{"id":"d9ea3d21-1575-4e7d-b84e-6690650dbf0b","shortId":"GQXYhY","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 marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/21` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys or rate limits required.\n\nThe 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). All listed endpoints share the same $0.02/request pricing. The platform emphasizes a no-signup, pay-per-use model with instant access.\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 specific behavior of the `/api/v1/products/21` endpoint beyond its x402 challenge is unknown; it may serve as a catalog or product detail endpoint, but this is unconfirmed.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only a wallet-connect prompt","The specific purpose and response format of /api/v1/products/21 ('Premium API Access') is undocumented and unknown","No request body schema or response examples are available from any source","Platform appears new or minimally documented; reliability and data quality are unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/21","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/products/21","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 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality of /api/v1/products/21 is unclear. Score reflects a near-stub level of available 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'/api/v1/products/21':65,220 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34,158 '0.02':16,33,86,157 '000':80 '20':79 '402':74 '402 payment api' '6':90 'access':70,174 'advertis':113 'ai':10,27,125 'ai-inference' 'analysi':129 'analyt':119 'api':4,21,41,69,104 'avail':211 'base':7,24,59,81 'base usdc api' 'base-network' 'behavior':217 'behind':49 'beyond':222 'broader':111 'call':93 'catalog':233 'categori':115 'challeng':75,225 'classif':132 'connect':190 'convers':149 'crawl':214 'data':9,26,118,122 'data-analytics' 'decim':91 'detail':197,236 'document':175,206 'embed':133 'emphas':162 'endpoint':14,31,48,63,117,153,221,237 'estim':143 'exact':100 'exampl':210 'exchang':138 'export':123 'extrem':177 'feed':137 'financ':11,28,134 'finance-data' 'four':114 'gas':142 'gate':3,20,44 'generat':150 'geocod':147 'given':87 'i.e':85 'infrastructur':145 'insight':124 'instant':173 'key':105 'label':67 'learn':127 'limit':108 'list':152 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'made':96 'marketplac':42 'may':229 'metric':120 'micropay':53 'micropayment api' 'model':171 'network':60 'no-api-key' 'no-signup':164 'offer':8,25 'openapi':201 'page':185 'pay':168 'pay-per-request api' 'pay-per-us':167 'payment':94 'per':51,92,169 'per-request':50 'per-request-billing' 'platform':5,22,112,161 'premium':68 'price':136,159 'product':235 'prompt':192 'protocol':40 'quot':141 'rate':107,139 'render':187 'report':121 'request':52,76 'request/response':204 'requir':109 'return':72 'schema':205 'scheme':101 'sentiment':128 'serv':230 'settl':54 'share':154 'signup':166 'spars':178 'spec':202 'specif':62,216 'summar':131 'technic':196 'text':130 'token':140 'unconfirm':241 'unit':82 'unknown':227 'usag':209 'usdc':56,84,88 'usdc-micropayment' 'use':170 'util':13,30,146 'utility-services' 'valid':148 'varieti':46 'via':97 'wallet':191 'web3':135 'x402':2,19,39,99,224 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"bf741baf-8c70-4969-ad46-2ac04a270611","listingId":"d9ea3d21-1575-4e7d-b84e-6690650dbf0b","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/products/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:37.904Z"}],"sources":[{"listingId":"d9ea3d21-1575-4e7d-b84e-6690650dbf0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:37.904Z","lastSeenAt":"2026-04-23T12:05:07.974Z"}],"details":{"listingId":"d9ea3d21-1575-4e7d-b84e-6690650dbf0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/21 \\\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 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/products/21"},{"claim":"All listed endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand access to analytics, AI, or finance data without managing API keys or subscriptions","Programmatic micropayment-gated data retrieval on Base L2","Quick utility lookups (geocoding, validation, conversion) paid per call in USDC"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible agents that can settle USDC on Base","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users who need detailed API documentation or response schema before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.389Z"},"updatedAt":"2026-04-23T12:05:07.974Z"}}