{"id":"25fbe1c0-5aed-4fe4-8be6-c596d7d30a4a","shortId":"MjENmQ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/15` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call, consistent with the site's uniform $0.02/request pricing. The platform advertises categories including: metrics and reports APIs, data export and insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities.\n\nDocumentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all appear to require a wallet connection and render no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed descriptions of what each endpoint actually returns. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles in USDC on Base, but the actual functionality behind this particular \"Premium API Access\" path is not documented in the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available; all doc pages require wallet connection and show no content.","The specific endpoint /api/v1/payments/15 is labeled 'Premium API Access' but its actual functionality is undocumented — it does not appear in the site's listed API catalog.","No request or response examples are available anywhere in the crawled material.","The platform lists many endpoint categories but none have detailed documentation visible without a connected wallet."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/15","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/15","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 pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual functionality of the /api/v1/payments/15 endpoint is undocumented — it is unclear what it returns or what input it 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'list':98 'live':208 'low fee API' 'lowpaymentfee.com':39 'materi':242 'metric':131 'micropayment API' 'network':77 'no-api-key' 'offer':10,29 'openapi':189 'page':163,173 'paid':68 'particular':231 'path':235 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,115 'per-request':69 'per-request-billing' 'platform':6,25,46,127 'post':217 'premium':100,232 'price':125,145,170 'protocol':81 'provid':48 'quot':150 'rate':86,148 'readm':172 'render':182 'report':133 'request':71,218 'request/response':192 'requir':91,177 'return':203 'schema':190 'sentiment':139 'sentiment-analysis' 'servic':64 'settl':220 'site':120 'span':54 'specif':93 'subscript':90 'substant':184 'summar':142 'text':141 'text-summarization' 'thin':166 'token':149 'uniform':122 'unit':110 'usdc':9,28,73,112,222 'usdc-base' 'use':72 'util':15,34,63,158 'utility-services' 'valid':154 'via':78 'wallet':179 'well':211 'well-form':210 'x402':43,80,205 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"55e2f902-5274-4ea8-8a51-40c16b5ac8c0","listingId":"25fbe1c0-5aed-4fe4-8be6-c596d7d30a4a","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:32.921Z"}],"sources":[{"listingId":"25fbe1c0-5aed-4fe4-8be6-c596d7d30a4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:32.921Z","lastSeenAt":"2026-04-23T05:01:21.950Z"}],"details":{"listingId":"25fbe1c0-5aed-4fe4-8be6-c596d7d30a4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/15 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/15"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/15"},{"claim":"Uniform pricing of $0.02 per request across all listed endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Listed API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting data or generating analytics reports via micropayment-gated endpoints"],"bestFor":["Developers who want instant API access without signup or subscription","Agents and bots that can settle USDC payments on Base automatically via x402","Projects needing low-cost, low-friction access to a variety of utility and AI endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.572Z"},"updatedAt":"2026-04-23T05:01:21.950Z"}}