{"id":"4f0e05a8-6712-4197-adf8-3cdc2151137f","shortId":"t4rzHn","kind":"x402","title":"x402-payable API platform on Base network with data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base network with data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints use the x402 payment protocol on the Base network, accepting USDC (USD Coin) for per-request payment with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/item/15` is listed as \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The site's homepage lists numerous other endpoints (analytics, AI inference, crypto quotes, geocoding, etc.) all priced at $0.02 per request. This particular endpoint's x402 challenge specifies a maxAmountRequired of 20000 (in the asset's smallest unit — likely 0.02 USDC given 6 decimals), consistent with the site's uniform pricing.\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 description of what `/api/v1/item/15` actually returns. The endpoint is live and responds with a valid 402 challenge, but without documentation it is unclear what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-request-pricing","no-api-key","http-post"],"categories":["api-platform","x402"],"synonyms":["low payment fee","x402 api","pay-per-request api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet'","The specific functionality of /api/v1/item/15 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples available","Cannot verify what data or service this endpoint provides without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/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/v1/item/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 with a valid 402 challenge and consistent pricing, but there is zero documentation on what /api/v1/item/15 actually does. No OpenAPI schema, no request/response examples, and all doc pages return only 'Connect wallet'. The listing is effectively a 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'/api/v1/item/15':98,203 '/docs':173 '/pricing':175 '/readme':177 '/request':18,36 '0.02':17,35,135,156 '20000':148 '402':215 '6':159 'accept':75 'access':104 'across':51 'actual':204 'ai':11,29,56,126 'analyt':55,125 'api':4,22,43,86,103 'asset':151 'avail':114 'base':7,25,73 'base network api' 'base-network' 'categori':53 'challeng':143,216 'coin':78 'commit':93 'connect':183 'consist':161 'content':189 'crawl':115 'crypto':128 'data':10,28,54,224 'decim':160 'descript':200 'document':111,168,219 'enabl':42 'endpoint':15,33,50,65,97,124,140,207 'etc':131 'exact':107 'exampl':197 'extrem':170 'financ':12,30,59 'four':52 'function':108 'geocod':130 'given':158 'homepag':120 'http-post' 'infer':127 'infrastructur':62 'key':87 'learn':58 'like':155 'limit':90 'list':100,121 'live':209 'low payment fee' 'lowpaymentfee.com':37 'machin':57 'materi':116 'maxamountrequir':146 'micropayment api' 'network':8,26,74 'no-api-key' 'numer':122 'offer':46 'openapi':193 'page':178 'particular':139 'pay-per-request api' 'payabl':3,21 'payment':69,83 'per':81,136 'per-request':80 'per-request-pricing' 'platform':5,23,44 'premium':102 'premium api access' 'price':133,167 'prompt':185 'protocol':70 'provid':228 'quot':129 'rate':89 'request':82,137 'request/response':196 'requir':94 'respond':211 'return':180,205 'schema':194 'servic':226 'site':118,164 'smallest':153 'spars':171 'specif':96 'specifi':144 'substant':188 'unclear':222 'uniform':166 'unit':154 'usd':77 'usdc':76,157 'usdc api' 'usdc-payment' 'use':66 'util':14,32,63 'valid':214 'varieti':48 'wallet':184 'web3':60 'without':218 'x402':2,20,41,68,142 'x402 api' 'x402-enabled':40 'x402-payable':1,19 'x402-payment'","prices":[{"id":"40660810-6244-4fac-9a9a-7c58e2b69042","listingId":"4f0e05a8-6712-4197-adf8-3cdc2151137f","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/item/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":"2026-04-18T18:31:53.029Z"}],"sources":[{"listingId":"4f0e05a8-6712-4197-adf8-3cdc2151137f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:53.029Z","lastSeenAt":"2026-04-25T07:31:50.809Z"}],"details":{"listingId":"4f0e05a8-6712-4197-adf8-3cdc2151137f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a valid 402 challenge with maxAmountRequired 20000, USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/15"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402 payment-gated endpoints into agent workflows","Accessing various data, AI, finance, or utility services via a single payment platform"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-use API access","x402-compatible agents on the Base network with USDC","Prototyping integrations without signup or rate-limit concerns"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request pricing at $0.02 may be expensive","Anyone who needs to know exactly what /api/v1/item/15 returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.499Z"},"updatedAt":"2026-04-25T07:31:50.809Z"}}