{"id":"09ab94ed-c58d-46c1-9deb-4583c3e07221","shortId":"LXRrVQ","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 platform 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/199` 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…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 are listed at the same $0.02/request price point. However, the specific `/api/v1/trades/199` endpoint does not clearly map to any of these documented categories, and no detailed documentation, request/response schemas, or examples are available for it. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content.\n\nBecause the endpoint path includes a numeric ID (`/trades/199`), it likely returns data about a specific trade or transaction, but this is speculative. Without request body schemas or sample responses, callers will need to experiment to determine the expected input format and output structure.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","trades API","lowpaymentfee","402 payment endpoint"],"warnings":["No request body schema or response schema available for /api/v1/trades/199","The endpoint path does not match any of the documented API categories on the landing page","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","The purpose of the /trades/199 endpoint is unclear — 'Premium API Access' is a generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/199","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/199","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific endpoint path (/trades/199) is not described anywhere on the site. Docs pages render only 'Connect wallet' with no 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'/request':17,34,172 '/trades/199':227 '0.02':16,33,95,171 '000':87 '0x8335':92 '20':86 '402 payment endpoint' '6':100 'Base USDC API' 'accept':75 'access':45,73 'advertis':81,127 'ai':10,27,139 'amount':84 'analysi':143 'analyt':133 'api':4,21,41,72,103,206 'attach':112 'avail':199 'base':7,24,61,88 'behind':51 'bodi':244 'broader':125 'caller':110,249 'categori':129,189 'challeng':80 'classif':146 'clear':182 'connect':212 'content':218 'convers':163 'data':9,26,132,136,231 'decim':101 'detail':192 'determin':255 'doc':203 'document':188,193 'embed':147 'endpoint':14,31,50,65,131,179,221 'equal':94 'estim':157 'exampl':197 'exchang':152 'expect':257 'experi':253 'export':137 'feed':151 'financ':11,28,148 'format':259 'four':128 'gas':156 'gate':3,20,44 'generat':164 'geocod':161 'header':117 'howev':175 'id':226 'includ':223 'infrastructur':159 'input':258 'insight':138 'json-response' 'key':104 'learn':141 'like':229 'limit':107 'list':69,167 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'map':183 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'need':251 'network':62 'no-api-key' 'no-rate-limit' 'numer':225 'offer':8,25 'output':261 'page':207 'path':222 'pay-per-request API' 'payment':116,122 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,42,126 'point':174 'post':76 'post-endpoint' 'premium':71 'price':150,173,204 'prompt':214 'proof':123 'protocol':40 'quot':155 'rate':106,153 'render':209 'report':135 'request':54,77,97,243 'request/response':194 'requir':109 'respons':248 'return':230 'sampl':247 'schema':195,245 'sentiment':142 'settl':56 'simpli':111 'specif':64,177,234 'specul':241 'structur':262 'summar':145 'text':144 'token':154 'trade':235 'trades API' 'transact':237 'unit':89 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':213 'web3':149 'without':242 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"36328b82-2c40-4870-a540-29a2288b09e2","listingId":"09ab94ed-c58d-46c1-9deb-4583c3e07221","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:53.301Z"}],"sources":[{"listingId":"09ab94ed-c58d-46c1-9deb-4583c3e07221","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:53.301Z","lastSeenAt":"2026-04-26T04:32:50.410Z"}],"details":{"listingId":"09ab94ed-c58d-46c1-9deb-4583c3e07221","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/199 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/199"},{"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 across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving trade or transaction data via a single micropayment","Programmatic access to premium data without subscription or API key management","Agent-driven data retrieval with on-chain payment settlement"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer no-commitment, usage-based pricing"],"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-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.574Z"},"updatedAt":"2026-04-26T04:32:50.410Z"}}