{"id":"e6df361c-7f85-41a1-975e-dfdda89ab64d","shortId":"VbsnvT","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/173` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\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 the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\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 spec, no request/response schema documentation, and no examples available. The specific `/api/v1/trades/173` endpoint's purpose is unclear from the available material; the path suggests a trade-related resource (possibly a specific trade record), but no documentation describes what it returns or what POST body it expects. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-request API","x402 API","USDC API","Base network API","trades API","low fee API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected request body for /api/v1/trades/173 are unknown","No response schema or example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/173","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/trades/173 is undocumented. The docs pages are empty beyond a wallet connect 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'/api/v1/trades/173':65,207 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34,153 '0.02':16,33,96,152 '000':85 '0x8335':90 '20':84 '2913':91 '402':251 '6':102 'Base network API' 'USDC API' 'accept':73 'access':71,169 'advertis':79,107 'ai':10,27,119 'analysi':123 'analyt':113 'api':4,21,41,70,111,160 'avail':204,215 'base':7,24,59,86,93 'base-network' 'behind':49 'bodi':240 'broader':105 'categori':109 'challeng':78,252 'classif':126 'confirm':246 'connect':185 'content':191 'convers':143 'cost':82 'data':9,26,112,116 'decim':103 'describ':233 'document':170,200,232 'embed':127 'emphas':158 'endpoint':14,31,48,63,146,208,244 'equal':95 'estim':137 'exampl':203 'exchang':132 'expect':242 'export':117 'extrem':172 'feed':131 'financ':11,28,128 'four':108 'gas':136 'gate':3,20,44 'generat':144 'geocod':141 'given':99 'infrastructur':139 'insight':118 'instant':168 'json-response' 'key':161 'learn':121 'limit':164 'list':67,148 'live':247 'low fee API' 'lowpaymentfee.com':35 'machin':120 'materi':216 'maximum':81 'metric':114 'micropay':53 'micropayment API' 'minimum':166 'network':60 'no-api-key' 'offer':8,25 'openapi':195 'page':180 'path':218 'pay-per-request API' 'per':51,97 'per-request':50 'per-request-billing' 'platform':5,22,42,106,157 'point':155 'possibl':225 'post':74,239 'post-endpoint' 'premium':69 'price':130,154 'prompt':187 'protocol':40 'purpos':210 'quot':135 'rate':133,163 'record':229 'relat':223 'render':182 'report':115 'request':52,75,98 'request/response':198 'resourc':224 'respons':253 'return':236 'schema':199 'sentiment':122 'settl':54 'spars':173 'spec':196 'specif':62,206,227 'suggest':219 'summar':125 'text':124 'token':134 'trade':222,228 'trade-rel':221 'trades API' 'unclear':212 'unit':87 'usdc':56,89,100 'usdc-micropayment' 'util':13,30,140 'valid':142,250 'varieti':46 'via':248 'wallet':186 'web3':129 'x402':2,19,39,77 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ba8be458-52f9-42fa-a61a-88f6a0933795","listingId":"e6df361c-7f85-41a1-975e-dfdda89ab64d","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:36.486Z"}],"sources":[{"listingId":"e6df361c-7f85-41a1-975e-dfdda89ab64d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:36.486Z","lastSeenAt":"2026-04-26T08:03:30.689Z"}],"details":{"listingId":"e6df361c-7f85-41a1-975e-dfdda89ab64d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/173 \\\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 (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/173"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/173"}],"useCases":["Accessing trade data via a single micropayment without needing an API key or subscription","Agent-driven workflows that need per-call payment for data retrieval on Base","Programmatic access to trade records with USDC settlement"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no API key management or rate limit concerns"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.375Z"},"updatedAt":"2026-04-26T08:03:30.689Z"}}