{"id":"46ef30f7-6987-41be-9280-1b3f77aef582","shortId":"VGYCzU","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 132) behind an x402 payment wall. The site advertises itself as a collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/stripe/invoices/132` is listed under the title \"Premium API Access.\" Its x402 challenge confirms it accepts an exact-scheme payment of up to 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint expects HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely thin — 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, and no example payloads available. The actual data returned by this invoice endpoint is unknown; it may return Stripe invoice details or some other structured payload. Prospective callers should be aware of this documentation gap.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","stripe-invoice","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific data returned by /api/v1/stripe/invoices/132 is undocumented","The endpoint name 'Premium API Access' is generic and does not describe its function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/132","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/132","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 spec, no request/response schema, no example payloads, and all documentation pages beyond the landing page are empty wallet-connect stubs. The purpose of this specific invoice endpoint is 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'/api/v1/stripe/invoices/132':111 '/docs':180 '/pricing':182 '/readme':184 '0.02':10,24,73,145 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':140 '132':42 '20':134 '300':160 '6':149 'Base network API' 'USDC micropayment API' 'accept':125 'access':34,119 'actual':212 'address':156 'advertis':50 'ai/ml':64 'analyt':63 'api':60,85,118 'application/json':170 'attach':96 'avail':210 'awar':236 'base':8,22,82,136,142 'behind':43 'beyond':172 'call':59 'caller':94,233 'challeng':122 'collect':54 'commit':91 'confirm':123 'connect':190 'data':62,213 'decim':150 'detail':197,226 'direct':154 'document':171,239 'endpoint':6,20,30,110,164,218 'equal':144 'exact':128 'exact-schem':127 'exampl':208 'expect':165 'extrem':177 'finance/web3':66 'gap':240 'gate':3,17 'given':146 'header':101 'http':166 'id':41 'infer':65 'infrastructur':68 'invoic':5,19,38,40,217,225 'json-response' 'key':86 'land':174 'limit':88 'list':113 'lowpaymentfee' 'lowpaymentfee.com':32 'may':222 'network':83 'no-api-key' 'openapi':201 'page':175,185 'pay':9,23,57 'pay-per-cal':56 'pay-per-call API' 'pay-per-request' 'payload':209,231 'payment':46,100,106,130,152 'per':13,27,58,74 'post':167 'premium':117 'price':71 'prompt':192 'proof':107 'prospect':232 'provid':33 'rate':87 'render':187 'request':14,28,75 'request/response':204 'requir':93 'resourc':39 'return':169,214,223 'schema':205 'scheme':129 'second':161 'settl':77 'simpli':95 'site':49 'span':61 'spec':202 'specif':109 'stripe':4,18,37,224 'stripe invoice API' 'stripe-invoice' 'structur':230 'technic':196 'thin':178 'timeout':162 'titl':116 'unit':137 'unknown':220 'upfront':90 'usdc':12,26,79,139,147 'usdc-base' 'util':69 'valid':104 'wall':47 'wallet':191 'x':99 'x-payment':98 'x402':2,16,45,105,121 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"28a4a308-1d59-4b50-ad98-9c69601d9555","listingId":"46ef30f7-6987-41be-9280-1b3f77aef582","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/132","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":"46ef30f7-6987-41be-9280-1b3f77aef582","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:34.286Z","lastSeenAt":"2026-04-25T14:32:46.813Z"}],"details":{"listingId":"46ef30f7-6987-41be-9280-1b3f77aef582","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/132 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 site lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/132"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data programmatically via a single micropayment","Demonstrating x402 payment protocol integration with USDC on Base","Agent-driven invoice lookup without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need one-shot invoice data without account setup","Low-volume callers who prefer pay-per-request over subscriptions"],"notFor":["High-volume invoice processing where per-call fees add up","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.165Z"},"updatedAt":"2026-04-25T14:32:46.813Z"}}