{"id":"d86ae7df-97eb-467f-a339-777f09923aa0","shortId":"zSLsek","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/customers/85` is listed as \"Premium API Access\" and returns JSON via POST. The x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nThe platform advertises a broad catalog of endpoints spanning 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 endpoints are listed at $0.02 per request. The probed endpoint's maxAmountRequired of 20000 base units (USDC has 6 decimals) equals $0.02, consistent with the advertised pricing.\n\nThe platform emphasizes simplicity: no API keys, no rate limits, no commitments, and instant access. However, documentation 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. The purpose and expected input/output of the `/api/v1/customers/85` endpoint specifically is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","USDC pay-per-call","Base network API","micropayment API","lowpaymentfee","crypto API gateway","402 payment protocol"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema specification found for any endpoint.","The purpose and expected input/output of /api/v1/customers/85 ('Premium API Access') is undocumented and unclear.","The broader catalog of endpoints (AI, analytics, finance, utils) listed on the homepage could not be verified or documented beyond their names and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/85","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of the /api/v1/customers/85 endpoint is entirely opaque. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/customers/85':56,217 '/docs':178 '/pricing':180 '/readme':182 '/request':13,28 '0.02':12,27,134,151 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':80 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':84 '20000':143 '402 payment protocol' '6':148 'Base network API' 'USDC pay-per-call' 'accept':46,76 'access':62,171,227 'address':79 'advertis':89,155 'ai':103 'analysi':107 'analyt':97 'api':5,20,38,61,162,226 'avail':209 'base':8,23,51,86,144 'beyond':222 'broad':91 'call':4,19 'catalog':92 'challeng':70 'classif':110 'commit':168 'confirm':71 'connect':188 'consist':152 'contract':83 'convers':127 'crypto API gateway' 'data':96,100 'decim':149 'detail':195 'document':173,204 'embed':111 'emphas':159 'endpoint':55,73,94,130,139,218 'equal':150 'estim':121 'exampl':208 'exchang':116 'expect':213 'export':101 'extrem':175 'feed':115 'financ':112 'gas':120 'generat':128 'generic':224 'geocod':125 'howev':172 'infrastructur':123 'input/output':214 'insight':102 'instant':170 'json':65 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'x402-payment'","prices":[{"id":"d0752616-bede-4474-a93f-3e8899540402","listingId":"d86ae7df-97eb-467f-a339-777f09923aa0","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:31.895Z"}],"sources":[{"listingId":"d86ae7df-97eb-467f-a339-777f09923aa0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:31.895Z","lastSeenAt":"2026-04-22T05:30:40.880Z"}],"details":{"listingId":"d86ae7df-97eb-467f-a339-777f09923aa0","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/customers/85\n# 2. Parse the 402 response, construct an X-PAYMENT header\n#    with a signed USDC transfer of 20000 base units ($0.02),\n#    then resend the request with that header.","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 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/85"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/85"}],"useCases":["Accessing premium data or services with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic access to a customer resource endpoint with crypto settlement"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may not be economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.672Z"},"updatedAt":"2026-04-22T05:30:40.880Z"}}