{"id":"8634db8b-beb8-4dc0-81cd-1d3d39333a15","shortId":"DFjdEW","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides a Stripe invoice resource behind an x402 paywall. When called via POST at `/api/v1/stripe/invoices/80`, it returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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, settled in USDC on Base via the x402 protocol. The platform claims no API keys, no rate limits, no minimums, and instant access.\n\nThe specific endpoint being listed here (`/api/v1/stripe/invoices/80`) appears to be a Stripe invoice-related resource, but there is no documentation explaining what data it returns or what input it expects beyond a POST request. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without schema details or example responses, the actual functionality of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","stripe-invoices","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API","crypto-gated endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt with no content.","No request or response schema provided; the actual data returned by this endpoint is unknown.","The endpoint path suggests Stripe invoice data but no confirmation of what is returned exists in the crawl material.","The platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/80","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the docs pages are empty stubs. The purpose of this specific invoice endpoint is unclear beyond its URL 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'0.02':76,131 '000':67 '20':66 '402':51 '6':72 'Base network API' 'USDC micropayment API' 'access':156 'actual':217 'advertis':83 'ai':100 'amount':63 'analysi':104 'analyt':94 'api':91,147,195 'appear':164 'base':8,22,59,68,138 'base-network' 'behind':38 'beyond':188 'broader':80 'call':12,26,43,90 'challeng':52 'claim':145 'classif':107 'connect':203 'content':209 'convers':124 'crypto-gated endpoint' 'data':93,97,180 'decim':73 'detail':212 'doc':193 'document':177 'embed':108 'endpoint':6,20,30,127,159,222 'equal':75 'estim':118 'exampl':214 'exchang':113 'expect':187 'explain':178 'export':98 'feed':112 'financ':109 'function':218 'gas':117 'gate':3,17 'generat':125 'geocod':122 'infrastructur':120 'input':185 'insight':99 'instant':155 'invoic':5,19,36,170 'invoice-rel':169 'key':148 'learn':102 'limit':151 'list':129,161 'lowpaymentfee' 'lowpaymentfee.com':32,81 'machin':101 'maximum':62 'metric':95 'minimum':153 'network':60 'page':198 'particular':221 'pay':10,24,88 'pay-per-cal':9,23,87 'pay-per-call' 'pay-per-request API' 'payment':54 'paywal':41 'per':11,25,77,89,132 'platform':82,144 'post':45,190 'post-endpoint' 'price':111,194 'prompt':205 'protocol':142 'provid':33 'quot':116 'rate':114,150 'readm':197 'relat':171 'remain':223 'report':96 'request':78,133,191 'requir':53,64 'resourc':37,172 'respons':215 'return':49,182,200 'schema':211 'sentiment':103 'settl':134 'span':92 'specif':158 'stripe':4,18,35,168 'stripe invoice API' 'stripe-invoices' 'substant':208 'suit':85 'summar':106 'text':105 'token':115 'unclear':224 'unit':69 'usdc':14,28,56,71,136 'usdc-settlement' 'util':121 'valid':123 'via':44,139 'wallet':204 'web3':110 'without':210 'x402':2,16,40,141 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"77075979-1488-416e-ab60-837056d2837a","listingId":"8634db8b-beb8-4dc0-81cd-1d3d39333a15","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:13.271Z"}],"sources":[{"listingId":"8634db8b-beb8-4dc0-81cd-1d3d39333a15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:13.271Z","lastSeenAt":"2026-04-25T05:33:15.810Z"}],"details":{"listingId":"8634db8b-beb8-4dc0-81cd-1d3d39333a15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/80\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 endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/80"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/80"},{"claim":"All 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 platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or generating Stripe invoice data via a single paid API call","Programmatic access to invoice resources without API key management","Agent-driven invoice lookups settled in USDC on Base"],"bestFor":["Developers who want keyless, pay-per-call access to invoice data","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-call pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.301Z"},"updatedAt":"2026-04-25T05:33:15.810Z"}}