{"id":"8e0e6c14-6203-46fa-9e35-692249015d22","shortId":"gygJkb","kind":"x402","title":"x402-gated endpoint on Base that returns invoice data for 0.02 USDC per call.","tagline":"x402-gated endpoint on Base that returns invoice data for 0.02 USDC per call.","description":"This x402-protocol endpoint at lowpaymentfee.com provides access to a \"Premium API\" resource related to Stripe invoices. It accepts POST requests and returns JSON data upon payment of 0.02 USDC (USD Coin) on the Base network. The payment is settled on-chain to the specified wallet address using the exact payment scheme.\n\nThe endpoint is live and responds with a standard x402 challenge (version 1) when no payment header is provided. The asset used for payment is USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount required of 20,000 base units (0.02 USDC given 6 decimals). The maximum timeout for payment settlement is 300 seconds.\n\nDocumentation on the provider's site is extremely sparse — all crawled pages (docs, API, pricing, README) only display a \"Connect wallet\" prompt, suggesting the site is a wallet-gated web app with no publicly accessible documentation. As a result, the exact input parameters, response schema, and broader API surface are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice-data","json-response","post-method"],"categories":["payments","finance"],"synonyms":["stripe invoice API","paid invoice endpoint","x402 invoice","crypto-gated API","Base USDC API","lowpaymentfee"],"warnings":["All documentation pages are wallet-gated and display only 'Connect wallet' — no public docs available.","No OpenAPI schema, no input/output schema details beyond the x402 challenge.","The exact nature of the 'Premium API Access' and what invoice data is returned is unclear.","No robots.txt or agents.txt present."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/84","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/84","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, but all documentation pages are wallet-gated and provide no useful information. Input/output schemas, response examples, and the broader API surface are entirely 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'000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '1':97 '20':121 '300':137 '6':128 'Base USDC API' 'accept':50 'access':39,174 'address':79 'amount':118 'api':43,152,187 'app':170 'asset':105 'base':6,21,66,112,123 'broader':186 'call':15,30 'chain':74 'challeng':95 'coin':63 'connect':158 'contract':113 'crawl':149 'crypto-gated API' 'data':10,25,56 'decim':129 'display':156 'doc':151 'document':139,175 'endpoint':4,19,35,86 'exact':82,180 'extrem':146 'gate':3,18,168 'given':127 'header':101 'input':181 'invoic':9,24,48 'json':55 'json-response' 'live':88 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':117,131 'network':67 'on-chain':72 'page':150 'paid invoice endpoint' 'paramet':182 'payment':58,69,83,100,108,134 'per':14,29 'post':51 'post-method' 'premium':42 'price':153 'prompt':160 'protocol':34 'provid':38,103,142 'public':173 'readm':154 'relat':45 'request':52 'requir':119 'resourc':44 'respond':90 'respons':183 'result':178 'return':8,23,54 'schema':184 'scheme':84 'second':138 'settl':71 'settlement':135 'site':144,163 'spars':147 'specifi':77 'standard':93 'stripe':47 'stripe invoice API' 'stripe-invoice-data' 'suggest':161 'surfac':188 'timeout':132 'unit':124 'unknown':190 'upon':57 'usd':62 'usdc':13,28,61,110,126 'usdc-base' 'use':80,106 'version':96 'wallet':78,159,167 'wallet-g':166 'web':169 'x402':2,17,33,94 'x402 invoice' 'x402-gated':1,16 'x402-payment' 'x402-protocol':32","prices":[{"id":"00227a74-0f19-4fbf-a2b5-187dd58d5ebf","listingId":"8e0e6c14-6203-46fa-9e35-692249015d22","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:10.277Z"}],"sources":[{"listingId":"8e0e6c14-6203-46fa-9e35-692249015d22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:10.277Z","lastSeenAt":"2026-04-22T20:01:29.676Z"}],"details":{"listingId":"8e0e6c14-6203-46fa-9e35-692249015d22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/84 \\\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":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/84"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/84"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/84"}],"useCases":["Retrieving Stripe invoice data via a crypto-paid API call","Integrating on-chain micropayments for invoice access","Agent-driven invoice retrieval with automated USDC payment"],"bestFor":["Developers needing programmatic access to specific Stripe invoice data","AI agents that can settle x402 payments on Base","Users comfortable with on-chain USDC micropayments"],"notFor":["Users who need comprehensive API documentation before integrating","Anyone without a Base-compatible wallet or USDC balance","High-volume invoice queries where per-call costs accumulate"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.421Z"},"updatedAt":"2026-04-22T20:01:29.676Z"}}