{"id":"66c25da9-3df6-468a-b775-81b9aaf85786","shortId":"S3nBgM","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/172`) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services—all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (`/api/v1/stripe/invoices/172`) appears to be a Stripe invoice retrieval or interaction endpoint, which is distinct from the general catalog categories. The exact request body schema and response format are not documented in the crawled material.\n\nThe endpoint is live: it returns a well-formed x402 version 1 challenge with a 402 status code. Documentation pages (/docs, /pricing, /api, /README) all resolve but contain only a \"Connect wallet\" prompt with no substantive content, so the actual request/response contract for this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","stripe-invoice-access","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","pay-per-request API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No request or response schema documented; input/output format is unknown.","All documentation pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content.","The endpoint path references a specific Stripe invoice ID (172), which may be a demo or placeholder resource.","The relationship between this Stripe invoice endpoint and the advertised API catalog categories is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/172","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation of request/response schemas, no OpenAPI spec, and all doc pages are empty stubs. The specific purpose of this Stripe invoice endpoint is unclear beyond its URL 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'/api/v1/stripe/invoices/172':39,130 '/docs':185 '/pricing':186 '/readme':188 '0.02':68,110 '000':72 '0x8335':61 '1':176 '20':71 '2913':62 '402':180 '6':76 'Base network API' 'USDC micropayment API' 'accept':45 'actual':204 'advertis':82 'ai/ml':94 'analysi':97 'analyt':93 'api':90,115 'appear':131 'base':8,22,56,73 'behind':40 'bodi':152 'broader':79 'call':12,26,89 'catalog':147 'categori':148 'challeng':177 'classif':99 'code':182 'commit':122 'connect':195 'contain':192 'content':201 'contract':60,206 'cost':66 'crawl':162 'data':92,103 'decim':77 'distinct':143 'document':159,183 'embed':100 'endpoint':6,20,30,126,140,165,209 'exact':150 'expos':33 'finance/crypto':101 'form':173 'format':156 'gate':3,17 'general':146 'howev':123 'infer':95 'interact':139 'invoic':5,19,37,136 'json':50 'key':116 'limit':119 'list':128 'live':167 'lowpaymentfee' 'lowpaymentfee.com':32,80 'market':102 'materi':163 'maximum':65 'network':57 'no-api-key' 'page':184 'paid':9,23 'pay':87 'pay-per-cal':86 'pay-per-call' 'pay-per-request API' 'payment':51 'paywal':43 'per':11,25,69,88,111 'per-cal':10,24 'platform':81 'post':46 'price':108 'prompt':197 'rate':118 'remain':210 'request':47,70,112,151 'request/response':205 'resolv':190 'resourc':38 'respons':155 'retriev':137 'return':49,169 'schema':153 'sentiment':96 'servic':106 'settl':53 'span':91 'specif':35,125 'status':181 'stripe':4,18,36,135 'stripe invoice API' 'stripe-invoice-access' 'substant':200 'suit':84 'summar':98 'unit':74 'unknown':211 'usdc':14,28,59 'usdc-base-network' 'use':58 'util':105 'version':175 'wallet':196 'well':172 'well-form':171 'x402':2,16,42,174 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2b026a75-5243-4dce-9476-ff50f0c3d050","listingId":"66c25da9-3df6-468a-b775-81b9aaf85786","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:54.076Z"}],"sources":[{"listingId":"66c25da9-3df6-468a-b775-81b9aaf85786","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:54.076Z","lastSeenAt":"2026-04-25T10:03:27.547Z"}],"details":{"listingId":"66c25da9-3df6-468a-b775-81b9aaf85786","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/172 \\\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 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/172"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/172"}],"useCases":["Retrieving or interacting with a specific Stripe invoice programmatically","Demonstrating x402 payment-gated API access on Base","Integrating pay-per-call invoice data into agent workflows"],"bestFor":["Agents or services that need on-demand Stripe invoice data without API key management","Developers experimenting with x402 payment protocol on Base","Micropayment-gated access to financial documents"],"notFor":["Bulk invoice processing requiring thousands of calls (no documented rate limits but cost adds up)","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.23Z"},"updatedAt":"2026-04-25T10:03:27.547Z"}}