{"id":"ff022f15-b98b-45b6-b1af-f89061550acd","shortId":"AVzX4a","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 at `/api/v1/trades/32` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request.\n\nThe broader platform organizes its APIs into 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 uniformly priced 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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/32` is unclear beyond its generic \"Premium API Access\" label; it likely returns trade-related data but the exact schema and parameters are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","per-request-billing","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["finance","data","llm","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","trades api","lowpaymentfee"],"warnings":["No OpenAPI spec or any endpoint documentation available","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content","The exact purpose and schema of /api/v1/trades/32 ('Premium API Access') is undocumented and unclear","No request or response examples could be found anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation for the /api/v1/trades/32 endpoint — no request schema, no response schema, no examples, and no explanation of what 'Premium API Access' actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/trades/32':67,208 '/docs':172 '/pricing':174 '/readme':176 '/request':17,34 '0.02':16,33,101,152 '000':87 '0x8335':92 '20':86 '2913':93 '6':98 'accept':75 'access':45,73,216 'advertis':81 'ai':10,27,120 'ai-inference' 'amount':84 'analysi':124 'analyt':114 'api':4,21,41,72,109,157,215 'avail':203 'base':7,24,61,88,95 'base usdc api' 'behind':51,207 'beyond':211 'broader':105 'categori':112 'challeng':80 'classif':127 'commit':165 'connect':182 'convers':144 'crypto-data' 'data':9,26,113,117,224 'data-analytics' 'decim':99 'detail':189 'document':167,198 'embed':128 'endpoint':14,31,50,65,147 'equal':100 'estim':138 'exact':227 'exampl':201 'exchang':133 'export':118 'extrem':169 'feed':132 'financ':11,28,129 'finance-data' 'four':111 'function':206 'gas':137 'gate':3,20,44 'generat':145 'generic':213 'geocod':142 'infrastructur':140 'insight':119 'key':158 'label':217 'learn':122 'like':219 'limit':161 'list':69 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'marketplac':42 'maximum':83 'metric':115 'micropay':55 'micropayment' 'micropayment api' 'minimum':164 'network':62 'no-api-key' 'offer':8,25 'openapi':193 'organ':107 'page':177 'paramet':230 'pay-per-request api' 'payload':202 'per':53,102,153 'per-request':52 'per-request-billing' 'platform':5,22,106 'post':76 'post-endpoint' 'premium':71,214 'price':131,150 'prompt':184 'protocol':40 'quot':136 'rate':134,160 'relat':223 'render':179 'report':116 'request':54,77,103,154 'request/response':196 'requir':166 'return':220 'schema':197,228 'sentiment':123 'settl':56 'spars':170 'spec':194 'specif':64,205 'summar':126 'technic':188 'text':125 'token':135 'trade':222 'trade-rel':221 'trades api' 'unclear':210 'undocu':232 'uniform':149 'unit':89 'usdc':58,91 'usdc-base' 'util':13,30,141 'utility-services' 'valid':143 'varieti':48 'wallet':183 'web3':130 'x402':2,19,39,79 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"87bfb339-9e55-4e07-8ec4-8cfbf89ff8fc","listingId":"ff022f15-b98b-45b6-b1af-f89061550acd","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:48.543Z"}],"sources":[{"listingId":"ff022f15-b98b-45b6-b1af-f89061550acd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:48.543Z","lastSeenAt":"2026-04-22T23:02:05.661Z"}],"details":{"listingId":"ff022f15-b98b-45b6-b1af-f89061550acd","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/request).\n# Using curl with a hypothetical X-PAYMENT token:\ncurl -X POST https://lowpaymentfee.com/api/v1/trades/32 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/trades/32"},{"claim":"The platform lists uniform pricing of $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"APIs are organized into Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data via a single micropayment without needing an API key or subscription","Integrating pay-per-call data and analytics endpoints into agent workflows","Querying financial price feeds and crypto gas estimates with USDC micropayments"],"bestFor":["Agents or developers wanting zero-commitment, pay-per-request API access","x402-compatible wallets and clients on the Base network","Low-volume or exploratory use cases where subscriptions are overkill"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing at $0.02 may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.799Z"},"updatedAt":"2026-04-22T23:02:05.661Z"}}