{"id":"7e56cd52-2786-406c-8259-406241285ac3","shortId":"qzK52u","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/31` appears to be part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories — all priced at $0.02 per call settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the \"exact\" scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The endpoint returns `application/json`.\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 specific invoice endpoint returns or what parameters it accepts. The platform advertises no API keys, no rate limits, and instant access, but the actual behavior and output of this particular endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","stripe-invoices","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No request or response schema documented — actual endpoint behavior is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/stripe/invoices/31 is unclear — 'Premium API Access' is a generic label","No OpenAPI specification available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what this specific invoice endpoint actually returns. Docs pages are empty beyond a wallet-connect prompt. No OpenAPI spec or examples are 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'0.02':10,24,73,122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':104 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':108 '20000':114 '6':119 'Base network API' 'USDC micropayment API' 'accept':92,171 'access':36,183 'across':60 'actual':186 'address':103 'advertis':174 'ai/ml':63 'analyt':62 'api':35,59,133,176 'appear':46 'application/json':126 'base':8,22,81,110,115 'behavior':187 'behind':37 'broader':52 'call':75 'categori':69 'challeng':85 'confirm':86 'connect':142 'content':148 'contract':107 'data':61 'decim':120 'descript':159 'doc':132 'document':127 'endpoint':6,20,30,88,124,165,193 'equal':121 'exact':100 'extrem':129 'finance/web3':65 'gate':3,17 'infer':64 'infrastructur':67 'instant':182 'invoic':5,19,164 'json-response' 'key':177 'limit':180 'live':90 'lowpaymentfee' 'lowpaymentfee.com':32 'made':97 'maxamountrequir':112 'network':82 'no-api-key' 'offer':54 'openapi':152 'output':189 'page':137 'paramet':169 'part':49 'particular':192 'pay':9,23,56 'pay-per-call API' 'pay-per-request':55 'payment':40,95 'per':13,27,57,74 'platform':53,173 'post':93 'premium':34 'price':71,134 'prompt':144 'provid':33 'rate':179 'readm':136 'remain':194 'render':139 'request':14,28,58,94 'request/response':155 'resourc':44 'return':125,166 'schema':156 'scheme':101 'settl':76 'spars':130 'spec':153 'specif':43,163 'stripe':4,18 'stripe invoice API' 'stripe-invoices' 'undocu':195 'unit':116 'usdc':12,26,78,106 'usdc-base' 'use':105 'util':68 'via':98 'wall':41 'wallet':143 'x402':2,16,39,84 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"93239d30-2c29-4944-86a7-1fe0fbe1810c","listingId":"7e56cd52-2786-406c-8259-406241285ac3","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:00.704Z"}],"sources":[{"listingId":"7e56cd52-2786-406c-8259-406241285ac3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:00.704Z","lastSeenAt":"2026-04-25T08:33:11.731Z"}],"details":{"listingId":"7e56cd52-2786-406c-8259-406241285ac3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/31 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/31"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/31"}],"useCases":["Retrieving Stripe invoice data via a single paid API call","Integrating pay-per-request invoice lookups into agent workflows","Accessing premium financial data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access","Quick one-off invoice data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch processing where per-request pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.966Z"},"updatedAt":"2026-04-25T08:33:11.731Z"}}