{"id":"dc04bdff-add0-43d0-858e-42e4ed4999de","shortId":"sp7yXQ","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 access to a Stripe invoice resource (invoice ID 150) behind an x402 paywall. The endpoint accepts POST requests and returns application/json responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here (/api/v1/stripe/invoices/150) is not among the publicly documented API categories on the landing page, so its exact response payload and purpose are unclear.\n\nThe x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live. No OpenAPI spec, detailed documentation, or example responses were available from the crawl — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoices","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice api","x402 paid api","usdc micropayment api","base network api","pay-per-request endpoint","lowpaymentfee"],"warnings":["No OpenAPI spec or detailed documentation available","The /api/v1/stripe/invoices/150 endpoint is not listed among the publicly advertised APIs on the landing page","Docs, API, pricing, and README pages returned no substantive content (only 'Connect wallet')","Response schema and expected POST body are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/150","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no OpenAPI schema, no example request/response, and no documentation beyond a landing page listing. The specific endpoint (/api/v1/stripe/invoices/150) is not documented on the site. This is effectively a stub 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'0.02':73,121 '000':77 '0x8335':66 '150':42 '20':76 '2913':67 '402':171 '6':81 'accept':49,177 'access':34 'advertis':87 'ai/ml':99 'among':145 'analysi':102 'analyt':98 'api':95,126,149,199 'application/json':54 'array':178 'avail':193 'base':8,22,61,78 'base network api' 'behind':43 'broader':84 'call':12,26,94 'captur':169 'categori':150 'challeng':166 'classif':104 'commit':134 'confirm':179 'connect':208 'content':214 'contract':65 'convers':114 'cost':71 'crawl':196 'data':97,108 'decim':82 'detail':187 'doc':198 'document':148,188 'embed':105 'endpoint':6,20,30,48,117,138,181 'exact':157 'exampl':190 'finance/crypto':106 'form':176 'gate':3,17 'generat':115 'geocod':112 'howev':135 'http':170 'id':41 'infer':100 'invoic':5,19,38,40 'key':127 'land':153 'limit':130 'list':119,140 'live':183 'lowpaymentfee' 'lowpaymentfee.com':32,85 'market':107 'maximum':70 'minimum':133 'network':62 'no-api-key' 'openapi':185 'page':154,203 'paid':9,23 'pay':92 'pay-per-cal':91 'pay-per-call' 'pay-per-request endpoint' 'payload':159 'payment':56 'paywal':46 'per':11,25,74,93,122 'per-cal':10,24 'platform':86 'post':50 'price':200 'prompt':210 'provid':33 'public':147 'purpos':161 'rate':129 'readm':202 'request':51,75,123 'resourc':39 'respons':55,158,191 'return':53,205 'sentiment':101 'servic':111 'settl':58 'span':96 'spec':186 'specif':137 'stripe':4,18,37 'stripe invoice api' 'stripe-invoices' 'substant':213 'success':168 'suit':89 'summar':103 'unclear':163 'unit':79 'usdc':14,28,64 'usdc micropayment api' 'usdc-base' 'use':63 'util':110 'valid':113 'wallet':209 'well':175 'well-form':174 'x402':2,16,45,165 'x402 paid api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"76acd600-f202-4af7-80a2-87d852d4fba2","listingId":"dc04bdff-add0-43d0-858e-42e4ed4999de","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:39.057Z"}],"sources":[{"listingId":"dc04bdff-add0-43d0-858e-42e4ed4999de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:39.057Z","lastSeenAt":"2026-04-25T13:03:04.195Z"}],"details":{"listingId":"dc04bdff-add0-43d0-858e-42e4ed4999de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/150\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/150"},{"claim":"The platform advertises $0.02/request pricing 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/150"}],"useCases":["Retrieving Stripe invoice data via a crypto-paywall without traditional API keys","Programmatic access to invoice records settled with USDC on Base","Agent-driven invoice lookup with per-call micropayments"],"bestFor":["Developers wanting keyless, pay-per-call access to invoice data","AI agents that can settle x402 payments in USDC on Base","Scenarios requiring no subscription or rate-limit constraints"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Bulk invoice retrieval where per-call pricing would be expensive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.92Z"},"updatedAt":"2026-04-25T13:03:04.195Z"}}