{"id":"6215614a-6964-42cc-9b89-2ad3c0868ff6","shortId":"A2hadj","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 provides \"Premium API Access\" behind an x402 payment challenge. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/invoices/68` appears to be a Stripe invoice-related resource. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, no minimums, and instant access.\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 schema, no request/response examples, and no description of what this particular invoice endpoint actually returns or what input it expects. The endpoint accepts POST requests and returns application/json according to the x402 challenge metadata. Without further documentation it is unclear what payload to send or what the response contains.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","stripe-invoices","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; it is unknown what POST body to send or what the response contains.","The specific purpose of /api/v1/stripe/invoices/68 is not explained anywhere in the crawled material.","The platform lists many endpoints but none have documented schemas or usage examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of this specific invoice endpoint is unclear, making this effectively a stub 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'/request':126 '0.02':114,125 '000':104 '0x8335':109 '20':103 '6':119 'Base network API' 'USDC micropayment API' 'accept':191 'access':36,142 'accord':197 'across':128 'actual':182 'advertis':123 'ai':62 'analyt':61 'api':35,58,133,149 'appear':86 'application/json':196 'base':8,22,78,105,111 'base-network' 'behind':37 'broader':47 'call':12,26 'challeng':41,97,201 'connect':158 'contain':217 'content':164 'cost':101 'data':60 'decim':120 'descript':175 'doc':148 'document':143,205 'endpoint':6,20,30,84,130,181,190 'equal':113 'exampl':172 'expect':188 'extrem':145 'financ':65 'gate':3,17,71 'indic':98 'infrastructur':68 'input':186 'instant':141 'invoic':5,19,92,180 'invoice-rel':91 'key':134 'learn':64 'limit':137 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':63 'maximum':100 'metadata':202 'minimum':139 'network':79 'no-api-key' 'offer':50 'openapi':168 'page':153 'part':44 'particular':179 'pay':10,24,55 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':54 'payload':210 'payment':40 'per':11,25,56,115 'platform':48,122 'post':192 'premium':34 'price':127,150 'prompt':160 'protocol':75 'provid':33 'rate':136 'readm':152 'relat':93 'render':155 'request':57,116,193 'request/response':171 'resourc':94 'respons':216 'return':183,195 'schema':169 'send':212 'span':59 'spars':146 'specif':83 'stripe':4,18,90 'stripe invoice API' 'stripe-invoices' 'substant':163 'unclear':208 'uniform':124 'unit':106 'usdc':14,28,81,108,117 'usdc-payment' 'use':80,118 'util':69 'varieti':52 'via':72 'wallet':159 'web3':66 'without':203 'x402':2,16,39,74,96,200 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"99219b57-8517-4f9b-8400-5f1ac8537344","listingId":"6215614a-6964-42cc-9b89-2ad3c0868ff6","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:03.086Z"}],"sources":[{"listingId":"6215614a-6964-42cc-9b89-2ad3c0868ff6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:03.086Z","lastSeenAt":"2026-04-25T07:03:30.044Z"}],"details":{"listingId":"6215614a-6964-42cc-9b89-2ad3c0868ff6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/68\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/68"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/68"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically retrieving or interacting with Stripe invoice data via a pay-per-call model","Agents that need to access financial/invoice endpoints without managing API keys","Demonstrating x402 protocol payment flows on Base with USDC"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base automatically","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring well-documented, stable API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.859Z"},"updatedAt":"2026-04-25T07:03:30.044Z"}}