{"id":"de327c0a-a230-4629-980f-6ac165e1d5c3","shortId":"sNGMNN","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 paywall. The specific resource `/api/v1/stripe/invoices/75` appears to be a Stripe invoice-related API call, though the exact functionality is not documented beyond the generic label. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most listed endpoints cost $0.02 per request. This particular endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's uniform pricing.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response contains. The endpoint accepts POST requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","per-call-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","Exact functionality of /api/v1/stripe/invoices/75 is undocumented","The endpoint path references a specific invoice ID (75); unclear if this is parameterized or fixed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/75","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on request format, response schema, or what 'Premium API Access' for Stripe invoices actually returns. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect 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'0.02':123,146 '000':137 '0x8335':76 '20':136 '2913':77 '402':195 '6':142 'Base network API' 'USDC micropayment API' 'accept':215 'access':36 'advertis':132 'ai/ml':98 'api':35,53,95,160 'appear':45 'base':8,22,71,138 'base-network' 'behind':37 'beyond':62 'bodi':205 'broad':89 'call':12,26,54 'catalog':90 'challeng':131,196 'classif':101 'connect':169 'consist':147 'contain':212 'content':175 'contract':75 'convers':117 'cost':122 'data/analytics':97 'decim':143 'doc':159 'document':61,154,199 'embed':102 'endpoint':6,20,30,121,128,189,214 'equal':145 'estim':111 'exact':57,81 'exampl':187 'exchang':106 'expect':207 'extrem':156 'feed':105 'finance/web3':103 'function':58 'gas':110 'gate':3,17,94 'generat':118 'generic':64 'geocod':115 'host':84 'infrastructur':113 'invoic':5,19,51 'invoice-rel':50 'label':65 'list':120 'live':191 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maxamountrequir':134 'network':72 'no-api-key' 'offer':87 'openapi':179 'page':164 'paid':9,23 'particular':127 'pay-per-call API' 'payment':66 'paywal':40 'per':11,25,124 'per-cal':10,24 'per-call-pricing' 'post':216 'premium':34 'price':104,153,161 'prompt':171 'proper':194 'provid':33 'quot':109 'rate':107 'readm':163 'relat':52 'render':166 'request':125,204,217 'request/response':182 'resourc':43 'respons':211 'return':192 'schema':183 'scheme':82 'sentiment':99 'settl':68 'site':85,150 'span':96 'spars':157 'spec':180 'specif':42 'stripe':4,18,49 'stripe invoice API' 'stripe-invoices' 'substant':174 'summar':100 'though':55 'token':108 'unclear':202 'uniform':152 'unit':139 'usag':186 'usdc':14,28,74,141 'usdc-settlement' 'use':73 'util':114 'valid':116 'via':78 'wallet':170 'without':198 'x402':2,16,39,80,93,130 'x402 paid API' 'x402-gated':1,15,92 'x402-payment'","prices":[{"id":"5a8dc667-b602-48dd-93f6-308c7c0d44fc","listingId":"de327c0a-a230-4629-980f-6ac165e1d5c3","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:07.950Z"}],"sources":[{"listingId":"de327c0a-a230-4629-980f-6ac165e1d5c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:07.950Z","lastSeenAt":"2026-04-25T07:03:30.358Z"}],"details":{"listingId":"de327c0a-a230-4629-980f-6ac165e1d5c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/75 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/75"},{"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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/75"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically accessing Stripe invoice data via a pay-per-call model","Agent-driven invoice retrieval without API key management","Micropayment-gated access to financial data"],"bestFor":["Agents that need one-off invoice lookups without subscription commitments","Developers exploring x402 payment protocol integrations","Use cases where no-API-key, pay-per-request access is preferred"],"notFor":["Production workloads requiring documented request/response schemas","High-volume invoice processing where subscription pricing would be cheaper","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.542Z"},"updatedAt":"2026-04-25T07:03:30.358Z"}}