{"id":"5206ddd7-8916-442b-a885-2a9d4c4844fc","shortId":"wcR5WQ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com is a platform offering a suite of x402-protocol pay-per-request APIs across multiple categories: data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each endpoint costs $0.02 per call, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/accounts/142` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and is discoverable.\n\nThe broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality of the `/api/v1/accounts/142` endpoint is not documented beyond its title \"Premium API Access,\" so the exact data it returns is unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-response","no-api-key","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["pay-per-request API","x402 API","micropayment API","USDC API access","Base network API","low fee API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/accounts/142 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides.","Documentation pages (/docs, /pricing, /api, /README) returned no meaningful content beyond 'Connect wallet'.","No OpenAPI specification or response schema is available.","The broader platform lists many endpoints but none have detailed documentation in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/142","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/accounts/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's purpose and response schema are entirely undocumented. The crawled docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful content. No OpenAPI spec, no example requests or responses, and no description of what /api/v1/accounts/142 actually 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'/request':188 '0.02':10,28,69,133,187 '000':122 '0x8335':127 '20':121 '2913':128 '300':146 '6':137 'Base network API' 'USDC API access' 'accept':151 'access':6,24,109,207 'across':53 'advertis':116 'ai':58 'also':160 'amount':119 'analysi':165 'analyt':57 'api':5,17,23,35,52,80,108,206 'application/json':112 'attach':91 'base':8,26,77,123,130 'base-network' 'beyond':202 'broader':158 'call':71 'caller':89 'categori':55 'challeng':115 'classif':168 'commit':86 'convers':180 'cost':68 'crypto-paid API' 'data':56,211 'decim':138 'discover':156 'document':201 'embed':169 'endpoint':67,101,150,162,198 'equal':132 'estim':177 'exact':143,210 'exchang':172 'expos':161 'feed':171 'financ':61 'function':194 'gas':176 'gate':3,21 'generat':182 'geocod':178 'given':134 'header':95 'howev':191 'infrastructur':64 'json-response' 'key':18,36,81 'learn':60 'limit':83 'list':105 'low fee API' 'lowpaymentfee.com':37 'machin':59 'max':118 'micropayment API' 'multipl':54 'network':78 'no-api-key' 'offer':41 'pay':9,27,49 'pay-per-request':48 'pay-per-request API' 'payment':94,140 'per':11,29,50,70 'per-request-billing' 'platform':40,159 'point':190 'post':152 'post-method' 'premium':4,22,107,205 'price':170,189 'protocol':47 'quot':175 'rate':82,173 'request':12,30,51,98,153 'requir':88 'return':111,213 'scheme':141 'second':147 'sentiment':164 'settl':72 'simpli':90 'specif':100,193 'suit':43 'summar':167 'text':166 'timeout':148 'titl':204 'token':174 'unclear':215 'unit':124 'upfront':85 'usdc':14,32,74,126,135 'usdc-settlement' 'util':65 'valid':179 'web3':62 'x402':2,20,46,93,114 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':45","prices":[{"id":"d2e5d072-ef56-47a7-a894-419b697c7765","listingId":"5206ddd7-8916-442b-a885-2a9d4c4844fc","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/accounts/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:09.689Z"}],"sources":[{"listingId":"5206ddd7-8916-442b-a885-2a9d4c4844fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:09.689Z","lastSeenAt":"2026-04-23T07:30:58.361Z"}],"details":{"listingId":"5206ddd7-8916-442b-a885-2a9d4c4844fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/142 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (scheme: exact, timeout: 300s)","source_url":"https://lowpaymentfee.com/api/v1/accounts/142"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/142"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Paying for individual API calls with USDC on Base for cost-transparent workflows","Accessing a variety of data, AI, finance, and utility endpoints through a single payment protocol"],"bestFor":["Developers or agents wanting zero-setup, pay-as-you-go API access","x402-compatible clients that can attach payment headers automatically","Use cases requiring low per-call costs ($0.02) with no minimum spend"],"notFor":["Users who need detailed documentation or guaranteed SLAs for the accounts endpoint","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.067Z"},"updatedAt":"2026-04-23T07:30:58.361Z"}}