{"id":"e5baba85-73a8-49ef-85c6-c16bb9047f19","shortId":"wzTM4r","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 exposes a Stripe invoice resource (`/api/v1/stripe/invoices/53`) behind an x402 payment challenge. 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 gated via the x402 protocol on the Base network, settled in USDC.\n\nThe specific endpoint listed here is labeled \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact scheme to a designated wallet address on Base. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call USDC micropayments.\n\nDocumentation on the site is extremely thin — 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 description of what the Stripe invoices endpoint actually returns or what parameters it accepts. The platform's landing page lists many endpoints at $0.02 each but provides no detail on input/output schemas for any of them. The exact purpose of retrieving or interacting with \"Stripe invoice 53\" is unclear from available materials.","tags":[],"capabilities":["x402-payment-gating","usdc-micropayment","base-network","stripe-invoice-access","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Stripe invoice API","Base network API","lowpaymentfee","402 payment required"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request parameters and response format are unknown","The purpose of 'Stripe invoice 53' is unclear — it may be a demo or placeholder resource","No information on uptime, SLAs, or rate limits beyond marketing claims of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts payments. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs pages are empty. This is effectively a stub 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'0.02':97,111,211 '000':103 '20':102 '402 payment required' '53':234 '6':109 'Base network API' 'Stripe invoice API' 'USDC pay-per-call' 'accept':129,201 'access':92,143 'actual':195 'address':124 'advertis':142 'ai/ml':63 'analyt':62 'api':59,91,136,162 'application/json':134 'avail':238 'base':8,22,78,104,126 'base-network' 'behind':39 'broader':49 'call':12,26,150 'challeng':43 'connect':171 'content':177 'cost':94 'data':61,66 'decim':110 'descript':188 'design':122 'detail':216 'doc':161 'document':153 'dozen':53 'endpoint':6,20,30,85,128,194,209 'exact':118,225 'exampl':185 'expos':33 'extrem':158 'finance/web3':65 'gate':3,17,71 'grant':145 'infer':64 'input/output':218 'interact':230 'invoic':5,19,36,193,233 'key':137 'label':89 'land':205 'limit':140 'list':86,207 'lowpaymentfee' 'lowpaymentfee.com':32 'made':114 'mani':208 'materi':239 'maxamountrequir':100 'micropay':152 'micropayment API' 'network':79 'no-api-key' 'offer':52 'openapi':181 'page':166,206 'paramet':199 'part':46 'pay':10,24,56 'pay-per-cal':9,23 'pay-per-request':55 'payment':42,112 'per':11,25,57,98,149 'per-cal':148 'platform':50,203 'post':130 'premium':90 'price':163 'prompt':173 'protocol':75 'provid':214 'pure':146 'purpos':226 'rate':139 'readm':165 'render':168 'request':58,99,131 'request/response':184 'resourc':37 'retriev':228 'return':133,196 'schema':182,219 'scheme':119 'servic':69 'settl':80 'site':156 'span':60 'specif':84 'stripe':4,18,35,192,232 'stripe-invoice-access' 'substant':176 'thin':159 'unclear':236 'unit':105 'usdc':14,28,82,107,151 'usdc-micropayment' 'util':68 'via':72,115 'wallet':123,172 'x402':2,16,41,74,117 'x402 API' 'x402-gated':1,15 'x402-payment-gating'","prices":[{"id":"e44579db-6abe-45ea-a3a1-3542e41e6b13","listingId":"e5baba85-73a8-49ef-85c6-c16bb9047f19","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:00.095Z"}],"sources":[{"listingId":"e5baba85-73a8-49ef-85c6-c16bb9047f19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:00.095Z","lastSeenAt":"2026-04-25T08:33:11.768Z"}],"details":{"listingId":"e5baba85-73a8-49ef-85c6-c16bb9047f19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/53"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/53"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically accessing a Stripe invoice record via micropayment","Demonstrating x402 payment-gated API access on Base","Agent-driven invoice retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment protocols","Agents that need keyless, pay-per-call API access on Base","Projects exploring USDC micropayment-gated endpoints"],"notFor":["Production Stripe invoice management (unclear what data is returned)","Users needing detailed API documentation or guaranteed SLAs","Bulk invoice processing at scale (per-call payment model)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.888Z"},"updatedAt":"2026-04-25T08:33:11.768Z"}}