{"id":"b18a99c1-881b-4ae1-bd48-ad24898d1a96","shortId":"dHbw4k","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/144`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe price per request is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout. The provider's landing page advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance, and utility services — all at the same $0.02/request price point with no API keys, no rate limits, and no commitments.\n\nHowever, this particular endpoint (`/stripe/invoices/144`) is not listed among the advertised APIs on the homepage. Its actual response payload is unknown — the title \"Premium API Access\" and the Stripe-invoice-style path suggest it may return invoice data or serve as a payment/billing resource, but no documentation, schema, or example responses are available. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","per-call-pricing","json-response","http-post"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","This specific endpoint (/api/v1/stripe/invoices/144) is not listed among the provider's advertised API catalog on the homepage.","Response schema and payload structure are completely unknown.","No OpenAPI spec or machine-readable schema is published.","The purpose and contents of 'invoice 144' are opaque — could be test data or a placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/144","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/144","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 well-formed x402 challenge, but there is zero documentation on what the endpoint actually returns, no OpenAPI schema, no example responses, and the docs/pricing/README pages are empty. The specific invoice endpoint is not even listed among the provider's advertised APIs, making its purpose 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'/request':132 '/stripe/invoices/144':149 '0.02':84,131 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':94 '0x8335':78 '20':72 '2913':79 '300':101 '402':51 '6':88 'Base network API' 'USDC micropayment API' 'accept':61 'access':170 'actual':161 'advertis':109,155 'ai/ml':121 'among':153 'analyt':120 'api':117,137,156,169,201 'application/json':66 'avail':198 'base':8,22,57,74,81 'behind':40 'broad':111 'call':12,26,45 'catalog':112 'challeng':52 'commit':144 'connect':210 'content':216 'data':119,183 'decim':89 'doc':200 'document':192 'endpoint':6,20,30,60,148 'equal':83 'exact':97 'exampl':195 'expos':33 'financ':123 'gate':3,17,116 'given':85 'homepag':159 'howev':145 'http':62 'http-post' 'infer':122 'invoic':5,19,37,175,182 'json-response' 'key':138 'land':107 'limit':141 'list':152 'lowpaymentfee' 'lowpaymentfee.com':32 'may':180 'network':58 'page':108,205 'paid':9,23 'particular':147 'path':177 'pay-per-call API' 'payload':163 'payment':47,90 'payment/billing':188 'paywal':43 'per':11,25,69 'per-cal':10,24 'per-call-pricing' 'point':134 'post':63 'premium':168 'price':68,133,202 'prompt':212 'provid':105 'rate':140 'readm':204 'render':207 'request':53,70 'resourc':38,189 'respons':162,196 'return':49,65,181 'schema':193 'scheme':98 'second':102 'sent':92 'serv':185 'servic':126 'span':118 'specif':35 'stripe':4,18,36,174 'stripe invoice API' 'stripe-invoice' 'stripe-invoice-styl':173 'style':176 'substant':215 'suggest':178 'timeout':103 'titl':167 'unit':75 'unknown':165 'usdc':14,28,54,77,86 'usdc-base' 'use':95 'util':125 'wallet':211 'without':46 'x402':2,16,42,115 'x402 paid endpoint' 'x402-gated':1,15,114 'x402-payment'","prices":[{"id":"52abb8b6-195f-4998-a967-614ebd7d637f","listingId":"b18a99c1-881b-4ae1-bd48-ad24898d1a96","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:43.266Z"}],"sources":[{"listingId":"b18a99c1-881b-4ae1-bd48-ad24898d1a96","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:43.266Z","lastSeenAt":"2026-04-25T11:32:47.072Z"}],"details":{"listingId":"b18a99c1-881b-4ae1-bd48-ad24898d1a96","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/144 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/144"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/144"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The homepage lists APIs in categories: Data & Analytics, AI & ML, Finance & Web3, and Infrastructure — but does not list /stripe/invoices/144","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data (invoice #144) via a single micropayment","Programmatic access to invoice details without traditional API key management","Agent-driven payment and data retrieval in a single HTTP round-trip"],"bestFor":["Agents or services that need to fetch specific invoice data on-demand","Developers exploring x402 payment-gated API patterns on Base","Use cases where keyless, pay-per-call access is preferred over subscriptions"],"notFor":["Bulk invoice retrieval or batch processing (single-resource endpoint)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.751Z"},"updatedAt":"2026-04-25T11:32:47.072Z"}}