{"id":"5e97bfbf-082a-4a5e-8d6a-99f6242c7291","shortId":"d2eY5p","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/24` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 example payloads available. The specific functionality behind `/api/v1/trades/24` is unclear beyond its generic \"Premium API Access\" label. Without documentation or example responses, it is difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-request API","x402 endpoint","USDC API","Base network API","trades API","low fee API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only a wallet-connect prompt","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/trades/24 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/24","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/trades/24","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 402 challenge, confirming it is operational. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of /api/v1/trades/24 specifically is unclear beyond its generic 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'/api/v1/trades/24':66,210 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34,167 '0.02':16,33,94,166 '000':86 '0x8335':91 '20':85 '6':99 'Base network API' 'USDC API' 'accept':74 'access':45,72,218 'advertis':80,121 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,41,71,111,217 'avail':205 'base':7,24,61,87 'base-network' 'behind':51,209 'beyond':213 'broader':119 'categori':123 'challeng':79 'classif':140 'connect':185 'content':191 'convers':157 'cost':83 'data':9,26,126,130,231 'decim':100 'determin':229 'difficult':227 'document':170,200,221 'embed':141 'endpoint':14,31,50,65,125,160,236 'equal':93 'estim':151 'exact':107 'exampl':203,223 'exchang':146 'export':131 'extrem':172 'feed':145 'financ':11,28,142 'four':122 'function':208 'gas':150 'gate':3,20,44 'generat':158 'generic':215 'geocod':155 'infrastructur':153 'insight':132 'json-response' 'key':112 'label':219 'learn':135 'limit':114 'list':68,162 'low fee API' 'lowpaymentfee.com':35 'machin':134 'made':103 'marketplac':42 'maximum':82 'metric':128 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':195 'page':180 'particular':235 'pay-per-request API' 'payload':204 'payment':101 'per':53,95 'per-request':52 'per-request-billing' 'platform':5,22,120 'point':169 'post':75 'post-endpoint' 'premium':70,216 'price':144,168 'prompt':187 'protocol':40 'quot':149 'rate':113,147 'render':182 'report':129 'request':54,76,96 'request/response':198 'requir':117 'respons':224 'return':237 'schema':199 'scheme':108 'sentiment':136 'servic':233 'settl':56 'spars':173 'spec':196 'specif':64,207 'subscript':116 'summar':139 'text':138 'token':148 'trades API' 'unclear':212 'unit':88 'usdc':58,90,97 'usdc-micropayment' 'use':98 'util':13,30,154 'valid':156 'varieti':48 'via':104 'wallet':186 'web3':143 'without':220 'x402':2,19,39,78,106 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9d6942b4-1573-4a76-9011-cc832fdf6fdf","listingId":"5e97bfbf-082a-4a5e-8d6a-99f6242c7291","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/trades/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:50.903Z"}],"sources":[{"listingId":"5e97bfbf-082a-4a5e-8d6a-99f6242c7291","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:50.903Z","lastSeenAt":"2026-04-26T04:03:40.867Z"}],"details":{"listingId":"5e97bfbf-082a-4a5e-8d6a-99f6242c7291","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/24 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/24"},{"claim":"All endpoints are listed at $0.02/request 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, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or executing trade-related queries via a single micropayment","Integrating pay-per-call API access into agent workflows without managing API keys","Programmatic access to premium data behind x402 payment gates"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.681Z"},"updatedAt":"2026-04-26T04:03:40.867Z"}}