{"id":"4928ab1d-a463-4e68-ac39-8a5814b6182d","shortId":"8XYBSs","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is confirmed live on the probed endpoint (`/api/v1/accounts/89`), which advertises a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals).\n\nThe specific endpoint `/api/v1/accounts/89` is listed under the title \"Premium API Access\" but its exact functionality is unclear — it does not map to any of the named categories on the landing page (analytics, AI, finance, infrastructure). No OpenAPI spec, detailed documentation, or example request/response payloads were found; the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. The landing page does enumerate roughly 16 other endpoints across four categories, all at the same $0.02 price point, but none provide schema details.\n\nBecause the endpoint is live (402 challenge captured) but documentation is essentially absent, consumers should treat this as a functional but poorly documented service. The payment mechanism (x402, exact scheme, USDC on Base) is well-defined, but what data the `/api/v1/accounts/89` endpoint actually returns remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no useful content","The specific endpoint /api/v1/accounts/89 ('Premium API Access') does not correspond to any named endpoint on the landing page — its purpose is unknown","No example request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/89","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/accounts/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no example requests or responses, and the specific endpoint's purpose ('Premium API Access' at /api/v1/accounts/89) is unexplained. This is effectively a stub 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'/request':13,28 '0.02':12,27,61,105,192 '000':100 '16':182 '20':99 '402':205 '6':110 'absent':212 'access':123 'across':185 'actual':243 'advertis':95 'ai':145 'ai/ml':49 'analyt':48,144 'api':5,20,37,73,122 'base':8,23,69,101,232 'base network api' 'broad':42 'call':4,19 'captur':207 'catalog':43 'categori':139,187 'challeng':85,206 'commit':81 'confirm':87 'connect':169 'consum':213 'content':175 'data':47,52,239 'decim':111 'defin':236 'detail':151,199 'doc':160 'document':152,209,222 'enabl':36 'endpoint':45,57,92,114,184,202,242 'enumer':180 'essenti':211 'everi':56 'exact':126,228 'exampl':154 'financ':146 'finance/web3':51 'found':158 'four':186 'function':127,219 'infer':50 'infrastructur':54,147 'json-response' 'key':74 'land':142,177 'limit':77 'list':117 'live':88,204 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'map':133 'maxamountrequir':97 'mechan':226 'micropayment api' 'name':138 'network':9,24,70 'no-api-key' 'none':196 'offer':40 'openapi':149 'page':143,164,178 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':156 'payment':84,225 'per':3,18,62 'platform':6,21,38 'point':194 'poor':221 'post-method' 'premium':121 'price':59,161,193 'probe':91 'prompt':171 'provid':197 'rate':76 'readm':163 'remain':245 'render':166 'request':63 'request/response':155 'return':244 'rough':181 'schema':198 'scheme':229 'servic':223 'sinc':107 'span':46 'spec':150 'specif':113 'substant':174 'titl':120 'treat':215 'unclear':129 'unit':102 'unknown':246 'upfront':80 'usd':106 'usdc':15,30,66,104,108,230 'usdc api' 'usdc-base-network' 'use':109 'util':55 'via':10,25 'wallet':170 'well':235 'well-defin':234 'x402':11,26,35,83,227 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2e2e15a0-d0e3-412d-a614-112e86ae5536","listingId":"4928ab1d-a463-4e68-ac39-8a5814b6182d","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/accounts/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:16.453Z"}],"sources":[{"listingId":"4928ab1d-a463-4e68-ac39-8a5814b6182d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:16.453Z","lastSeenAt":"2026-04-22T18:31:09.159Z"}],"details":{"listingId":"4928ab1d-a463-4e68-ac39-8a5814b6182d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/89 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/89"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.603Z"},"updatedAt":"2026-04-22T18:31:09.159Z"}}