{"id":"c2df0435-6221-410f-8a75-a8fe47f4528e","shortId":"EFht4L","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 USDC micropayments on the Base network. The platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/trades/82` is listed as \"Premium API Access\" and returns a valid x402 402 challenge. Its payment challenge specifies a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is settled on-chain via the x402 \"exact\" scheme to the payTo address. The endpoint accepts POST requests and returns application/json.\n\nNote that while the landing page lists many endpoint categories, the crawled documentation, pricing, and other subpages returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual functionality behind `/api/v1/trades/82` is unclear — the name \"trades\" and ID \"82\" suggest it may return trade data, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-endpoint"],"categories":["finance","data","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","trades API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose and expected input/output of /api/v1/trades/82 is not documented anywhere in the crawl","Documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no technical content","Cannot verify what data or functionality this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/82","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/82","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/trades/82 is undocumented. The docs, pricing, and README pages all render only a wallet-connect prompt with no useful 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'/request':17,34 '0.02':16,33,106,159 '000':146 '0x8335':151 '20':145 '2913':152 '402':136 '6':155 '82':236 'Base network API' 'USDC API' 'accept':177 'access':45,130 'actual':225 'addit':208 'address':174 'advertis':63 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,111,129 'application/json':182 'avail':223 'base':7,24,59,147,154 'base-network' 'behind':51,227 'categori':65,192 'chain':165 'challeng':137,140 'classif':82 'commit':119 'connect':203 'convers':99 'crawl':194 'crypto payment API' 'data':9,26,68,72,242 'decim':156 'detail':210 'document':195,219,247 'embed':83 'endpoint':14,31,50,102,123,176,191 'equal':158 'estim':93 'exact':169 'exampl':222 'exchang':88 'export':73 'feed':87 'financ':11,28,84 'four':64 'function':226 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'id':235 'infrastructur':95 'insight':74 'json-response' 'key':112 'land':187 'learn':77 'limit':115 'list':126,189 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'mani':190 'marketplac':42 'maxamountrequir':143 'may':239 'metric':70 'micropay':56 'micropayment API' 'minimum':118 'name':232 'network':60 'no-api-key' 'note':183 'offer':8,25 'on-chain':163 'openapi':214 'page':188 'pay-per-request API' 'payment':139,160 'payto':173 'per':53,107 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':178 'post-endpoint' 'premium':128 'price':86,104,196 'prompt':205 'protocol':40 'quot':91 'rate':89,114 'report':71 'request':54,108,179 'request/response':217 'requir':120 'return':132,181,200,240 'schema':218 'scheme':170 'sentiment':78 'settl':162 'spec':215 'specif':122 'specifi':141 'subpag':199 'suggest':237 'summar':81 'technic':209 'text':80 'token':90 'trade':233,241 'trades API' 'unclear':230 'unit':148 'usdc':55,150 'usdc-micropayment' 'util':13,30,96 'valid':98,134 'varieti':48 'via':166 'wallet':204 'web3':85 'x402':2,19,39,135,168 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"a4aac9a0-0201-4ae0-b1a6-3ecb87eeeaec","listingId":"c2df0435-6221-410f-8a75-a8fe47f4528e","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:59.261Z"}],"sources":[{"listingId":"c2df0435-6221-410f-8a75-a8fe47f4528e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:59.261Z","lastSeenAt":"2026-04-22T17:02:10.054Z"}],"details":{"listingId":"c2df0435-6221-410f-8a75-a8fe47f4528e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/82 \\\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 platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/82"}],"useCases":["Accessing trade data behind a per-call micropayment without needing an API key","Programmatic agents purchasing API responses on-the-fly using x402 USDC payments","Integrating low-cost, keyless API access into automated workflows on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs 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":"2026-02-17T23:13:45.264Z"},"updatedAt":"2026-04-22T17:02:10.054Z"}}