{"id":"cd1bb95b-4ce2-4c99-94d1-426ab9b5b427","shortId":"qptsr5","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/170` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing.\n\nThe specific `/api/v1/trades/170` endpoint's purpose is unclear from the available documentation — it falls under a \"trades\" path that is not explicitly listed on the homepage. The endpoint accepts POST requests and returns `application/json`. Documentation pages beyond the landing page were effectively empty (showing only \"Connect wallet\"), so detailed request/response schemas, parameter descriptions, and example payloads are unavailable.","tags":[],"capabilities":["x402-payment","per-request-micropayment","usdc-settlement","base-network","json-api","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","trades API","lowpaymentfee"],"warnings":["The /api/v1/trades/170 path is not listed among the homepage's advertised endpoints — its purpose is unclear.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.","No request or response schema is available; callers cannot know what parameters to send or what data to expect.","The endpoint's actual behavior and data returned are entirely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/170","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/170","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 there is no documentation for the /trades/170 path specifically, no request/response schema, and all doc pages beyond the homepage are empty. The endpoint's actual functionality is 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'/request':17,34,158 '0.02':16,33,77,91,157 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'accept':188 'access':44,72 'advertis':113 'ai':10,27,125 'analysi':129 'analyt':119 'api':4,21,40,71,93 'application/json':193 'attach':102 'avail':170 'base':7,24,60,84 'base-network' 'behind':50 'beyond':196 'broader':111 'call':79 'caller':100 'categori':115 'classif':132 'connect':205 'convers':149 'cost':74 'data':9,26,118,122 'decim':90 'descript':212 'detail':208 'document':171,194 'effect':201 'embed':133 'empti':202 'endpoint':14,31,49,64,117,153,163,187 'estim':143 'exampl':214 'exchang':138 'explicit':181 'export':123 'fall':173 'feed':137 'financ':11,28,134 'four':114 'gas':142 'gate':3,20,43 'generat':150 'geocod':147 'header':106 'homepag':185 'infrastructur':145 'insight':124 'json-api' 'key':94 'land':198 'learn':127 'limit':97 'list':68,152,182 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'marketplac':41 'maxamountrequir':80 'metric':120 'micropay':54 'micropayment API' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':195,199 'paramet':211 'path':177 'pay-per-request API' 'payload':215 'payment':105 'per':52,78 'per-request':51 'per-request-micropayment' 'platform':5,22,112 'post':189 'post-method' 'premium':70 'price':136,159 'protocol':39 'purpos':165 'quot':141 'rate':96,139 'report':121 'request':53,109,190 'request/response':209 'requir':99 'return':192 'schema':210 'sentiment':128 'settl':55 'share':154 'show':203 'simpli':101 'specif':63,161 'summar':131 'text':130 'token':140 'trade':176 'trades API' 'unavail':217 'unclear':167 'unit':85 'usdc':57,87 'usdc-settlement' 'util':13,30,146 'valid':148 'varieti':47 'wallet':206 'web3':135 'x402':2,19,38,104 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"51fd516a-0d0f-4ce8-9b6d-1c5d5134a921","listingId":"cd1bb95b-4ce2-4c99-94d1-426ab9b5b427","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:43.815Z"}],"sources":[{"listingId":"cd1bb95b-4ce2-4c99-94d1-426ab9b5b427","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:43.815Z","lastSeenAt":"2026-04-26T05:32:45.772Z"}],"details":{"listingId":"cd1bb95b-4ce2-4c99-94d1-426ab9b5b427","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/170 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/170"},{"claim":"All listed endpoints are priced 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 endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/170"}],"useCases":["Accessing trade data or executing trade-related operations via a single paid API call","Integrating pay-per-use API access into autonomous agents without managing API keys","Programmatic access to financial or trade information settled on-chain"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Use cases requiring on-chain payment settlement on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["High-volume consumers needing bulk pricing or subscription discounts","Users who need detailed API documentation and schemas before integrating","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.023Z"},"updatedAt":"2026-04-26T05:32:45.772Z"}}