{"id":"1b94fcef-4492-459d-9f85-a5ba7975afdf","shortId":"JZEYq7","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 \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/stripe/invoices/5` appears to be a Stripe invoice-related API endpoint gated behind an x402 paywall. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services. All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no commitments required. However, the specific endpoint being listed here (`/api/v1/stripe/invoices/5`) is not among the publicly documented API categories on the landing page, and its exact functionality is unclear — the name suggests it may relate to Stripe invoice retrieval or creation.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render 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 accepts. The x402 challenge confirms the endpoint is live and accepting POST requests, but the actual behavior behind the paywall is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-request endpoint","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available","The /docs, /api, /pricing, and /README pages contain no useful content — only a wallet connect prompt","The specific endpoint /api/v1/stripe/invoices/5 is not listed among the publicly advertised APIs on the landing page","Exact request body format and response structure are unknown","The hardcoded '/5' in the path suggests this may be a single fixed resource rather than a parameterized endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/5","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific endpoint's purpose (Stripe invoices) is only inferable from the URL path. Docs pages are 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'/api/v1/stripe/invoices/5':45,143 '/docs':179 '/pricing':181 '/readme':183 '/request':123 '0.02':78,122 '000':82 '0x8335':71 '20':81 '2913':72 '6':86 'Base network API' 'USDC micropayment API' 'accept':215,225 'access':36 'actual':230 'advertis':92 'ai/ml':104 'among':146 'analysi':107 'analyt':103 'api':35,54,100,127,150 'appear':46 'base':8,22,66,83 'base-network' 'behavior':231 'behind':57,232 'broader':89 'call':12,26,99 'categori':151 'challeng':218 'classif':109 'commit':134 'confirm':219 'connect':189 'content':195 'contract':70 'cost':76 'creation':173 'data':102,112 'decim':87 'descript':207 'detail':206 'document':149,174 'embed':110 'endpoint':6,20,30,55,118,139,212,221 'exact':158 'exampl':203 'extrem':176 'feed':113 'finance/crypto':111 'function':159 'gate':3,17,56 'howev':136 'infer':105 'invoic':5,19,52,170 'invoice-rel':51 'key':128 'land':154 'limit':131 'list':141 'live':223 'lowpaymentfee' 'lowpaymentfee.com':32,90 'maximum':75 'may':166 'name':163 'network':67 'no-api-key' 'openapi':199 'page':155,184 'paid':9,23 'particular':211 'pay':97 'pay-per-cal':96 'pay-per-call' 'pay-per-request endpoint' 'payment':40,61 'paywal':60,234 'per':11,25,79,98 'per-cal':10,24 'platform':91 'post':226 'premium':34 'price':124 'prompt':191 'protocol':41 'provid':33 'public':148 'rate':130 'relat':53,167 'render':186 'request':80,227 'request/response':202 'requir':135 'resourc':44 'retriev':171 'return':213 'schema':200 'sentiment':106 'servic':116 'settl':63 'share':119 'span':101 'spars':177 'specif':43,138 'stripe':4,18,50,169 'stripe invoice API' 'stripe-invoices' 'substant':194 'suggest':164 'suit':94 'summar':108 'unclear':161 'undocu':236 'unit':84 'usdc':14,28,69 'usdc-settlement' 'use':68 'util':115 'via':37 'wallet':190 'x402':2,16,39,59,217 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9aae3642-ea49-47f7-bdc3-58c90f16f8ab","listingId":"1b94fcef-4492-459d-9f85-a5ba7975afdf","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:04.936Z"}],"sources":[{"listingId":"1b94fcef-4492-459d-9f85-a5ba7975afdf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:04.936Z","lastSeenAt":"2026-04-25T07:03:30.202Z"}],"details":{"listingId":"1b94fcef-4492-459d-9f85-a5ba7975afdf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/5 \\\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":"x402 challenge returns 402 with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/5"},{"claim":"Platform 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/invoices/5"}],"useCases":["Retrieving or interacting with Stripe invoice data via a pay-per-call model","Programmatic access to invoice endpoints without API key management","Agent-driven payment flows using x402 and USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring Stripe invoice interaction without subscription overhead"],"notFor":["Users needing detailed API documentation or schemas before committing","High-volume use cases where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.659Z"},"updatedAt":"2026-04-25T07:03:30.202Z"}}