{"id":"676311c3-40b9-4033-b9cf-a7bb64541f39","shortId":"fMgh2g","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 access to a Stripe invoice resource (invoice #173) behind an x402 paywall. The x402 challenge confirms the endpoint is live and accepts payment in USDC on the Base network using the \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nHowever, the specific endpoint being listed here (/api/v1/stripe/invoices/173) does not appear in the site's documented API catalog, and its purpose — labeled only as \"Premium API Access\" — is unclear. There is no OpenAPI schema, no request/response documentation, and the crawled docs, pricing, and README pages returned only a \"Connect wallet\" prompt with no additional content. The actual behavior and output of this endpoint remain unknown beyond what the x402 challenge reveals.","tags":[],"capabilities":["x402-paywall","usdc-payment","base-network","stripe-invoice","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 payment endpoint","USDC pay-per-call","lowpaymentfee","Base network API","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, README, and API pages all returned only 'Connect wallet' with no usable content","This specific endpoint (/api/v1/stripe/invoices/173) is not listed in the site's own API catalog","Purpose of 'Premium API Access' is undefined beyond the label — actual response payload is unknown","Endpoint path references a specific invoice ID (173), suggesting it may be a single-resource accessor rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/173","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty. The specific endpoint path (/api/v1/stripe/invoices/173) is not listed in the site's own API catalog, making its purpose and output entirely 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'0.02':84,139 '000':75 '173':41 '20':74 '6':80 'Base network API' 'USDC pay-per-call' 'accept':55 'access':34,179 'actual':209 'addit':206 'advertis':91 'ai':108 'amount':69 'analysi':112 'analyt':102 'api':99,144,169,178 'appear':163 'base':8,22,61,76 'base-network' 'behavior':210 'behind':42 'beyond':218 'broader':88 'call':12,26,72 'catalog':170 'challeng':48,222 'classif':115 'commit':151 'confirm':49 'connect':201 'content':207 'convers':132 'crawl':192 'crypto-gated API' 'data':101,105 'decim':81 'doc':193 'document':168,189 'embed':116 'endpoint':6,20,30,51,135,156,215 'equal':83 'estim':126 'exact':65 'exchang':121 'export':106 'feed':120 'financ':117 'gas':125 'gate':3,17 'generat':133 'geocod':130 'howev':153 'infrastructur':128 'insight':107 'invoic':5,19,38,40 'key':145 'label':174 'learn':110 'limit':148 'list':137,158 'live':53 'lowpaymentfee' 'lowpaymentfee.com':32,89 'machin':109 'maximum':68 'metric':103 'network':62 'no-api-key' 'openapi':185 'output':212 'page':197 'pay':10,24,96 'pay-per-cal':9,23 'pay-per-request':95 'payment':56 'paywal':45 'per':11,25,71,85,97,140 'platform':90 'premium':177 'price':119,194 'prompt':203 'provid':33 'purpos':173 'quot':124 'rate':122,147 'readm':196 'remain':216 'report':104 'request':86,98,141 'request/response':188 'requir':70,152 'resourc':39 'return':198 'reveal':223 'schema':186 'scheme':66 'sentiment':111 'site':166 'span':100 'specif':155 'stripe':4,18,37 'stripe invoice API' 'stripe-invoice' 'suit':93 'summar':114 'text':113 'token':123 'unclear':181 'unit':77 'unknown':217 'usdc':14,28,58,79 'usdc-payment' 'use':63 'util':129 'valid':131 'wallet':202 'web3':118 'x402':2,16,44,47,221 'x402 payment endpoint' 'x402-gated':1,15 'x402-paywall'","prices":[{"id":"03abe4e0-ff93-4a34-9a4e-b929369427b5","listingId":"676311c3-40b9-4033-b9cf-a7bb64541f39","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:50.468Z"}],"sources":[{"listingId":"676311c3-40b9-4033-b9cf-a7bb64541f39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:50.468Z","lastSeenAt":"2026-04-25T10:03:27.398Z"}],"details":{"listingId":"676311c3-40b9-4033-b9cf-a7bb64541f39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/173 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/173"},{"claim":"All listed APIs are priced at $0.02 per request 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 & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, README, and API pages returned only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically retrieving or interacting with a Stripe invoice via x402 micropayment","Demonstrating x402 protocol payment flows on the Base network","Agent-driven invoice access without traditional API key authentication"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that can settle USDC payments on Base for per-call API access","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing well-documented API contracts with clear request/response schemas","Production workloads requiring SLA guarantees or support","Anyone looking for the platform's AI, analytics, or utility endpoints (this listing covers only the invoice endpoint)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.416Z"},"updatedAt":"2026-04-25T10:03:27.398Z"}}