{"id":"72639c56-4574-41e4-89b4-00a57a79ea87","shortId":"HzcmPq","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/trades/27` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints across four 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 priced at $0.02 per request. However, the specific `/api/v1/trades/27` endpoint does not clearly map to any of these advertised categories, and no documentation describes what data or functionality it returns.\n\nThe endpoint is live and responds with a well-formed x402 challenge. Payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The method is POST and the response MIME type is `application/json`. Documentation pages beyond the landing page are effectively empty (showing only \"Connect wallet\"), so the actual response schema and input parameters for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["finance","data"],"synonyms":["trades API","premium API access","x402 trades endpoint","lowpaymentfee","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No documentation available for the /api/v1/trades/27 endpoint — its purpose and response format are unknown","The endpoint path '/api/v1/trades/27' does not appear in the site's advertised API catalog","All documentation pages (docs, pricing, README) render only a 'Connect wallet' prompt with no useful content","No input parameters or output schema are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/27","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/27","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 challenge, but there is no documentation on what /api/v1/trades/27 actually returns, no input/output schema, and no example responses. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The endpoint's purpose is 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'/request':13,28 '0.02':12,27,80,156 '000':74 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':201 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':204 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,94 'across':115 'actual':233 'address':200 'advertis':85,172 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,87 'application/json':217 'attach':97 'base':8,23,51,75,206 'beyond':220 'broader':110 'call':4,19,82 'caller':95 'categori':117,173 'challeng':67,196 'classif':132 'clear':166 'connect':229 'convers':149 'data':118,122,179 'describ':177 'document':176,218 'effect':225 'embed':133 'empti':226 'endpoint':55,114,152,163,185,241 'estim':143 'exchang':138 'export':123 'feed':137 'financ':134 'form':194 'four':116 'function':181 'gas':142 'generat':150 'geocod':147 'header':102 'howev':159 'i.e':79 'infrastructur':145 'input':237 'insight':124 'instant':93 'json-api' 'key':88 'land':222 'learn':127 'limit':91 'list':58 'live':187 'lowpaymentfee' 'lowpaymentfee.com':31,111 'machin':126 'map':167 'method':208 'metric':120 'mime':214 'network':9,24,52 'offer':113 'page':219,223 'paramet':238 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,101,107,197 'per':3,18,36,81,157 'platform':6,21,39,84,112 'post':210 'post-method' 'premium':60 'premium API access' 'price':136,154 'proof':108 'protocol':44 'quot':141 'rate':90,139 'report':121 'request':37,158 'requir':68 'respond':189 'respons':213,234 'return':64,183 'schema':235 'sentiment':128 'settl':198 'show':227 'simpli':96 'specif':54,161 'summar':131 'text':130 'token':140 'trades API' 'type':215 'unit':76 'unknown':243 'usdc':15,30,47,78,203 'usdc-base' 'use':41,202 'util':146 'valid':105,148 'via':10,25 'wallet':230 'web3':135 'well':193 'well-form':192 'x':100 'x-payment':99 'x402':11,26,43,106,195 'x402 trades endpoint' 'x402-payment'","prices":[{"id":"36cd34a8-51a6-416f-b937-c792543c35ce","listingId":"72639c56-4574-41e4-89b4-00a57a79ea87","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:51.500Z"}],"sources":[{"listingId":"72639c56-4574-41e4-89b4-00a57a79ea87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:51.500Z","lastSeenAt":"2026-04-26T04:03:40.890Z"}],"details":{"listingId":"72639c56-4574-41e4-89b4-00a57a79ea87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/27 \\\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/27"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/27"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data or functionality via a single paid API call","Integrating pay-per-use API access into agent workflows without API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents needing keyless, pay-per-call API access on Base","Projects that want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.679Z"},"updatedAt":"2026-04-26T04:03:40.890Z"}}