{"id":"7ee0f675-5beb-4b03-a0f9-726980f0fd93","shortId":"fZ6Zab","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying with USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying with 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/161` appears to be one of many pay-per-call endpoints offered by the lowpaymentfee.com platform. The x402 challenge confirms it is live and accepts payment in USDC (contract 0x8335…2913) on the Base network, with a maximum amount of 20,000 base units — which, at 6 decimals for USDC, equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a range of API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific endpoint in this listing (`/api/v1/stripe/invoices/161`) is labeled \"Premium API Access\" and does not clearly map to any of those documented categories.\n\nDocumentation is extremely thin — 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 usage examples available. The actual functionality behind this particular invoice endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","no-api-key","stripe-invoices"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","stripe invoice API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The specific endpoint '/api/v1/stripe/invoices/161' is not listed among the platform's documented API categories — its actual functionality is unclear","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/161","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/161","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 no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of the '/stripe/invoices/161' resource is undocumented. Docs pages return only a wallet-connect 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'0.02':95,147 '000':85 '0x8335':73 '20':84 '2913':74 '6':90 'Base network API' 'USDC API' 'accept':68 'access':34,173 'actual':221 'advertis':102 'ai':116 'amount':82 'analysi':120 'analyt':110 'api':33,106,152,172,191 'appear':44 'avail':219,232 'base':8,21,77,86 'base-network' 'behind':35,223 'broader':99 'call':53 'categori':107,184 'challeng':62 'classif':123 'clear':177 'commit':159 'confirm':63 'connect':200 'content':206 'contract':72 'convers':140 'data':109,113 'decim':91 'doc':190 'document':183,185 'embed':124 'endpoint':6,19,28,54,143,164,227 'equal':94 'estim':134 'exampl':218 'exchang':129 'export':114 'extrem':187 'feed':128 'financ':125 'function':222 'gas':133 'gate':3,16 'generat':141 'geocod':138 'howev':161 'includ':108 'infrastructur':136 'insight':115 'invoic':5,18,226 'key':153 'label':170 'learn':118 'limit':156 'list':145,167 'live':66 'lowpaymentfee' 'lowpaymentfee.com':30,58,100 'machin':117 'mani':49 'map':178 'materi':233 'maximum':81 'metric':111 'micropayment API' 'network':78 'no-api-key' 'offer':55 'one':47 'openapi':210 'page':195 'particular':225 'pay':9,22,51 'pay-per-cal':50 'pay-per-call API' 'pay-per-request' 'payment':38,69 'per':12,25,52,96,148 'platform':59,101 'premium':32,171 'price':127,192 'prompt':202 'provid':31 'quot':132 'rang':104 'rate':130,155 'readm':194 'render':197 'report':112 'request':13,26,97,149 'request/response':213 'requir':160 'resourc':42 'schema':214 'sentiment':119 'spec':211 'specif':41,163 'stripe':4,17 'stripe invoice API' 'stripe-invoices' 'summar':122 'text':121 'thin':188 'token':131 'unclear':229 'unit':87 'usag':217 'usdc':11,24,71,93 'usdc-payment' 'util':137 'valid':139 'wall':39 'wallet':201 'web3':126 'x402':2,15,37,61 'x402 API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"c5bc74d1-f98d-447a-8e27-25cf7deeee35","listingId":"7ee0f675-5beb-4b03-a0f9-726980f0fd93","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:39.048Z"}],"sources":[{"listingId":"7ee0f675-5beb-4b03-a0f9-726980f0fd93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:39.048Z","lastSeenAt":"2026-04-25T13:03:04.147Z"}],"details":{"listingId":"7ee0f675-5beb-4b03-a0f9-726980f0fd93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/161\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/161"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a Stripe invoice resource via x402 micropayment on Base","Agent-driven pay-per-call API consumption without API key management","Programmatic invoice retrieval settled in USDC"],"bestFor":["Agents or scripts that need keyless, pay-per-use API access","Developers experimenting with x402 payment protocol on Base","Use cases requiring low-friction micropayments ($0.02/call)"],"notFor":["Users needing well-documented API contracts with full request/response schemas","High-volume use cases where per-request crypto payments add overhead","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.973Z"},"updatedAt":"2026-04-25T13:03:04.147Z"}}