{"id":"e9e97256-b749-407a-a3d3-d599c1e361fe","shortId":"K4B3my","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/customers/68` is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-call with no API keys, no rate limits, and no commitments required — the x402 payment header is the only authentication mechanism.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The purpose and expected input/output of the `/api/v1/customers/68` endpoint specifically is unclear — it does not appear in the site's listed API catalog, making it difficult to determine what data it returns or what POST body it expects.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["The /api/v1/customers/68 endpoint does not appear in the site's published API catalog — its purpose and expected input/output are unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema or request/response examples are available for any endpoint.","The endpoint path '/api/v1/customers/68' suggests it may return customer-specific data — potential PII/privacy concerns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/68","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/customers/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific /api/v1/customers/68 endpoint is not listed in the site's catalog, making its purpose unclear. This is effectively a stub 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fee' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':66 'made':151 'make':235 'maxamountrequir':130 'mechan':174 'metric':60 'micropayment API' 'network':105 'offer':50 'openapi':200 'page':185 'paid':99 'pay':2,22 'pay-per-cal':1,21 'pay-per-call API' 'pay-per-request' 'payment':149,168 'per':3,23,97,153 'per-cal':152 'platform':6,26,48 'post':123,246 'premium':118 'price':76,94,182 'prompt':192 'protocol':109 'purpos':213 'quot':81 'rate':79,160 'readm':184 'render':187 'report':61 'request':98,124 'request/response':203 'requir':165 'return':243 'schema':201 'sentiment':68 'sentiment-analysis' 'site':230 'spars':178 'specif':111,221 'summar':71 'text':70 'text-summarization' 'token':80 'unclear':223 'unit':134 'usdc':9,29,101,136,145 'usdc-base' 'util':16,36,86 'utility-apis' 'valid':88 'varieti':52 'via':10,30,106 'wallet':191 'web3':75 'x402':11,31,45,108,126,167 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"8caf36c9-d5e8-416d-b323-1920edd8a491","listingId":"e9e97256-b749-407a-a3d3-d599c1e361fe","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/customers/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:30.609Z"}],"sources":[{"listingId":"e9e97256-b749-407a-a3d3-d599c1e361fe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:30.609Z","lastSeenAt":"2026-04-22T21:30:32.544Z"}],"details":{"listingId":"e9e97256-b749-407a-a3d3-d599c1e361fe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/68 \\\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 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/customers/68 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/68"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages 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","Fetching real-time finance data like token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting data on a per-request payment basis","Using utility services like geocoding and validation with instant crypto-settled access"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access via crypto","Agents and bots that can settle x402 payments autonomously on Base","Projects needing low-cost per-call access to diverse API categories"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with traditional billing","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.696Z"},"updatedAt":"2026-04-22T21:30:32.544Z"}}