{"id":"9f690241-5338-4744-81dc-ecd3d60b139a","shortId":"wBm6EL","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, payable in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, payable 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/33` appears to be a Stripe invoice-related endpoint, though the exact response payload is undocumented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe endpoint is live and returns a valid x402 challenge (version 1) when called via POST without payment. The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request. The provider's landing page confirms a flat $0.02/request pricing model across all their API offerings, with no API keys, no rate limits, and instant access advertised.\n\nThe provider hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, this specific listing covers only the `/api/v1/stripe/invoices/33` endpoint. Documentation beyond the landing page is effectively empty (all doc/pricing/API pages just show \"Connect wallet\"), so the exact request format and response schema for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","post-method","pay-per-request"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","crypto payment gateway"],"warnings":["No API documentation available — all doc pages show only 'Connect wallet'","No request body schema or response schema documented for this endpoint","The endpoint path '/api/v1/stripe/invoices/33' references a specific invoice ID (33), which may be a demo or placeholder rather than a general-purpose endpoint","The broader site lists many API categories but none match this specific Stripe invoices path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually returns. The docs, pricing, and API pages are all blank beyond a wallet-connect prompt. The purpose of 'Stripe invoices/33' is 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'/request':123 '0.02':111,122 '000':101 '0x8335':70 '1':88 '20':100 '2913':71 '6':108 'Base network API' 'USDC micropayment API' 'access':34,140 'across':126 'advertis':141 'ai/ml':153 'amount':97 'analysi':156 'analyt':152 'api':33,129,133,149 'appear':44 'base':8,21,65,102 'base-network' 'behind':35 'beyond':184 'broader':146 'call':90 'challeng':86 'classif':158 'confirm':119 'connect':196 'contract':69 'convers':173 'cover':178 'crypto payment gateway' 'data':151,161 'decim':109 'doc/pricing/api':192 'document':183 'effect':189 'embed':159 'empti':190 'endpoint':6,19,28,52,78,182,208 'equal':110 'estim':167 'exact':55,75,200 'exchang':164 'feed':163 'finance/crypto':160 'flat':121 'format':202 'gas':166 'gate':3,16 'geocod':171 'host':144 'howev':174 'infer':154 'infrastructur':169 'instant':139 'invoic':5,18,50 'invoice-rel':49 'key':134 'land':117,186 'limit':137 'list':177 'live':80 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':96 'model':125 'network':66 'offer':130 'page':118,187,193 'pay-per-call API' 'pay-per-request' 'payabl':9,22 'payload':57 'payment':38,60,94 'per':12,25,112 'post':92 'post-method' 'premium':32 'price':124,162 'provid':31,115,143 'rate':136,165 'relat':51 'remain':209 'request':13,26,113,201 'requir':98 'resourc':42 'respons':56,204 'return':82 'schema':205 'scheme':76 'sentiment':155 'settl':62 'show':195 'span':150 'specif':41,176 'stripe':4,17,48 'stripe invoice API' 'stripe-invoices' 'suit':147 'summar':157 'though':53 'undocu':59 'unit':103 'unknown':210 'usdc':11,24,68,105 'usdc-settlement' 'use':67 'util':170 'valid':84,172 'version':87 'via':72,91 'wall':39 'wallet':197 'without':93 'x402':2,15,37,74,85 'x402 paid endpoint' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"ea5e0871-c182-4616-a219-e3aa9b79dcc0","listingId":"9f690241-5338-4744-81dc-ecd3d60b139a","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:04.325Z"}],"sources":[{"listingId":"9f690241-5338-4744-81dc-ecd3d60b139a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:04.325Z","lastSeenAt":"2026-04-25T07:03:30.133Z"}],"details":{"listingId":"9f690241-5338-4744-81dc-ecd3d60b139a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/33 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/33"},{"claim":"Flat $0.02/request pricing, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/33"}],"useCases":["Programmatically accessing Stripe invoice data via a pay-per-request model without API keys","Agent-driven invoice retrieval settled in USDC on Base","Integrating invoice lookups into workflows that use x402-compatible payment clients"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schema before integrating","High-volume invoice processing where $0.02/request adds up significantly","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.759Z"},"updatedAt":"2026-04-25T07:03:30.133Z"}}