{"id":"dbfdf613-b7d3-47a7-a6fb-88126202f6e8","shortId":"EGYZKR","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/158` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). Payment is made via the `exact` scheme to the specified wallet address. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the \"Premium API Access\" label for resource 158 is not described anywhere in the crawled material, making it unclear what this specific endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/generate/resource/158 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/158","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/generate/resource/158","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 challenge, but there is zero documentation on what this specific resource (158) actually does. No OpenAPI spec, no request/response schemas, and all doc pages render only 'Connect wallet'. The purpose of 'Premium API Access' is entirely 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'/api/v1/generate/resource/158':118 '/docs':179 '/pricing':180 '/readme':183 '/request':17,34 '0.02':16,33,90,142 '000':136 '158':221 '20':135 '6':146 'Base network API' 'USDC API' 'accept':162 'access':124,217 'across':50 'actual':211 'address':159 'ai':10,27,59 'analysi':63 'analyt':54 'anywher':225 'api':4,21,41,105,123,216 'application/json':168 'avail':209 'base':7,24,98,137 'behind':213 'beyond':171 'broad':46 'catalog':47 'categori':52 'challeng':130 'classif':66 'commit':113 'connect':189 'content':195 'convers':83 'crawl':228 'data':9,26,53 'decim':147 'describ':224 'document':170,204 'embed':67 'enabl':40 'endpoint':14,31,49,86,116,161,236 'estim':77 'exact':153 'exampl':208 'exchang':72 'export':57 'expos':44 'extrem':176 'feed':71 'financ':11,28,68 'four':51 'function':212 'gas':76 'generat':84 'geocod':81 'given':143 'http':163 'http-post' 'i.e':141 'infrastructur':79 'insight':58 'json-response' 'key':106 'label':218 'land':173 'learn':61 'limit':109 'list':120 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':60 'made':150 'make':230 'materi':229 'maxamountrequir':133 'metric':55 'micropayment API' 'network':99 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':199 'page':174,184 'pay-per-call API' 'payabl':3,20,93 'payment':148 'per':91 'per-request-pricing' 'platform':5,22,42 'post':164 'premium':122,215 'price':70,88 'prompt':191 'protocol':103 'quot':75 'rate':73,108 'render':186 'report':56 'request':92,165 'request/response':202 'resourc':220 'respons':169 'return':126,167,237 'schema':203 'scheme':154 'sentiment':62 'spars':177 'spec':200 'specif':115,235 'specifi':157 'standard':128 'summar':65 'text':64 'token':74 'unclear':232 'unit':138 'upfront':112 'usag':207 'usdc':95,140,144 'usdc-base' 'util':13,30,80 'valid':82 'via':100,151 'wallet':158,190 'web3':69 'x402':2,19,39,102,129 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"199a473f-4f26-4316-b515-794588cb0de3","listingId":"dbfdf613-b7d3-47a7-a6fb-88126202f6e8","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/generate/resource/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:25.775Z"}],"sources":[{"listingId":"dbfdf613-b7d3-47a7-a6fb-88126202f6e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:25.775Z","lastSeenAt":"2026-04-25T00:03:33.578Z"}],"details":{"listingId":"dbfdf613-b7d3-47a7-a6fb-88126202f6e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/158","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-header>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for resource 158 shows maxAmountRequired of 20000 base units of USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/158"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven workflows that need pay-per-call access on Base via x402","Integrating low-cost API calls into crypto-native applications"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Projects needing simple micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with guaranteed SLAs","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.95Z"},"updatedAt":"2026-04-25T00:03:33.578Z"}}