{"id":"c222c996-62f1-44dc-be19-237b38a0c2c7","shortId":"kbqMQB","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/4`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The specific endpoint appears to serve invoice data in JSON format via HTTP POST.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services. All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific endpoint probed here (`/api/v1/stripe/invoices/4`) is labeled \"Premium API Access\" and its x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised pricing.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The endpoint is live and responds with a valid x402 challenge, but the actual behavior and response format of the invoice endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","crypto payment gateway","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet'","No OpenAPI or schema definition found","The specific purpose and response format of /api/v1/stripe/invoices/4 is undocumented","The endpoint path references a hardcoded invoice ID (4), which may indicate a demo or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/4","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/4","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 with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of a 'Stripe invoices/4' endpoint is unclear without further 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'/api/v1/stripe/invoices/4':38,126 '/docs':163 '/pricing':165 '/readme':167 '0.02':106,150 '000':141 '20':140 '402':50 '6':146 'Base network API' 'USDC micropayment API' 'access':131 'actual':206 'advertis':76,156 'ai/ml':88 'analysi':91 'analyt':87 'api':84,111,130 'appear':61 'avail':192 'base':8,22,56,142 'behavior':207 'behind':39 'broader':73 'call':12,26,44 'challeng':51,135,203 'classif':93 'commit':118 'connect':173 'consist':151 'content':179 'crypto payment gateway' 'data':65,86,96 'decim':147 'document':158,188 'embed':94 'endpoint':6,20,30,60,102,123,194,214 'equal':149 'exampl':191 'expos':33 'extrem':160 'feed':97 'finance/crypto':95 'format':68,210 'gate':3,17 'howev':120 'http':70 'infer':89 'invoic':5,19,36,64,213 'json':67 'key':112 'label':128 'limit':115 'list':104 'live':196 'lowpaymentfee' 'lowpaymentfee.com':32,74 'maxamountrequir':138 'network':57 'no-api-key' 'openapi':183 'page':168 'paid':9,23 'pay':81 'pay-per-call API' 'pay-per-request':80 'payment':46 'paywal':42 'per':11,25,82,107 'per-cal':10,24 'platform':75 'post':71 'premium':129 'price':157 'probe':124 'prompt':175 'rate':114 'remain':215 'request':52,83,108 'request/response':186 'requir':119 'resourc':37 'respond':198 'respons':209 'return':48,170 'schema':187 'sentiment':90 'serv':63 'servic':100 'site':154 'span':85 'spars':161 'spec':184 'specif':59,122 'specifi':136 'stripe':4,18,35 'stripe invoice API' 'stripe-invoice' 'substant':178 'suit':78 'summar':92 'undocu':216 'unit':143 'usdc':14,28,53,145 'usdc-base' 'util':99 'valid':201 'via':69 'wallet':174 'without':45 'x402':2,16,41,134,202 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"aa120f1a-c9bf-446f-aa96-93cb492e2abe","listingId":"c222c996-62f1-44dc-be19-237b38a0c2c7","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:06.149Z"}],"sources":[{"listingId":"c222c996-62f1-44dc-be19-237b38a0c2c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:06.149Z","lastSeenAt":"2026-04-25T07:03:30.222Z"}],"details":{"listingId":"c222c996-62f1-44dc-be19-237b38a0c2c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/4\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof 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 (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/4"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across data analytics, AI/ML, finance/crypto, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data via a single paid API call","Programmatic access to invoice records without traditional API key management","Agent-driven invoice lookups settled in USDC on Base"],"bestFor":["Agents or services that need on-demand invoice data without subscription overhead","Developers experimenting with x402 payment-gated APIs","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Bulk invoice retrieval where per-call pricing is inefficient","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.658Z"},"updatedAt":"2026-04-25T07:03:30.222Z"}}