{"id":"bc8b91ec-9405-4fbf-bdcf-94a3d79432f2","shortId":"VBazXs","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/33` is labeled \"Premium API Access\" and returns a 402 challenge requesting 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 — you simply attach an x402 payment header to each request.\n\nThe broader 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 listed at $0.02 per request.\n\nThis particular endpoint (`/api/v1/payments/33`) does not have detailed documentation beyond its title \"Premium API Access.\" The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further content, so the actual request/response schema for this endpoint is unknown. The endpoint is confirmed live via a valid 402 challenge, but what data or functionality it returns after payment remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for what /api/v1/payments/33 actually returns after payment","All doc/pricing/API pages on the site render only 'Connect wallet' with no content","No OpenAPI spec, no request schema, and no response schema available","The endpoint name 'Premium API Access' is generic and does not describe its functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for what this specific endpoint returns, no request/response schema, and the site's docs/pricing/API pages are all empty beyond a wallet-connect prompt. The listing is essentially a stub with confirmed 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66,205 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,166 'across':108 'actual':189 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,165,171 'attach':95 'base':8,23,51,73 'beyond':161 'broader':104 'call':4,19,80 'categori':110 'challeng':67,206 'classif':125 'confirm':200 'connect':180 'content':186 'convers':142 'crypto-paid API' 'data':111,115,209 'detail':159 'doc':168 'document':160 'embed':126 'endpoint':55,107,145,154,194,198 'estim':136 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':211 'gas':135 'generat':143 'geocod':140 'header':99 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':59 'learn':120 'limit':89 'list':147 'live':201 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'page':172 'particular':153 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98,215 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,164 'premium API access' 'price':129,169 'prompt':182 'protocol':44 'quot':134 'rate':88,132 'remain':216 'render':177 'report':114 'request':37,68,102,151 'request/response':190 'return':64,213 'schema':191 'sentiment':121 'simpli':94 'site':175 'specif':54 'summar':124 'text':123 'titl':163 'token':133 'unclear':217 'unit':74 'unknown':196 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,204 'via':10,25,202 'wallet':181 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"3868d42a-09d6-4f40-a7e5-4f32a94122ae","listingId":"bc8b91ec-9405-4fbf-bdcf-94a3d79432f2","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:23.545Z"}],"sources":[{"listingId":"bc8b91ec-9405-4fbf-bdcf-94a3d79432f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:23.545Z","lastSeenAt":"2026-04-23T23:02:46.037Z"}],"details":{"listingId":"bc8b91ec-9405-4fbf-bdcf-94a3d79432f2","quickStartSnippet":"# This endpoint requires an x402 payment header.\n# 1. POST to the endpoint without payment to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/33\n# 2. Use an x402-compatible client to attach the payment header\n#    and re-send the request to access the premium content.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/33"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/33"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","Anyone without USDC on Base network","Use cases requiring high-volume batch processing where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.181Z"},"updatedAt":"2026-04-23T23:02:46.037Z"}}