{"id":"62ce3d40-7e82-4634-81d2-220b0957a378","shortId":"BYC55s","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/invoices/12` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/stripe/invoices/12`) does not clearly map to any of these documented categories — its path suggests a Stripe invoice resource, but no further documentation or schema is available for it.\n\nDocumentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas, supported parameters, and detailed behavior of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe invoice API"],"warnings":["No documentation available — all doc pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided for this endpoint.","The endpoint path '/api/v1/stripe/invoices/12' does not correspond to any of the documented API categories on the landing page; its actual functionality is unknown.","The hardcoded '/12' in the path suggests a specific resource ID rather than a general-purpose endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the endpoint path (/api/v1/stripe/invoices/12) doesn't match any of the documented API categories. Effectively a stub 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'/api/v1/stripe/invoices/12':67,164 '/docs':194 '/pricing':196 '/readme':197 '/request':17,34,155 '0.02':16,33,77,154 '000':81 '20':80 '6':87 'Base network API' 'USDC API access' 'access':45,72 'actual':211 'advertis':110 'ai':10,27,122 'analysi':126 'analyt':116 'api':4,21,41,71,98,114 'avail':189 'base':7,24,61,82 'behavior':218 'behind':51 'broader':108 'call':79 'categori':112,174 'classif':129 'clear':167 'connect':202 'content':208 'convers':146 'cost':74 'data':9,26,115,119 'decim':88 'detail':217 'document':173,185,192 'embed':130 'endpoint':14,31,50,65,150,160,221 'estim':140 'exact':95 'exchang':135 'export':120 'feed':134 'financ':11,28,131 'four':111 'gas':139 'gate':3,20,44 'generat':147 'geocod':144 'howev':157 'infrastructur':142 'insight':121 'invoic':180 'json-response' 'key':99 'label':69 'learn':124 'limit':102 'list':149,162 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'made':91 'map':168 'marketplac':42 'metric':117 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':193 'paramet':215 'path':176 'pay-per-request API' 'payment':89 'per':53,78 'per-request':52 'per-request-micropayment' 'platform':5,22,109 'premium':70 'price':133,156 'prompt':204 'protocol':40 'quot':138 'rate':101,136 'remain':222 'report':118 'request':54 'request/response':212 'requir':106 'resourc':181 'return':199 'schema':187,213 'scheme':96 'sentiment':125 'settl':56 'share':151 'specif':64,159 'stripe':179 'stripe invoice API' 'subscript':105 'substant':207 'suggest':177 'summar':128 'support':214 'text':127 'token':137 'unit':83 'unknown':223 'usdc':58,85 'usdc-base' 'util':13,30,143 'valid':145 'varieti':48 'via':92 'wallet':203 'web3':132 'x402':2,19,39,94 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"571c636e-7843-47f1-a6d1-598386043335","listingId":"62ce3d40-7e82-4634-81d2-220b0957a378","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:26.480Z"}],"sources":[{"listingId":"62ce3d40-7e82-4634-81d2-220b0957a378","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:26.480Z","lastSeenAt":"2026-04-22T17:02:01.767Z"}],"details":{"listingId":"62ce3d40-7e82-4634-81d2-220b0957a378","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/12 \\\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 402 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/12"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic retrieval of invoice or payment-related data"],"bestFor":["Developers who want no-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.549Z"},"updatedAt":"2026-04-22T17:02:01.767Z"}}