{"id":"eaec8dd6-7cc5-4358-b33c-401390adc8d7","shortId":"fpt8VR","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/155` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\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.\n\nThe specific `/api/v1/trades/155` endpoint is not explicitly described in the site's category listings, so its exact functionality is unclear — it may relate to a specific trade record or a trades-related API. The endpoint accepts POST requests and returns `application/json`. Documentation pages (docs, pricing, README) were effectively empty beyond a wallet-connect prompt, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api","trades api","402 payment api"],"warnings":["The specific endpoint /api/v1/trades/155 is not listed in the site's public API catalog — its exact functionality is unknown.","All documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no actual content.","No OpenAPI spec, request schema, or response schema is available.","No examples of request or response payloads could be found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/155","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/155","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) with clear pricing ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/trades/155 is not described anywhere on the site. Docs pages are empty wallet-connect 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'/request':17,34,161 '0.02':16,33,77,92,160 '000':83 '20':82 '402 payment api' '6':90 'accept':200 'access':44,72 'advertis':115 'ai':10,27,127 'analysi':131 'analyt':121 'api':4,21,40,71,103,119,197 'application/json':205 'base':7,24,60,84 'base network api' 'behind':50 'beyond':214 'broader':113 'call':79 'categori':117,176 'classif':134 'connect':218 'convers':151 'cost':74 'data':9,26,120,124 'decim':91 'describ':171 'detail':221 'doc':208 'document':206 'effect':212 'embed':135 'empti':213 'endpoint':14,31,49,64,154,167,199 'estim':145 'exact':99,180 'exchang':140 'explicit':170 'export':125 'feed':139 'financ':11,28,136 'four':116 'function':181 'gas':144 'gate':3,20,43 'generat':152 'geocod':149 'infrastructur':147 'insight':126 'json-api' 'key':104 'learn':129 'limit':107 'list':68,156,177 'low payment fee' 'lowpaymentfee.com':35 'machin':128 'made':95 'marketplac':41 'maxamountrequir':80 'may':185 'metric':122 'micropay':54 'micropayment api' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':207 'pay-per-request api' 'payment':93 'per':52,78 'per-request':51 'per-request-micropayment' 'platform':5,22,114 'point':163 'post':201 'post-method' 'premium':70 'price':138,162,209 'prompt':219 'protocol':39 'quot':143 'rate':106,141 'readm':210 'record':191 'relat':186,196 'report':123 'request':53,202 'request/response':222 'requir':111 'return':204 'schema':223 'scheme':100 'sentiment':130 'settl':55 'site':174 'specif':63,165,189 'subscript':110 'summar':133 'text':132 'token':142 'trade':190,195 'trades api' 'trades-rel':194 'unavail':225 'unclear':183 'unit':85 'usdc':57,87 'usdc api' 'usdc-base' 'util':13,30,148 'valid':150 'varieti':47 'via':96 'wallet':217 'wallet-connect':216 'web3':137 'x402':2,19,38,98 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"405a3188-09ad-4bdb-b02d-024297241542","listingId":"eaec8dd6-7cc5-4358-b33c-401390adc8d7","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/155","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:42.002Z"}],"sources":[{"listingId":"eaec8dd6-7cc5-4358-b33c-401390adc8d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/155","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:42.002Z","lastSeenAt":"2026-04-26T07:03:05.622Z"}],"details":{"listingId":"eaec8dd6-7cc5-4358-b33c-401390adc8d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/155 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network via x402 exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/trades/155"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or trade-related information via a single micropayment","Programmatic pay-per-call API consumption without managing API keys or subscriptions","Agent-driven workflows that need on-demand premium data with crypto settlement"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.08Z"},"updatedAt":"2026-04-26T07:03:05.622Z"}}