{"id":"41e324b9-8956-4572-805a-10b1dafbf387","shortId":"H3rfnL","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/trades/119` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/trades/119`) falls under a \"trades\" path that is not explicitly listed on the homepage categories, so its exact functionality is unclear. The description simply says \"Premium API Access\" with no further documentation. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details for the request/response, callers should treat this as an exploratory endpoint.","tags":[],"capabilities":["x402-payment","usdc-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"],"warnings":["No documentation available for this specific endpoint — purpose of /api/v1/trades/119 is unknown","No request or response schema provided","Docs, pricing, and API pages return only 'Connect wallet' with no content","The /api/v1/trades/119 path does not appear in the homepage's listed API categories"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/119","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/119","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/trades/119 is undocumented. The docs, pricing, and API pages are all empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,186 'across':112 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,185,195 'attach':95 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93,216 'categori':114,173 'challeng':67 'classif':129 'connect':201 'content':207 'convers':146 'data':115,119 'descript':181 'detail':212 'doc':192 'document':190,209 'embed':130 'endpoint':55,111,149,158,223 'estim':140 'exact':176 'exchang':135 'explicit':168 'exploratori':222 'export':120 'fall':160 'feed':134 'financ':131 'four':113 'function':177 'gas':139 'generat':147 'geocod':144 'header':100 'homepag':172 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,169 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':196 'particular':157 'path':164 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'post-method' 'premium':60,184 'price':133,151,193 'prompt':203 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68,155 'request/response':215 'return':64,198 'say':183 'schema':211 'sentiment':125 'simpli':94,182 'specif':54 'substant':206 'summar':128 'text':127 'token':137 'trade':163 'trades API' 'treat':218 'unclear':179 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':202 'web3':132 'without':208 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"e16ceb71-e753-4b15-9a64-4220c8468ad4","listingId":"41e324b9-8956-4572-805a-10b1dafbf387","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:31.574Z"}],"sources":[{"listingId":"41e324b9-8956-4572-805a-10b1dafbf387","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:31.574Z","lastSeenAt":"2026-04-26T09:33:34.709Z"}],"details":{"listingId":"41e324b9-8956-4572-805a-10b1dafbf387","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/119 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/119"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/119"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related queries via a single micropayment","Integrating pay-per-use API calls into autonomous agents without managing API keys","Exploring x402 protocol-based commerce on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access","Low-volume consumers who prefer no subscriptions or commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.602Z"},"updatedAt":"2026-04-26T09:33:34.709Z"}}