{"id":"0169f728-59d4-483f-b90b-981c9339c148","shortId":"Cs9ATB","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 at `/api/v1/trades/58` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals — consistent with the site's advertised flat pricing of $0.02 per request.\n\nThe broader platform organizes its APIs into 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 listed at the same $0.02 price point.\n\nThe specific `/api/v1/trades/58` endpoint's purpose is not well-documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt. There are no API keys or rate limits; access is purely pay-per-call via the x402 payment header. The endpoint is live and returning a valid 402 challenge.","tags":[],"capabilities":["x402-payment","per-request-micropayment","usdc-base-network","post-endpoint","no-api-key","no-rate-limits","pay-per-use"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","trades API","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific function of /api/v1/trades/58 is undocumented — 'Premium API Access' is generic","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content","Request body format and response structure are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/58","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/58","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 with clear pricing. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The purpose of /api/v1/trades/58 specifically is unclear, and all doc pages returned only 'Connect wallet' with no useful 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'/request':17,34 '0.02':16,33,94,109,160 '000':86 '0x8335':91 '20':85 '402':232 '6':98 'Base network API' 'USDC pay-per-call' 'accept':75 'access':45,73,179,212 'advertis':81,105 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,72,117,178,195,207 'base':7,24,61,87 'behind':51 'beyond':174 'broader':113 'call':218 'categori':120 'challeng':80,233 'classif':135 'connect':201 'consist':100 'convers':151 'data':9,26,121,125 'decim':99 'detail':187 'doc':192 'document':173,188 'embed':136 'endpoint':14,31,50,65,154,166,225 'equal':93 'estim':146 'exampl':185 'exchang':141 'export':126 'feed':140 'financ':11,28,137 'flat':106 'found':190 'four':119 'gas':145 'gate':3,20,44 'generat':152 'generic':176 'geocod':149 'given':95 'header':223 'infrastructure/utilities':148 'insight':127 'key':208 'label':180 'learn':130 'limit':211 'list':69,156 'live':227 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'marketplac':42 'maxamountrequir':83 'metric':123 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limits' 'offer':8,25 'openapi':182 'organ':115 'page':196 'pay':216 'pay-per-cal':215 'pay-per-use' 'payment':222 'per':53,110,217 'per-request':52 'per-request-micropayment' 'platform':5,22,114 'point':162 'post':76 'post-endpoint' 'premium':71,177 'premium API access' 'price':107,139,161,193 'prompt':203 'protocol':40 'pure':214 'purpos':168 'quot':144 'rate':142,210 'report':124 'request':54,77,111 'request/response':184 'return':198,229 'schema':183 'sentiment':131 'settl':56 'site':103 'specif':64,164 'summar':134 'text':133 'token':143 'trades API' 'unit':88 'usdc':58,90,96 'usdc-base-network' 'util':13,30 'valid':150,231 'varieti':48 'via':219 'wallet':202 'web3':138 'well':172 'well-docu':171 'x402':2,19,39,79,221 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"eef35a67-a643-4589-af4a-2e4e7e696c5b","listingId":"0169f728-59d4-483f-b90b-981c9339c148","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:01.012Z"}],"sources":[{"listingId":"0169f728-59d4-483f-b90b-981c9339c148","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:01.012Z","lastSeenAt":"2026-04-26T02:03:12.075Z"}],"details":{"listingId":"0169f728-59d4-483f-b90b-981c9339c148","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/58 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/58"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/58"}],"useCases":["Accessing trade data or executing trade-related queries via a single paid API call","Integrating pay-per-request APIs into agent workflows without managing API keys","Programmatic access to financial or trade information settled on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 micropayments autonomously","Projects needing low-cost ($0.02) on-demand API calls without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","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":"2026-02-17T23:13:45.216Z"},"updatedAt":"2026-04-26T02:03:12.075Z"}}