{"id":"48d2ff8a-2fb5-4770-a8e0-27e62eb34958","shortId":"VScBGW","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 specific Stripe invoice resource (invoice #147) 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.\n\nThe specific endpoint `/api/v1/stripe/invoices/147` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units with USDC's 6 decimals = $0.02). The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nHowever, this particular endpoint's purpose is narrow: it appears to serve a single Stripe invoice resource. There is no OpenAPI schema, no documentation beyond the landing page, and the docs/pricing/API pages all render only a \"Connect wallet\" prompt with no additional content. The actual response payload and input parameters for this endpoint are undocumented, making it difficult to know what data is returned or what POST body is expected.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice-access","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available — input and output formats are unknown","Endpoint targets a single hardcoded resource (invoice 147); unclear if this is a demo or production resource","Documentation pages (/docs, /pricing, /api, /README) contain no useful content beyond 'Connect wallet'","The broader platform advertises many API categories but none are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/147","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the endpoint targets a single hardcoded invoice resource. The docs, pricing, and API pages are all empty beyond a wallet-connect 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'0.02':86,100,126 '000':92 '0x8335':65 '147':42 '20':91 '2913':66 '6':98 'Base network API' 'USDC micropayment API' 'accept':49 'access':34,81 'actual':184 'addit':181 'advertis':105 'ai/ml':117 'analyt':116 'api':80,113,131 'appear':149 'base':8,22,60,93 'base-network' 'behind':43 'beyond':164 'bodi':207 'broader':102 'call':12,26,112 'commit':138 'connect':176 'content':182 'contract':64 'cost':83 'data':115,120,201 'decim':99 'difficult':197 'docs/pricing/api':170 'document':163 'endpoint':6,20,30,48,74,143,192 'exact':70 'expect':209 'finance/web3':119 'gate':3,17 'howev':140 'infer':118 'infrastructur':122 'input':188 'invoic':5,19,39,41,155 'json':54 'key':132 'know':199 'land':166 'limit':135 'list':77 'lowpaymentfee' 'lowpaymentfee.com':32,103 'make':195 'maxamountrequir':89 'narrow':147 'network':61 'no-api-key' 'openapi':160 'page':167,171 'paramet':189 'particular':142 'pay':10,24,110 'pay-per-cal':9,23,109 'pay-per-call API' 'pay-per-request' 'payload':186 'payment':55 'paywal':46 'per':11,25,87,111,127 'platform':104 'post':50,206 'premium':79 'prompt':178 'provid':33 'purpos':145 'rate':134 'render':173 'request':51,88,128 'requir':139 'resourc':40,156 'respons':185 'return':53,203 'schema':161 'scheme':71 'serv':151 'settl':57 'singl':153 'span':114 'specif':37,73 'stripe':4,18,38,154 'stripe invoice API' 'stripe-invoice-access' 'suit':107 'undocu':194 'unit':94 'usdc':14,28,63,96 'usdc-settlement' 'use':62 'util':123 'via':67 'wallet':177 'x402':2,16,45,69 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c6d0ca76-0a85-4bdc-88dc-5f511f11a88c","listingId":"48d2ff8a-2fb5-4770-a8e0-27e62eb34958","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:39.668Z"}],"sources":[{"listingId":"48d2ff8a-2fb5-4770-a8e0-27e62eb34958","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:39.668Z","lastSeenAt":"2026-04-25T13:03:04.195Z"}],"details":{"listingId":"48d2ff8a-2fb5-4770-a8e0-27e62eb34958","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/147 \\\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 version 1 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/147"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/147"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data for invoice #147 via a crypto-paywall","Demonstrating x402 payment protocol integration with USDC on Base","Agent-driven invoice retrieval without traditional API key authentication"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call access to invoice data","Projects already using USDC on Base for micropayments"],"notFor":["Production invoice management requiring bulk or parameterized queries","Users needing detailed API documentation or schema guarantees","Anyone needing access to invoices other than #147"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.867Z"},"updatedAt":"2026-04-25T13:03:04.195Z"}}