{"id":"9495a18b-9abc-4db0-98ce-96067f13cf1a","shortId":"jUvukX","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides x402-protocol access to a Stripe invoice resource (invoice #136). It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind x402 payment challenges on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/136` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no explanation of what data the invoice endpoint actually returns. The platform lists many other endpoints (analytics, AI, finance, utils) at the same $0.02 price point, but none have documented schemas or example payloads available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available — actual response format is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint targets a specific invoice ID (136); it is unclear whether this is a demo or a real resource","No description of what 'Premium API Access' actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/136","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/136","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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of 'Premium API Access' for a specific Stripe invoice ID is unclear. This is effectively a stub 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'0.02':10,24,111,215 '000':101 '0x8335':106 '136':44 '20':100 '300':133 '6':116 'Base network API' 'USDC micropayment API' 'accept':89 'access':37,87,144 'across':58 'actual':200 'address':130 'advertis':143 'ai':209 'ai/ml':61 'analyt':60,208 'api':57,86,137,162 'avail':226 'base':8,22,75,102,108 'behind':69 'beyond':186 'broader':50 'call':56 'chain':151 'challeng':72,94 'connect':171 'content':177 'cost':98 'crawl':229 'data':59,196 'decim':117 'doc':161 'document':153,221 'endpoint':6,20,30,81,199,207 'equal':110 'exact':124 'exampl':224 'explan':193 'extrem':158 'financ':210 'finance/web3':63 'gate':3,17,68 'grant':146 'indic':95 'infer':62 'infrastructur':65 'invoic':5,19,41,43,198 'key':138 'label':84 'limit':141 'list':204 'lowpaymentfee' 'lowpaymentfee.com':32 'made':120 'mani':205 'maximum':97 'micropay':152 'micropayment' 'network':76 'no-api-key' 'none':219 'offer':52 'on-chain':149 'openapi':181 'outputschema':189 'page':166 'part':47 'pay':9,23,54 'pay-per-cal':53 'pay-per-call invoice' 'pay-per-request' 'payload':225 'payment':71,118 'payto':129 'per':11,25,55,112 'platform':51,203 'point':217 'post':90 'premium':85 'price':163,216 'prompt':173 'protocol':36 'provid':33 'pure':147 'rate':140 'readm':165 'render':168 'request':12,26,91,113 'request/response':184 'resourc':42 'return':201 'schema':185,222 'scheme':125 'second':134 'site':156 'spec':182 'specif':80 'specifi':128 'stripe':4,18,40 'stripe invoice API' 'stripe-invoice' 'stub':190 'substant':176 'thin':159 'timeout':135 'unit':103 'usdc':14,28,78,105,114 'usdc-base' 'use':77,115 'util':66,211 'via':121 'wallet':172 'x402':2,16,35,70,93,123,188 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"8b5bf3aa-23dc-4bc1-abde-16bb92f760d4","listingId":"9495a18b-9abc-4db0-98ce-96067f13cf1a","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:41.466Z"}],"sources":[{"listingId":"9495a18b-9abc-4db0-98ce-96067f13cf1a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:41.466Z","lastSeenAt":"2026-04-25T13:03:04.274Z"}],"details":{"listingId":"9495a18b-9abc-4db0-98ce-96067f13cf1a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/136 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/136"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/136"}],"useCases":["Retrieving Stripe invoice data via a single micropayment without needing an API key","Agent-driven invoice lookup where payment is settled on-chain per request","Programmatic access to invoice #136 details for automated accounting workflows"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents that can settle x402 payments on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Bulk invoice retrieval or batch processing (no documented batch endpoints)","Users who need detailed API documentation or response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.805Z"},"updatedAt":"2026-04-25T13:03:04.274Z"}}