{"id":"b110b1de-08b7-47e6-926f-470dae4c5591","shortId":"RWjRCd","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment challenge. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all settled on the Base network using USDC via the x402 protocol.\n\nThe specific resource `/api/v1/stripe/invoices/109` appears to be a Stripe invoice-related endpoint. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments required. Payment is made via the x402 `exact` scheme, settling on-chain on Base.\n\nDocumentation beyond the landing page 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 spec, no request/response schema documentation, and no examples available. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual functionality behind the paywall is unclear beyond the generic \"Premium API Access\" label and the Stripe invoices path segment.","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 API","USDC micropayment API","Base network API","pay-per-call endpoint","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found; request and response formats are unknown","The specific purpose of /api/v1/stripe/invoices/109 is unclear — it may be a demo or placeholder endpoint","No agents.txt or robots.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/109","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/109","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation, no request/response examples, and the actual functionality behind the paywall is undocumented. The docs pages are empty stubs. This is effectively a stub 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'/api/v1/stripe/invoices/109':79 '/docs':162 '/pricing':164 '/readme':166 '/request':124 '0.02':108,123 '000':98 '0x8335':103 '20':97 '402':199 '6':113 'Base network API' 'USDC micropayment API' 'access':36,219 'across':55 'actual':207 'advertis':92 'ai/ml':58 'analyt':57 'api':35,54,129,218 'appear':80 'avail':191 'base':8,22,68,99,105,152 'base-network' 'behind':37,209 'beyond':154,214 'broader':47 'call':12,26 'chain':150 'challeng':41,91,204 'commit':137 'confirm':120,195 'connect':172 'content':178 'cost':95 'data':56 'decim':114 'document':153,187 'endpoint':6,20,30,88,193 'equal':107 'exact':145 'exampl':190 'extrem':159 'finance/web3':60 'flat':122 'function':208 'gate':3,17 'generic':216 'http':198 'infer':59 'infrastructur':62 'invoic':5,19,86,224 'invoice-rel':85 'key':130 'label':220 'land':118,156 'limit':133 'live':196 'lowpaymentfee' 'lowpaymentfee.com':32 'made':141 'maximum':94 'minimum':136 'model':126 'network':69 'no-api-key' 'offer':49 'on-chain':148 'openapi':182 'page':119,157,167 'part':44 'path':225 'pay':10,24,51 'pay-per-cal':9,23 'pay-per-call endpoint' 'pay-per-request':50 'payment':40,139 'paywal':211 'per':11,25,52,109 'platform':48,116 'premium':34,217 'price':125 'prompt':174 'protocol':75 'provid':33 'rate':132 'relat':87 'render':169 'request':53,110 'request/response':185 'requir':138 'resourc':78 'return':197 'schema':186 'scheme':146 'segment':226 'settl':65,147 'spars':160 'spec':183 'specif':77 'stripe':4,18,84,223 'stripe invoice API' 'stripe-invoices' 'substant':177 'unclear':213 'unit':100 'usdc':14,28,71,102,111 'usdc-settlement' 'use':70,112 'util':63 'valid':202 'via':72,142 'wallet':173 'x402':2,16,39,74,90,144,203 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"286a7a3e-5583-4294-aa9e-037710d42e01","listingId":"b110b1de-08b7-47e6-926f-470dae4c5591","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:27.689Z"}],"sources":[{"listingId":"b110b1de-08b7-47e6-926f-470dae4c5591","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:27.689Z","lastSeenAt":"2026-04-25T15:32:41.440Z"}],"details":{"listingId":"b110b1de-08b7-47e6-926f-470dae4c5591","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/109 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/109"},{"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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/109"}],"useCases":["Programmatically accessing Stripe invoice data via a pay-per-request model","Agent-driven invoice retrieval without API key management","On-chain micropayment-gated access to financial data"],"bestFor":["Agents that need one-off invoice lookups without subscription overhead","Developers exploring x402 payment-gated APIs on Base","Use cases where no-API-key, instant access is preferred"],"notFor":["High-volume invoice processing where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.419Z"},"updatedAt":"2026-04-25T15:32:41.440Z"}}