{"id":"b6f1a26d-bd98-4fcb-b729-172112c75abe","shortId":"3kdC9r","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/payments/99` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 exact functionality behind the \"Premium API Access\" label at `/api/v1/payments/99` is unclear — it does not map to any of the named endpoints on the homepage. Prospective users should be aware that without documentation, the input format and response structure for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee","crypto API payments"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found","The endpoint path /api/v1/payments/99 does not correspond to any named endpoint on the homepage; its exact functionality is unknown","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/99","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/payments/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation is effectively absent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/payments/99 ('Premium API Access') is not explained anywhere on the site. The listing is essentially a stub with confirmed 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'/api/v1/payments/99':112,219 '/docs':174 '/pricing':175 '/readme':178 '/request':12,31 '0.02':11,30,98,141 '000':130 '0x8335':135 '20':129 '2913':136 'Base network API' 'USDC API' 'access':118,163,216 'across':58 'advertis':161 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,151,215 'avail':204 'awar':239 'base':8,27,106,131,138 'base-network' 'behind':212 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':168 'connect':184 'content':190 'convers':91 'crawl':207 'crypto API payments' 'data':14,33,61,65 'data-analytics' 'document':169,199,242 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,94,110,231,252 'equal':140 'estim':86 'exact':148,210 'exampl':203 'exchang':81 'export':66 'extrem':171 'feed':80 'financ':16,35,77 'finance-data' 'format':245 'four':59 'function':211 'gas':85 'generat':92 'geocod':89 'geocoding' 'homepag':234 'infrastructure/utilities':88 'input':244 'insight':67 'instant':162 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'x402':10,29,43,123,147 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"92571d07-e43b-4042-8ab9-5d5597002daa","listingId":"b6f1a26d-bd98-4fcb-b729-172112c75abe","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/payments/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:11.272Z"}],"sources":[{"listingId":"b6f1a26d-bd98-4fcb-b729-172112c75abe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:11.272Z","lastSeenAt":"2026-04-23T02:01:21.311Z"}],"details":{"listingId":"b6f1a26d-bd98-4fcb-b729-172112c75abe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/99 \\\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 are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/99"},{"claim":"Payment settles in USDC on the Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-purchasable API calls into autonomous workflows via x402"],"bestFor":["Developers wanting zero-commitment, keyless 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 OpenAPI specs before integrating","High-throughput use cases where per-request crypto settlement overhead is impractical","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:04.818Z"},"updatedAt":"2026-04-23T02:01:21.311Z"}}