{"id":"5e810bdd-6449-4aa6-870b-cfa8ed73513a","shortId":"YjeJuc","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 access to a Stripe invoice resource (invoice ID 45) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and utility services (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing is for the Stripe invoices endpoint at path /api/v1/stripe/invoices/45, which is not among the endpoints documented on the landing page.\n\nBecause the endpoint is not described in the site's public documentation and the crawled docs/pricing/API pages returned only a \"Connect wallet\" prompt with no further content, the actual behavior and response schema of this particular endpoint remain unclear. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live and accepting payment-gated requests.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","stripe-invoice","pay-per-request","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["This specific endpoint path (/api/v1/stripe/invoices/45) is not listed among the documented APIs on the provider's landing page.","Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","No response schema or example responses are available; actual endpoint behavior is unknown.","The endpoint name 'Premium API Access' is generic and does not describe the resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but this specific endpoint (/api/v1/stripe/invoices/45) is not documented anywhere on the site. Crawled pages beyond the landing page returned only 'Connect wallet' with no usable content. No OpenAPI spec, no response schema, and no description of what the endpoint actually 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'0.02':90,133 '000':80 '0x8335':65 '20':79 '2913':66 '402':217 '45':42 '6':87 'Base network API' 'USDC micropayment API' 'accept':49,224 'access':34 'actual':199 'advertis':97 'ai/ml':109 'among':163 'amount':74 'analysi':112 'analyt':108 'api':105,138 'base':8,22,60,81 'base-network' 'behavior':200 'behind':43 'broader':94 'call':12,26,77 'captur':215 'challeng':212 'classif':114 'commit':146 'confirm':218 'connect':191 'content':197 'contract':64 'convers':126 'crawl':185 'crypto':118 'crypto payment endpoint' 'data':107,120 'decim':88 'describ':176 'docs/pricing/api':186 'document':166,182 'embed':115 'endpoint':6,20,30,48,129,156,165,173,207,220 'equal':89 'exact':70 'financ':116 'gate':3,17,227 'generat':127 'geocod':124 'howev':147 'http':216 'id':41 'infer':110 'invoic':5,19,38,40,155 'json':54 'json-response' 'key':139 'land':169 'limit':142 'list':131,150 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,95 'market':119 'maximum':73 'minimum':145 'network':61 'page':170,187 'particular':206 'path':158 'pay':10,24,102 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':101 'payment':55,226 'payment-g':225 'paywal':46 'per':11,25,76,91,103,134 'platform':96 'post':50 'post-method' 'prompt':193 'provid':33 'public':181 'rate':141 'remain':208 'request':51,92,104,135,228 'requir':75 'resourc':39 'respons':202 'return':53,188 'schema':203 'scheme':71 'sentiment':111 'servic':123 'settl':57 'site':179 'span':106 'specif':149 'stripe':4,18,37,154 'stripe invoice API' 'stripe-invoice' 'success':214 'suit':99 'summar':113 'unclear':209 'unit':82 'usdc':14,28,63,84 'usdc-payment' 'use':62 'util':122 'valid':125 'via':67 'wallet':192 'x402':2,16,45,69,211 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"15402775-0a0e-4607-ba85-c2a25946b6e9","listingId":"5e810bdd-6449-4aa6-870b-cfa8ed73513a","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:04.935Z"}],"sources":[{"listingId":"5e810bdd-6449-4aa6-870b-cfa8ed73513a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:04.935Z","lastSeenAt":"2026-04-25T07:03:30.165Z"}],"details":{"listingId":"5e810bdd-6449-4aa6-870b-cfa8ed73513a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/45\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid 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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/45"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/45"},{"claim":"All listed 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 site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data via a crypto-settled micropayment","Programmatic access to invoice #45 without traditional API keys","Agent-driven invoice lookup with on-chain USDC payment 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 exploring x402 protocol integrations with Stripe billing"],"notFor":["Users needing bulk invoice management or batch operations","Anyone requiring detailed API documentation or response schemas before integrating","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.749Z"},"updatedAt":"2026-04-25T07:03:30.165Z"}}