{"id":"5b4e9057-672e-4313-a7cd-e417f9258e7e","shortId":"EQNjWf","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 52) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 USD (USDC uses 6 decimals).\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services—all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint listed here (/api/v1/stripe/invoices/52) is not among the publicly documented APIs on the landing page. Its description is simply \"Premium API Access,\" and no further documentation, request schema, or response schema is available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause of the lack of documentation for this specific endpoint, it is unclear what data it returns or what input it expects beyond a POST request. The x402 challenge is live and well-formed, confirming the endpoint is operational, but consumers should be aware that the actual functionality behind this route is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice","pay-per-call","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["This specific endpoint (/api/v1/stripe/invoices/52) is not listed among the site's publicly documented APIs","No request or response schema is available — functionality is unknown","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no content","The endpoint path suggests access to a single specific Stripe invoice (ID 52), which may have limited general utility"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/52","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational at $0.02/call in USDC on Base. However, there is no OpenAPI schema, no documented request/response format, no examples, and the specific endpoint (/api/v1/stripe/invoices/52) is not listed among the site's publicly advertised APIs. Docs pages render only a wallet-connect 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'0.02':87,126 '000':80 '0x8335':65 '20':79 '2913':66 '52':42 '6':91 'Base network API' 'USDC micropayment API' 'accept':49 'access':34,163 'actual':239 'addit':190 'advertis':97 'ai/ml':110 'among':148 'amount':74 'analysi':113 'analyt':109 'api':106,131,152,162,179 'avail':174 'awar':236 'base':8,22,60,81 'base-network' 'behind':43,241 'beyond':214 'broad':99 'call':12,26,77,105 'catalog':100 'challeng':220 'classif':115 'commit':138 'confirm':227 'connect':185 'consum':233 'content':191 'contract':64 'data':108,119,206 'decim':92 'descript':158 'doc':176 'document':151,167,197 'embed':116 'endpoint':6,20,30,48,142,201,229 'equal':86 'exact':70 'expect':213 'finance/crypto':117 'form':226 'function':240 'gate':3,17 'host':94 'howev':139 'id':41 'infer':111 'input':211 'invoic':5,19,38,40 'json':54 'json-response' 'key':132 'lack':195 'land':155 'limit':135 'list':143 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,96 'market':118 'maximum':73 'network':61 'oper':231 'page':156,180 'paid':9,23 'pay':103 'pay-per-cal':102 'pay-per-call' 'pay-per-request API' 'payment':55 'paywal':46 'per':11,25,76,104,127 'per-cal':10,24 'post':50,216 'premium':161 'price':124,177 'prompt':187 'provid':33 'public':150 'rate':134 'render':182 'request':51,128,168,217 'requir':75 'resourc':39 'respons':171 'return':53,208 'rout':243 'schema':169,172 'scheme':71 'sentiment':112 'servic':122 'settl':57 'simpli':160 'site':95 'span':107 'specif':141,200 'stripe':4,18,37 'stripe invoice API' 'stripe-invoice' 'summar':114 'unclear':204 'undocu':245 'unit':82 'usd':88 'usdc':14,28,63,84,89 'usdc-settlement' 'use':62,90 'util':121 'via':67 'wallet':186 'well':225 'well-form':224 'x402':2,16,45,69,219 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"aa5e1da2-e158-4097-bca9-641ab6311cdf","listingId":"5b4e9057-672e-4313-a7cd-e417f9258e7e","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:01.877Z"}],"sources":[{"listingId":"5b4e9057-672e-4313-a7cd-e417f9258e7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:01.877Z","lastSeenAt":"2026-04-25T07:03:30.015Z"}],"details":{"listingId":"5b4e9057-672e-4313-a7cd-e417f9258e7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/52 \\\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 returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/52"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/52"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs for analytics, AI/ML, finance, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data via a crypto-paid API call","Programmatic access to invoice #52 without traditional API keys","Agent-driven payment-gated data retrieval on Base"],"bestFor":["Developers wanting keyless, pay-per-call access to invoice data","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing documented request/response schemas before integrating","Bulk invoice retrieval or batch processing (single invoice endpoint)","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.87Z"},"updatedAt":"2026-04-25T07:03:30.015Z"}}