{"id":"e6e85146-fdb5-458f-bc61-27d3ce31d4b1","shortId":"jszfDk","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/36` is listed as \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe site 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/36` endpoint is not listed on the homepage among these categories, and its exact functionality is unclear — the description simply says \"Premium API Access\" with no further documentation.\n\nThe x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maxAmountRequired of 20000 base units equals $0.02 (USDC has 6 decimals). No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","trades endpoint","lowpaymentfee"],"warnings":["The /api/v1/trades/36 endpoint is not listed among the site's publicly advertised APIs — its purpose is unclear.","No documentation, OpenAPI spec, or example responses are available for this endpoint.","All non-homepage pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no useful content.","Functionality behind 'Premium API Access' is entirely opaque — callers cannot know what they are paying for."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific /api/v1/trades/36 endpoint is not listed among the site's advertised APIs. Its actual functionality is 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'/request':13,28 '0.02':12,27,72,185 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':175 '20000':181 '6':188 'Base network API' 'USDC API' 'accept':46,64,167 'access':62,88,154 'across':75,93 'address':170 'advertis':69 'ai':103 'among':139 'analysi':107 'analyt':97 'api':5,20,38,61,81,153 'base':8,23,51,177,182 'call':4,19 'categori':95,141 'challeng':161 'classif':110 'confirm':162 'contract':174 'convers':126 'crawl':202 'data':96,100 'decim':189 'descript':149 'detail':193 'document':158,194 'embed':111 'endpoint':55,78,92,132,164 'equal':184 'estim':121 'exact':144 'exampl':196 'exchang':116 'export':101 'feed':115 'financ':112 'flat':71 'found':199 'four':94 'function':145 'gas':120 'generat':127 'geocod':124 'homepag':138 'howev':128 'infrastructur':123 'insight':102 'instant':87 'key':82 'learn':105 'limit':85 'list':58,135 'live':166 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':104 'maxamountrequir':179 'metric':98 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':91 'openapi':191 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,168 'per':3,18,36,73 'platform':6,21,39,68 'post':65 'post-endpoint' 'premium':60,152 'price':114 'protocol':44 'quot':119 'rate':84,117 'report':99 'request':37,66,74 'respons':197 'say':151 'schema':192 'sentiment':106 'simpli':150 'site':90 'specif':54,130 'summar':109 'text':108 'token':118 'trades endpoint' 'unclear':147 'unit':183 'usdc':15,30,47,173,186 'usdc-base-network' 'use':41 'valid':125 'via':10,25 'web3':113 'x402':11,26,43,160 'x402 API' 'x402-payment'","prices":[{"id":"426c796c-2573-48c6-ae58-a2ac0d2da9c9","listingId":"e6e85146-fdb5-458f-bc61-27d3ce31d4b1","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:52.080Z"}],"sources":[{"listingId":"e6e85146-fdb5-458f-bc61-27d3ce31d4b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:52.080Z","lastSeenAt":"2026-04-26T04:03:40.890Z"}],"details":{"listingId":"e6e85146-fdb5-458f-bc61-27d3ce31d4b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/36 \\\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 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/36"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/trades/36"},{"claim":"The site lists 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 paid API call","Integrating pay-per-use API access into agent workflows without managing API keys","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.63Z"},"updatedAt":"2026-04-26T04:03:40.890Z"}}