{"id":"3e23d151-0046-42a5-b08e-5e5beaceda94","shortId":"RDGnLm","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 at `/api/v1/customers/23` 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-commitment, 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 `/api/v1/customers/23` endpoint's purpose is unclear from the available material; the name \"Premium API Access\" is generic and the path suggests a customer record lookup, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","Base USDC API","pay-per-request API","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet connect prompt","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/customers/23 has an unclear purpose; 'Premium API Access' is a generic label","Cannot verify that the advertised AI, finance, and utility endpoints actually function — only the customers/23 endpoint was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/23","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/customers/23","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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/customers/23 endpoint is unclear. Most pages on the site render only a wallet-connect prompt with no 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'/api/v1/customers/23':66,218 '/docs':181 '/pricing':183 '/readme':185 '/request':17,34,159 '0.02':16,33,87,158 '000':81 '20':80 '402':75 '402 payment API' '6':91 'Base USDC API' 'access':44,71,175,232 'advertis':114 'ai':10,27,126 'ai-inference' 'analysi':130 'analyt':120 'api':4,21,40,70,105,231 'avail':212,226 'base':7,24,60,82 'behind':50 'broader':112 'call':94 'categori':116 'challeng':76 'classif':133 'classification' 'commit':167 'connect':191 'convers':150 'crawl':215 'custom':240 'data':9,26,119,123 'data-analytics' 'decim':92 'detail':198 'document':176,207 'embed':134 'embeddings' 'emphas':163 'endpoint':14,31,49,64,118,154,219 'estim':144 'exact':101 'exampl':211 'exchang':139 'export':124 'extrem':178 'feed':138 'financ':11,28,135 'finance-data' 'four':115 'gas':143 'gate':3,20,43 'generat':151 'generic':234 'geocod':148 'geocoding' 'given':88 'i.e':86 'infrastructur':146 'insight':125 'instant':174 'key':106 'label':68 'learn':128 'limit':109 'list':153 'lookup':242 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':127 'made':97 'materi':227 'metric':121 'micropay':54 'model':172 'name':229 'network':61 'no-commit':165 'offer':8,25 'openapi':202 'page':186 'path':237 'pay':169 'pay-per-request API' 'pay-per-us':168 'payment':95 'per':52,93,170 'per-request':51 'per-request-micropayment' 'platform':5,22,41,113,162 'premium':69,230 'price':137,160 'prompt':193 'protocol':39 'purpos':221 'quot':142 'rate':108,140 'record':241 'render':188 'report':122 'request':53,77 'request/response':205 'requir':110 'return':73 'schema':206 'scheme':102 'sentiment':129 'sentiment-analysis' 'settl':55 'share':155 'spars':179 'spec':203 'specif':63,217 'specul':246 'suggest':238 'summar':132 'technic':197 'text':131 'text-summarization' 'token':141 'unclear':223 'unit':83 'usag':210 'usdc':57,85,89 'usdc-base' 'use':171 'util':13,30,147 'utility-apis' 'valid':149 'varieti':47 'via':98 'wallet':192 'web3':136 'x402':2,19,38,100 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5f6fa63a-fd2a-4f80-b49e-b321238ee346","listingId":"3e23d151-0046-42a5-b08e-5e5beaceda94","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/customers/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:32.780Z"}],"sources":[{"listingId":"3e23d151-0046-42a5-b08e-5e5beaceda94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:32.780Z","lastSeenAt":"2026-04-23T12:30:47.937Z"}],"details":{"listingId":"3e23d151-0046-42a5-b08e-5e5beaceda94","quickStartSnippet":"# x402 challenge: POST to the endpoint, include X-PAYMENT header with payment proof\ncurl -X POST https://lowpaymentfee.com/api/v1/customers/23 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; pay 0.02 USDC on Base to proceed","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/customers/23","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/customers/23 endpoint returns a 402 challenge requesting 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/23"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with micropayment-gated access","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions","x402-compatible AI agents that can autonomously pay for API calls on Base"],"notFor":["Users who need detailed API documentation, request/response schemas, or SLA guarantees","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.476Z"},"updatedAt":"2026-04-23T12:30:47.937Z"}}