{"id":"b4ed3577-afc3-4d20-b892-b2d79995b530","shortId":"xYn6qj","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/accounts/51` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 are listed at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/accounts/51` endpoint, whose exact functionality beyond \"Premium API Access\" is not documented.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema specification found; request and response formats are unknown.","The exact functionality of /api/v1/accounts/51 ('Premium API Access') is not described anywhere.","Cannot verify what data or service is returned upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/51","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of this specific endpoint is completely undocumented. The docs pages are empty beyond a wallet-connect 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'/api/v1/accounts/51':56,177 '/docs':194 '/pricing':196 '/readme':198 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':234 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,185 'across':124 'actual':243 'addit':209 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95,184 'attach':106 'avail':225 'base':9,24,50,75,83 'base-network' 'beyond':182 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':236 'classif':141 'collect':34 'commit':101 'confirm':229 'connect':204 'contract':71 'convers':158 'cover':174 'crypto-paid endpoint' 'data':127,131,239 'decim':93 'detail':211 'document':188,189,220 'embed':142 'endpoint':41,54,123,178,227 'equal':86 'estim':152 'exact':180 'exampl':223 'exchang':147 'export':132 'extrem':191 'feed':146 'financ':143 'four':125 'function':181 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'howev':170 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':162,173 'live':230 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'maximum':78 'metric':129 'network':51 'no-api-key' 'openapi':215 'page':199 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':224 'payment':46,66,110,116,247 'per':3,18,38,88 'platform':121 'point':169 'post':64 'post-endpoint' 'premium':5,20,59,183 'premium API access' 'price':145,168 'prompt':206 'proof':117 'proper':233 'protocol':47 'quot':150 'rate':97,148 'render':201 'report':130 'request':39,65,89 'request/response':218 'requir':103 'return':231,244 'schema':219 'sentiment':137 'servic':241 'settl':68 'simpli':105 'spars':192 'spec':216 'specif':53,172 'success':246 'summar':140 'technic':210 'text':139 'token':149 'unit':84 'unknown':249 'upfront':100 'upon':245 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':205 'web3':144 'whose':179 'x':109 'x-payment':108 'x402':11,26,45,115,235 'x402 API' 'x402-payment'","prices":[{"id":"c37ad21f-e34a-40bb-a4cc-d389c23c2b69","listingId":"b4ed3577-afc3-4d20-b892-b2d79995b530","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:46.830Z"}],"sources":[{"listingId":"b4ed3577-afc3-4d20-b892-b2d79995b530","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:46.830Z","lastSeenAt":"2026-04-23T09:00:49.719Z"}],"details":{"listingId":"b4ed3577-afc3-4d20-b892-b2d79995b530","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 v1) to pay $0.02 USDC on Base.\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/51 \\\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":"Endpoint returns 402 with x402 v1 challenge, maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/51"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/51"},{"claim":"Platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring well-documented schemas and error handling","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.99Z"},"updatedAt":"2026-04-23T09:00:49.719Z"}}