{"id":"77c59288-066d-482e-950a-0f1cef5d537c","shortId":"WAjBDa","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/129` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request.\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 with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific behavior of `/api/v1/trades/129` (what trade data it returns or what input it expects) is not documented anywhere in the crawled material. The endpoint is live and returning a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-api","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["finance","llm","geo","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API","Base network API","trades API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/trades/129 is not listed on the homepage's API catalog — its purpose and expected input/output are unknown","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/129","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/129","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, but there is zero documentation on request/response schemas, no OpenAPI spec, and the specific endpoint's purpose (trades/129) is undocumented. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/trades/129':66,208 '/docs':172 '/pricing':174 '/readme':176 '/request':17,34,152 '0.02':16,33,100,151 '000':86 '0x8335':91 '20':85 '2913':92 '402':236 '6':97 'Base network API' 'USDC API' 'accept':74 'access':45,72 'advertis':80,106 'ai':10,27,118 'ai-inference' 'amount':83 'analysi':122 'analyt':112 'anywher':222 'api':4,21,41,71,110,157 'avail':203 'base':7,24,61,87,94 'behavior':206 'behind':51 'broader':104 'categori':108 'challeng':79,237 'classif':125 'commit':165 'connect':182 'convers':142 'crawl':225 'crypto-data' 'data':9,26,111,115,211 'data-analytics' 'decim':98 'detail':189 'document':167,198,221 'embed':126 'endpoint':14,31,50,65,145,228 'equal':99 'estim':136 'exampl':201 'exchang':131 'expect':218 'export':116 'extrem':169 'feed':130 'financ':11,28,127 'finance-data' 'four':107 'gas':135 'gate':3,20,44 'generat':143 'geocod':140 'infrastructur':138 'input':216 'insight':117 'key':158 'learn':120 'limit':161 'list':68,147 'live':230 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'materi':226 'maximum':82 'metric':113 'micropay':55 'minimum':164 'network':62 'offer':8,25 'openapi':193 'page':177 'pay-per-request API' 'payload':202 'per':53,101 'per-request':52 'per-request-micropayment' 'platform':5,22,42,105 'point':154 'post':75 'post-api' 'premium':70 'price':129,153 'prompt':184 'protocol':40 'quot':134 'rate':132,160 'render':179 'report':114 'request':54,76,102 'request/response':196 'requir':166 'return':213,232 'schema':197 'sentiment':121 'settl':56 'spars':170 'spec':194 'specif':64,205 'summar':124 'technic':188 'text':123 'token':133 'trade':210 'trades API' 'unit':88 'usdc':58,90 'usdc-base' 'util':13,30,139 'utility-services' 'valid':141,234 'varieti':48 'wallet':183 'web3':128 'x402':2,19,39,78,235 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"05f4dac1-f568-402f-9819-1d8fd1357299","listingId":"77c59288-066d-482e-950a-0f1cef5d537c","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/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:27.356Z"}],"sources":[{"listingId":"77c59288-066d-482e-950a-0f1cef5d537c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:27.356Z","lastSeenAt":"2026-04-23T00:32:16.876Z"}],"details":{"listingId":"77c59288-066d-482e-950a-0f1cef5d537c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/129 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/129"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data via a single micropayment without API key registration","Programmatic agents purchasing API responses on-the-fly using x402 protocol","Integrating low-cost data or AI endpoints into workflows without subscription overhead"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Prototyping and low-volume usage where subscriptions are overkill"],"notFor":["High-volume production workloads needing SLA guarantees and documented schemas","Users who need detailed API documentation or request/response examples before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.759Z"},"updatedAt":"2026-04-23T00:32:16.876Z"}}