{"id":"865ef566-614d-4f48-b6ac-55da37743650","shortId":"TcS9En","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 broad set of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/120` is labeled \"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). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four endpoint categories: 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/120` endpoint does not clearly map to any of the documented categories — it may be a trade-data or financial endpoint, but its exact functionality is not documented.\n\nThe platform accepts POST requests and returns JSON responses. Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["trades API","micropayment API","x402 API","pay-per-call API","Base USDC API","lowpaymentfee","low payment fee"],"warnings":["The /api/v1/trades/120 endpoint is not listed among the documented API categories on the landing page — its exact functionality is unclear.","All documentation, pricing, and README pages beyond the homepage returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","No examples of request bodies or response payloads are documented anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/120","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for the /api/v1/trades/120 endpoint specifically — its request/response schema, purpose, and parameters are unknown. Docs pages returned only 'Connect wallet' with no technical 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'/request':17,34,166 '0.02':16,33,78,93,165 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':215 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':218 '1':229 '20':83 '6':91 'Base USDC API' 'accept':203 'access':45,73 'addit':252 'address':214 'advertis':121 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,72,95 'attach':106 'base':7,24,62,85,220 'behind':52 'beyond':240 'broad':48 'broader':119 'call':80 'caller':104 'captur':226 'categori':124,183 'challeng':223 'classif':139 'clear':176 'commit':101 'confirm':233 'connect':247 'convers':156 'cost':75 'data':9,26,125,129,190 'decim':92 'detail':254 'document':182,200,238 'embed':140 'endpoint':14,31,51,66,123,159,173,193,235 'estim':150 'exact':196 'exchang':145 'export':130 'feed':144 'financ':11,28,141 'financi':192 'four':122 'function':197 'gas':149 'gate':3,20,44 'generat':157 'geocod':154 'header':111 'howev':169 'infrastructur':152 'insight':131 'json':208 'json-api' 'key':96 'label':70 'land':242 'learn':134 'limit':98 'list':161 'live':237 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'map':177 'maxamountrequir':81 'may':185 'metric':127 'micropay':56 'micropayment API' 'network':63 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':239,243 'pay-per-call API' 'payment':110,116,210 'per':54,79 'per-request':53 'per-request-micropayment' 'platform':5,22,42,120,202 'point':168 'post':204 'post-method' 'premium':71 'price':143,167 'prompt':249 'proof':117 'protocol':40,232 'quot':148 'rate':97,146 'report':128 'request':55,205 'requir':103 'respons':209 'return':207,244 'sentiment':135 'set':49 'settl':57,212 'simpli':105 'specif':65,171 'success':225 'summar':138 'technic':253 'text':137 'token':147 'trade':189 'trade-data':188 'trades API' 'unit':86 'upfront':100 'usdc':59,88,217 'usdc-base' 'use':216 'util':13,30,153 'valid':114,155 'version':228 'wallet':248 'web3':142 'x':109 'x-payment':108 'x402':2,19,39,115,222 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"390c8173-deec-4fe7-83bb-9512b6c4caca","listingId":"865ef566-614d-4f48-b6ac-55da37743650","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:23.116Z"}],"sources":[{"listingId":"865ef566-614d-4f48-b6ac-55da37743650","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:23.116Z","lastSeenAt":"2026-04-26T11:04:13.714Z"}],"details":{"listingId":"865ef566-614d-4f48-b6ac-55da37743650","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/120 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/120"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/120"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade or financial data on a pay-per-request basis without API key management","Agent-driven workflows that need instant, keyless access to data endpoints","Prototyping integrations where per-call pricing avoids subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 micropayments on Base","Use cases requiring low-cost ($0.02) individual API calls"],"notFor":["High-volume consumers who need bulk/subscription pricing","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.932Z"},"updatedAt":"2026-04-26T11:04:13.714Z"}}