{"id":"28906bdc-f781-4910-a3a6-0b7456e51275","shortId":"pfjGSm","kind":"x402","title":"Pay-per-request premium API access via x402 on Base, settled in USDC at $0.02/call.","tagline":"Pay-per-request premium API access via x402 on Base, settled in USDC at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header to each request and the server fulfills the call once payment is verified.\n\nThe specific endpoint at `/api/v1/charges/124` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse; the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There are no OpenAPI specs, request/response schemas, or usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/charges/124 is not described beyond the generic label 'Premium API Access'","The broader platform lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/124","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/charges/124","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 documentation, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/charges/124 beyond 'Premium API Access' is 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'/api/v1/charges/124':119 '/call':17,34 '/docs':213 '/pricing':215 '/readme':217 '0.02':16,33,67,146,200 '000':135 '0x8335':140 '20':134 '2913':141 '300':159 '6':150 'Base network API' 'USDC micropayment API' 'accept':164 'access':7,24,125 'across':53 'advertis':173 'ai/ml':56 'analysi':177 'analyt':55 'api':6,23,41,79,124 'application/json':169 'attach':96 'avail':241 'base':11,28,75,136,143 'base-network' 'beyond':205 'broad':45 'broader':171 'call':110 'caller':95 'catalog':46 'challeng':130 'classif':180 'commit':87 'connect':223 'content':245 'convers':192 'crawl':244 'crypto-paid API' 'data':54,194 'decim':151 'detail':230 'document':204 'embed':181 'enabl':40 'endpoint':52,63,117,163,174 'equal':145 'estim':189 'exact':156 'exampl':240 'exchang':184 'extrem':210 'feed':183 'finance/web3':58 'fulfil':108 'gas':188 'generat':195 'geocod':190 'given':147 'handl':92 'header':101 'howev':203 'infer':57 'infrastructur':60 'inlin':94 'json-response' 'key':80 'land':207 'limit':83 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'x402-payment'","prices":[{"id":"8f7c3a1d-091f-4c42-95f7-02c772d643df","listingId":"28906bdc-f781-4910-a3a6-0b7456e51275","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/charges/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:11.554Z"}],"sources":[{"listingId":"28906bdc-f781-4910-a3a6-0b7456e51275","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:11.554Z","lastSeenAt":"2026-04-24T05:02:30.779Z"}],"details":{"listingId":"28906bdc-f781-4910-a3a6-0b7456e51275","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/124 \\\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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/124"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off paid API calls from autonomous agents using x402 protocol","Integrating pay-per-request data or AI services into workflows settled on Base"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","x402-compatible clients that can attach inline USDC payments on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.15Z"},"updatedAt":"2026-04-24T05:02:30.779Z"}}