{"id":"4b0e7379-ff37-4314-80a4-b96732adbc33","shortId":"3YjnLJ","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 payment protocol on the Base network. This specific endpoint (`/api/v1/customers/99`) is described as \"Premium API Access\" and returns JSON data when a valid x402 payment header is supplied. Payment is settled in USDC (contract `0x8335…2913` on Base) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated entirely by the on-chain micropayment.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories—data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation)—all priced at $0.02 per call. However, this listing covers only the `/api/v1/customers/99` endpoint, which appears to be a customer-record lookup. The exact schema of the response body is not documented; the x402 challenge confirms the output MIME type is `application/json` and the HTTP method is POST.\n\nDocumentation on the site is extremely thin—most pages beyond the landing page render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no example request/response payloads, and no detailed field-level documentation available from the crawl. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","customer-data","no-api-key","micropayment"],"categories":["data","payments"],"synonyms":["customer lookup API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available; response format is unknown","All documentation pages beyond the landing page return only a 'Connect wallet' prompt with no content","The specific purpose and data returned by /api/v1/customers/99 is undocumented","No example requests or responses are available from the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/99","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/99","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, but there is no OpenAPI spec, no request/response schema, and documentation pages are empty beyond the landing page. The purpose of the /customers/99 endpoint is unclear beyond its generic 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'/request':17,34 '0.02':16,33,98,160 '000':93 '0x8335':83 '20':92 '2913':84 '402':254 '6':103 'Base network API' 'USDC micropayment API' 'access':45,64,113 'across':129 'advertis':112 'ai/ml':134 'analyt':133 'api':7,24,44,63,106 'appear':172 'application/json':199 'avail':245 'base':9,26,53,86,94 'beyond':215 'bodi':186 'broader':124 'call':4,21,162 'captur':256 'categori':131 'chain':121 'challeng':192,255 'classif':138 'collect':38 'confirm':193,252 'connect':222 'content':228 'contract':82 'convers':155 'cost':90 'cover':166 'crawl':248 'custom':5,22,177 'customer lookup API' 'customer-data' 'customer-record':176 'data':6,23,68,132 'decim':104 'describ':60 'detail':240 'document':189,206,244 'embed':139 'endpoint':57,128,170,250 'entir':116 'equal':97 'estim':149 'exact':181 'exampl':235 'exchang':144 'extrem':211 'feed':143 'field':242 'field-level':241 'financ':140 'gas':148 'gate':115 'generat':156 'geocod':153 'header':74 'host':36 'howev':163 'http':202 'infer':135 'infrastructur':151 'json':67 'json-api' 'key':107 'land':217 'level':243 'limit':110 'list':165 'live':253 'lookup':179 'lowpaymentfee' 'lowpaymentfee.com':35,125 'maximum':89 'method':203 'micropay':122 'micropayment' 'mime':196 'network':54 'no-api-key' 'offer':127 'on-chain':119 'openapi':232 'output':195 'page':214,218 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payload':237 'payment':49,73,77 'per':3,20,42,99,161 'platform':126 'post':205 'premium':62 'premium API access' 'price':142,158 'prompt':224 'protocol':50 'quot':147 'rate':109,145 'record':178 'render':219 'request':43,100 'request/response':236 'respons':185 'return':66 'schema':182 'sentiment':136 'settl':12,29,79 'sever':130 'site':209 'spec':233 'specif':56 'success':257 'summar':137 'suppli':76 'thin':212 'token':146 'type':197 'unit':95 'usdc':14,31,81,101 'usdc-base' 'use':102 'util':152 'valid':71,154 'via':10,27,46 'wallet':223 'web3':141 'x402':11,28,48,72,191 'x402 API' 'x402-payment'","prices":[{"id":"eb24d223-d52d-463c-9598-8f67861d3c8e","listingId":"4b0e7379-ff37-4314-80a4-b96732adbc33","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:46.308Z"}],"sources":[{"listingId":"4b0e7379-ff37-4314-80a4-b96732adbc33","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:46.308Z","lastSeenAt":"2026-04-25T03:02:24.772Z"}],"details":{"listingId":"4b0e7379-ff37-4314-80a4-b96732adbc33","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/99 \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/99"},{"claim":"All APIs 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/99"}],"useCases":["Retrieving customer record data on demand with per-call USDC micropayments","Agent-driven data retrieval without pre-provisioned API keys","Integrating pay-as-you-go customer data into automated workflows"],"bestFor":["Developers or agents needing keyless, pay-per-call API access","Use cases where on-chain USDC micropayments on Base are preferred over subscriptions","Prototyping or low-volume access to customer data without signup"],"notFor":["High-volume bulk data retrieval where per-call costs add up","Users who cannot transact in USDC on the Base network","Applications requiring detailed API documentation or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.77Z"},"updatedAt":"2026-04-25T03:02:24.772Z"}}