{"id":"ea14ab7c-419e-420c-a2b0-49488d6b602d","shortId":"J8UFtN","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 wall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The specific resource path (`/api/v1/stripe/invoices/65`) suggests it relates to Stripe invoice data, though no documentation beyond the generic title \"Premium API Access\" is available for this particular endpoint.\n\nThe parent site lowpaymentfee.com hosts a collection of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services. All endpoints use the x402 protocol for payment, settling in USDC on the Base L2 network. The site advertises $0.02 per request across its catalog, with no API keys, no rate limits, and instant access. This specific endpoint's x402 challenge indicates a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide 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 this particular invoice endpoint returns or what input it expects. The endpoint accepts POST requests and returns application/json according to the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for this endpoint","The specific purpose of /api/v1/stripe/invoices/65 is undocumented; 'Premium API Access' is a generic label","No request body schema or response examples available","Cannot verify what data this endpoint actually returns after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/65","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/65","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 schema, no request/response examples, no documentation for this specific endpoint, and the docs pages are empty. The purpose of the '/stripe/invoices/65' path is unclear — it could be a demo or a real invoice retrieval endpoint. Effectively a stub 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'0.02':133,170 '000':161 '20':160 '402':49 '6':166 'Base network API' 'USDC micropayment API' 'accept':225 'access':36,78,148 'accord':231 'across':136 'advertis':132 'ai/ml':101 'amount':158 'analysi':104 'analyt':100 'api':35,77,97,141,184 'application/json':230 'avail':80 'base':8,22,55,127,162 'base-network' 'behind':37 'beyond':72 'call':12,26,43 'catalog':138 'challeng':50,154,235 'classif':106 'collect':91 'connect':193 'consist':171 'content':199 'crypto payment API' 'data':68,99,110 'decim':167 'descript':210 'doc':183 'document':71,178 'embed':107 'endpoint':6,20,30,84,115,151,216,224 'equal':169 'exampl':207 'expect':222 'extrem':180 'finance/crypto':108 'gate':3,17 'generic':74 'host':89 'indic':155 'infer':102 'input':220 'instant':147 'invoic':5,19,67,215 'json-response' 'key':142 'l2':128 'limit':145 'lowpaymentfee' 'lowpaymentfee.com':32,88 'market':109 'max':157 'metadata':236 'network':56,129 'no-api-key' 'openapi':203 'page':188 'parent':86 'particular':83,214 'path':60 'pay':10,24,94 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':93 'payment':40,45,121 'per':11,25,95,134 'post':226 'premium':34,76 'price':177,185 'prompt':195 'protocol':119 'provid':33 'rate':144 'readm':187 'relat':64 'render':190 'request':51,96,135,227 'request/response':206 'resourc':59 'return':47,217,229 'schema':204 'sentiment':103 'servic':113 'settl':122 'site':87,131,175 'site-wid':174 'span':98 'spars':181 'specif':58,150 'stripe':4,18,66 'stripe invoice API' 'stripe-invoices' 'substant':198 'suggest':62 'summar':105 'though':69 'titl':75 'unit':163 'usdc':14,28,52,124,165 'usdc-settlement' 'use':116 'util':112 'wall':41 'wallet':194 'wide':176 'without':44 'x402':2,16,39,118,153,234 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6687ed58-66a4-406c-b41a-81dbb46c1562","listingId":"ea14ab7c-419e-420c-a2b0-49488d6b602d","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:06.149Z"}],"sources":[{"listingId":"ea14ab7c-419e-420c-a2b0-49488d6b602d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:06.149Z","lastSeenAt":"2026-04-25T07:03:30.249Z"}],"details":{"listingId":"ea14ab7c-419e-420c-a2b0-49488d6b602d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/65 \\\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 endpoint returns a 402 challenge requesting USDC on Base network with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/65"},{"claim":"The site advertises $0.02 per request across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/65"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a single pay-per-call request","Programmatic access to invoice information without API key management","Agent-driven invoice lookups settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents that can settle x402 payments in USDC on Base","Quick one-off invoice lookups without subscription commitments"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-volume invoice processing where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.649Z"},"updatedAt":"2026-04-25T07:03:30.249Z"}}