{"id":"5a17b992-2cbd-4d3e-a590-214c5787242d","shortId":"5dc3Ph","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/62` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page lists four categories of endpoints: 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 are priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/62` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides or how it differs from the other listed endpoints.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","pay-per-use","no-api-key","http-post"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","pay per request api","base network api","usdc api access","micropayment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet'","No OpenAPI or output schema describing what the endpoint returns","The purpose of '/api/v1/charges/62' ('Premium API Access') is unclear and may differ from the other listed endpoints","Cannot verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/62","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/charges/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is a 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'/api/v1/charges/62':57,197 '/docs':165 '/pricing':167 '/readme':169 '/request':16,32 '0.02':15,31,86,135 '000':77 '20':76 '402':208 '6':82 'accept':64 'access':62,149,222 'actual':199 'advertis':72,140 'ai':9,25,106 'analysi':110 'analyt':8,24,100 'api':4,20,42,61,142,221 'attach':152 'base':7,23,51,68,78 'base network api' 'caller':150 'categori':96 'challeng':71,209 'classif':113 'collect':36 'connect':175 'content':181 'convers':129 'data':99,103,217 'decim':83 'descript':193 'detail':192 'differ':227 'document':160,212 'embed':114 'endpoint':13,29,43,55,98,198,202,232 'equal':85 'estim':124 'exampl':189 'exchang':119 'export':104 'extrem':162 'feed':118 'financ':10,26,115 'four':95 'function':219 'gas':123 'gate':3,19,44 'generat':130 'geocod':127 'header':156 'http-post' 'infrastructur':126 'insight':105 'instant':148 'key':143 'label':59 'land':92 'learn':108 'limit':146 'list':94,231 'live':204 'low payment fee' 'lowpaymentfee.com':33 'machin':107 'maxamountrequir':74 'metric':101 'micropayment api' 'network':52 'no-api-key' 'offer':34 'openapi':185 'page':93,170 'pay':39 'pay per request api' 'pay-per-request':38 'pay-per-use' 'payment':66,155 'per':40,87,136 'per-request-billing' 'platform':139 'premium':60,220 'price':117,133 'prompt':177 'protocol':48 'provid':90,223 'quot':122 'rate':120,145 'report':102 'request':41,88,137,159 'request/response':188 'return':172,200,205 'schema':186 'sentiment':109 'simpli':151 'spars':163 'specif':54 'substant':180 'suit':5,21 'summar':112 'text':111 'token':121 'unclear':215 'unit':79 'usdc':65,81 'usdc api access' 'usdc-base' 'util':12,28 'valid':128,207 'wallet':176 'web3':116 'without':211 'x402':2,18,47,70,154 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"c64ca13b-1e98-4055-b9ae-c49ef430368e","listingId":"5a17b992-2cbd-4d3e-a590-214c5787242d","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/charges/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:39.235Z"}],"sources":[{"listingId":"5a17b992-2cbd-4d3e-a590-214c5787242d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:39.235Z","lastSeenAt":"2026-04-22T07:00:55.666Z"}],"details":{"listingId":"5a17b992-2cbd-4d3e-a590-214c5787242d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/62 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/62"},{"claim":"The landing page lists 16 API endpoints across four categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/62"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-volume callers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up without volume discounts","Anyone needing clarity on exactly what data the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.878Z"},"updatedAt":"2026-04-22T07:00:55.666Z"}}