{"id":"26f09bc5-1173-4acb-89b1-6666aa874e4e","shortId":"bZ42eB","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 utility categories. 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/60` 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 (0.02 USD, since USDC uses 6 decimals) per call on the Base network. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint returns `application/json`.\n\nThe broader platform advertises additional endpoints including 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 pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","json-response","no-auth-required"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) contain no substantive content — only a 'Connect wallet' prompt.","No request body schema or response schema is documented for this endpoint.","The exact functionality of /api/v1/apikeys/60 ('Premium API Access') is not explained anywhere in the crawled material.","The broader platform lists many endpoints (AI, finance, utils) but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/60","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/60","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 with clear pricing. However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty (showing only 'Connect wallet'). The purpose of the specific /api/v1/apikeys/60 endpoint is unclear beyond its title 'Premium API 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'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':89,138,147 'per':3,13,19,29,65,131 'platform':40,155 'point':185 'post':112 'premium':102 'premium API access' 'price':62,166,184,190 'prompt':197 'quot':171 'rate':77,169 'readm':191 'remain':212 'request':14,30,66,93,113 'requir':83 'respons':207 'return':151,192 'schema':208 'scheme':148 'sentiment':160 'settl':67,140 'simpli':85 'sinc':126 'specif':95 'substant':200 'summar':163 'text':162 'token':170 'undocu':213 'unit':121 'upfront':80 'usd':125 'usdc':16,32,69,123,127 'usdc-base' 'use':128,144 'util':57 'valid':175 'varieti':44 'via':10,26 'wallet':196 'web3':54 'x402':11,27,37,88,108 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"73003338-48c4-4096-99bf-f38bc8fc52a9","listingId":"26f09bc5-1173-4acb-89b1-6666aa874e4e","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/apikeys/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:33.784Z"}],"sources":[{"listingId":"26f09bc5-1173-4acb-89b1-6666aa874e4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:33.784Z","lastSeenAt":"2026-04-22T10:02:37.461Z"}],"details":{"listingId":"26f09bc5-1173-4acb-89b1-6666aa874e4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/60 \\\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, rate limits, or minimums","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/60"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/60"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Generating or accessing premium API keys via a single paid POST request","Agent-driven API consumption without pre-registration or API key management","Micropayment-gated access to utility and data endpoints"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or response schema guarantees before purchasing","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.966Z"},"updatedAt":"2026-04-22T10:02:37.461Z"}}