{"id":"7cec2375-5d18-4c78-aafb-cfa7f5ed0276","shortId":"vhMqe5","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. Payment is handled via the x402 protocol: callers receive a 402 challenge and settle with an on-chain USDC micro-payment.\n\nThe specific endpoint probed (`/api/v1/transfers/123`) is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation services. All share the same $0.02 flat pricing.\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 usage examples available from the crawl. The actual functionality behind each endpoint cannot be verified from the available material, so callers should treat this as an exploratory integration until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","micro-transaction endpoint"],"warnings":["No OpenAPI specification or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific endpoint /api/v1/transfers/123 is labeled 'Premium API Access' but its actual functionality is undocumented","Cannot verify that the advertised AI, finance, data, and utility endpoints actually deliver the described functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/123","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/transfers/123","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 with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind each listed endpoint is unverifiable from available 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'/api/v1/transfers/123':118 '/docs':187 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,70,140,179 '000':135 '20':134 '402':101 '6':145 'Base network API' 'USDC API' 'access':124 'actual':223 'addit':152 'advertis':151 'ai':12,31,57 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':156 'analyt':56 'api':5,24,45,82,123 'avail':218,233 'base':8,27,78,136,148 'behind':225 'broad':50 'call':4,23 'caller':98,236 'cannot':228 'catalog':51 'chain':109 'challeng':102,130 'classif':159 'commit':89 'connect':197 'convers':171 'conversion' 'cover':10,29 'crawl':221 'crypto-gas-estimates' 'data':11,30,55 'data-analytics' 'decim':146 'detail':204 'document':182,213,246 'embed':160 'enabl':44 'endpoint':16,35,53,66,116,153,227 'estim':168 'exampl':217 'exchang':163 'exchange-rates' 'exploratori':242 'extrem':184 'feed':162 'financ':13,32,60 'finance-price-feeds' 'flat':180 'function':224 'gas':167 'generat':173 'geocod':169 'geocoding' 'handl':93 'includ':154 'infrastructur':63 'integr':243 'key':83 'learn':59 'limit':86 'list':120 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'materi':234 'micro':112 'micro-pay':111 'micro-transaction endpoint' 'micropayment API' 'network':79 'offer':48 'on-chain':107 'openapi':208 'page':192 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payabl':73 'payment':91,113 'per':3,22,71 'platform':6,25,46,150 'premium':122 'price':68,161,181 'probe':117 'prompt':199 'protocol':97 'quot':166 'rate':85,164 'receiv':99 'render':194 'request':72,131 'request/response':211 'requir':90 'return':126 'schema':212 'sentiment':155 'servic':174 'settl':104 'share':176 'sinc':142 'span':54 'spars':185 'spec':209 'specif':115 'summar':158 'surfac':247 'technic':203 'text':157 'token':165 'treat':238 'unit':137 'usag':216 'usd':141 'usdc':9,28,75,110,139,143 'usdc-base-network' 'use':144 'util':15,34,64 'valid':128,170 'validation' 'verifi':230 'via':94 'wallet':198 'web3':61 'x402':43,96,129 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e5f9aa3f-2eaa-4617-9114-6175a02e382c","listingId":"7cec2375-5d18-4c78-aafb-cfa7f5ed0276","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/transfers/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:16.100Z"}],"sources":[{"listingId":"7cec2375-5d18-4c78-aafb-cfa7f5ed0276","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:16.100Z","lastSeenAt":"2026-04-22T10:32:25.546Z"}],"details":{"listingId":"7cec2375-5d18-4c78-aafb-cfa7f5ed0276","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns x402 challenge requesting maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/123"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time financial price feeds and exchange rates without an API key","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching gas estimates and token quotes for crypto applications","Geocoding addresses or validating data through utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agent-based workflows that can settle USDC payments on Base via x402","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.522Z"},"updatedAt":"2026-04-22T10:32:25.546Z"}}