{"id":"89917687-9f0c-4eaf-91e3-6b0ac4fbf55b","shortId":"gsudY6","kind":"x402","title":"Pay-per-request premium API access via x402 on Base, settled in USDC at $0.02/call.","tagline":"Pay-per-request premium API access via x402 on Base, settled in USDC at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that gates every endpoint behind the x402 payment protocol, settling in USDC on the Base network. The specific endpoint at `/api/v1/invoices/43` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (0.02 USD) per request. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader site offers endpoints across four 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 are uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/invoices/43`) is confirmed live, returning a proper 402 challenge with x402 version 1. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`. Documentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","invoice API","premium API access"],"warnings":["No OpenAPI or schema documentation available — the actual request body and response format for /api/v1/invoices/43 are unknown.","All secondary pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.","The specific purpose of the /api/v1/invoices/43 endpoint is unclear; 'Premium API Access' is a generic label that does not describe functionality.","Cannot verify what data or service is actually returned upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/43","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/43","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 with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the specific functionality of `/api/v1/invoices/43` is entirely opaque. The docs, pricing, and README pages are all empty 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'/call':17,34 '0.02':16,33,82,159 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':184 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':191 '1':177 '20':76 '402':172 'Base network API' 'USDC micropayment API' 'accept':194 'access':7,24,69,97 'across':117 'address':183 'advertis':88 'ai':127 'analysi':131 'analyt':121 'api':6,23,41,68,90,210 'application/json':199 'attach':100 'base':11,28,57,78,190 'base-network' 'behind':47 'beyond':201 'broader':113 'caller':98 'categori':40,119 'challeng':173 'classif':134 'confirm':167 'connect':219 'content':225 'contract':188 'convers':151 'data':120,124 'direct':181 'doc':209 'document':200 'embed':135 'endpoint':46,61,116,154,164,193 'estim':145 'everi':45 'exchang':140 'export':125 'extrem':206 'feed':139 'financ':136 'four':118 'gas':144 'gate':44 'generat':152 'geocod':149 'header':105 'infrastructur':147 'insight':126 'instant':96 'invoice API' 'json-response' 'key':91 'land':203 'learn':129 'limit':94 'list':65 'live':168 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':128 'maximum':73 'metric':122 'multi':39 'multi-categori':38 'network':58 'no-api-key' 'offer':115 'page':204,214 'particular':163 'pay':2,19 'pay-per-call API' 'pay-per-request':1,18 'payment':50,74,104,110,179 'per':3,20,84,160 'platform':42,87 'post':195 'post-method' 'premium':5,22,67 'premium API access' 'price':138,157,211 'prompt':221 'proof':111 'proper':171 'protocol':51 'quot':143 'rate':93,141 'readm':213 'render':216 'report':123 'request':4,21,85,161,196 'requir':71 'return':169,198 'sentiment':130 'settl':12,29,52 'simpli':99 'site':114 'specif':60 'substant':224 'summar':133 'text':132 'thin':207 'token':142 'uniform':156 'unit':79 'usd':83 'usdc':14,31,54,81,187 'usdc-settlement' 'use':185 'util':148 'valid':108,150 'version':176 'via':8,25 'wallet':220 'web3':137 'x':103 'x-payment':102 'x402':9,26,49,109,175 'x402 API' 'x402-payment'","prices":[{"id":"8062733e-5476-41b3-add8-5ecf1968a8d0","listingId":"89917687-9f0c-4eaf-91e3-6b0ac4fbf55b","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:17.316Z"}],"sources":[{"listingId":"89917687-9f0c-4eaf-91e3-6b0ac4fbf55b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:17.316Z","lastSeenAt":"2026-04-24T11:31:41.607Z"}],"details":{"listingId":"89917687-9f0c-4eaf-91e3-6b0ac4fbf55b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/43 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 a 402 challenge with x402 version 1, maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/43"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/43"}],"useCases":["Programmatic access to premium data or services without API key registration","Agent-driven workflows that need instant, keyless API access with crypto micropayments","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers or agents with USDC on Base who want frictionless pay-per-call access","Exploring x402 protocol mechanics with a low-cost live endpoint","Scenarios requiring no signup, no rate limits, and immediate access"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where $0.02/request adds up and subscription pricing would be cheaper","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.335Z"},"updatedAt":"2026-04-24T11:31:41.607Z"}}