{"id":"2b651939-1c8e-4676-b5e4-9eb93066601c","shortId":"Ugvz9D","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific resource path (`/api/v1/stripe/invoices/168`) suggests it returns invoice or billing-related data, though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. The provider emphasizes a no-API-key, no-rate-limit, pay-per-use model with instant access.\n\nlowpaymentfee.com also hosts a broader catalog of x402-gated endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/stripe/invoices/168` resource. Documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","invoice-data","no-api-key","pay-per-use"],"categories":["finance","infrastructure"],"synonyms":["invoice API","stripe invoice","billing data","x402 endpoint","USDC micropayment","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","The specific resource path /api/v1/stripe/invoices/168 is not listed on the provider's landing page catalog, making its purpose unclear","No request or response schema is documented; integration requires trial-and-error","The endpoint path references a hardcoded invoice ID (168), which may be a static demo resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/168","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/168","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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of the /stripe/invoices/168 path is unclear — it could be a demo or placeholder resource. Effectively a stub 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'/request':109,170 '0.02':99,108,169 '000':88 '0x8335':73 '20':87 '2913':74 '6':94 'USDC micropayment' 'access':6,20,36,133 'across':111 'addit':206 'advertis':83 'ai/ml':148 'also':135 'analysi':151 'analyt':147 'api':5,19,35,120,192 'base':8,22,68,89 'base-network' 'behind':37 'beyond':183 'bill':52 'billing data' 'billing-rel':51 'broader':138 'catalog':139 'challeng':82 'classif':153 'connect':201 'consist':102 'contract':72 'convers':163 'convert':97 'cover':177 'data':54,146,157 'decim':95 'detail':208 'doc':191 'document':62,182 'embed':154 'emphas':116 'endpoint':30,113,144 'exact':57,78 'extrem':188 'finance/crypto':155 'gate':3,17,143 'generat':164 'geocod':161 'host':136 'howev':173 'infer':149 'instant':132 'invoic':49 'invoice API' 'invoice-data' 'key':121 'land':185 'limit':125 'list':176 'lowpaymentfee' 'lowpaymentfee.com':32,134 'market':156 'maxamountrequir':85 'model':130 'network':69 'no-api-key':118 'no-rate-limit':122 'page':186,196 'paid':9,23 'path':44 'pay':127 'pay-per-call API' 'pay-per-us':126 'pay-per-use' 'payload':59 'payment':63 'paywal':40 'per':11,25,100,128 'per-request':10,24 'per-request-billing' 'point':172 'premium':4,18,34 'price':110,171,193 'prompt':203 'provid':33,115 'rate':124 'readm':195 'relat':53 'render':198 'request':12,26,101 'resourc':43,181 'respons':58 'return':48 'scheme':79 'sentiment':150 'servic':160 'settl':65 'sinc':91 'site':105 'span':145 'spars':189 'specif':42,175 'stripe invoice' 'suggest':46 'summar':152 'technic':207 'though':55 'uniform':107 'unit':90 'usdc':14,28,71,92 'usdc-settlement' 'use':70,93,129 'util':159 'valid':162 'via':75 'wallet':202 'x402':2,16,39,77,81,142 'x402 endpoint' 'x402-gated':1,15,141 'x402-payment'","prices":[{"id":"9a5a73c9-ceed-4dca-a401-a2608c53d167","listingId":"2b651939-1c8e-4676-b5e4-9eb93066601c","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:47.450Z"}],"sources":[{"listingId":"2b651939-1c8e-4676-b5e4-9eb93066601c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:47.450Z","lastSeenAt":"2026-04-25T11:32:47.248Z"}],"details":{"listingId":"2b651939-1c8e-4676-b5e4-9eb93066601c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/168 \\\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":"maxAmountRequired is 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/168"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/168"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving invoice or billing data on a per-request basis without API key management","Programmatic access to premium content gated behind x402 micropayments","Agent-driven workflows that need to pay for and consume API data autonomously"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-use API access","Workflows requiring on-demand invoice or billing lookups"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who prefer subscription or bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.58Z"},"updatedAt":"2026-04-25T11:32:47.248Z"}}