{"id":"bdcc3451-39ce-42ca-962d-e27a74fbecfe","shortId":"Lk4zg7","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 `/api/v1/trades/127` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. 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. However, the specific `/api/v1/trades/127` endpoint does not clearly map to any of these documented categories — its exact functionality is not described 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 additional technical detail, schemas, or example payloads. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's indication that the input method is POST and the output MIME type is application/json. The endpoint is live and responding with a valid 402 challenge, but what data it actually returns after payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["finance","data","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","trades API","premium API access"],"warnings":["The specific endpoint /api/v1/trades/127 is not listed among the documented API categories on the homepage — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, request schema, or response schema is available — the actual data returned after payment is undocumented.","No examples of successful responses exist in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/127","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/127","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 it is operational. However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what the /api/v1/trades/127 endpoint actually returns. The crawled docs/pricing/README pages are all blank beyond a wallet connect prompt. The listing is essentially a 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'/request':17,34,164 '0.02':16,33,88,163 '000':82 '20':81 '402':76,258 '6':92 'Base network API' 'USDC API' 'access':45,72,193 'actual':264 'addit':215 'advertis':118 'ai':10,27,130 'analysi':134 'analyt':124 'api':4,21,41,71,106,122,192,201 'application/json':248 'avail':272 'base':7,24,61,83 'base-network' 'behind':51 'beyond':188,230 'broader':116 'call':95 'categori':120,181 'challeng':77,233,259 'classif':137 'clear':174 'connect':210 'convers':154 'data':9,26,123,127,262 'decim':93 'describ':187 'detail':217 'doc':200 'document':180,195 'embed':138 'endpoint':14,31,50,65,157,171,250 'estim':148 'exact':102,183 'exampl':220 'exchang':143 'export':128 'extrem':197 'feed':142 'financ':11,28,139 'four':119 'function':184 'gas':147 'gate':3,20,44 'generat':155 'generic':190 'geocod':152 'given':89 'howev':167 'i.e':87 'indic':235 'infrastructur':150 'input':238 'insight':129 'json-response' 'key':107 'label':194 'learn':132 'limit':110 'list':68,159 'live':252 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':131 'made':98 'map':175 'materi':273 'method':239 'metric':125 'micropay':55 'micropayment API' 'mime':245 'network':62 'no-api-key' 'offer':8,25 'openapi':225 'output':244 'page':205 'pay-per-request API' 'payload':221 'payment':96,267 'per':53,94 'per-request':52 'per-request-billing' 'platform':5,22,42,117 'point':166 'post':241 'post-method' 'premium':70,191 'premium API access' 'price':141,165,202 'prompt':212 'protocol':40 'quot':146 'rate':109,144 'readm':204 'render':207 'report':126 'request':54,78 'request/response':228 'requir':114 'respond':254 'return':74,265 'schema':218,229 'scheme':103 'sentiment':133 'settl':56 'spars':198 'spec':226 'specif':64,169 'subscript':113 'summar':136 'technic':216 'text':135 'token':145 'trades API' 'type':246 'unit':84 'unknown':269 'usdc':58,86,90 'usdc-micropayment' 'util':13,30,151 'valid':153,257 'varieti':48 'via':99 'wallet':211 'web3':140 'x402':2,19,39,101,232 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"81b6a2a1-b7b1-4f3d-b55e-61a786ff4d1e","listingId":"bdcc3451-39ce-42ca-962d-e27a74fbecfe","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:24.326Z"}],"sources":[{"listingId":"bdcc3451-39ce-42ca-962d-e27a74fbecfe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:24.326Z","lastSeenAt":"2026-04-25T03:03:27.938Z"}],"details":{"listingId":"bdcc3451-39ce-42ca-962d-e27a74fbecfe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/127 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/trades/127"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, and README pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or premium content behind a single $0.02 USDC micropayment","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand data with crypto-native payment"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.933Z"},"updatedAt":"2026-04-25T03:03:27.938Z"}}