfee' 'lowpaymentfee.com':32,108 'manag':165 'market':129 'maximum':87 'may':159 'micropayment API' 'network':75 'openapi':205 'output':237 'page':190 'paid':9,23 'parent':106 'particular':217 'path':155 'pay':115 'pay-per-cal':114 'pay-per-call API' 'payment':67 'paywal':40 'per':11,25,103,116,138 'per-cal':10,24 'per-call-pricing' 'post':234 'premium':4,18,34 'price':135 'prompt':197 'provid':33 'proxi':167 'purpos':174 'rate':145 'rather':169 'relat':160 'request':104,139 'request/response':208 'requir':89 'return':192,219 'schema':206 'scheme':71 'sentiment':124 'separ':47 'settl':76 'site':50,107 'span':119 'spars':183 'specif':42,152 'stripe':163 'stripe subscription API' 'subscript':164 'substant':200 'success':246 'suggest':157 'suit':112 'summar':125 'unit':94 'usdc':14,28,78,96 'usdc-settlement' 'util':59,133 'via':68 'wallet':196 'x402':2,16,39,62,226 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3e00b0e2-47fc-4827-b180-28014b10ac26","listingId":"c5501c79-a19e-4220-9d1a-2264b967809d","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:15.632Z"}],"sources":[{"listingId":"c5501c79-a19e-4220-9d1a-2264b967809d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:15.632Z","lastSeenAt":"2026-04-22T20:01:29.853Z"}],"details":{"listingId":"c5501c79-a19e-4220-9d1a-2264b967809d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/12 \\\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 20,000 base units of USDC on Base network (≈$0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/12"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/12"}],"useCases":["Paying per-call for premium API access without API keys or subscriptions","Programmatic access to a Stripe subscription-related endpoint via crypto micropayments","Agent-driven API consumption settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.194Z"},"updatedAt":"2026-04-22T20:01:29.853Z"}}