{"id":"b5adfb3e-a02b-4a2b-a2ac-7bfa73ce2025","shortId":"4Najtp","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/62`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The challenge specifies a maximum amount of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals), consistent with the site-wide $0.02/request pricing advertised on the landing page.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories — data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here is under the `/stripe/invoices/` path, which is not explicitly documented on the landing page among the advertised API categories. Its exact response payload is unknown; the x402 challenge describes the output MIME type as `application/json` and the input method as HTTP POST.\n\nDocumentation beyond the landing page is essentially empty — 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 examples, and no detailed description of what the invoice endpoint returns. Treat this as a minimally documented endpoint whose actual utility should be verified before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","per-call-pricing","no-api-key","json-response"],"categories":["finance","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment","Stripe invoice API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI spec or detailed documentation available","The /stripe/invoices/ path is not listed among the site's publicly advertised API endpoints","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content","Exact request parameters and response schema are unknown","The endpoint path references a specific invoice ID (62); unclear if other IDs are accessible or what the resource represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/62","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific /stripe/invoices/62 path is not listed among the site's advertised APIs. Effectively a stub 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'/api/v1/stripe/invoices/62':38 '/docs':182 '/pricing':184 '/readme':186 '/request':85 '/stripe/invoices':134 '0.02':71,84,111 '000':66 '20':65 '402':50 '6':76 'Base network API' 'Stripe invoice API' 'USDC micropayment' 'actual':225 'advertis':87,96,147 'ai/ml':102 'among':145 'amount':63 'analyt':101 'api':98,116,148 'application/json':165 'base':8,22,56,67 'behind':39 'beyond':174 'broader':93 'call':12,26,44 'categori':99,149 'challeng':51,59,158 'commit':123 'connect':192 'consist':78 'content':198 'data':100 'decim':77 'describ':159 'descript':210 'detail':209 'document':140,173,222 'empti':180 'endpoint':6,20,30,127,215,223 'essenti':179 'exact':151 'exampl':206 'explicit':139 'expos':33 'finance/web3':104 'gate':3,17 'howev':124 'http':171 'infer':103 'infrastructur':106 'input':168 'invoic':5,19,36,214 'json-response' 'key':117 'land':90,143,176 'limit':120 'list':129 'lowpaymentfee' 'lowpaymentfee.com':32,94 'maximum':62 'method':169 'mime':162 'minim':221 'multipl':97 'network':57 'no-api-key' 'openapi':202 'output':161 'page':91,144,177,187 'paid':9,23 'path':135 'pay-per-call API' 'payload':153 'payment':46 'paywal':42 'per':11,25,112 'per-cal':10,24 'per-call-pricing' 'platform':95 'post':172 'price':86,109 'product':235 'prompt':194 'rate':119 'reli':231 'render':189 'request':52,113 'request/response':205 'resourc':37 'respons':152 'return':48,216 'sinc':73 'site':82 'site-wid':81 'spec':203 'specif':126 'specifi':60 'stripe':4,18,35 'stripe-invoice' 'substant':197 'treat':217 'type':163 'unit':68 'unknown':155 'usd':72 'usdc':14,28,53,70,74 'usdc-base' 'use':75 'util':107,226 'verifi':229 'wallet':193 'whose':224 'wide':83 'without':45 'x402':2,16,41,157 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6734d70d-f470-4f2d-ab0f-b2e7d757e653","listingId":"b5adfb3e-a02b-4a2b-a2ac-7bfa73ce2025","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:01.298Z"}],"sources":[{"listingId":"b5adfb3e-a02b-4a2b-a2ac-7bfa73ce2025","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:01.298Z","lastSeenAt":"2026-04-22T19:32:02.482Z"}],"details":{"listingId":"b5adfb3e-a02b-4a2b-a2ac-7bfa73ce2025","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/62\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests a maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/62"},{"claim":"Site-wide pricing is advertised as $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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/62"}],"useCases":["Retrieving a Stripe invoice record via a single USDC micropayment","Agent-driven invoice lookup without traditional API key authentication","Programmatic access to invoice data settled on Base L2"],"bestFor":["Agents that can settle x402 USDC payments on Base","Low-volume, pay-as-you-go invoice data retrieval","Developers exploring x402 protocol integrations"],"notFor":["High-volume invoice processing requiring bulk pricing or SLAs","Users who need detailed API documentation or guaranteed schema stability","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.887Z"},"updatedAt":"2026-04-22T19:32:02.482Z"}}