{"id":"0b0abb42-d4ef-431d-b33d-ffff8b0e0bef","shortId":"VXfr3K","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-15`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges up to 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-15`) 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) returned only a \"Connect wallet\" prompt with no substantive content during crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium endpoint","crypto-paid API"],"warnings":["The path /api/endpoint-15 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 'Connect wallet' with no substantive content.","No OpenAPI spec, no input/output schema, and no example responses 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-15","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-15","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 exact functionality of /api/endpoint-15 is completely undocumented. No OpenAPI schema, no response examples, and all documentation pages returned only 'Connect wallet' with no content. The endpoint path doesn't match any named API on the landing 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'/docs':222 '/pricing':223 '/readme':224 '/request':12,30,173 '0.02':11,29,93,172 '000':87 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':209 '20':86 '6':99 'Base network API' 'USDC micropayment API' 'accept':69,214 'access':48,67 'across':131 'address':205 'advertis':129 'ai':141 'analysi':145 'analyt':135 'api':6,16,24,34,46,66,102 'application/json':219 'attach':113 'base':8,26,56,73,88,211 'broader':126 'call':4,22 'caller':111 'categori':133 'challeng':76 'charg':83 'classif':148 'collect':40 'commit':108 'confirm':77 'connect':228 'content':234 'convers':164 'correspond':183 'crawl':236 'crypto-paid API' 'data':134,138 'decim':100 'document':220 'embed':149 'endpoint':47,60,79,130,168,178,189,213 'estim':159 'exact':198 'exchang':154 'export':139 'feed':153 'financ':150 'four':132 'function':199 'gas':158 'generat':165 'geocod':162 'header':118 'host':38 'howev':175 'i.e':92 'infrastructur':161 'insight':140 'json-api' 'key':17,35,103 'land':194 'learn':143 'limit':105 'list':63,167 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,127 'machin':142 'metric':136 'name':188 'network':57 'no-api-key' 'page':195,221 'particular':177 'path':179 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,117,123,202 'per':3,21,44,94 'platform':128 'post':215 'post-method' 'premium':5,23,65 'premium endpoint' 'price':152,174 'prompt':230 'proof':124 'protocol':53 'quot':157 'rate':104,155 'report':137 'request':45,95,216 'requir':18,36,110 'return':218,225 'sentiment':144 'settl':203 'share':169 'simpli':112 'sinc':96 'site':192 'specif':59 'substant':233 'summar':147 'text':146 'token':156 'unclear':201 'unit':89 'upfront':107 'usdc':14,32,70,91,97,208 'usdc-base' 'use':98,207 'valid':121,163 'via':9,27,49 'wallet':229 'web3':151 'x':116 'x-payment':115 'x402':10,28,51,75,122 'x402 API' 'x402-payment'","prices":[{"id":"e81ed563-5b12-4604-8880-a43f17482a9e","listingId":"0b0abb42-d4ef-431d-b33d-ffff8b0e0bef","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-15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:20.936Z"}],"sources":[{"listingId":"0b0abb42-d4ef-431d-b33d-ffff8b0e0bef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:20.936Z","lastSeenAt":"2026-04-22T13:30:23.077Z"}],"details":{"listingId":"0b0abb42-d4ef-431d-b33d-ffff8b0e0bef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/endpoint-15","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/endpoint-15"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API consumption with automatic per-call USDC micropayments","Accessing premium data or services without managing API keys or subscriptions","Programmatic pay-as-you-go access to utility endpoints on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-cost micropayment experimentation ($0.02/call)"],"notFor":["Users needing detailed documentation or guaranteed SLAs — docs are essentially empty","Anyone requiring a known, well-defined API contract — the exact functionality of /api/endpoint-15 is undocumented"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:51:35.778Z"},"updatedAt":"2026-04-22T13:30:23.077Z"}}