{"id":"92773ec5-5820-4d38-844e-917e22c4cd93","shortId":"QAgxgp","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/67`) behind an x402 payment wall. The provider operates a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services—all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint listed here costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals). Payment is made via an `X-PAYMENT` header using the x402 \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.\n\nDocumentation on the site is extremely thin—the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the `/stripe/invoices/67` resource actually returns or what input it expects. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what useful data or action this specific invoice endpoint provides.","tags":[],"capabilities":["x402-payment-gating","usdc-micropayment","base-network","stripe-invoice-access","per-call-billing","no-api-key-required"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Stripe invoice API","Base network API","lowpaymentfee","crypto-gated endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages render only 'Connect wallet' with no content","No OpenAPI or request/response schema provided","The specific endpoint /api/v1/stripe/invoices/67 is not listed among the provider's advertised API catalog — its purpose is unknown","Cannot verify what data or action this endpoint provides without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/67","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/67","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 zero documentation on what the endpoint does, what inputs it accepts, or what it returns. The docs/pricing/README pages are all empty wallet-connect stubs. The specific resource path (/stripe/invoices/67) is not listed among the provider's advertised APIs, making its purpose 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'/stripe/invoices/67':184 '0.02':91 '000':97 '20':96 '402':200 '6':103 'Base network API' 'Stripe invoice API' 'USDC micropayment API' 'accept':121 'access':135 'action':212 'actual':186 'advertis':134 'ai/ml':62 'analyt':61 'api':58,128,154 'application/json':126 'base':8,22,77,98 'base-network' 'behind':40 'broader':49 'call':12,26,57,142 'challeng':201 'connect':162 'content':168 'cost':88 'crypto-gated endpoint' 'data':60,65,210 'decim':104 'doc':152 'document':144,177,204 'dozen':52 'endpoint':6,20,30,85,120,194,216 'exact':117 'expect':192 'explan':180 'expos':33 'extrem':149 'finance/web3':64 'gate':3,17,70 'grant':137 'header':113 'infer':63 'input':190 'invoic':5,19,37,215 'key':129 'limit':132 'list':86 'live':196 'lowpaymentfee' 'lowpaymentfee.com':32 'made':107 'maxamountrequir':94 'micropay':143 'network':78 'no-api-key-required' 'offer':51 'openapi':172 'oper':47 'page':157 'pay':9,23,55 'pay-per-cal':54 'pay-per-call API' 'payment':43,105,112 'per':11,25,56,92,141 'per-cal':10,24,140 'per-call-billing' 'platform':50 'post':122 'price':153 'prompt':164 'protocol':74 'provid':46,217 'pure':138 'rate':131 'readm':156 'render':159 'request':93,123 'request/response':175 'resourc':38,185 'return':125,187,197 'schema':176 'scheme':118 'servic':68 'settl':80 'site':147 'span':59 'spec':173 'specif':35,84,214 'stripe':4,18,36 'stripe-invoice-access' 'substant':167 'thin':150 'unclear':207 'unit':99 'usdc':14,28,82,101 'usdc-micropayment' 'use':114,209 'util':67 'valid':199 'via':71,108 'wall':44 'wallet':163 'without':203 'x':111 'x-payment':110 'x402':2,16,42,73,116 'x402 API' 'x402-gated':1,15 'x402-payment-gating'","prices":[{"id":"41aedb46-898a-4b34-8921-29134978ff84","listingId":"92773ec5-5820-4d38-844e-917e22c4cd93","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:08.547Z"}],"sources":[{"listingId":"92773ec5-5820-4d38-844e-917e22c4cd93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:08.547Z","lastSeenAt":"2026-04-25T05:33:15.593Z"}],"details":{"listingId":"92773ec5-5820-4d38-844e-917e22c4cd93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/67 \\\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":"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/invoices/67"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic retrieval of Stripe invoice data via micropayment","Agent-driven access to payment-gated resources without API key management","Demonstrating x402 protocol integration for per-call billing"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-use API access on Base","Projects exploring crypto-micropayment-gated API patterns"],"notFor":["Production use cases requiring documented request/response schemas","Users who need bulk or subscription-based Stripe invoice access","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.542Z"},"updatedAt":"2026-04-25T05:33:15.593Z"}}