{"id":"a61d178d-b507-47b5-ab1c-52dfeb16e220","shortId":"CdpGzL","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a multi-category API platform that gates access via the x402 payment protocol on the Base network, settling in USDC. The specific endpoint `/api/v1/trades/11` is listed under \"Premium API Access\" and accepts POST requests. The 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).\n\nThe probed endpoint returns a valid x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x8335…on Base, 6 decimals), which equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, and no minimum commitments. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/trades/11` endpoint actually returns. The endpoint's purpose (\"trades\" with an ID of 11) is unclear from the available material, and the generic title \"Premium API Access\" does not clarify its function.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","post-endpoint","no-api-key","json-response"],"categories":["finance","data","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-call 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 purpose of /api/v1/trades/11 is unknown; 'Premium API Access' is a generic label that does not describe functionality.","No request body schema or response schema is documented or inferrable.","No OpenAPI or ai-plugin manifest found.","Cannot verify what data or service is actually delivered upon payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/11","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/11","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 challenge, confirming pricing ($0.02 USDC on Base) and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the /trades/11 endpoint actually does. The docs pages are empty. This is effectively a stub 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'/api/v1/trades/11':59,207 '/docs':175 '/pricing':177 '/readme':179 '/request':16,32,143 '0.02':15,31,135,142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x8335':128 '11':220 '20000':123 '6':131 'Base USDC API' 'accept':67 'access':43,65,233 'across':145 'actual':209 'address':168 'advertis':73,140 'ai':9,25,85 'analysi':89 'analyt':8,24,79 'api':4,20,39,64,150,232 'avail':225 'base':7,23,51,124,130 'base-network' 'broader':71 'categori':38,75 'challeng':118 'clarifi':236 'classif':92 'commit':158 'connect':185 'content':191 'convers':109 'data':78,82 'decim':132 'document':170,200 'embed':93 'endpoint':13,29,58,77,113,147,208,212 'equal':134 'estim':103 'exact':165 'exampl':203 'exchang':98 'export':83 'extrem':172 'feed':97 'financ':10,26,94 'four':74 'function':238 'gas':102 'gate':3,19,42 'generat':110 'generic':229 'geocod':107 'id':218 'infrastructur':105 'insight':84 'json-response' 'key':151 'learn':87 'limit':154 'list':61 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':86 'made':161 'materi':226 'maxamountrequir':121 'metric':80 'micropayment API' 'minimum':157 'multi':37 'multi-categori':36 'network':52 'no-api-key' 'openapi':195 'page':180 'pay-per-call API' 'payment':47,159 'per':136 'per-request-pricing' 'platform':40,72,139 'post':68 'post-endpoint' 'premium':63,231 'price':96,144 'probe':112 'prompt':187 'protocol':48 'purpos':214 'quot':101 'rate':99,153 'render':182 'report':81 'request':69,137 'request/response':198 'return':114,210 'schema':199 'scheme':166 'sentiment':88 'settl':53 'spars':173 'spec':196 'specif':57 'suit':5,21 'summar':91 'text':90 'titl':230 'token':100 'trade':215 'trades endpoint' 'unclear':222 'uniform':141 'unit':125 'usdc':55,127 'usdc-settlement' 'util':12,28,106 'valid':108,116 'via':44,162 'wallet':186 'web3':95 'x402':2,18,46,117,164 'x402 trades API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"0e164cc0-4e77-4212-821a-39403748fb57","listingId":"a61d178d-b507-47b5-ab1c-52dfeb16e220","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:30.356Z"}],"sources":[{"listingId":"a61d178d-b507-47b5-ab1c-52dfeb16e220","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:30.356Z","lastSeenAt":"2026-04-22T15:02:07.442Z"}],"details":{"listingId":"a61d178d-b507-47b5-ab1c-52dfeb16e220","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/11 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/11"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/11"},{"claim":"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":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or executing trade-related queries via a single micropayment","Integrating pay-per-request API calls into agent workflows without API key management","Programmatic access to a trades resource settled on Base L2 in USDC"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Use cases requiring low-friction micropayments on Base","Scenarios where no subscription or rate-limit management is desired"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone needing clarity on what the /trades/11 endpoint actually returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.648Z"},"updatedAt":"2026-04-22T15:02:07.442Z"}}