{"id":"370b7a72-e535-408f-bb05-b104c6eb4008","shortId":"76SWce","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/129`) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services — all settled on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The price is 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 endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality of this particular endpoint (`/stripe/invoices/129`) is not documented. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data this invoice endpoint returns or what input it expects beyond a POST request. The endpoint appears to be one resource in a larger catalog, but its exact purpose — whether it retrieves a Stripe invoice, creates one, or performs some other action — cannot be determined from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","stripe-invoice","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-call endpoint","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API/README pages return only 'Connect wallet'","No OpenAPI or output schema describing request parameters or response format","The specific purpose of /api/v1/stripe/invoices/129 is unclear — it is not listed among the platform's advertised APIs","Cannot verify what data this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/129","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/129","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 confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of this Stripe invoice endpoint is undocumented. All doc pages returned only 'Connect wallet' with no 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'/request':115 '/stripe/invoices/129':140 '0.02':103,114 '000':93 '0x8335':98 '20':92 '6':108 'Base network API' 'USDC micropayment API' 'accept':86 'across':117 'action':217 'addit':161 'advertis':112 'ai/ml':63 'analyt':62 'api':59,122,148 'appear':192 'avail':222 'base':8,22,73,94,100 'base-network' 'behind':40 'beyond':186 'broader':49 'call':12,26 'cannot':218 'catalog':200 'challeng':79 'commit':130 'confirm':80 'connect':156 'content':162 'crawl':145 'creat':211 'data':61,176 'decim':109 'descript':173 'determin':220 'doc':146 'document':143 'dozen':53 'endpoint':6,20,30,82,119,139,179,191 'equal':102 'exact':203 'exampl':170 'expect':185 'expos':33 'financ':65 'function':135 'gate':3,17 'howev':132 'infer':64 'input':183 'invoic':5,19,37,178,210 'key':123 'larger':199 'limit':126 'live':84 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':223 'minimum':129 'network':74 'offer':52 'one':195,212 'openapi':166 'page':151 'paid':9,23 'part':46 'particular':138 'pay':56 'pay-per-call endpoint' 'pay-per-request':55 'paywal':43 'per':11,25,57,104 'per-cal':10,24 'perform':214 'platform':50,111 'post':87,188 'post-endpoint' 'price':90,116,147 'prompt':158 'purpos':204 'rate':125 'readm':150 'request':58,88,105,189 'request/response':169 'requir':131 'resourc':38,196 'retriev':207 'return':153,180 'schema':167 'servic':68 'settl':70 'span':60 'specif':35,134 'stripe':4,18,36,209 'stripe invoice API' 'stripe-invoice' 'uniform':113 'unit':95 'usdc':14,28,76,97,106 'usdc-settlement' 'use':75,107 'util':67 'wallet':157 'whether':205 'x402':2,16,42,78 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d2a4e508-597e-48fe-a05a-93a262b1af65","listingId":"370b7a72-e535-408f-bb05-b104c6eb4008","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/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:34.286Z"}],"sources":[{"listingId":"370b7a72-e535-408f-bb05-b104c6eb4008","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:34.286Z","lastSeenAt":"2026-04-25T14:32:46.790Z"}],"details":{"listingId":"370b7a72-e535-408f-bb05-b104c6eb4008","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/129 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/129"},{"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/129"}],"useCases":["Retrieving or interacting with a specific Stripe invoice via a crypto-paywall","Programmatic access to invoice data without traditional API key management","Agent-driven payment and data retrieval in a single HTTP round-trip"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users needing Stripe invoice data without maintaining a Stripe account"],"notFor":["Anyone needing well-documented, schema-defined API contracts","Bulk or high-volume invoice processing where per-call fees add up","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.19Z"},"updatedAt":"2026-04-25T14:32:46.790Z"}}