{"id":"fb2429dd-e2dc-4f13-b780-d59cdc542613","shortId":"3FpNMg","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/101` is labeled \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform lists endpoints across four categories: 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 advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation 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 crawl. The `/api/v1/charges/101` endpoint itself does not clearly map to any of the listed API categories, so its exact functionality beyond the \"Premium API Access\" label is unknown.","tags":[],"capabilities":["x402-payment-gating","usdc-base-settlement","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-gateway","data","llm"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definitions found","The exact functionality of /api/v1/charges/101 ('Premium API Access') is not described anywhere","No request or response examples available","The listed API categories (AI, analytics, finance, utils) are advertised but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/101","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/101","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, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the specific function of /api/v1/charges/101 is unclear beyond its 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'/api/v1/charges/101':57,195 '/docs':159 '/pricing':161 '/readme':163 '0.02':12,28,91,140 '000':81 '0x8335':69 '20':80 '2913':70 '6':86 'accept':64 'access':7,23,62,217 'across':99 'advertis':76,138 'ai':109 'ai-inference' 'analysi':113 'analyt':103 'api':6,22,42,61,145,207,216 'avail':190 'base':9,25,51,72,82 'base network api' 'beyond':213 'broader':95 'call':4,20 'categori':101,208 'challeng':75 'classif':116 'clear':200 'commit':153 'connect':169 'contract':68 'convers':133 'crawl':193 'data':102,106 'data-analytics' 'decim':87 'detail':176 'document':154,185 'embed':117 'endpoint':43,55,98,136,196 'equal':90 'estim':127 'exact':211 'exampl':189 'exchang':122 'export':107 'extrem':156 'feed':121 'financ':118 'finance-data' 'four':100 'function':212 'gas':126 'gate':44 'generat':134 'geocod':131 'infrastructur':129 'insight':108 'key':146 'label':59,218 'learn':111 'limit':149 'list':97,206 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':110 'map':201 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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/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:16.422Z"}],"sources":[{"listingId":"fb2429dd-e2dc-4f13-b780-d59cdc542613","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/101","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:16.422Z","lastSeenAt":"2026-04-23T19:01:03.372Z"}],"details":{"listingId":"fb2429dd-e2dc-4f13-b780-d59cdc542613","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/101 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/101"},{"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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates via x402"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing quick access to utility APIs without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.93Z"},"updatedAt":"2026-04-23T19:01:03.372Z"}}