{"id":"dea06853-0cdf-491e-9e30-04215bc963fc","shortId":"pkMqnR","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/141` is listed as \"Premium API Access\" and returns a live 402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers 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 endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nNote that this specific endpoint (`/api/v1/payments/141`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API listing. Its actual functionality beyond the payment gate is unclear — there is no OpenAPI schema, no documented request/response format, and the crawled docs pages returned only a wallet-connect prompt with no substantive content. Treat this endpoint with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment protocol","crypto API access"],"warnings":["Endpoint /api/v1/payments/141 is not listed among the site's publicly documented APIs — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub with no substantive content.","The generic label 'Premium API Access' provides no indication of what data or service is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/141","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/payments/141","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). However, there is no OpenAPI schema, no documented request/response format, and the endpoint path (/api/v1/payments/141) doesn't match any publicly listed API on the site. Docs pages returned only wallet-connect stubs with no content. Functionality is essentially 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'/request':12,28 '0.02':11,27,82,158 '000':76 '20':75 '402':70 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':48 'access':65,96,179 'across':117 'actual':192 'advertis':87 'ai':127 'analysi':131 'analyt':121 'api':5,14,21,30,40,64,89,178,189 'appear':183 'attach':99 'base':8,24,53,77,166 'beyond':194 'broader':112 'call':4,20,84 'caller':97 'categori':119 'caution':229 'challeng':71 'classif':134 'connect':219 'content':224 'convers':151 'crawl':211 'crypto API access' 'data':120,124 'doc':212 'document':206,232 'embed':135 'endpoint':57,116,154,171,227 'estim':145 'exchang':140 'export':125 'feed':139 'financ':136 'format':208 'four':118 'function':193 'gas':144 'gate':197 'generat':152 'generic':175 'geocod':149 'header':104 'http-post' 'i.e':81 'infrastructur':147 'insight':126 'instant':95 'key':15,31,90 'label':174 'learn':129 'limit':93 'list':61,190 'live':69 'lowpaymentfee' 'lowpaymentfee.com':33,113 'machin':128 'metric':122 'network':54 'no-api-key' 'note':167 'offer':115 'openapi':203 'page':213 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,103,109,196 'per':3,19,38,83,159 'platform':6,22,41,86,114 'premium':63,177 'price':138,156 'prompt':220 'proof':110 'protocol':46 'public':188 'quot':143 'rate':92,141 'report':123 'request':39,160 'request/response':207 'requir':16,32,72 'return':67,214 'schema':204 'sentiment':130 'settl':162 'simpli':98 'site':186 'specif':56,170 'substant':223 'summar':133 'surfac':233 'text':132 'token':142 'treat':225 'unclear':199 'unit':78 'usdc':49,80,164 'usdc-base' 'use':43 'util':148 'valid':107,150 'via':9,25 'wallet':218 'wallet-connect':217 'web3':137 'x':102 'x-payment':101 'x402':10,26,45,108 'x402 API' 'x402-payment'","prices":[{"id":"c247fe62-eb08-4db9-a764-de204ff53fd8","listingId":"dea06853-0cdf-491e-9e30-04215bc963fc","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/payments/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.741Z"}],"sources":[{"listingId":"dea06853-0cdf-491e-9e30-04215bc963fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.741Z","lastSeenAt":"2026-04-23T16:07:16.174Z"}],"details":{"listingId":"dea06853-0cdf-491e-9e30-04215bc963fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/141 \\\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 live 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/141"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/141"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to gated endpoints without subscription or signup"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.053Z"},"updatedAt":"2026-04-23T16:07:16.174Z"}}