{"id":"fbc4cc85-54cd-46af-97ca-cfced852f48d","shortId":"PfuT3C","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 access to a Stripe invoice resource (invoice #183) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/invoices/183` is labeled \"Premium API Access\" and accepts HTTP POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address) and must attach a valid X-PAYMENT header to complete the transaction. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the invoice endpoint actually returns. The exact purpose of retrieving \"Stripe invoice 183\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required API","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","The /docs, /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')","The specific purpose of '/api/v1/stripe/invoices/183' is unclear — it may be a demo or placeholder","No examples of request body or response body are available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/183","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/183","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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of this specific invoice endpoint is unclear. The docs, pricing, and README pages are all empty 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'/api/v1/stripe/invoices/183':90 '/docs':201 '/pricing':203 '/readme':205 '0.02':10,24,76,149,188 '000':140 '183':41,244 '20':139 '402':111 '402 payment required API' '6':145 'Base network API' 'USDC pay-per-call' 'accept':97 'access':34,95,158 'actual':235 'addit':167 'address':120 'advertis':157,166 'ai/ml':66 'amount':118,136 'analysi':171 'analyt':65 'api':62,94,151 'asset':117 'attach':123 'avail':248 'base':8,22,85,141 'behind':42 'beyond':193 'broader':51 'call':61 'caller':108 'challeng':112 'classif':174 'complet':131 'connect':211 'contain':113 'content':217 'crypto-gated API' 'data':64,69 'decim':146 'document':192,226 'embed':175 'endpoint':6,20,30,89,168,234 'equal':148 'exact':238 'exampl':229 'exchang':178 'extrem':198 'feed':177 'finance/web3':68 'gate':3,17,160 'geocod':180 'handl':103 'header':129 'howev':191 'http':98 'infer':67 'invoic':5,19,38,40,233,243 'key':152 'label':92 'land':195 'limit':155 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':249 'max':135 'micropay':163 'must':122 'network':86 'no-api-key' 'offer':54 'openapi':221 'page':196,206 'paramet':116 'part':48 'pay':9,23,59 'pay-per-cal':58 'pay-per-call' 'payment':101,115,128 'payto':119 'paywal':45 'per':13,27,60,77 'platform':52,165 'point':190 'post':99 'premium':93 'price':74,176,189 'prompt':213 'protocol':107 'provid':33 'pure':161 'purpos':239 'rate':154,179 'receiv':109 'request':14,28,78,100 'request/response':224 'requir':137 'resourc':39 'retriev':241 'return':208,236 'schema':225 'sentiment':170 'servic':72 'settl':80 'span':63 'spars':199 'spec':222 'specif':88 'stripe':4,18,37,242 'stripe invoice API' 'stripe-invoice' 'substant':216 'summar':173 'text':172 'transact':133 'unclear':246 'unit':142 'usdc':12,26,82,144 'usdc-base' 'util':71 'valid':125,181 'varieti':56 'via':104 'wallet':212 'x':127 'x-payment':126 'x402':2,16,44,106 'x402 micropayment' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"cb61898f-2d10-4637-9c8b-35374a31c5ca","listingId":"fbc4cc85-54cd-46af-97ca-cfced852f48d","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/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:51.694Z"}],"sources":[{"listingId":"fbc4cc85-54cd-46af-97ca-cfced852f48d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:51.694Z","lastSeenAt":"2026-04-25T10:03:27.439Z"}],"details":{"listingId":"fbc4cc85-54cd-46af-97ca-cfced852f48d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/183 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/183"},{"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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/183"}],"useCases":["Programmatically retrieving a Stripe invoice record via micropayment","Agent-driven invoice lookup without traditional API key authentication","Demonstrating x402 protocol payment flows for invoice data"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need one-off invoice data without subscription commitments","Testing micropayment-gated API integrations on Base"],"notFor":["Bulk invoice processing requiring thousands of calls (no documented batch endpoint)","Users needing detailed API documentation or response schema guarantees","Production systems requiring SLA or uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.354Z"},"updatedAt":"2026-04-25T10:03:27.439Z"}}