{"id":"4fed1662-e462-4bd9-8707-4257e82c231b","shortId":"RjwaXj","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 Stripe invoice resource (`/api/v1/stripe/invoices/78`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The specific resource appears to be a single Stripe invoice lookup, though the site does not provide detailed documentation for this particular path.\n\nThe parent site lowpaymentfee.com hosts a broader catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request, payable in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe probed endpoint charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts HTTP POST and returns `application/json`. Documentation beyond the landing page is essentially empty — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","pay-per-call API","USDC payment API","x402 endpoint","Base network API","micropayment API","invoice lookup"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are all empty","No request body schema or response schema documented for this endpoint","The path '/api/v1/stripe/invoices/78' references a hardcoded invoice ID (78); unclear if this is a demo or production resource","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/78","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/78","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific purpose of the /stripe/invoices/78 path is unclear — it could be a demo or a real invoice proxy. Very little can be verified beyond the 402 challenge 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'/api/v1/stripe/invoices/78':38 '/docs':193 '/pricing':194 '/readme':197 '0.02':127,163 '000':154 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':170 '20':153 '402':50 '6':159 'Base network API' 'USDC payment API' 'accept':178 'ai/ml':98 'analysi':101 'analyt':97 'api':94,137 'appear':61 'application/json':183 'base':8,22,56,134,155 'behind':39 'beyond':185 'broader':87 'call':12,26,44,165 'catalog':88 'challeng':51 'charg':149 'classif':103 'commit':144 'connect':203 'content':209 'convers':120 'data':96 'decim':160 'detail':75 'document':76,184 'embed':104 'empti':191 'endpoint':6,20,30,123,148,177 'equal':162 'essenti':190 'estim':114 'exact':173 'exchang':109 'expos':33 'feed':108 'financ':105 'gas':113 'gate':3,17 'generat':121 'geocod':118 'host':85 'http':179 'infer':99 'infrastructur':116 'invoic':5,19,36,67 'invoice lookup' 'json-response' 'key':138 'land':187 'limit':141 'list':125 'lookup':68 'lowpaymentfee.com':32,84 'maximum':151 'micropayment API' 'network':57 'no-api-key' 'page':188,198 'paid':9,23 'parent':82 'particular':79 'path':80 'pay':91 'pay-per-call API' 'pay-per-request':90 'payabl':130 'payment':46,166,174 'paywal':42 'per':11,25,92,128,164 'per-cal':10,24 'post':180 'price':107 'probe':147 'prompt':205 'provid':74 'quot':112 'rate':110,140 'render':200 'request':52,93,129 'requir':145 'resourc':37,60 'return':48,182 'scheme':175 'sent':168 'sentiment':100 'singl':65 'site':71,83 'span':95 'specif':59 'stripe':4,18,35,66 'stripe invoice API' 'stripe-invoice' 'substant':208 'summar':102 'though':69 'token':111 'unit':156 'usdc':14,28,53,132,158 'usdc-base' 'use':171 'util':117 'valid':119 'wallet':204 'web3':106 'without':45 'x402':2,16,41 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f1f8f300-240c-4964-965a-3ba227327098","listingId":"4fed1662-e462-4bd9-8707-4257e82c231b","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:18.021Z"}],"sources":[{"listingId":"4fed1662-e462-4bd9-8707-4257e82c231b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:18.021Z","lastSeenAt":"2026-04-25T04:32:53.704Z"}],"details":{"listingId":"4fed1662-e462-4bd9-8707-4257e82c231b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/78\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to proceed.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/78"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a single paid API call","Programmatic invoice access without traditional API key management","Agent-driven invoice retrieval with on-chain USDC micropayment"],"bestFor":["Developers wanting keyless, pay-per-use access to invoice data","AI agents that can settle x402 payments in USDC on Base","Prototyping x402 payment flows against a live endpoint"],"notFor":["Bulk invoice processing requiring thousands of calls (no volume discounts documented)","Users who need detailed API documentation or SDKs before integrating","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.081Z"},"updatedAt":"2026-04-25T04:32:53.704Z"}}