{"id":"24e334f2-8940-40c8-98ad-fda08f289189","shortId":"zR4kcb","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/79` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no 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. However, the specific `/api/v1/trades/79` endpoint does not clearly map to any of the documented categories, and no detailed documentation, request/response schemas, or usage examples are available for it or any other endpoint on the site.\n\nThe endpoint is live and returns a valid x402 402 challenge. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout for payment settlement is 300 seconds. Because the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, the actual behavior and response format of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","premium-api-access","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api access","lowpaymentfee","trades api"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content.","The endpoint path `/api/v1/trades/79` does not appear in the site's listed API catalog, so its purpose is unclear.","No request body schema or response schema is documented anywhere.","No examples of successful responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/79","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/79","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 request/response schema, and no explanation of what `/api/v1/trades/79` actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,157 '0.02':16,33,78,156 '000':82 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':212 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':215 '20':81 '300':225 '402':204 '6':88 'access':45,73 'actual':248 'address':211 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,233 'avail':185 'base':7,24,61,83,217 'base network api' 'behavior':249 'behind':51 'broader':109 'call':80 'categori':113,174 'challeng':205 'classif':130 'clear':167 'connect':240 'content':246 'convers':147 'cost':75 'crawl':229 'data':9,26,116,120 'decim':89 'detail':177 'direct':209 'doc':232 'document':173,178,230 'embed':131 'endpoint':14,31,50,65,115,150,164,191,196,255 'estim':141 'exact':96 'exampl':183 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'format':252 'four':112 'gas':140 'gate':3,20,44 'generat':148 'geocod':145 'handl':92 'howev':160 'infrastructur':143 'insight':122 'key':100 'learn':125 'limit':103 'list':69,152 'live':198 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'map':168 'marketplac':42 'maximum':219 'metric':118 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':231 'pay-per-request api' 'payment':90,207,222 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':159 'premium':71 'premium-api-access' 'price':134,158,234 'prompt':242 'protocol':40 'quot':139 'rate':102,137 'readm':235 'remain':256 'report':119 'request':54 'request/response':179 'requir':107 'respons':251 'return':200,237 'schema':180 'scheme':97 'second':226 'sentiment':126 'settl':56 'settlement':223 'site':194 'specif':64,162 'subscript':106 'substant':245 'summar':129 'text':128 'timeout':220 'token':138 'trades api' 'unit':84 'unknown':257 'usag':182 'usdc':58,86,214 'usdc api access' 'usdc-base' 'use':213 'util':13,30,144 'valid':146,202 'varieti':48 'via':93 'wallet':241 'web3':133 'x402':2,19,39,95,203 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"83cd7d11-b8a4-4c63-ace9-24d53998adef","listingId":"24e334f2-8940-40c8-98ad-fda08f289189","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:59.233Z"}],"sources":[{"listingId":"24e334f2-8940-40c8-98ad-fda08f289189","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:59.233Z","lastSeenAt":"2026-04-22T17:02:10.052Z"}],"details":{"listingId":"24e334f2-8940-40c8-98ad-fda08f289189","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/79 \\\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 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/79"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/79"}],"useCases":["Accessing trade data or premium content behind a per-call micropayment wall","Programmatic agent-driven API consumption without pre-registration or API keys","Integrating pay-as-you-go endpoints into automated workflows on Base"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Scenarios requiring low-friction, no-commitment API usage"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.271Z"},"updatedAt":"2026-04-22T17:02:10.052Z"}}