{"id":"4da07b0a-d86e-4f8e-b355-9f20202fa740","shortId":"JHuBKK","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-52`) 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). 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 listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-52`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nPayment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The endpoint accepts POST requests and returns `application/json`. Documentation pages (docs, pricing, README) all rendered only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","http-post"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The endpoint path /api/endpoint-52 does not match any of the named endpoints listed on the provider's landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The provider site appears to be a generic x402 demo or template rather than a production service with well-defined APIs."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-52","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-52","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-52 is completely undocumented. No OpenAPI schema, no response examples, and all doc pages render only 'Connect wallet'. The endpoint path doesn't match any named API on the landing 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'/request':12,30,175 '0.02':11,29,94,174 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':208 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':211 '20':87 '6':100 'Base network API' 'USDC API' 'accept':69,216 'access':48,67 'across':132 'addit':236 'address':207 'advertis':130 'ai':142 'analysi':146 'analyt':136 'api':6,16,24,34,46,66,103 'application/json':221 'attach':114 'base':8,26,56,73,89,213 'broader':127 'call':4,22 'caller':112 'categori':134 'challeng':76 'charg':83 'classif':149 'collect':40 'commit':109 'confirm':77 'connect':231 'convers':166 'correspond':185 'data':135,139 'decim':101 'detail':238 'doc':224 'document':222 'embed':150 'endpoint':47,60,79,131,170,180,191,215 'estim':160 'exact':200 'exchang':155 'export':140 'feed':154 'financ':151 'four':133 'function':201 'gas':159 'generat':167 'geocod':164 'header':119 'host':38 'howev':177 'http-post' 'i.e':93 'infrastructur':162 'insight':141 'json-response' 'key':17,35,104 'land':196 'learn':144 'limit':106 'list':63,169 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,128 'machin':143 'maximum':85 'metric':137 'micropayment API' 'name':190 'network':57 'no-api-key' 'page':197,223 'particular':179 'path':181 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,118,124,204 'per':3,21,44,95 'platform':129 'post':217 'premium':5,23,65 'premium API' 'price':153,176,225 'prompt':233 'proof':125 'protocol':53 'quot':158 'rate':105,156 'readm':226 'render':228 'report':138 'request':45,96,218 'requir':18,36,111 'return':220 'sentiment':145 'settl':205 'share':171 'simpli':113 'sinc':97 'site':194 'specif':59 'summar':148 'technic':237 'text':147 'token':157 'unclear':203 'unit':90 'upfront':108 'usdc':14,32,70,92,98,210 'usdc-base' 'use':99,209 'util':163 'valid':122,165 'via':9,27,49 'wallet':232 'web3':152 'x':117 'x-payment':116 'x402':10,28,51,75,123 'x402 endpoint' 'x402-payment'","prices":[{"id":"ec2283c8-4522-43c1-9f9f-3bbf7368953e","listingId":"4da07b0a-d86e-4f8e-b355-9f20202fa740","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-52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:22.154Z"}],"sources":[{"listingId":"4da07b0a-d86e-4f8e-b355-9f20202fa740","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:22.154Z","lastSeenAt":"2026-04-22T12:03:12.426Z"}],"details":{"listingId":"4da07b0a-d86e-4f8e-b355-9f20202fa740","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-52 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{},"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, equating to $0.02 per request.","source_url":"https://lowpaymentfee.com/api/endpoint-52"},{"claim":"The landing page lists endpoints at $0.02/request with 'No API keys, No rate limits, Instant access, Base network'.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and uses 6 decimals.","source_url":"https://lowpaymentfee.com/api/endpoint-52"},{"claim":"Documentation, pricing, and README pages all rendered only 'Connect wallet' with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that can settle USDC on Base for API calls","Users who want no-signup, no-key API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","Use cases requiring known, well-documented endpoint behavior (this endpoint's function is unspecified)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.143Z"},"updatedAt":"2026-04-22T12:03:12.426Z"}}