{"id":"510d55c9-03f1-4661-9c25-a47abc02264c","shortId":"tmySLa","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 provides \"Premium API Access\" behind an x402 payment challenge. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/81` appears to be a Stripe invoice-related resource. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is made inline via the x402 `X-PAYMENT` header using the \"exact\" scheme.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a well-formed 402 challenge), but the actual functionality behind the paywall is unclear beyond the \"Premium API Access\" label and the Stripe invoices path.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","stripe-invoices","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment","Base network API","Stripe invoice API","lowpaymentfee","crypto-gated endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Actual functionality of the /api/v1/stripe/invoices/81 endpoint is unknown beyond its path name","No request or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind the paywall is undocumented, making this effectively a stub 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'/request':128 '0.02':116,127 '000':106 '0x8335':111 '20':105 '402':215 '6':121 'Base network API' 'Stripe invoice API' 'USDC micropayment' 'access':36,230 'across':130 'actual':219 'advertis':125 'ai/ml':62 'analyt':61 'api':35,58,136,170,229 'appear':88 'avail':200 'base':8,22,78,107,113 'base-network' 'behind':37,221 'beyond':226 'broader':47 'call':12,26 'challeng':41,99,216 'commit':144 'confirm':208 'connect':179 'cost':103 'crawl':203 'crypto-gated endpoint' 'data':60,66 'decim':122 'detail':186 'doc':169 'document':161,195 'endpoint':6,20,30,86,133,206 'equal':115 'exact':159 'exampl':199 'extrem':166 'financ':64 'form':214 'function':220 'gate':3,17,71 'header':156 'indic':100 'infer':63 'infrastructur':68 'inlin':149 'invoic':5,19,94,235 'invoice-rel':93 'key':137 'label':231 'limit':140 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32 'made':148 'materi':204 'maximum':102 'minimum':143 'network':79 'offer':50 'openapi':190 'page':174 'paid':9,23 'part':44 'path':236 'pay':55 'pay-per-call API' 'pay-per-request':54 'payment':40,146,155 'paywal':223 'per':11,25,56,117 'per-cal':10,24 'per-request-pricing' 'platform':48,124 'post-method' 'premium':34,228 'price':129,171 'prompt':181 'protocol':75 'provid':33 'rate':139 'readm':173 'relat':95 'render':176 'request':57,118 'request/response':193 'requir':145 'resourc':96 'return':210 'schema':194 'scheme':160 'settl':81 'site':164 'span':59 'spars':167 'spec':191 'specif':85 'stripe':4,18,92,234 'stripe-invoices' 'technic':185 'unclear':225 'uniform':126 'unit':108 'usag':198 'usdc':14,28,83,110,119 'usdc-settlement' 'use':120,157 'util':69 'varieti':52 'via':72,150 'wallet':180 'web3':65 'well':213 'well-form':212 'x':154 'x-payment':153 'x402':2,16,39,74,98,152 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f6322745-ab65-4bfe-ab9f-2e0586561dd7","listingId":"510d55c9-03f1-4661-9c25-a47abc02264c","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:20.469Z"}],"sources":[{"listingId":"510d55c9-03f1-4661-9c25-a47abc02264c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:20.469Z","lastSeenAt":"2026-04-25T04:03:27.181Z"}],"details":{"listingId":"510d55c9-03f1-4661-9c25-a47abc02264c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/81 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/81"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/81"}],"useCases":["Programmatically accessing Stripe invoice data via a crypto-settled pay-per-call model","Agent-driven workflows that need to fetch or create invoice records without traditional API keys","Integrating USDC micropayments into invoice retrieval pipelines"],"bestFor":["Developers who want keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users who prefer crypto micropayments over subscription-based API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.968Z"},"updatedAt":"2026-04-25T04:03:27.181Z"}}