{"id":"3ebb6323-9609-4253-8716-ffd0fcf05335","shortId":"4hXZbq","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 payment challenge. The specific resource `/api/v1/stripe/invoices/61` appears to be a Stripe invoice-related API endpoint, 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 parent site lowpaymentfee.com hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services. Most listed endpoints are priced at $0.02 per request. This particular endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units, which equals $0.02 USDC (20000 / 10^6). The platform emphasizes no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\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, and no explanation of what the Stripe invoices endpoint actually returns or expects as input. The endpoint is confirmed live (402 challenge captured), but without documentation it is difficult to know what data or action it provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","Unclear what 'Premium API Access' or 'Stripe invoices/61' actually returns","The endpoint path references a specific invoice ID (61), which may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/61","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/61","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what this specific Stripe invoices endpoint does. The listing is effectively a 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'/api/v1/stripe/invoices/61':45 '/docs':171 '/pricing':173 '/readme':175 '0.02':120,139 '000':134 '0x8335':77 '10':142 '20':133 '20000':141 '2913':78 '402':216 '6':143 'Base network API' 'USDC micropayment API' 'access':36,155 'action':230 'actual':205 'advertis':129 'ai/ml':101 'analysi':104 'analyt':100 'api':35,54,97,148 'appear':46 'attach':158 'base':8,22,72,135 'base-network' 'behind':37 'beyond':63 'broader':90 'call':12,26,96 'caller':156 'captur':218 'catalog':91 'challeng':41,128,217 'classif':106 'confirm':214 'connect':181 'content':187 'contract':76 'data':99,109,228 'difficult':224 'document':62,166,221 'embed':107 'emphas':146 'endpoint':6,20,30,55,116,125,204,212 'equal':138 'exact':58,82 'expect':208 'explan':198 'extrem':168 'feed':110 'finance/crypto':108 'function':59 'gate':3,17 'generic':65 'header':162 'host':88 'infer':102 'input':210 'instant':154 'invoic':5,19,52,203 'invoice-rel':51 'key':149 'know':226 'label':66 'limit':152 'list':115 'live':215 'lowpaymentfee' 'lowpaymentfee.com':32,87 'maxamountrequir':131 'network':73 'no-api-key' 'openapi':191 'page':176 'paid':9,23 'parent':85 'particular':124 'pay':94 'pay-per-cal':93 'pay-per-call' 'pay-per-request API' 'payment':40,67,161 'per':11,25,95,121 'per-cal':10,24 'platform':145 'premium':34 'price':118 'prompt':183 'provid':33,232 'rate':151 'relat':53 'request':122,165 'request/response':194 'resourc':44 'return':178,206 'schema':195 'scheme':83 'sentiment':103 'servic':113 'settl':69 'simpli':157 'site':86 'span':98 'spars':169 'spec':192 'specif':43 'stripe':4,18,50,202 'stripe invoice API' 'stripe-invoices' 'substant':186 'summar':105 'though':56 'unit':136 'usdc':14,28,75,140 'usdc-settlement' 'use':74 'util':112 'via':79 'wallet':182 'without':220 'x402':2,16,39,81,127,160 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8dd5a7a7-3eee-46eb-9f58-988dbaba1a39","listingId":"3ebb6323-9609-4253-8716-ffd0fcf05335","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:05.534Z"}],"sources":[{"listingId":"3ebb6323-9609-4253-8716-ffd0fcf05335","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:05.534Z","lastSeenAt":"2026-04-25T07:03:30.193Z"}],"details":{"listingId":"3ebb6323-9609-4253-8716-ffd0fcf05335","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/61 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/61"},{"claim":"The site lists APIs at $0.02/request 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/61"}],"useCases":["Programmatically accessing Stripe invoice data via a pay-per-call model","Agent-driven invoice retrieval without pre-provisioned API keys","Integrating invoice lookups into automated financial workflows"],"bestFor":["Agents that need on-demand invoice data without subscription commitments","Developers testing x402 payment flows on Base","Scenarios requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch invoice processing where per-call pricing adds up","Anyone requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.659Z"},"updatedAt":"2026-04-25T07:03:30.193Z"}}