{"id":"8056e8a2-de2b-41c0-8548-9b5e8910845f","shortId":"7dEh6L","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/96` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The response MIME type is application/json. The broader platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 usage examples available from the crawled material. The purpose of the `/api/v1/customers/96` endpoint specifically is unclear — the generic \"Premium API Access\" label and the path structure (customers/{id}) suggest it may return customer data, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI spec or schema documentation available","The purpose of /api/v1/customers/96 ('Premium API Access') is ambiguous — the path suggests customer data but no details are provided","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content","No example requests or responses available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/96","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/96","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, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/customers/96 is unclear. The docs/pricing/README pages are all empty beyond a wallet connect 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'/request':13,30 '0.02':12,29,66,133,171 '000':122 '0x8335':127 '20':121 '2913':128 '402 payment API' '6':137 'Base network API' 'USDC micropayment API' 'accept':111 'access':109,227 'across':49 'advertis':117,149 'ai':52 'also':148 'analysi':153 'analyt':51 'api':5,15,22,32,41,80,108,181,226 'application/json':144 'attach':91 'avail':209 'base':8,25,74,123,130 'broader':146 'call':4,21 'caller':89 'categori':60 'challeng':116 'classif':156 'commit':88 'connect':189 'content':195 'convers':164 'crawl':212 'crypto-paid API' 'custom':233,239 'data':50,240 'decim':138 'doc':179 'document':174,204 'embed':157 'enabl':40 'endpoint':48,62,101,150,219 'equal':132 'exampl':208 'exchang':160 'extrem':176 'feed':159 'financ':55 'generic':224 'geocod':162 'given':134 'header':95 'id':234 'infrastructur':58 'json-response' 'key':16,33,81 'label':228 'learn':54 'limit':84 'list':105 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':53 'materi':213 'maxamountrequir':119 'may':237 'mime':141 'network':75 'no-api-key' 'offer':44 'openapi':199 'page':184 'path':231 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':94 'per':3,20,67 'platform':6,23,42,77,147 'point':173 'post':112 'post-method' 'premium':107,225 'price':64,158,172,180 'prompt':191 'purpos':215 'rate':83,161 'readm':183 'render':186 'request':68,98,113 'request/response':202 'requir':17,34,78 'respons':140 'return':238 'schema':203 'sentiment':152 'settl':69 'simpli':90 'spars':177 'spec':200 'specif':100,220 'specul':244 'structur':232 'suggest':235 'summar':155 'text':154 'type':142 'unclear':222 'unit':124 'upfront':87 'usag':207 'usdc':9,26,71,126,135 'usdc-base-network' 'util':59 'valid':163 'varieti':46 'via':10,27 'wallet':190 'web3':56 'x402':11,28,39,93,115 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"bea96aaf-1d49-4aec-a037-7e6714c8b068","listingId":"8056e8a2-de2b-41c0-8548-9b5e8910845f","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:42.165Z"}],"sources":[{"listingId":"8056e8a2-de2b-41c0-8548-9b5e8910845f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:42.165Z","lastSeenAt":"2026-04-25T04:02:28.319Z"}],"details":{"listingId":"8056e8a2-de2b-41c0-8548-9b5e8910845f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/96 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/96"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic data retrieval without subscription commitments"],"bestFor":["Developers wanting zero-setup API access with crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.931Z"},"updatedAt":"2026-04-25T04:02:28.319Z"}}