{"id":"7a3a062d-1732-41a6-91f7-84d9121ad37b","shortId":"2pYLmZ","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/38`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (0.02 USD), consistent with the site-wide $0.02/request pricing advertised by the provider.\n\nThe provider, lowpaymentfee.com, offers a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services. All endpoints share the same $0.02 USDC pricing and x402 payment scheme on Base. This specific endpoint appears to be a Stripe invoice resource, though the exact response payload is undocumented — no OpenAPI spec, examples, or detailed docs were found during crawling (most pages only rendered a \"Connect wallet\" prompt).\n\nThe endpoint is live and responds with a well-formed x402 v1 challenge. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base to address 0x1A2B…85F3. The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised. Documentation is extremely sparse, so the actual request format and response schema remain unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","stripe-invoice","pay-per-call","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice api","x402 stripe","pay-per-call invoice","usdc api payment","lowpaymentfee","base network api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response payload structure is completely undocumented","Most documentation pages render only a 'Connect wallet' prompt with no useful content","The specific purpose of /api/v1/stripe/invoices/38 is unclear — it may be a demo or placeholder","No information on what POST body (if any) is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation of request/response schemas, and no examples. Most crawled pages only show a 'Connect wallet' prompt. The purpose of this specific Stripe invoice endpoint is unclear beyond its 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'/request':80 '0.02':71,79,120 '000':66 '0x1a2b':194 '0x8335':188 '20':65 '2913':189 '300':203 '402':50 '402 payment api' '85f3':195 'actual':220 'address':193 'advertis':82,213 'ai/ml':102 'amount':60 'analysi':105 'analyt':101 'api':98,207 'appear':132 'base':8,22,56,67,128,191 'base network api' 'behind':39 'broader':91 'call':12,26,44,63,97 'catalog':92 'chain':184 'challeng':51,178 'classif':107 'connect':162 'consist':73 'contract':187 'crawl':156 'data':100,111 'detail':151 'doc':152 'document':214 'embed':108 'endpoint':6,20,30,116,131,166 'exact':141,200 'exampl':149 'expos':33 'extrem':216 'finance/crypto':109 'form':175 'format':222 'found':154 'gate':3,17 'infer':103 'invoic':5,19,36,137 'key':208 'limit':211 'live':168 'lowpaymentfee' 'lowpaymentfee.com':32,88 'market':110 'maximum':59 'network':57 'no-api-key' 'no-rate-limit' 'offer':89 'on-chain':182 'openapi':147 'page':158 'pay':10,24,95 'pay-per-cal':9,23,94 'pay-per-call' 'pay-per-call invoice' 'payload':143 'payment':46,125,179,197 'paywal':42 'per':11,25,62,96 'price':81,122 'prompt':164 'provid':85,87 'rate':210 'remain':226 'render':160 'request':52,221 'requir':61 'resourc':37,138 'respond':170 'respons':142,224 'return':48 'schema':225 'scheme':126,198 'second':204 'sentiment':104 'servic':114 'settl':181 'share':117 'site':77 'site-wid':76 'span':99 'spars':217 'spec':148 'specif':130 'stripe':4,18,35,136 'stripe invoice api' 'stripe-invoice' 'summar':106 'though':139 'timeout':205 'undocu':145 'unit':68 'unknown':227 'usd':72 'usdc':14,28,53,70,121,186 'usdc api payment' 'usdc-on-base' 'util':113 'v1':177 'via':185 'wallet':163 'well':174 'well-form':173 'wide':78 'without':45 'x402':2,16,41,124,176 'x402 stripe' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"689120f6-0fe6-4773-8257-391a9a576422","listingId":"7a3a062d-1732-41a6-91f7-84d9121ad37b","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:03.122Z"}],"sources":[{"listingId":"7a3a062d-1732-41a6-91f7-84d9121ad37b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:03.122Z","lastSeenAt":"2026-04-25T07:03:30.107Z"}],"details":{"listingId":"7a3a062d-1732-41a6-91f7-84d9121ad37b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/38\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","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/38"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/38"}],"useCases":["Retrieving or interacting with a Stripe invoice programmatically via a crypto-paywall","Agent-driven invoice access without traditional API key provisioning","Demonstrating x402 payment protocol integration with Stripe billing data"],"bestFor":["Developers exploring x402 protocol integrations","Agents that need keyless, pay-per-call access to invoice data","Projects already using USDC on Base for micro-payments"],"notFor":["Production invoice management requiring documented, stable APIs","Users who need detailed response schema guarantees before integration","High-volume batch invoice processing (each call costs $0.02 on-chain)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.771Z"},"updatedAt":"2026-04-25T07:03:30.107Z"}}