{"id":"9b71a10e-d2c9-4e3e-8110-25a110d9a2d3","shortId":"e6CFEK","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 `/api/v1/trades/67` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which at 6 decimals equals $0.02 per call.\n\nThe broader platform advertises four categories of APIs: 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 specific `/api/v1/trades/67` route. The purpose of the \"trades/67\" endpoint is unclear from available material; it may relate to the Finance & Web3 category but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["finance","data","llm","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","USDC API","Base network API","trades API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet' with no content.","The specific purpose and expected input/output of /api/v1/trades/67 is unknown; 'Premium API Access' is a generic label.","No OpenAPI schema or request/response examples are provided by the platform.","The platform lists many endpoint categories but it is unclear which are actually functional versus placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/67","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/67","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 402 challenge, confirming it is operational. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — every doc page just shows 'Connect wallet'. The specific purpose of /api/v1/trades/67 is unclear. This is effectively a stub 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'/api/v1/trades/67':66,200 '/docs':165 '/pricing':167 '/readme':169 '/request':17,34 '0.02':16,33,96,145 '000':85 '0x8335':90 '20':84 '6':93 'Base network API' 'USDC API' 'accept':74 'access':45,72 'advertis':80,102 'ai':10,27,114 'ai-inference' 'analysi':118 'analyt':108 'api':4,21,41,71,106,150 'avail':211 'base':7,24,61,86 'behind':51 'broader':100 'call':98 'categori':104,220 'challeng':79 'classif':121 'commit':158 'connect':175 'content':181 'convers':138 'crypto-data' 'data':9,26,107,111 'data-analytics' 'decim':94 'detail':192 'document':160,193 'embed':122 'endpoint':14,31,50,65,141,196,207 'equal':95 'estim':132 'exampl':189 'exchang':127 'export':112 'extrem':162 'feed':126 'financ':11,28,123,218 'finance-data' 'four':103 'gas':131 'gate':3,20,44 'generat':139 'geocod':136 'includ':197 'infrastructur':134 'insight':113 'key':151 'learn':116 'limit':154 'list':68,143 'low payment fee' 'lowpaymentfee.com':35 'machin':115 'marketplac':42 'materi':212 'maxamountrequir':82 'may':214 'metric':109 'micropay':55 'micropayment API' 'minimum':157 'network':62 'offer':8,25 'openapi':185 'page':170 'pay-per-request API' 'per':53,97,146 'per-request':52 'per-request-micropayment' 'platform':5,22,101 'post':75 'post-endpoint' 'premium':70 'price':125 'prompt':177 'protocol':40 'purpos':203 'quot':130 'rate':128,153 'relat':215 'render':172 'report':110 'request':54,76,147 'request/response':188 'requir':159 'rout':201 'schema':186 'sentiment':117 'settl':56 'spars':163 'specif':64,199 'specul':224 'summar':120 'text':119 'token':129 'trades API' 'trades/67':206 'unclear':209 'unit':87 'usdc':58,89 'usdc-base' 'util':13,30,135 'utility-services' 'valid':137 'varieti':48 'wallet':176 'web3':124,219 'x402':2,19,39,78 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ab61ac16-bc4f-4684-bab9-2665b1a54d20","listingId":"9b71a10e-d2c9-4e3e-8110-25a110d9a2d3","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:08.881Z"}],"sources":[{"listingId":"9b71a10e-d2c9-4e3e-8110-25a110d9a2d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:08.881Z","lastSeenAt":"2026-04-22T23:02:06.637Z"}],"details":{"listingId":"9b71a10e-d2c9-4e3e-8110-25a110d9a2d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/67 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/67"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing financial trade data or analytics via a single micropayment per request","Integrating pay-per-use API calls into agent workflows without API key management","Consuming AI inference endpoints (sentiment, summarization, classification) at low per-call cost"],"bestFor":["Agents or developers wanting zero-commitment, pay-per-call API access","Use cases requiring no API key registration or rate limit negotiation","Micropayment-native workflows on the Base L2 network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.871Z"},"updatedAt":"2026-04-22T23:02:06.637Z"}}