{"id":"c049c769-dafa-45b4-ba3e-97f44c0d68d6","shortId":"FUEUaA","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 exposes a Stripe invoice resource (`/api/v1/stripe/invoices/49`) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC.\n\nThe specific endpoint listed here is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed USDC transfer to the provider's address on Base. No API keys, rate limits, or upfront commitments are required — each call is independently paid.\n\nThe platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve but render only a \"Connect wallet\" prompt, so there is no publicly available technical documentation describing request/response schemas, required POST body fields, or example outputs for this invoice endpoint. The x402 challenge confirms the endpoint is live and accepting POST requests, but the actual behavior and returned data structure remain undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","Request body schema for the POST is unknown; no examples provided by the provider","Response schema and content type are undocumented","The specific purpose of '/api/v1/stripe/invoices/49' (a hardcoded invoice ID) is unclear — it may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request/response schemas, required POST body, or what data the endpoint actually returns. All doc pages render only a wallet-connect prompt. This is effectively a stub 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'/api/v1/stripe/invoices/49':38 '/docs':148 '/pricing':149 '/readme':151 '0.02':89 '000':93 '20':92 '6':99 'Base network API' 'USDC micropayment API' 'accept':192 'access':86 'actual':197 'address':125 'ai/ml':62 'analyt':61 'api':58,85,129 'avail':166 'base':8,22,73,94,127 'base-network' 'behavior':198 'behind':39 'bodi':174 'broader':48 'call':12,26,139 'caller':109 'challeng':185 'commit':135 'confirm':186 'connect':158 'cost':88 'crawl':207 'data':60,65,201 'decim':100 'describ':169 'document':146,168 'dozen':52 'endpoint':6,20,30,79,182,188 'exact':107 'exampl':177 'expos':33 'field':175 'finance/web3':64 'gate':3,17 'header':115 'includ':110 'independ':141 'infer':63 'invoic':5,19,36,181 'key':130 'label':83 'limit':132 'list':80 'live':190 'lowpaymentfee' 'lowpaymentfee.com':32 'made':103 'materi':208 'network':74 'no-api-key' 'offer':51 'output':178 'page':147 'paid':9,23,142 'part':45 'pay':55 'pay-per-call invoice' 'pay-per-request':54 'payment':101,114 'paywal':42 'per':11,25,56,90 'per-cal':10,24 'platform':49,144 'post':173,193 'premium':84 'prompt':160 'provid':123 'public':165 'rate':131 'remain':203 'render':155 'request':57,91,194 'request/response':170 'requir':137,172 'resolv':153 'resourc':37 'return':200 'schema':171 'scheme':108 'servic':68 'settl':70 'sign':118 'span':59 'specif':78 'stripe':4,18,35 'stripe invoice API' 'stripe-invoices' 'structur':202 'technic':167 'transfer':120 'undocu':204 'unit':95 'upfront':134 'usdc':14,28,76,97,119 'usdc-settlement' 'use':75 'util':67 'via':104 'wallet':159 'x':113 'x-payment':112 'x402':2,16,41,106,184 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"06589903-62b8-42df-b3ac-b9df2602ec86","listingId":"c049c769-dafa-45b4-ba3e-97f44c0d68d6","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:57.696Z"}],"sources":[{"listingId":"c049c769-dafa-45b4-ba3e-97f44c0d68d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:57.696Z","lastSeenAt":"2026-04-25T08:33:11.622Z"}],"details":{"listingId":"c049c769-dafa-45b4-ba3e-97f44c0d68d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/49 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/49"},{"claim":"Platform 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/49"},{"claim":"Documentation, pricing, API, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically retrieving or interacting with a Stripe invoice via a crypto-paid API call","Integrating invoice data into an agent workflow without traditional API key provisioning","Demonstrating x402 payment protocol integration with a real endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-call access to invoice data","Projects requiring USDC-settled API calls without subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume invoice processing where per-call fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.043Z"},"updatedAt":"2026-04-25T08:33:11.622Z"}}