{"id":"5632ab9f-2d07-4f9c-b4ea-050b77d61d07","shortId":"cJ5p7R","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/accounts/110` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 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 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 listed endpoints share the same $0.02/request pricing.\n\nHowever, the specific functionality behind `/api/v1/accounts/110` is not documented beyond its \"Premium API Access\" label. There is no OpenAPI spec, no request/response schema, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint is confirmed live (returns a well-formed 402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment-gating","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/accounts/110 ('Premium API Access') is undocumented; it is unclear what data or service is returned upon payment","No OpenAPI spec or request/response schema is provided","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/110","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/110","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 x402 402 challenge, but there is zero documentation on what the endpoint actually returns. No OpenAPI spec, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The actual functionality of /api/v1/accounts/110 is completely 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'/request':168 '0.02':10,28,86,167 '000':90 '0x8335':77 '20':89 '2913':78 '402':221 '6':94 'Base network API' 'USDC micropayment API' 'accept':68 'access':6,24,66,183 'across':125 'actual':229 'advertis':123 'ai':135 'analysi':139 'analyt':129 'api':5,16,23,34,46,65,97,182,198 'attach':108 'base':8,26,55,80,91 'base-network' 'behind':174 'beyond':179 'broader':121 'call':45 'caller':106 'categori':127 'challeng':222 'classif':142 'commit':103 'confirm':214 'connect':204 'content':210 'contract':76 'convers':159 'cost':84 'crypto-gated endpoint' 'data':128,132,225 'decim':95 'doc':195 'document':178 'embed':143 'endpoint':47,59,124,163,212 'estim':153 'exchang':148 'export':133 'feed':147 'financ':144 'form':220 'four':126 'function':173 'gas':152 'gate':3,21,48 'generat':160 'geocod':157 'header':113 'howev':170 'infrastructur':155 'insight':134 'key':17,35,98 'label':63,184 'learn':137 'limit':100 'list':162 'live':215 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':136 'maximum':83 'metric':130 'network':56 'no-api-key' 'offer':38 'openapi':188 'page':199 'pay':9,27,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':71,112,118,233 'per':11,29,44,87 'platform':122 'post':69 'post-endpoint' 'premium':4,22,64,181 'premium API access' 'price':146,169,196 'prompt':206 'proof':119 'protocol':52 'quot':151 'rate':99,149 'render':201 'report':131 'request':12,30,70,88 'request/response':191 'requir':18,36,105 'return':216,230 'schema':192 'sentiment':138 'servic':227 'settl':73 'share':164 'simpli':107 'spec':189 'specif':58,172 'success':232 'suit':40 'summar':141 'text':140 'token':150 'unit':92 'unknown':235 'upfront':102 'upon':231 'usdc':14,32,75 'usdc-settlement' 'util':156 'valid':116,158 'wallet':205 'web3':145 'well':219 'well-form':218 'x':111 'x-payment':110 'x402':2,20,51,117 'x402 API' 'x402-gated':1,19 'x402-payment-gating'","prices":[{"id":"29726281-576e-4de1-ace6-e805e448445b","listingId":"5632ab9f-2d07-4f9c-b4ea-050b77d61d07","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:41.303Z"}],"sources":[{"listingId":"5632ab9f-2d07-4f9c-b4ea-050b77d61d07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:41.303Z","lastSeenAt":"2026-04-24T02:02:05.228Z"}],"details":{"listingId":"5632ab9f-2d07-4f9c-b4ea-050b77d61d07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/110 \\\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 with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/110"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/110"},{"claim":"All listed endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API key registration","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-only payment methods","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.428Z"},"updatedAt":"2026-04-24T02:02:05.228Z"}}