{"id":"30fce367-0355-49bd-911d-d63e5515680c","shortId":"LDE7LA","kind":"x402","title":"Pay-per-call premium API access via x402 on Base network, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API access via x402 on Base network, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints share a uniform pricing model of $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/stripe/invoices/73` appears to be part of a Stripe invoices integration, though the crawled documentation provides no further detail on its input/output schema beyond confirming it accepts HTTP POST and returns application/json. The x402 challenge is live and well-formed: it requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.\n\nThe platform advertises simplicity: no API keys, no rate limits, instant access, and pay-only-for-what-you-use pricing. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so detailed request/response schemas and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","stripe-invoices","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","lowpaymentfee","stripe invoice API","Base network API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) return no useful content beyond 'Connect wallet'","No OpenAPI or schema available for request/response format","The endpoint path '/api/v1/stripe/invoices/73' suggests a specific resource (invoice #73) rather than a general-purpose API — unclear if this is a demo or production resource","No information on what data is returned or what POST body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/73","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/invoices/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages are empty, there is no OpenAPI schema, no request/response examples, and the specific purpose of this 'stripe/invoices/73' endpoint is unclear beyond its 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'/request':18,36 '0.02':17,35,81,161 '000':150 '0x8335':155 '20':149 '2913':156 '6':165 'Base network API' 'USDC micropayment endpoint' 'accept':128 'access':7,25,44,178 'advertis':169 'ai':64 'analyt':63 'api':6,24,43,93,172 'appear':104 'application/json':133 'base':11,29,89,151,158 'base-network' 'beyond':125,190 'call':4,22 'categori':72 'challeng':136 'commit':98 'confirm':126 'connect':199 'crawl':115 'crypto-paid API' 'data':62 'decim':166 'detail':120,202 'document':116,188 'empti':196 'endpoint':38,55,74,102 'equal':160 'exact':146 'exampl':207 'financ':67 'form':142 'given':162 'http':129 'infrastructur':70 'input/output':123 'instant':177 'integr':112 'invoic':111 'json-response' 'key':94,173 'land':192 'larg':195 'learn':66 'limit':96,176 'live':138 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':65 'mani':54 'model':79 'network':12,30,90 'no-api-key' 'offer':56 'one':52 'page':189,193 'paid':84 'part':107 'pay':2,20,181 'pay-only-for-what-you-us':180 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,147 'per':3,21,82 'platform':59,168 'post':130 'premium':5,23,42 'price':78,187 'protocol':49 'provid':41,117 'rate':95,175 'request':83 'request/response':203 'requir':99,144 'return':132 'schema':124,204 'settl':13,31 'share':75 'show':197 'simplic':170 'span':61 'specif':101 'stripe':110 'stripe invoice API' 'stripe-invoices' 'though':113 'unavail':209 'uniform':77 'unit':152 'usag':206 'usdc':15,33,86,154,163 'usdc-settlement' 'use':186 'util':71 'via':8,26,45 'wallet':200 'web3':68 'well':141 'well-form':140 'x402':9,27,47,135 'x402 API' 'x402-payment'","prices":[{"id":"4a8afd70-781b-4290-8818-8c7cf77b6c85","listingId":"30fce367-0355-49bd-911d-d63e5515680c","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/invoices/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:00.704Z"}],"sources":[{"listingId":"30fce367-0355-49bd-911d-d63e5515680c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:00.704Z","lastSeenAt":"2026-04-25T08:33:11.731Z"}],"details":{"listingId":"30fce367-0355-49bd-911d-d63e5515680c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/73 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requires 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/73"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatically accessing Stripe invoice data without traditional API key management","Agent-driven payment flows where per-call billing is preferred over subscriptions","Integrating invoice retrieval into automated financial workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing Stripe invoice data without managing OAuth or API keys"],"notFor":["High-volume use cases where per-request pricing becomes expensive at scale","Users who need detailed documentation or SDKs before integrating","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.931Z"},"updatedAt":"2026-04-25T08:33:11.731Z"}}