{"id":"0c6b93b0-2f80-4e7e-a4cd-a1aae33b612b","shortId":"dhZh5Z","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 on the platform share the same pricing model: $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/47` appears to be related to Stripe invoice data, though the platform's landing page does not list it among its publicly advertised APIs. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this specific invoice endpoint returns or what input it expects beyond a POST request with an x402 payment header.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","stripe-invoices"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","stripe invoice endpoint","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","This specific endpoint (/api/v1/stripe/invoices/47) is not listed among the platform's publicly advertised APIs","No request body schema or response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually returns. The specific path (/stripe/invoices/47) is not listed on the platform's public API catalog, adding uncertainty about its 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'/request':18,36 '0.02':17,35,83,157 '000':146 '0913':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':168 '0x8335':151 '20':145 '300':171 '6':161 'Base network API' 'USDC micropayment API' 'accept':136 'access':7,25,44 'addit':194 'address':167 'advertis':127 'ai':64 'among':124 'analyt':63 'api':6,24,43,95,128,180 'appear':106 'base':11,29,91,147,154 'base-network' 'beyond':219 'call':4,22 'categori':72 'challeng':131 'commit':100 'confirm':132 'connect':189 'content':195 'crypto-paid API' 'data':62,113 'decim':162 'descript':206 'doc':179 'document':174 'endpoint':38,55,74,104,212 'equal':156 'exampl':203 'expect':218 'extrem':176 'financ':67 'given':158 'header':227 'infrastructur':70 'input':216 'invoic':112,211 'key':96 'land':118 'learn':66 'limit':98 'list':122 'live':135 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':65 'mani':54 'model':82 'network':12,30,92 'no-api-key' 'offer':56 'one':52 'openapi':199 'page':119,184 'paid':86 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,141,163,226 'per':3,21,84 'platform':59,77,116 'post':137,221 'premium':5,23,42 'price':81,181 'prompt':191 'protocol':49 'provid':41 'public':126 'rate':97 'readm':183 'relat':109 'render':186 'request':85,138,222 'request/response':202 'requir':101,140 'return':213 'schema':200 'second':172 'sent':165 'settl':13,31 'share':78 'span':61 'spars':177 'specif':103,210 'stripe':111 'stripe invoice endpoint' 'stripe-invoices' 'though':114 'timeout':173 'unit':148 'usdc':15,33,88,150,159 'usdc-settlement' 'util':71 'via':8,26,45 'wallet':190 'web3':68 'x402':9,27,47,130,225 'x402 API' 'x402-payment'","prices":[{"id":"6a41fbdb-43fe-40c1-9f6a-49943a6ac2bd","listingId":"0c6b93b0-2f80-4e7e-a4cd-a1aae33b612b","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:05.520Z"}],"sources":[{"listingId":"0c6b93b0-2f80-4e7e-a4cd-a1aae33b612b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:05.520Z","lastSeenAt":"2026-04-25T07:03:30.167Z"}],"details":{"listingId":"0c6b93b0-2f80-4e7e-a4cd-a1aae33b612b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/47 \\\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":"Platform charges $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms endpoint is live, accepts POST, requires up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/47"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/47"}],"useCases":["Accessing Stripe invoice data without traditional API key management","Programmatic pay-per-use access to premium financial data","Agent-driven invoice retrieval with on-chain payment settlement"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.708Z"},"updatedAt":"2026-04-25T07:03:30.167Z"}}