{"id":"1c98d9ed-c53c-4da7-a5d5-d5888eda7800","shortId":"8efRzb","kind":"x402","title":"Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request APIs accessible via the x402 protocol on the Base network. The specific endpoint `/api/v1/customers/9` is described as \"Premium API Access\" and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe broader platform advertises endpoints across several categories: 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 are listed at the same $0.02/request price point. However, the specific `/api/v1/customers/9` endpoint does not clearly map to any of these advertised categories — it appears to be a customer record lookup, though no documentation explains its request or response schema.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no description of what the customers endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","customer data endpoint","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /docs, /api, /pricing, and /README pages contain no useful content (only 'Connect wallet')","The purpose of /api/v1/customers/9 is unclear — it does not match any of the advertised API categories","No request body schema or response examples are provided anywhere","Cannot verify what data this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/9","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/9","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 with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /customers/9 endpoint's purpose is unexplained. This is effectively a stub 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'/api/v1/customers/9':57,170 '/docs':204 '/pricing':206 '/readme':208 '/request':17,34,164 '0.02':16,33,88,163 '000':83 '0x8335':73 '20':82 '2913':74 '402':244 '402 payment API' '6':93 'Base network API' 'USDC micropayment API' 'access':45,63 'across':121 'actual':237 'advertis':119,180 'ai':131 'amount':80 'analysi':135 'analyt':125 'api':7,24,44,62,96 'appear':183 'attach':107 'back':263 'base':9,26,52,76,84 'base-network' 'broader':117 'call':4,21 'caller':105 'captur':246 'categori':123,181 'challeng':245 'classif':138 'clear':174 'collect':38 'commit':102 'confirm':242 'connect':214 'content':220 'contract':72 'convers':155 'custom':5,22,187,235 'customer data endpoint' 'data':6,23,124,128,258 'decim':94 'describ':59 'descript':231 'difficult':254 'document':192,199,251 'embed':139 'endpoint':56,120,171,236,240 'equal':87 'estim':149 'exampl':228 'exchang':144 'expect':262 'explain':193 'export':129 'extrem':201 'feed':143 'financ':140 'gas':148 'generat':156 'geocod':153 'header':111 'host':36 'howev':167 'infrastructur':151 'insight':130 'json':66 'json-response' 'key':97 'know':256 'lack':249 'learn':133 'limit':99 'list':159 'live':243 'lookup':189 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'make':252 'map':175 'maximum':79 'metric':126 'network':53 'no-api-key' 'openapi':224 'page':209 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':67,110 'per':3,20,42,89 'platform':118 'point':166 'post':114 'post-method' 'premium':61 'price':142,165 'prompt':216 'protocol':49 'quot':147 'rate':98,145 'record':188 'render':211 'report':127 'request':43,90,115,195 'request/response':227 'requir':104 'respons':197 'return':65,238 'schema':198 'send':260 'sentiment':134 'settl':12,29,69 'sever':122 'simpli':106 'spars':202 'spec':225 'specif':55,169 'substant':219 'summar':137 'text':136 'though':190 'token':146 'unit':85 'upfront':101 'usdc':14,31,71,91 'usdc-settlement' 'use':92 'util':152 'valid':154 'via':10,27,46 'wallet':215 'web3':141 'x402':11,28,48,109 'x402 API' 'x402-payment'","prices":[{"id":"258ec8bb-3f6f-42c8-a4bf-e40e5087aa48","listingId":"1c98d9ed-c53c-4da7-a5d5-d5888eda7800","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:08.844Z"}],"sources":[{"listingId":"1c98d9ed-c53c-4da7-a5d5-d5888eda7800","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:08.844Z","lastSeenAt":"2026-04-23T16:30:38.794Z"}],"details":{"listingId":"1c98d9ed-c53c-4da7-a5d5-d5888eda7800","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/9 \\\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 with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/9"},{"claim":"All APIs are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/9"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching customer record data with per-request USDC micropayments","Agent-driven data retrieval without pre-registration or API keys","Programmatic access to paid endpoints using x402 protocol on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC","Low-volume callers who want no subscription or commitment"],"notFor":["Production workloads requiring documented request/response schemas","High-volume use cases where $0.02/request adds up without bulk discounts","Users who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.77Z"},"updatedAt":"2026-04-23T16:30:38.794Z"}}