{"id":"992a5125-ac03-415c-a623-258583679e45","shortId":"jPb8pD","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/accounts/45` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/accounts/45` endpoint actually returns. The landing page lists 16 different API endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), all at the same $0.02 price point, but provides no detail on request parameters or response formats for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The purpose of /api/v1/accounts/45 is unclear — 'Premium API Access' is a generic label with no further explanation","No request parameters or response format documented anywhere","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the /api/v1/accounts/45 endpoint actually does beyond the generic label 'Premium API Access'. The docs, pricing, and README pages are all blank (just 'Connect 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'/api/v1/accounts/45':110,198 '/docs':166 '/pricing':167 '/readme':170 '/request':13,30 '0.02':12,29,63,137,224 '000':126 '0x8335':131 '16':206 '20':125 '2913':132 '300':150 '402':120 '402 payment API' '6':141 'Base network API' 'USDC API' 'accept':155 'access':116 'across':210 'actual':200 'ai':215 'ai/ml':53 'analyt':52,214 'api':5,15,22,32,41,80,115,208 'application/json':160 'attach':92 'base':8,25,71,127,134 'broad':46 'call':4,21 'caller':90 'categori':212 'challeng':121 'connect':176 'content':182 'cost':62 'data':51,56,213 'decim':142 'detail':230 'differ':207 'document':161,191 'enabl':40 'endpoint':49,61,108,154,199,209 'equal':136 'everi':60 'exact':147 'exampl':194 'extrem':163 'financ':217 'finance/web3':55 'format':236 'four':211 'given':138 'header':97 'infer':54 'infrastructur':219 'json-api' 'key':16,33,81 'land':203 'limit':89 'list':112,205 'lowpaymentfee' 'lowpaymentfee.com':35 'mean':76 'micropayment API' 'ml':216 'network':72 'no-api-key' 'offer':44 'openapi':186 'page':171,204 'paid':66 'paramet':233 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':96,101,144 'per':3,20,64 'platform':6,23,42 'point':226 'post':156 'post-method' 'premium':114 'price':225 'prompt':178 'proof':102 'protocol':75 'provid':228 'rate':88 'render':173 'request':65,105,122,157,232 'request/response':189 'requir':17,34 'respons':235 'return':118,159,201 'schema':190 'scheme':145 'second':151 'servic':59 'set':47 'sign':84 'sign-up':83 'simpli':91 'span':50 'spars':164 'spec':187 'specif':107 'timeout':152 'unit':128 'up':85 'usdc':9,26,68,130,139 'usdc-base' 'util':58 'valid':100 'via':10,27 'wallet':177 'web3':218 'x':95 'x-payment':94 'x402':11,28,39,74 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"68b4abc9-8b5d-488a-a84e-3899acaa805d","listingId":"992a5125-ac03-415c-a623-258583679e45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:41.925Z"}],"sources":[{"listingId":"992a5125-ac03-415c-a623-258583679e45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:41.925Z","lastSeenAt":"2026-04-24T20:02:15.926Z"}],"details":{"listingId":"992a5125-ac03-415c-a623-258583679e45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/45 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/accounts/45"},{"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":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/45"},{"claim":"16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on Base who want low-friction API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible wallet or USDC holdings","High-volume consumers who prefer subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.214Z"},"updatedAt":"2026-04-24T20:02:15.926Z"}}