{"id":"0c5ffe29-95e4-4969-a0ab-176ca1544877","shortId":"7SJqS4","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/messages/78` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 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 price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact functionality behind the `/api/v1/messages/78` path is unclear from available materials.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","premium-api-access"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The specific function of /api/v1/messages/78 ('Premium API Access') is not described anywhere in crawled materials","No request body schema or response format documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/78","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/messages/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The purpose of /api/v1/messages/78 specifically is unknown. Effectively a stub 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'/api/v1/messages/78':88,209 '/pricing':189 '/readme':191 '/request':13,28 '0.02':12,27,64,119,171 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':113 '20':107 '2913':114 '300':139 '6':123 'Base network API' 'USDC API' 'accept':96 'access':7,22,94 'across':50 'address':135 'advertis':102,145 'ai/ml':53 'analysi':149 'analyt':52 'api':6,21,37,76,93 'avail':214 'base':9,24,72,109,116 'behind':207 'broad':42 'broader':143 'call':4,19 'catalog':43 'challeng':101 'classif':152 'commit':82 'connect':197 'content':203 'convers':164 'cost':105 'crawl':186 'data':51 'decim':124 'detail':181 'document':182 'embed':153 'enabl':36 'endpoint':49,60,86,146 'equal':118 'estim':161 'exact':131,205 'exampl':179 'exchang':156 'feed':155 'finance/web3':55 'found':184 'function':206 'gas':160 'generat':166 'geocod':162 'given':120 'howev':174 'infer':54 'infrastructur':57 'key':77 'limit':79 'list':90 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'made':127 'materi':215 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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/messages/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.053Z"}],"sources":[{"listingId":"0c5ffe29-95e4-4969-a0ab-176ca1544877","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.053Z","lastSeenAt":"2026-04-22T02:32:08.108Z"}],"details":{"listingId":"0c5ffe29-95e4-4969-a0ab-176ca1544877","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/messages/78"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/78"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to premium content or services with per-call USDC micropayments","Testing x402 payment flows on Base network"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.073Z"},"updatedAt":"2026-04-22T02:32:08.108Z"}}