{"id":"3b0a6833-60be-4a27-bd06-e26357002cdc","shortId":"rD9Z3r","kind":"x402","title":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key generation on Base via x402 — $0.02 per 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 utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/apikeys/29` is listed as \"Premium API Access.\" Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is made 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 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind this specific endpoint and the other listed endpoints cannot be verified from the available information.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","api-key-generation","no-rate-limits"],"categories":["infrastructure","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","premium api key"],"warnings":["No OpenAPI specification or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific behavior of /api/v1/apikeys/29 ('Premium API Access') is undocumented — it is unclear what this endpoint returns","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/29","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/apikeys/29","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 USDC on Base), but there is zero documentation beyond the landing page listing. No OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind this endpoint is 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'0.02':12,28,63,128,174 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':123 '20':117 '300':142 '6':131 'accept':110 'access':103 'across':47 'actual':219 'address':138 'advertis':148 'ai':50 'analysi':152 'analyt':49 'api':5,21,39,74,102,184 'api-key-generation' 'attach':85 'avail':213,235 'base':9,25,71,104,119,125 'base network api' 'base-network' 'behind':221 'broader':146 'call':4,20 'caller':83 'cannot':230 'challeng':108 'charg':114 'classif':155 'commit':80 'connect':193 'content':199 'convers':167 'crawl':216 'data':48 'decim':132 'doc':183 'document':178,208 'embed':156 'enabl':38 'endpoint':46,59,95,149,224,229 'equal':127 'estim':164 'exampl':212 'exchang':159 'extrem':180 'feed':158 'financ':53 'function':220 'gas':163 'generat':7,23,169 'geocod':165 'header':89 'howev':177 'inform':236 'infrastructur':56 'key':6,22,75 'learn':52 'limit':77 'list':99,228 'low payment fee' 'lowpaymentfee.com':33 'machin':51 'made':136 'materi':217 '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/apikeys/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:27.145Z"}],"sources":[{"listingId":"3b0a6833-60be-4a27-bd06-e26357002cdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:27.145Z","lastSeenAt":"2026-04-22T12:04:51.589Z"}],"details":{"listingId":"3b0a6833-60be-4a27-bd06-e26357002cdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/29"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/29"},{"claim":"Platform advertises endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring API access keys via per-call micropayments without subscriptions","Programmatic access to data, AI, finance, and utility endpoints with no upfront commitment","Agent-driven API consumption where each call is independently settled on-chain"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that need to autonomously purchase API calls via x402","Users who prefer on-chain USDC settlement over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.261Z"},"updatedAt":"2026-04-22T12:04:51.589Z"}}