{"id":"d5a75908-54d4-4da8-b43c-017871ed0da2","shortId":"dUWVAu","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying 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/178` appears to be a Stripe invoice-related endpoint, though the exact functionality is not documented beyond the generic title. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and utility services. All listed endpoints share a uniform $0.02-per-request pricing model with no API keys, no rate limits, and no commitments. However, the specific invoice endpoint probed here advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide 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 confirmed live (returns a valid x402 challenge with HTTP 402), but without documentation it is unclear what request body is expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base-network","stripe-invoices","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/README pages render only a wallet-connect prompt","No OpenAPI or request/response schema provided; request body format is unknown","The endpoint path references a specific invoice ID (178), which may be a demo or placeholder resource","The broader site lists many API categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/178","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/178","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'. No OpenAPI spec, no request/response schemas, and no examples are available. The specific purpose of the /stripe/invoices/178 resource is unclear beyond the generic 'Premium API Access' 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'/api/v1/stripe/invoices/178':44 '/docs':167 '/pricing':169 '/readme':171 '0.02':117,154 '000':145 '0x8335':75 '20':144 '2913':76 '402':208 '6':150 'Base network API' 'USDC micropayment API' 'access':36 'advertis':86,140 'ai/ml':99 'analyt':98 'api':35,95,125 'appear':45 'base':8,22,70,146 'behind':37 'beyond':61 'bodi':217 'broad':88 'call':12,26,94 'catalog':89 'challeng':205 'classif':103 'commit':132 'confirm':199 'connect':177 'consist':155 'content':183 'contract':74 'data':97,107 'decim':151 'document':60,162,211 'embed':104 'endpoint':6,20,30,53,113,137,197 'equal':153 'exact':56,80 'exampl':195 'expect':219 'extrem':164 'finance/crypto':105 'function':57 'gate':3,17 'generic':63 'host':83 'howev':133 'http':207 'infer':100 'invoic':5,19,51,136 'invoice-rel':50 'key':126 'like':226 'limit':129 'list':112 'live':200 'look':225 'lowpaymentfee' 'lowpaymentfee.com':32,85 'market':106 'maxamountrequir':142 'model':122 'network':71 'no-api-key' 'openapi':187 'page':172 'pay':9,23,92 'pay-per-cal':91 'pay-per-call invoice' 'pay-per-request' 'payload':224 'payment':65 'paywal':40 'per':11,25,93,119 'per-cal':10,24 'per-request':118 'premium':34 'price':121,161 'probe':138 'prompt':179 'provid':33 'rate':128 'relat':52 'render':174 'request':120,216 'request/response':190 'resourc':43 'respons':223 'return':201 'schema':191 'scheme':81 'sentiment':101 'servic':110 'settl':67 'share':114 'site':84,159 'site-wid':158 'span':96 'spars':165 'spec':188 'specif':42,135 'stripe':4,18,49 'stripe invoice API' 'stripe-invoices' 'substant':182 'summar':102 'though':54 'titl':64 'unclear':214 'uniform':116 'unit':147 'usag':194 'usdc':14,28,73,149 'usdc-base-network' 'use':72 'util':109 'valid':203 'via':77 'wallet':178 'wide':160 'without':210 'x402':2,16,39,79,204 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"988aac4f-3ddf-4621-a592-63b3771887dd","listingId":"d5a75908-54d4-4da8-b43c-017871ed0da2","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:48.668Z"}],"sources":[{"listingId":"d5a75908-54d4-4da8-b43c-017871ed0da2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:48.668Z","lastSeenAt":"2026-04-25T10:03:27.350Z"}],"details":{"listingId":"d5a75908-54d4-4da8-b43c-017871ed0da2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/178 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/178"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/178"}],"useCases":["Retrieving or interacting with Stripe invoice data via a single paid API call","Programmatic invoice access without traditional API key management","Agent-driven payment workflows where per-call USDC settlement is preferred"],"bestFor":["Developers wanting keyless, pay-per-use Stripe invoice access","AI agents that can settle x402 payments on Base in USDC","Prototyping micropayment-gated API workflows"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume invoice processing where per-call fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.493Z"},"updatedAt":"2026-04-25T10:03:27.350Z"}}