{"id":"2ee7f6cc-5c82-4aef-8082-75df5f44c155","shortId":"Qn3Qce","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the x402 payment header.\n\nThe specific endpoint at `/api/v1/invoices/8` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 per request price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is live (returns a valid x402 402 challenge), but without documentation it is unclear what request body this particular invoices endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found for any endpoint","The specific purpose and expected input/output of /api/v1/invoices/8 is undocumented","The broader platform lists many endpoints but none have documented request/response formats","Cannot verify that the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/8","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/invoices/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of the specific /invoices/8 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/invoices/8':99 '/docs':162 '/pricing':163 '/readme':166 '/request':13,30 '0.02':12,29,69,121,152 '000':115 '20':114 '402':109,206 '402 payment api' 'access':51,105 'across':57 'advertis':127 'ai-inference' 'ai/ml':60 'analysi':131 'analyt':59 'api':5,15,22,32,42,78,104 'avail':193 'base':8,25,74,116,123 'base network api' 'bodi':216 'broader':125 'call':4,21,67 'challeng':110,207 'classif':134 'classification' 'commit':84 'connect':172 'convers':144 'cost':68 'crawl':196 'data':58,146 'data-analytics' 'detail':179 'document':157,188,210 'embed':135 'embeddings' 'endpoint':56,97,128,199,220 'estim':141 'exampl':192 'exchang':138 'expect':221 'export':147 'extrem':159 'feed':137 'finance-data' 'finance/web3':62 'gas':140 'gate':50 'geocod':142 'geocoding' 'handl':88 'header':94 'i.e':120 'infer':61 'infrastructur':64 'inlin':89 'invoic':219 'key':16,33,79 'limit':81 'list':101 'live':201 'low payment fee' 'lowpaymentfee.com':35 'materi':197 'micropayment api' 'network':9,26,75 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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/invoices/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:31.883Z"}],"sources":[{"listingId":"2ee7f6cc-5c82-4aef-8082-75df5f44c155","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:31.883Z","lastSeenAt":"2026-04-22T21:30:29.946Z"}],"details":{"listingId":"2ee7f6cc-5c82-4aef-8082-75df5f44c155","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/8 \\\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 platform charges $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/invoices/8 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/8"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without subscription","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion with instant pay-per-use billing","Exporting data or generating analytics reports without needing API key provisioning"],"bestFor":["Agents or developers who want instant, keyless API access paid in USDC on Base","Low-volume or sporadic API consumers who don't want subscriptions","Web3-native applications that can settle payments on-chain per request"],"notFor":["High-volume production workloads where $0.02/request adds up and bulk pricing is needed","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.571Z"},"updatedAt":"2026-04-22T21:30:29.946Z"}}