{"id":"a349bdba-f428-4560-bee0-d3844185bc0e","shortId":"VjKUau","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 specific Stripe invoice resource (`/api/v1/stripe/invoices/179`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts POST requests and returns JSON.\n\nThe parent site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion). All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific endpoint being listed here (`/api/v1/stripe/invoices/179`) is not among the publicly advertised catalog entries and its x402 challenge shows a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's uniform pricing.\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 description of what data this particular invoice endpoint returns. The endpoint is live and responding with a valid x402 challenge, but the actual functionality behind the paywall is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-call","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-request endpoint","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","This specific endpoint (/api/v1/stripe/invoices/179) is not listed in the site's public API catalog; its purpose and response format are unknown.","No OpenAPI schema or example responses are provided anywhere.","The endpoint appears to serve a single fixed resource (invoice 179) rather than a parameterized API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/179","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/179","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, but there is zero documentation on what the endpoint actually returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The specific resource path (/stripe/invoices/179) is not listed in the site's public catalog, making its purpose 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'0.02':106,154 '000':145 '20':144 '402':51 '6':150 'Base network API' 'USDC micropayment API' 'accept':61 'actual':216 'advertis':71,133 'ai/ml':84 'among':130 'analysi':87 'analyt':83 'api':80,111,168 'base':8,22,57,146 'behind':40,218 'broad':73 'call':12,26,45,79 'catalog':74,134 'challeng':52,139,213 'classif':89 'commit':118 'connect':177 'consist':155 'content':183 'convers':99 'data':82,93,197 'decim':151 'descript':194 'doc':167 'document':162 'embed':90 'endpoint':6,20,30,60,102,123,201,204 'entri':135 'equal':153 'exampl':191 'expos':33 'extrem':164 'finance/crypto':91 'function':217 'gate':3,17 'geocod':97 'howev':120 'infer':85 'invoic':5,19,37,200 'json':66 'json-response' 'key':112 'limit':115 'list':101,125 'live':206 'lowpaymentfee' 'lowpaymentfee.com':32,70 'market':92 'maxamountrequir':142 'network':58 'openapi':187 'page':172 'paid':9,23 'parent':68 'particular':199 'pay':77 'pay-per-cal':76 'pay-per-call' 'pay-per-request endpoint' 'payment':47 'paywal':43,220 'per':11,25,78,107 'per-cal':10,24 'post':62 'price':104,161,169 'prompt':179 'public':132 'rate':114 'readm':171 'render':174 'request':53,63,108 'request/response':190 'requir':119 'resourc':38 'respond':208 'return':49,65,202 'schema':188 'sentiment':86 'servic':96 'show':140 'site':69,158 'span':81 'spars':165 'specif':35,122 'stripe':4,18,36 'stripe invoice API' 'stripe-invoice' 'substant':182 'summar':88 'unclear':222 'uniform':160 'unit':147 'usdc':14,28,54,149 'usdc-base' 'util':95 'valid':98,211 'wallet':178 'without':46 'x402':2,16,42,138,212 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9bf594de-edcf-486c-941a-81f40cbd90e8","listingId":"a349bdba-f428-4560-bee0-d3844185bc0e","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:46.847Z"}],"sources":[{"listingId":"a349bdba-f428-4560-bee0-d3844185bc0e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:46.847Z","lastSeenAt":"2026-04-25T11:32:47.272Z"}],"details":{"listingId":"a349bdba-f428-4560-bee0-d3844185bc0e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/179 \\\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 site advertises all endpoints at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/179"},{"claim":"The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data (invoice #179) via a micropayment-gated call","Programmatic access to invoice details without traditional API key authentication","Agent-driven payment and data retrieval in a single HTTP round-trip"],"bestFor":["Agents or scripts that need to fetch specific Stripe invoice data and can pay per-call in USDC","Developers exploring x402 payment protocol integrations","Use cases where keyless, pay-as-you-go API access is preferred"],"notFor":["Bulk invoice retrieval or batch processing (single-resource endpoint)","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.527Z"},"updatedAt":"2026-04-25T11:32:47.272Z"}}