{"id":"7b81c199-a932-4413-992a-c7474e0cb242","shortId":"RP26gt","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that provides a collection 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 `/api/v1/cards/32` is listed as \"Premium API Access\" and returns a live x402 challenge requiring payment of up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The endpoint path `/api/v1/cards/32` does not clearly map to any of the advertised API categories, making its actual functionality unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per request api","micropayment api","base usdc api","402 payment api","crypto api gateway"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema specification found","The endpoint path /api/v1/cards/32 does not correspond to any of the advertised API categories listed on the homepage","No request or response examples available; actual functionality of this specific endpoint is unknown","Platform appears to be a generic demo or early-stage project with many advertised endpoints but no substantive documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/32","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/cards/32","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 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint path '/api/v1/cards/32' doesn't map to any advertised category, making its actual function 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'map':219 'metric':57 'micropayment api' 'network':102 'no-api-key' 'offer':8,25 'openapi':197 'page':181 'path':214 'pay':48 'pay per request api' 'pay-per-request':47 'payment':120,137,164,169 'per':49,94 'platform':5,22,41 'premium':110 'price':73,91,178 'prompt':188 'proof':170 'protocol':39 'provid':43 'quot':78 'rate':76,150 'readm':180 'render':183 'report':58 'request':50,95 'request/response':200 'requir':119,157 'return':114,211 'schema':201 'scheme':144 'sentiment':65 'sentiment-analysis' 'settl':96 'sign':155 'sign-up':154 'simpli':159 'spars':174 'spec':198 'specif':104 'summar':68 'technic':192 'text':67 'text-summarization' 'token':77 'unclear':231 'unit':127 'usdc':98,129 'usdc-settlement' 'util':13,30,83 'valid':85,168 'via':140 'wallet':187 'web3':72 'x':163 'x-payment':162 'x402':2,19,38,117,142 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"942a2de6-5467-4940-92cd-ec284b8863cc","listingId":"7b81c199-a932-4413-992a-c7474e0cb242","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/cards/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:25.592Z"}],"sources":[{"listingId":"7b81c199-a932-4413-992a-c7474e0cb242","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:25.592Z","lastSeenAt":"2026-04-23T11:03:17.858Z"}],"details":{"listingId":"7b81c199-a932-4413-992a-c7474e0cb242","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/cards/32 requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/32"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Querying real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments","Building agent workflows that autonomously purchase API calls using x402 protocol on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that need to autonomously pay for API calls via x402","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.344Z"},"updatedAt":"2026-04-23T11:03:17.858Z"}}