{"id":"b6fbb121-d209-446a-99d6-10641ab570d6","shortId":"27RS6V","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/22` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum payment 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 or rate limits 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 schema, no request/response examples, and no detailed documentation for any endpoint, including the `/api/v1/trades/22` endpoint being listed here. The specific purpose of the \"trades/22\" endpoint is unclear from available materials; it does not appear in the site's main endpoint listing, so its functionality must be considered unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["premium API access","trades API","x402 micropayment API","pay-per-request API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The /api/v1/trades/22 endpoint does not appear in the site's listed API catalog, making its purpose unclear","No examples of expected request body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/22 is not described anywhere on the site. The docs pages are empty beyond a wallet connect 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'/request':17,34,166 '0.02':16,33,94,165 '000':86 '0x8335':91 '20':85 '6':99 'Base USDC API' 'accept':74 'access':44,72 'advertis':120 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,40,71,111,175 'appear':228 'avail':223 'base':7,24,60,87 'behind':50 'broader':118 'categori':122 'challeng':79 'classif':139 'connect':184 'consid':241 'content':190 'convers':156 'data':9,26,125,129 'decim':100 'detail':201 'doc':174 'document':169,202 'embed':140 'endpoint':14,31,49,64,124,159,205,209,219,234 'equal':93 'estim':150 'exact':107 'exampl':198 'exchang':145 'export':130 'extrem':171 'feed':144 'financ':11,28,141 'four':121 'function':238 'gas':149 'gate':3,20,43 'generat':157 'geocod':154 'includ':206 'indic':80 'infrastructur':152 'insight':131 'json-response' 'key':112 'learn':134 'limit':115 'list':68,161,211,235 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'made':103 'main':233 'marketplac':41 'materi':224 'maximum':82 'metric':127 'micropay':54 'must':239 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':194 'page':179 'pay-per-request API' 'payment':83,101 'per':52,95 'per-request':51 'per-request-micropayment' 'platform':5,22,119 'point':168 'post':75 'post-endpoint' 'premium':70 'premium API access' 'price':143,167,176 'prompt':186 'protocol':39 'purpos':215 'quot':148 'rate':114,146 'readm':178 'render':181 'report':128 'request':53,76,96 'request/response':197 'requir':116 'schema':195 'scheme':108 'sentiment':135 'settl':55 'site':231 'spars':172 'specif':63,214 'summar':138 'text':137 'token':147 'trades API' 'trades/22':218 'unclear':221 'unit':88 'unknown':242 'usdc':57,90,97 'usdc-base' 'use':98 'util':13,30,153 'valid':155 'varieti':47 'via':104 'wallet':185 'web3':142 'x402':2,19,38,78,106 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"700b66b8-1b15-4207-a425-525396d389d3","listingId":"b6fbb121-d209-446a-99d6-10641ab570d6","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:47.384Z"}],"sources":[{"listingId":"b6fbb121-d209-446a-99d6-10641ab570d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:47.384Z","lastSeenAt":"2026-04-26T05:32:45.942Z"}],"details":{"listingId":"b6fbb121-d209-446a-99d6-10641ab570d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/22 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/22"},{"claim":"All listed endpoints are priced 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 in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data via a single micropayment without subscription","Agent-driven API consumption with per-call USDC payments on Base","Programmatic access to premium data without API key management"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing 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":"2026-02-17T23:13:45.843Z"},"updatedAt":"2026-04-26T05:32:45.942Z"}}