{"id":"fce040df-fec0-4776-9813-2bbf58c65a65","shortId":"6uWwch","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 marketplace that exposes a broad set of 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 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/146` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USDC, i.e., $0.02). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind \"Premium API Access\" at resource/146 is unclear; it does not map to any of the named endpoints on the homepage. Agents should treat this as a live but under-documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content.","No OpenAPI or schema provided; request body format and response structure are unknown.","The endpoint path /api/v1/generate/resource/146 ('Premium API Access') does not match any of the named endpoints listed on the homepage — its actual functionality is unclear.","Cannot verify what this endpoint actually returns upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/146","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific resource/146 path doesn't correspond to any named endpoint on the homepage. Effectively a stub 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'/api/v1/generate/resource/146':119 '/docs':178 '/pricing':180 '/readme':182 '/request':17,34 '0.02':16,33,91,142,145 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '20':136 '402 payment api' 'accept':162 'access':125,216 'across':50 'actual':211 'addit':193 'address':153 'agent':234 'ai':10,27,60 'analysi':64 'analyt':54 'api':4,21,41,106,124,215 'application/json':168 'avail':209 'base':7,24,99,138 'base network api' 'behind':213 'beyond':170 'broad':46 'categori':52 'chain':151 'challeng':131 'classif':67 'commit':114 'connect':188 'convers':84 'data':9,26,53,57 'detail':195 'document':169,204,244 'embed':68 'enabl':40 'endpoint':14,31,49,87,117,161,230,245 'estim':78 'exact':157 'exampl':207 'exchang':73 'export':58 'expos':44 'extrem':175 'feed':72 'financ':11,28,69 'four':51 'function':212 'gas':77 'generat':85 'geocod':82 'homepag':233 'http':163 'http-post' 'i.e':144 'infrastructur':80 'insight':59 'json-api' 'key':107 'land':172 'learn':62 'limit':110 'list':121 'live':240 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'map':224 'marketplac':42 'maxamountrequir':134 'metric':55 'micropayment api' 'name':229 'network':100 'no-api-key' 'no-rate-limit' 'offer':8,25 'on-chain':149 'openapi':199 'page':173,183 'pay per call api' 'pay-per-request' 'payabl':3,20,94 'payload':208 'payment':146,158 'per':92 'platform':5,22 'post':164 'premium':123,214 'price':71,89 'prompt':190 'protocol':104 'quot':76 'rate':74,109 'render':185 'report':56 'request':93,165 'request/response':202 'resource/146':218 'return':127,167 'schema':203 'scheme':159 'sentiment':63 'set':47 'settl':148 'spars':176 'spec':200 'specif':116 'standard':129 'summar':66 'technic':194 'text':65 'token':75 'treat':236 'unclear':220 'under-docu':242 'unit':139 'upfront':113 'usdc':96,141,143 'usdc api' 'usdc-base' 'use':155 'util':13,30,81 'valid':83 'via':101 'wallet':189 'web3':70 'x402':2,19,39,103,130 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"166fa13d-2794-41b5-be52-a4d7d51b1414","listingId":"fce040df-fec0-4776-9813-2bbf58c65a65","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:30.967Z"}],"sources":[{"listingId":"fce040df-fec0-4776-9813-2bbf58c65a65","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:30.967Z","lastSeenAt":"2026-04-23T09:00:46.592Z"}],"details":{"listingId":"fce040df-fec0-4776-9813-2bbf58c65a65","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/146\n# Returns 402 with x402 challenge. Include X-PAYMENT header with a signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC (= $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/146"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/146"}],"useCases":["Programmatic access to utility or generation endpoints without API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-request microservices"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who want no subscription or minimum commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring predictable bulk pricing","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.711Z"},"updatedAt":"2026-04-23T09:00:46.592Z"}}