{"id":"c724bfb0-011c-45b8-8f1f-b76bdb4514db","shortId":"g7T74t","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/46` accepts POST requests and returns `application/json`. The x402 challenge indicates 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 uniform $0.02/request pricing across all endpoints. Payment is made via the x402 \"exact\" scheme to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what this particular endpoint actually returns. The endpoint path suggests it may relate to Stripe invoice data, but this is speculative. The platform advertises no API keys, no rate limits, and instant access.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-micropayment","json-response","post-method"],"categories":["api","payments"],"synonyms":["stripe invoice API","x402 paid API","micropayment API","Base USDC API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The purpose of /api/v1/stripe/invoices/46 is unclear — the endpoint name suggests Stripe invoice data but this is unconfirmed","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/46","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what the endpoint actually returns. This is effectively a stub 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'/request':123 '0.02':108,122 '000':98 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':103 '20':97 '300':144 '6':113 'Base USDC API' 'accept':83 'access':6,20,36,212 'across':125 'actual':184 'address':138 'advertis':53,203 'ai':60 'analyt':59 'api':5,19,35,152,205 'application/json':88 'base':8,22,75,99,105 'behind':37 'broad':55 'call':12,26 'catalog':56 'challeng':91 'confirm':120 'connect':161 'content':167 'cost':95 'data':58,196 'decim':114 'descript':178 'doc':151 'document':146 'endpoint':30,46,81,127,183,187 'equal':107 'exact':134 'extrem':148 'financ':63 'gate':3,17,69 'indic':92 'infrastructur':66 'instant':211 'invoic':195 'json-response' 'key':206 'land':118 'learn':62 'limit':209 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':61 'made':130 'mani':45 'maximum':94 'may':191 'micropay':72 'micropayment API' 'network':76 'offer':47 'one':43 'openapi':171 'page':119,156 'paid':9,23 'particular':182 'path':188 'pay-per-call API' 'payment':128 'paywal':40 'per':11,25,109 'per-cal':10,24 'per-call-micropayment' 'platform':51,116,202 'post':84 'post-method' 'premium':4,18,34 'price':124,153 'prompt':163 'provid':33 'rate':208 'readm':155 'relat':192 'render':158 'request':85,110 'request/response':174 'return':87,185 'schema':175 'scheme':135 'second':145 'span':57 'spars':149 'spec':172 'specif':80 'specul':200 'stripe':194 'stripe invoice API' 'suggest':189 'timeout':142 'uniform':121 'unit':100 'usdc':14,28,78,102,111 'usdc-base' 'use':77,112 'util':67 'via':70,131 'wallet':162 'web3':64 'x402':2,16,39,71,90,133 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"04164d9d-be0f-4ca0-a045-a987f36e5fcd","listingId":"c724bfb0-011c-45b8-8f1f-b76bdb4514db","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:07.338Z"}],"sources":[{"listingId":"c724bfb0-011c-45b8-8f1f-b76bdb4514db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:07.338Z","lastSeenAt":"2026-04-22T07:01:26.262Z"}],"details":{"listingId":"c724bfb0-011c-45b8-8f1f-b76bdb4514db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/46\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/46"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Programmatic retrieval of invoice or payment-related data","Agent-driven API consumption without API keys or subscriptions"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.648Z"},"updatedAt":"2026-04-22T07:01:26.262Z"}}