{"id":"4da2da09-cb86-4c22-a072-a534a3f68a7b","shortId":"Xv6qJP","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/charges/55` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header containing a signed payment.\n\nThe broader platform advertises multiple API categories including 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. However, the specific endpoint being listed here (`/api/v1/charges/55`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog, so its exact functionality is unclear.\n\nPayments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the \"exact\" payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["The endpoint /api/v1/charges/55 does not appear in the site's public API catalog — its actual functionality is unknown.","No documentation, OpenAPI spec, or request/response examples are available.","All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.","The exact behavior behind 'Premium API Access' is unspecified — callers cannot know what data or service they are paying for."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/charges/55 is not described anywhere on the site. The docs, pricing, and API pages all render only a 'Connect wallet' prompt with no useful 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'/request':13,28 '0.02':12,27,65,147 '000':69 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':191 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':195 '20':68 '300':206 '402 payment api' '6':75 'accept':46,211 'access':62,164 'address':190 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,78,106,163,174 'appear':168 'application/json':216 'base':8,23,51,70,186 'base network api' 'broader':102 'call':4,19,67 'catalog':175 'categori':107 'challeng':198 'classif':123 'contain':97 'contract':194 'convers':140 'cost':64 'data':109,113 'decim':76 'embed':124 'endpoint':55,143,153,210 'estim':134 'exact':178,201 'exchang':129 'export':114 'feed':128 'financ':125 'function':179 'gas':133 'generat':141 'generic':160 'geocod':138 'header':96 'howev':150 'includ':108 'individu':90 'infrastructur':136 'insight':115 'json-response' 'key':79 'l2':187 'label':159 'learn':118 'limit':81 'list':58,145,155 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment api' 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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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:33.841Z"}],"sources":[{"listingId":"4da2da09-cb86-4c22-a072-a534a3f68a7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:33.841Z","lastSeenAt":"2026-04-24T10:32:39.025Z"}],"details":{"listingId":"4da2da09-cb86-4c22-a072-a534a3f68a7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/55"},{"claim":"Platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/55"}],"useCases":["Programmatic access to premium API functionality with per-call USDC payments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume use cases where per-call crypto settlement overhead matters","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.211Z"},"updatedAt":"2026-04-24T10:32:39.025Z"}}