{"id":"3461b3d9-00e2-4051-8861-7bc4348eedf0","shortId":"zE32xu","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment wall. The specific resource `/api/v1/customers/27` appears to be a customer data endpoint, though its exact response payload is undocumented. The provider's site advertises a broad suite of APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge captured from the probe shows a `maxAmountRequired` of 20000 (in USDC's 6-decimal representation, this equals $0.02), consistent with the site's advertised flat rate of $0.02 per request. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through x402 payment headers.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/customers/27` resource actually returns. The endpoint is confirmed live (402 challenge captured successfully), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-request-billing","json-response","post-method","no-api-key","customer-data"],"categories":["data","api-gateway"],"synonyms":["premium API","pay-per-request API","x402 API","USDC API","Base network API","lowpaymentfee","customer endpoint","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific resource /api/v1/customers/27 is not listed among the advertised APIs on the homepage, making its purpose unclear","Cannot verify what data is returned or what request body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/27","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/customers/27 resource returns. The docs pages are all empty 'Connect wallet' stubs. This is effectively a stub 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'0.02':130,140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20000':121 '402':212 '6':125 'Base network API' 'USDC API' 'accept':145 'access':6,20,36,159 'actual':205 'advertis':64,136,158 'ai/ml':73 'analysi':75 'analyt':72 'api':5,19,35,69,152,174 'appear':46 'application/json':150 'back':232 'base':8,22,105 'base-network' 'behind':37 'broad':66 'captur':113,214 'challeng':112,213 'classif':77 'confirm':210 'connect':182 'consist':131 'content':188 'contract':109 'convers':94 'custom':50 'customer endpoint' 'customer-data' 'data':51,71,227 'decim':126 'descript':199 'difficult':223 'doc':172 'document':167,220 'embed':78 'endpoint':30,52,144,208 'equal':129 'estim':88 'exact':55 'exampl':196 'exchang':83 'expect':231 'extrem':169 'feed':82 'financ':79 'flat':137 'gas':87 'gate':3,17 'generat':95 'geocod':92 'grant':161 'handl':98 'header':166 'infrastructur':90 'json-response' 'key':153 'know':225 'lack':218 'limit':156 'live':211 'lowpaymentfee' 'lowpaymentfee.com':32 'make':221 'maxamountrequir':119 'micropayment API' 'network':106 'no-api-key' 'openapi':192 'page':177 'paid':9,23 'pay-per-request API' 'payload':57 'payment':40,96,165 'per':11,25,141 'per-request':10,24 'per-request-billing' 'post':146 'post-method' 'premium':4,18,34 'premium API' 'price':81,173 'probe':116 'prompt':184 'protocol':102 'provid':33,61 'pure':162 'quot':86 'rate':84,138,155 'readm':176 'render':179 'represent':127 'request':12,26,142,147 'request/response':195 'resourc':44,204 'respons':56 'return':149,206 'schema':193 'send':229 'sentiment':74 'show':117 'site':63,134 'span':70 'spars':170 'specif':43 'substant':187 'success':215 'suit':67 'summar':76 'though':53 'token':85 'undocu':59 'usdc':14,28,108,123 'usdc-payment' 'use':107 'util':91 'valid':93 'via':99 'wall':41 'wallet':183 'web3':80 'x402':2,16,39,101,164 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"72245428-097a-4e07-a656-3c76e10a3585","listingId":"3461b3d9-00e2-4051-8861-7bc4348eedf0","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:18.348Z"}],"sources":[{"listingId":"3461b3d9-00e2-4051-8861-7bc4348eedf0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:18.348Z","lastSeenAt":"2026-04-24T13:31:32.278Z"}],"details":{"listingId":"3461b3d9-00e2-4051-8861-7bc4348eedf0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/27 \\\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 USDC units on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/27"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing customer data records behind a per-request paywall","Programmatic agent-driven API consumption without API key management","Paying for individual API calls using USDC on Base"],"bestFor":["Agents that can handle x402 payment flows on Base","Use cases requiring keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments"],"notFor":["Users needing well-documented API contracts with request/response schemas","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.075Z"},"updatedAt":"2026-04-24T13:31:32.278Z"}}