{"id":"a138ed55-cebc-4aba-ae32-e42f9c88c400","shortId":"Syegg7","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 an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/charges/377` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 generation — all at the same $0.02/request 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 is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","post-endpoint","no-api-key","no-rate-limits"],"categories":["api-platform","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 content","The specific functionality of /api/v1/charges/377 ('Premium API Access') is not described anywhere","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/377","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/377","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, confirming it accepts payments. However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The purpose of this specific '/charges/377' endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/charges/377':86 '/docs':184 '/pricing':186 '/readme':188 '/request':13,28,171 '0.02':12,27,117,170 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':111 '20':105 '2913':112 '300':138 '6':122 'Base network API' 'USDC micropayment API' 'accept':94 'access':92 'across':45 'address':134 'advertis':144 'ai':48 'analysi':148 'analyt':47 'api':5,20,37,72,91 'avail':215 'base':8,23,68,107,114 'beyond':176 'broader':142 'call':4,19 'categori':56 'challeng':99 'classif':151 'commit':80 'connect':194 'convers':163 'cost':103 'crawl':218 'crypto-paid API' 'data':46 'decim':123 'detail':201 'document':175,210 'embed':152 'enabl':36 'endpoint':44,58,84,145 'equal':116 'estim':160 'exact':130 'exampl':214 'exchang':155 'extrem':181 'feed':154 'financ':51 'gas':159 'generat':165 'geocod':161 'howev':174 'indic':100 'infrastructur':54 'key':73 'land':178 'learn':50 'limit':76 'list':88 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':126 'materi':219 'maximum':102 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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/377","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:25.345Z"}],"sources":[{"listingId":"a138ed55-cebc-4aba-ae32-e42f9c88c400","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/377","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:25.345Z","lastSeenAt":"2026-04-24T12:03:23.057Z"}],"details":{"listingId":"a138ed55-cebc-4aba-ae32-e42f9c88c400","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/377 \\\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/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","source_url":"https://lowpaymentfee.com/api/v1/charges/377"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating x402-compatible endpoints into crypto-native applications"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.582Z"},"updatedAt":"2026-04-24T12:03:23.057Z"}}