{"id":"6e8d11ad-311e-4fb4-b663-4c5ee07c5935","shortId":"Q5auMQ","kind":"x402","title":"Pay-per-request invoice and utility APIs on Base via x402, $0.02/call in USDC.","tagline":"Pay-per-request invoice and utility APIs on Base via x402, $0.02/call in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/invoices/10` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The site advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access.\n\nThe broader platform offers endpoints spanning several categories: 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 endpoints follow the same x402 payment model on Base with USDC.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/invoices/10` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the name.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","invoice-api"],"categories":["finance","infrastructure"],"synonyms":["invoice API","premium API access","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific functionality of '/api/v1/invoices/10' ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/10","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/10","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 challenge, but there is zero documentation on what the endpoint actually returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The purpose of '/api/v1/invoices/10' is unclear beyond its 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'/api/v1/invoices/10':59,194 '/call':14,30 '/docs':162 '/pricing':164 '/readme':166 '0.02':13,29,79,88 '000':74 '20':73 'Base network API' 'USDC micropayment API' 'access':64,103,221 'across':91 'actual':196 'advertis':85 'ai':119 'analysi':123 'analyt':113 'api':8,24,42,63,96,220 'base':10,26,51,75,154 'base-network' 'beyond':223 'broader':105 'call':82 'categori':111 'challeng':69,208 'classif':126 'collect':36 'connect':172 'content':178 'convers':143 'data':112,116,216 'detail':189 'document':157,190,211 'embed':127 'endpoint':43,57,93,108,146,195,199 'estim':137 'exampl':186 'exchang':132 'export':117 'extrem':159 'feed':131 'financ':128 'flat':87 'follow':147 'function':218 'gas':136 'generat':144 'geocod':141 'host':34 'infrastructur':139 'insight':118 'instant':102 'invoic':5,21 'invoice API' 'invoice-api' 'key':97 'label':61 'learn':121 'limit':100 'live':201 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':120 'metric':114 'model':152 'name':225 'network':52 'no-api-key' 'offer':107 'openapi':182 'page':167 'pay':2,18,39 'pay-per-call API' 'pay-per-request':1,17,38 'payment':151 'per':3,19,40,81,89 'platform':106 'premium':62,219 'premium API access' 'price':130 'prompt':174 'protocol':48 'provid':222 'quot':135 'rate':99,133 'render':169 'report':115 'request':4,20,41,70,90 'request/response':185 'respond':203 'return':66,197 'schema':183 'sentiment':122 'settl':44 'sever':110 'site':84 'span':109 'spars':160 'specif':56 'summar':125 'text':124 'token':134 'unclear':214 'unit':76 'usd':80 'usdc':16,32,54,78,156 'usdc-settlement' 'use':53 'util':7,23,140 'valid':142,206 'via':11,27,45 'wallet':173 'web3':129 'without':210 'x402':12,28,47,68,150,207 'x402 endpoint' 'x402-payment'","prices":[{"id":"f207ae0c-36ff-46e0-becf-32a862923803","listingId":"6e8d11ad-311e-4fb4-b663-4c5ee07c5935","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/invoices/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:24.094Z"}],"sources":[{"listingId":"6e8d11ad-311e-4fb4-b663-4c5ee07c5935","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:24.094Z","lastSeenAt":"2026-04-28T22:34:00.453Z"}],"details":{"listingId":"6e8d11ad-311e-4fb4-b663-4c5ee07c5935","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/10 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/10"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/10"}],"useCases":["Retrieving invoice data via a single paid API call without needing an API key","Programmatic access to invoice records settled with USDC on Base","Agent-driven invoice lookups with per-request crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost ($0.02) individual API calls without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.79Z"},"updatedAt":"2026-04-28T22:34:00.453Z"}}