{"id":"1af1676d-174f-4e47-bb68-e7360502b84c","shortId":"cqY8ze","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/87` is listed as \"Premium API Access\" and appears to serve trade-related data. The platform advertises four broad 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).\n\nPricing is uniform at $0.02 per request across all listed endpoints. The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the maximum timeout is 300 seconds.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/trades/87` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to POST or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","trade-data","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-apis"],"categories":["finance","data","llm","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 trade API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request or response formats","The specific endpoint /api/v1/trades/87 has no description beyond 'Premium API Access' — unclear what trade data it returns","The trades endpoint is not listed on the homepage's API catalog, raising questions about its purpose"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/87","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the trades/87 endpoint actually returns or what input it expects. This is effectively a stub 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'/request':17,34 '0.02':16,33,126,158 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':193 '0x8335':150 '20000':144 '2913':151 '300':199 '402':249 '6':154 'Base network API' 'USDC API' 'access':45,72 'across':129 'actual':240 'addit':221 'address':191 'advertis':83 'ai':10,27,96 'ai-inference' 'analysi':100 'analyt':90 'api':4,21,41,71,88,169,207 'appear':74 'attach':182 'base':7,24,61,145,153 'behind':51 'broad':85 'caller':180 'categori':86 'challeng':135,250 'classif':103 'connect':216 'content':222 'contract':149 'convers':120 'crypto-data' 'data':9,26,80,89,93,262 'data-analytics' 'decim':155 'descript':234 'detail':233 'difficult':258 'doc':206 'document':201,255 'embed':104 'endpoint':14,31,50,65,132,139,239,243 'equal':157 'estim':114 'exact':165 'exampl':230 'exchang':109 'expect':269 'export':94 'extrem':203 'feed':108 'financ':11,28,105 'finance-data' 'four':84 'gas':113 'gate':3,20,44 'generat':121 'geocod':118 'geocoding' 'header':187 'infrastructur':116 'insight':95 'key':170 'know':260 'lack':253 'learn':98 'limit':173 'list':68,131 'live':245 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':97 'made':161 'make':256 'marketplac':42 'maxamountrequir':142 'maximum':196 'metric':91 'micropay':55 'micropayment API' 'network':62 'offer':8,25 'openapi':226 'page':211 'pay-per-call API' 'payment':159,186,189 'per':53,127 'per-request':52 'per-request-micropayment' 'platform':5,22,82 'post':264 'premium':70 'price':107,122,208 'prompt':218 'proper':248 'protocol':40 'quot':112 'rate':110,172 'readm':210 'recipi':190 'relat':79 'render':213 'report':92 'request':54,128 'request/response':229 'requir':179 'respons':267 'return':241,246 'schema':227 'scheme':166 'second':200 'sentiment':99 'serv':76 'settl':56 'show':140 'sign':177 'sign-up':176 'simpli':181 'spars':204 'specif':64,138 'summar':102 'text':101 'timeout':197 'token':111 'trade':78 'trade-data' 'trade-rel':77 'uniform':124 'unit':146 'usdc':58,148 'usdc-base' 'util':13,30,117 'utility-apis' 'valid':119 'varieti':48 'via':162 'wallet':217 'web3':106 'x':185 'x-payment':184 'x402':2,19,39,134,164 'x402 trade API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"3941d2ca-cc07-44e6-8f17-3c7f25f76239","listingId":"1af1676d-174f-4e47-bb68-e7360502b84c","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:58.648Z"}],"sources":[{"listingId":"1af1676d-174f-4e47-bb68-e7360502b84c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:58.648Z","lastSeenAt":"2026-04-22T23:02:06.174Z"}],"details":{"listingId":"1af1676d-174f-4e47-bb68-e7360502b84c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/87 \\\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":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/trades/87"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data without API key registration","Accessing AI inference endpoints (sentiment, summarization, classification) on a pay-per-use basis","Retrieving real-time crypto quotes and gas estimates","Geocoding and data conversion utilities via micropayments"],"bestFor":["Agents or developers who want instant API access without sign-up or API keys","Low-volume or sporadic usage where per-request pricing is cheaper than subscriptions","x402-compatible wallets and agents on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or SLAs before integrating","Users without USDC on Base or an x402-compatible payment flow"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.301Z"},"updatedAt":"2026-04-22T23:02:06.174Z"}}