{"id":"664e84b0-ac9a-41d3-8834-f1e36c1776b0","shortId":"zuNGjs","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/182` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or upfront commitments required.\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. However, the specific `/api/v1/trades/182` endpoint does not clearly map to any of these advertised categories, and its exact functionality is not documented beyond the generic \"Premium API Access\" label.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data the `/api/v1/trades/182` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine what you'll actually receive after payment.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["data","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","Base USDC API","trades endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The endpoint path /api/v1/trades/182 does not match any of the advertised API categories on the homepage","No request body schema or response schema is provided; callers cannot know what to send or expect back","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/182","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality ('Premium API Access' for /api/v1/trades/182) is completely undescribed. This is effectively a stub 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'/request':17,34,167 '0.02':16,33,94,166 '000':86 '0x8335':91 '20':85 '402':247 '6':99 'Base USDC API' 'accept':74 'access':45,72,196 'actual':237,262 'advertis':122,182 'ai':10,27,134 'analysi':138 'analyt':128 'api':4,21,41,71,111,195,204 'base':7,24,61,87 'behind':51 'beyond':191 'broader':120 'categori':124,183 'challeng':79,248 'classif':141 'clear':176 'commit':117 'confirm':242 'connect':213 'content':219 'convers':158 'cost':83 'data':9,26,127,131,233 'decim':100 'descript':230 'determin':258 'difficult':256 'doc':203 'document':190,198,253 'embed':142 'endpoint':14,31,50,65,126,162,173,236,240 'equal':93 'estim':152 'exact':107,186 'exampl':227 'exchang':147 'export':132 'extrem':200 'feed':146 'financ':11,28,143 'four':123 'function':187 'gas':151 'gate':3,20,44 'generat':159 'generic':193 'geocod':156 'howev':169 'indic':80 'infrastructur':154 'insight':133 'json-response' 'key':112 'label':197 'lack':251 'learn':136 'limit':114 'list':68,161 'live':243 'll':261 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':103 'make':254 'map':177 'marketplac':42 'maximum':82 'metric':129 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':223 'page':208 'pay-per-request API' 'payment':101,265 'per':53,95 'per-request':52 'per-request-micropayment' 'platform':5,22,121 'post':75 'post-endpoint' 'premium':70,194 'price':145,168,205 'prompt':215 'protocol':40 'quot':150 'rate':113,148 'readm':207 'receiv':263 'render':210 'report':130 'request':54,76,96 'request/response':226 'requir':118 'return':238,244 'schema':224 'scheme':108 'sentiment':137 'settl':56 'share':163 'spars':201 'specif':64,171 'substant':218 'summar':140 'text':139 'token':149 'trades endpoint' 'unit':88 'upfront':116 'usdc':58,90,97 'usdc-base' 'use':98 'util':13,30,155 'valid':157,246 'varieti':48 'via':104 'wallet':214 'web3':144 'x402':2,19,39,78,106 'x402 trades API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9d1a410c-da2d-49a4-96bf-77e0a24da3af","listingId":"664e84b0-ac9a-41d3-8834-f1e36c1776b0","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:46.187Z"}],"sources":[{"listingId":"664e84b0-ac9a-41d3-8834-f1e36c1776b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/182","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:46.187Z","lastSeenAt":"2026-04-26T05:32:45.888Z"}],"details":{"listingId":"664e84b0-ac9a-41d3-8834-f1e36c1776b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/182 \\\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, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/trades/182"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or premium content behind a per-call micropayment wall","Programmatic agents that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 micropayment protocols","AI agents needing keyless API access with crypto settlement","Users who want pay-per-use pricing with no subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who need bulk pricing or rate guarantees","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.857Z"},"updatedAt":"2026-04-26T05:32:45.888Z"}}