{"id":"dcba0ea2-7ae0-46e7-88ad-ad6c16dc209e","shortId":"eTNte9","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/generate/resource/25` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints, which include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export.\n\nDocumentation 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 from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body this particular resource expects or what it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","no-api-key","no-rate-limits"],"categories":["infrastructure","general"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The purpose and expected input/output of /api/v1/generate/resource/25 is unknown","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/25","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/25","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 with clear pricing, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. It is impossible to determine what this specific resource does beyond its title 'Premium API 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'/api/v1/generate/resource/25':96 '/docs':170 '/pricing':171 '/readme':174 '/request':19,38,141 '0.02':18,37,127,140 '000':116 '0x8335':121 '20':115 '2913':122 '402':213 '6':132 'Base network API' 'USDC micropayment API' 'accept':104 'access':102 'across':143 'advertis':137 'ai':12,31,57 'analysi':150 'analyt':56 'api':5,24,45,83,101 'avail':200 'base':8,27,76,117,124 'bodi':223 'broad':50 'broader':135 'call':4,23,129 'challeng':109,214 'classif':153 'collect':51 'confirm':208 'connect':180 'content':186 'convers':161 'cost':113 'cover':10,29 'crawl':203 'crypto-paid API' 'data':11,30,55,163 'decim':133 'document':165,195,217 'embed':154 'enabl':44 'endpoint':16,35,53,66,94,146,206 'equal':126 'exampl':199 'exchang':157 'expect':227 'export':164 'extrem':167 'feed':156 'financ':13,32,60 'geocod':159 'includ':148 'indic':110 'infrastructur':63 'key':84 'learn':59 'limit':87 'list':98 'live':209 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'materi':204 'maximum':112 'network':77 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':190 'page':175 'paid':68 'particular':225 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,128 'per-request':69 'per-request-billing' 'platform':46,136 'post':105 'post-endpoint' 'premium':100 'price':142,155 'prompt':182 'proper':212 'protocol':81 'rate':86,158 'render':177 'request':71,106,222 'request/response':193 'requir':91 'resourc':226 'return':210,231 'schema':194 'sentiment':149 'span':54 'spars':168 'spec':191 'specif':93 'subscript':90 'suit':6,25 'summar':152 'text':151 'unclear':220 'uniform':139 'unit':118 'usag':198 'usdc':9,28,73,120,130 'usdc-base' 'use':72,131 'util':15,34,64 'valid':160 'via':78 'wallet':181 'web3':61 'without':216 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a104a0bb-bf0e-49d5-bb81-cad52e5a9a07","listingId":"dcba0ea2-7ae0-46e7-88ad-ad6c16dc209e","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:43.914Z"}],"sources":[{"listingId":"dcba0ea2-7ae0-46e7-88ad-ad6c16dc209e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:43.914Z","lastSeenAt":"2026-04-22T13:30:31.871Z"}],"details":{"listingId":"dcba0ea2-7ae0-46e7-88ad-ad6c16dc209e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/25 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/25"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing utility or generation endpoints without needing API key registration","Paying per-request with USDC on Base for lightweight API calls","Integrating x402-compatible agents with a low-cost general-purpose API"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","x402-compatible AI agents that need cheap utility endpoints","Prototyping workflows that require on-demand API calls settled in crypto"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production systems requiring well-documented request/response schemas","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.993Z"},"updatedAt":"2026-04-22T13:30:31.871Z"}}