{"id":"72cfa562-75b8-432f-8a40-737049e4be5f","shortId":"uyCab6","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are gated behind the x402 payment protocol on the Base network, accepting USDC (USD Coin) at $0.02 per request with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint `/api/v1/trades/187` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call. Payment is made via the x402 exact scheme with a 300-second timeout window. The endpoint accepts POST requests and returns application/json.\n\nNote that while the platform advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, etc.), the crawled documentation pages were essentially empty beyond wallet-connect prompts. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind `/api/v1/trades/187` is unclear — the name suggests trade-related data but no further details are available.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","trades API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be inferred from the generic name 'Premium API Access'","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no substantive content","The specific purpose of /api/v1/trades/187 is unclear; it does not appear in the site's listed endpoint catalog","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/187","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/187","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, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the actual functionality of /api/v1/trades/187 is undocumented. Effectively a stub 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'0.02':10,28,79,127 '000':110 '0x8335':115 '20':109 '2913':116 '300':140 '402 payment required' '6':122 'Base network API' 'USDC micropayment API' 'accept':74,146 'access':6,24,100 'actual':202 'advertis':157 'ai/ml':54 'analysi':162 'analyt':53 'api':5,16,23,34,43,84,99 'application/json':151 'avail':197,220 'base':8,26,72,111,118 'base-network' 'behind':65,204 'beyond':179 'broad':47 'call':129 'catalog':48 'categori':160 'challeng':105 'coin':77 'commit':90 'connect':182 'crawl':173,200 'crypto payment API' 'data':52,57,214 'decim':123 'detail':218 'document':174,192 'embed':165 'empti':178 'enabl':42 'endpoint':50,62,93,145,159 'essenti':177 'estim':169 'etc':171 'exact':136 'exampl':196 'feed':167 'finance/web3':56 'function':203 'gas':168 'gate':3,21,64 'geocod':170 'infer':55 'infrastructur':59 'json-response' 'key':17,35,85 'limit':87 'list':96 'lowpaymentfee' 'lowpaymentfee.com':37 'made':132 'mani':158 'name':209 'network':73 'no-api-key' 'note':152 'offer':45 'openapi':187 'page':175 'pay':9,27 'pay-per-call API' 'pay-per-request' 'payment':68,130 'per':11,29,80,128 'platform':44,156 'post':147 'post-method' 'premium':4,22,98 'price':166 'prompt':183 'protocol':69 'rate':86 'relat':213 'request':12,30,81,106,148 'request/response':190 'requir':18,36 'return':102,150 'schema':191 'scheme':137 'second':141 'sentiment':161 'sinc':119 'span':51 'spec':188 'specif':92 'suggest':210 'summar':164 'text':163 'timeout':142 'trade':212 'trade-rel':211 'trades API' 'translat':125 'unclear':207 'unit':112 'upfront':89 'usag':195 'usd':76 'usdc':14,32,75,114,120 'usdc-payment' 'use':121 'util':60 'via':133 'wallet':181 'wallet-connect':180 'window':143 'x402':2,20,41,67,104,135 'x402 API' 'x402-enabled':40 'x402-gated':1,19 'x402-payment'","prices":[{"id":"f9d41b41-82d1-49bd-b3b1-bd1c67a49a2f","listingId":"72cfa562-75b8-432f-8a40-737049e4be5f","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/187","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":"72cfa562-75b8-432f-8a40-737049e4be5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:50.903Z","lastSeenAt":"2026-04-26T04:03:40.847Z"}],"details":{"listingId":"72cfa562-75b8-432f-8a40-737049e4be5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/187 \\\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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/187"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/187"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data behind a per-request USDC micropayment on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go data retrieval settled on-chain"],"bestFor":["Agents or scripts that need keyless, on-demand API access settled in USDC","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer per-call pricing over subscriptions"],"notFor":["High-volume consumers needing bulk pricing or rate-limit guarantees","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.687Z"},"updatedAt":"2026-04-26T04:03:40.847Z"}}