{"id":"ddf9ba9f-58db-4ae3-8bee-259391808308","shortId":"QvRKbk","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-53`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nThe broader lowpaymentfee.com platform advertises multiple API 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 (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, this particular endpoint path (`/api/endpoint-53`) does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe platform emphasizes simplicity: no API keys, no rate limits, no minimums, and instant access. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed capability descriptions available beyond what the landing page and x402 challenge provide.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["general","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The path /api/endpoint-53 does not correspond to any documented endpoint on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories but provides no detailed docs for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-53","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/endpoint-53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/endpoint-53 is unknown — it doesn't match any named endpoint on the site. Documentation pages are empty stubs. No input/output schema, no examples, and no description of what the endpoint actually 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'/docs':203 '/pricing':204 '/readme':205 '/request':12,30,156 '0.02':11,29,94,155 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':110 '20':87 '6':100 'Base network API' 'USDC micropayment API' 'accept':69 'access':48,67,200 'address':109 'advertis':115 'ai':126 'analysi':130 'analyt':120 'api':6,16,24,34,46,66,117,191 'avail':228 'base':8,26,56,73,89 'beyond':229 'broader':112 'call':4,22 'capabl':226 'categori':118 'chain':107 'challeng':76,236 'charg':83 'classif':133 'collect':40 'confirm':77 'connect':209 'content':215 'convers':149 'crypto-paid API' 'data':119,123 'decim':101 'descript':227 'detail':225 'document':201,221 'embed':134 'emphas':188 'endpoint':47,60,79,162,173 'estim':144 'exact':182 'exampl':223 'exchang':139 'export':124 'feed':138 'financ':135 'function':183 'gas':143 'generat':150 'geocod':147 'host':38 'howev':159 'i.e':93 'infrastructur':146 'insight':125 'instant':199 'json-response' 'key':17,35,192 'land':178,232 'learn':128 'limit':195 'list':63 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,113 'machin':127 'map':167 'maximum':85 'metric':121 'minimum':197 'multipl':116 'name':172 'network':57 'no-api-key' 'on-chain':105 'page':179,202,233 'particular':161 'path':163 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,102 'per':3,21,44,95 'platform':114,187 'point':158 'premium':5,23,65 'premium API access' 'price':137,157 'prompt':211 'protocol':53 'provid':237 'quot':142 'rate':140,194 'report':122 'request':45,96 'request/response':222 'requir':18,36 'return':206 'schema':220 'sentiment':129 'settl':104 'simplic':189 'sinc':97 'site':176 'specif':59 'substant':214 'summar':132 'text':131 'token':141 'unclear':185 'unit':90 'usdc':14,32,70,92,98 'usdc-base' 'use':99 'valid':148 'via':9,27,49 'wallet':210 'web3':136 'x402':10,28,51,75,235 'x402 API' 'x402-payment'","prices":[{"id":"3272027a-e61a-4575-81e7-a400c43a0ccf","listingId":"ddf9ba9f-58db-4ae3-8bee-259391808308","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/endpoint-53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:40.857Z"}],"sources":[{"listingId":"ddf9ba9f-58db-4ae3-8bee-259391808308","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:40.857Z","lastSeenAt":"2026-04-22T12:03:13.619Z"}],"details":{"listingId":"ddf9ba9f-58db-4ae3-8bee-259391808308","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (i.e., $0.02).","source_url":"https://lowpaymentfee.com/api/endpoint-53"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network is used for payment.","source_url":"https://lowpaymentfee.com/api/endpoint-53"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that can settle USDC payments on Base","Users who want pay-as-you-go access without signup or API keys"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible wallet or USDC balance","Use cases requiring well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.274Z"},"updatedAt":"2026-04-22T12:03:13.619Z"}}