{"id":"49b0ab2d-05db-4e89-806d-ca5f31115393","shortId":"ccnLRm","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific resource path (`/api/v1/stripe/invoices/87`) suggests it returns invoice or billing-related data, though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site-wide pricing of $0.02/request displayed on the provider's landing page. The provider emphasizes no API keys, no rate limits, and instant access; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers a range of endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all at the same $0.02/request price point. Documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","invoice-data","json-response"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","invoice API","stripe invoice data","lowpaymentfee"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt","No request or response schema provided; the exact data returned by this endpoint is unknown","The endpoint path references a specific invoice ID (87), which may indicate a demo or placeholder resource rather than a general-purpose API","No OpenAPI or ai-plugin manifest discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/87","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/87","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 documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of the /stripe/invoices/87 path is undocumented. This is effectively a stub 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'/api/v1/stripe/invoices/87':45 '/docs':187 '/pricing':189 '/readme':191 '/request':111,175 '0.02':99,110,174 '000':88 '0x8335':73 '20':87 '2913':74 '6':94 'Base network API' 'USDC micropayment endpoint' 'access':6,20,36,130 'advertis':83 'ai/ml':157 'analysi':160 'analyt':156 'api':5,19,35,123 'attach':133 'avail':214 'base':8,22,68,89 'base-network' 'behind':37 'beyond':179 'bill':52 'billing-rel':51 'broader':146 'caller':131 'challeng':82 'classif':162 'connect':197 'consist':102 'contract':72 'convert':97 'data':54,155,165 'decim':95 'detail':204 'display':112 'document':62,178 'embed':163 'emphas':121 'endpoint':30,153 'exact':57,78 'exampl':212 'extrem':184 'feed':166 'finance/crypto':164 'gate':3,17 'header':138 'infer':158 'instant':129 'invoic':49 'invoice API' 'invoice-data' 'json-response' 'key':124 'land':117,181 'limit':127 'lowpaymentfee' 'lowpaymentfee.com':32,147 'maxamountrequir':85 'network':69 'offer':149 'openapi':206 'page':118,182,192 'paid':9,23 'path':44 'pay-per-call API' 'payload':59 'payment':63,137,143 'paywal':40 'per':11,25,100 'per-request':10,24 'per-request-pricing' 'platform':148 'point':177 'premium':4,18,34 'price':108,176 'prompt':199 'proof':144 'provid':33,115,120 'rang':151 'rate':126 'relat':53 'render':194 'request':12,26,101 'request/response':208 'resourc':43 'respons':58 'return':48 'schema':209 'scheme':79 'sentiment':159 'servic':169 'settl':65 'simpli':132 'sinc':91 'site':106 'site-wid':105 'span':154 'spars':185 'spec':207 'specif':42 'stripe invoice data' 'suggest':46 'summar':161 'technic':203 'though':55 'unit':90 'usag':211 'usdc':14,28,71,92 'usdc-settlement' 'use':70,93 'util':168 'valid':141 'via':75 'wallet':198 'wide':107 'x':136 'x-payment':135 'x402':2,16,39,77,81,142 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f59f8974-93ee-49fb-a836-c98487c7afdb","listingId":"49b0ab2d-05db-4e89-806d-ca5f31115393","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:12.090Z"}],"sources":[{"listingId":"49b0ab2d-05db-4e89-806d-ca5f31115393","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:12.090Z","lastSeenAt":"2026-04-26T16:36:09.521Z"}],"details":{"listingId":"49b0ab2d-05db-4e89-806d-ca5f31115393","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/87 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/87"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/87"}],"useCases":["Retrieving invoice or billing data behind a per-request paywall","Programmatic access to premium data without API key registration","Agent-driven workflows that need on-demand paid data retrieval"],"bestFor":["Agents or scripts that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access","Low-volume callers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch processing where per-request fees add up quickly","Callers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.416Z"},"updatedAt":"2026-04-26T16:36:09.521Z"}}