{"id":"753d39ec-ff43-40d8-954d-9c6e57780fcf","shortId":"6sAPPu","kind":"x402","title":"Premium API access via x402 payment on Base, settling in USDC per request.","tagline":"Premium API access via x402 payment on Base, settling in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most endpoints are listed at $0.02 per request.\n\nThis specific endpoint (`/api/v1/stripe/subscriptions/6`) is labeled \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC on Base (0x8335…2913), which equals $0.02 USD (USDC uses 6 decimals). Payment is via the x402 exact scheme — a single per-call micropayment settled on the Base L2 network. No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with the appropriate x402 payment proof.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 description of what this particular subscription endpoint returns or expects as input beyond a POST method. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or service is actually delivered upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API subscription","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior upon successful payment is unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","The endpoint path includes 'stripe/subscriptions' which is unusual for an x402-settled endpoint; purpose is unclear","No example requests or responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/6","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/6","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 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what the endpoint actually returns. The listing is effectively a stub with confirmed 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'0.02':82,112 '000':101 '0x8335':108 '20':100 '2913':109 '402':216 '6':116 'Base network API' 'USDC micropayment endpoint' 'access':3,16,34,93 'actual':229 'ai/ml':54 'analysi':56 'analyt':53 'api':2,15,33,50,92,138,168 'appropri':157 'attach':149 'base':8,21,102,107,134 'behind':35 'beyond':205 'broad':43 'call':129 'caller':147 'carri':95 'catalog':44 'challeng':217 'charg':98 'classif':58 'commit':144 'connect':176 'content':182 'convers':75 'crypto-paid API' 'data':52,225 'decim':117 'deliv':230 'descript':193 'doc':166 'document':161,220 'embed':59 'endpoint':28,78,87,199,210 'equal':111 'estim':69 'exact':123 'exchang':64 'expect':202 'extrem':163 'feed':63 'financ':60 'gas':68 'generat':76 'geocod':73 'header':154 'host':41 'infrastructur':71 'input':204 'key':139 'l2':135 'label':90 'limit':141 'list':80 'live':212 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':97 'method':208 'micropay':130 'micropayment' 'network':136 'no-api-key' 'openapi':186 'page':171 'particular':197 'pay':47 'pay-per-call API' 'pay-per-request':46 'payment':6,19,118,153,159,233 'paywal':38 'per':12,25,48,83,128 'per-cal':127 'post':207 'post-method' 'premium':1,14,32,91 'premium API subscription' 'price':62,167 'prompt':178 'proof':160 'provid':31 'quot':67 'rate':65,140 'readm':170 'render':173 'request':13,26,49,84 'request/response':189 'requir':146 'return':200,213 'schema':190 'scheme':124 'sentiment':55 'servic':227 'settl':9,22,131 'simpli':148 'singl':126 'site':40 'span':51 'spars':164 'spec':187 'specif':86 'subscript':198 'success':232 'summar':57 'token':66 'unclear':223 'unit':103 'upfront':143 'upon':231 'usd':113 'usdc':11,24,105,114 'usdc-base' 'use':115 'util':72 'valid':74,215 'via':4,17,120 'wallet':177 'web3':61 'without':219 'x':152 'x-payment':151 'x402':5,18,37,122,158 'x402 API' 'x402-payment'","prices":[{"id":"a22be5be-16d5-4810-9fe6-2c59bd3d74d1","listingId":"753d39ec-ff43-40d8-954d-9c6e57780fcf","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:51.801Z"}],"sources":[{"listingId":"753d39ec-ff43-40d8-954d-9c6e57780fcf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:51.801Z","lastSeenAt":"2026-04-22T10:02:16.836Z"}],"details":{"listingId":"753d39ec-ff43-40d8-954d-9c6e57780fcf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/6"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/6"},{"claim":"Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with predictable flat-rate pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.48Z"},"updatedAt":"2026-04-22T10:02:16.836Z"}}