{"id":"e98a48d2-b522-413a-a83a-070f4b7a6842","shortId":"vmuAHY","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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/25` is listed under \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access.\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 (geocoding, validation, conversion, generation). However, the specific `/api/v1/trades/25` endpoint probed here does not appear in any of these listed categories on the landing page, and its exact functionality is unclear — the description simply says \"Premium API Access.\"\n\nThe x402 challenge confirms the endpoint is live, accepting payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","trades API","premium API access"],"warnings":["The endpoint /api/v1/trades/25 does not appear in the platform's listed API catalog — its purpose is unclear","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","No request body schema or response schema is available for this endpoint","The platform lists many endpoint categories but provides no detailed documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/trades/25 is not documented on the landing page, no request/response schema is available, and all documentation pages returned only 'Connect wallet' with no content. The actual functionality of this endpoint is 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'/request':13,30 '0.02':12,29,76,191 '000':187 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':178 '20':186 '6':195 'Base network API' 'USDC API' 'accept':50,68,173 'access':66,91,164 'across':79,97 'actual':225 'address':201 'advertis':73 'ai':107 'amount':184 'analysi':111 'analyt':101 'api':5,15,22,32,42,65,84,163 'appear':141 'base':8,25,55,180,188 'beyond':209 'broader':93 'call':4,21 'categori':99,147 'challeng':167 'classif':114 'confirm':168 'connect':216 'content':222 'contract':177 'convers':130 'data':100,104 'decim':196 'descript':159 'document':207 'embed':115 'endpoint':59,81,96,136,170,230 'estim':125 'exact':154,205 'exchang':120 'export':105 'feed':119 'financ':116 'flat':75 'four':98 'function':155 'gas':124 'generat':131 'geocod':128 'given':192 'howev':132 'i.e':190 'infrastructur':127 'insight':106 'instant':90 'json-response' 'key':16,33,85 'land':150,211 'learn':109 'limit':88 'list':62,146 'live':172 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':108 'max':183 'metric':102 'micropayment API' 'network':9,26,56 'no-api-key' 'offer':95 'page':151,208,212 'pay':2,19,39 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,174,197 'per':3,20,40,77 'platform':6,23,43,72,94 'post':69 'post-endpoint' 'premium':64,162 'premium API access' 'price':118 'probe':137 'prompt':218 'protocol':48 'quot':123 'rate':87,121 'report':103 'request':41,70,78 'request/response':226 'requir':17,34 'return':213 'say':161 'schema':227 'scheme':206 'sentiment':110 'settl':199 'simpli':160 'specif':58,134 'substant':221 'summar':113 'text':112 'token':122 'trades API' 'unclear':157 'unit':189 'unknown':232 'usdc':51,176,193 'usdc-base' 'use':45,203 'valid':129 'via':10,27 'wallet':217 'web3':117 'x402':11,28,47,166 'x402 API' 'x402-payment'","prices":[{"id":"d86e3d6e-2d52-4c54-91db-37ae5ea4e933","listingId":"e98a48d2-b522-413a-a83a-070f4b7a6842","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:57.451Z"}],"sources":[{"listingId":"e98a48d2-b522-413a-a83a-070f4b7a6842","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:57.451Z","lastSeenAt":"2026-04-26T03:03:00.082Z"}],"details":{"listingId":"e98a48d2-b522-413a-a83a-070f4b7a6842","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/25 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/25"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/25"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data via a single pay-per-call request without needing an API key","Integrating low-cost API calls into agent workflows that settle payments in USDC on Base","Programmatic access to premium data endpoints with no subscription or rate limits"],"bestFor":["Developers wanting zero-setup API access with crypto micropayments","AI agents that can autonomously pay for API calls via x402","Users who prefer pay-as-you-go pricing without commitments"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.405Z"},"updatedAt":"2026-04-26T03:03:00.082Z"}}