{"id":"fc2202d7-a5c9-4a70-8fe0-5c5a2132a02c","shortId":"VEqtPh","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-enabled API platform that exposes a broad catalog 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/claims/14` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 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 with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 examples available. The purpose of the `/claims/14` endpoint specifically is unclear beyond the generic \"Premium API Access\" label. Without documentation it is impossible to determine what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment required","crypto api gateway"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are empty beyond a 'Connect wallet' prompt — no usable docs available.","The specific endpoint /api/v1/claims/14 is not listed on the homepage catalog; its exact functionality is unknown.","No OpenAPI spec or request/response schema is provided; callers cannot determine what payload to send.","No examples or error documentation available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/14","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/claims/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/claims/14 is unclear. The catalog listing on the homepage provides category-level info but no endpoint-specific details for this 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'/api/v1/claims/14':110 '/claims/14':216 '/docs':182 '/pricing':184 '/readme':186 '/request':17,34 '0.02':16,33,94,137 '000':126 '0x8335':131 '20':125 '2913':132 '300':153 '402':120 '402 payment required' '6':141 'access':116,164,226 'across':50 'advertis':163 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,115,157,225 'avail':211 'base':7,24,101,127,134 'base usdc api' 'base-network' 'beyond':221 'bodi':237 'broad':46 'call':92 'catalog':47 'categori':52 'challeng':121 'classif':67 'classification' 'connect':192 'content':198 'convers':84 'crypto api gateway' 'data':9,26,53,57 'data-analytics' 'decim':142 'determin':234 'document':177,207,229 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,109,217 'equal':136 'estim':78 'exact':149 'exampl':210 'exchang':73 'expect':244 'export':58 'expos':44 'extrem':179 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'gas':77 'gate':3,20 'generat':85 'generic':223 'geocod':82 'geocoding' 'given':138 'header':176 'imposs':232 'includ':170 'infrastructur':80 'insight':59 'instant':166 'key':158 'label':227 'learn':62 'limit':161 'list':112 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':145 'metric':55 'micropayment api' 'network':102 'no-api-key' 'offer':8,25 'openapi':202 'page':187 'pay':90 'pay per call api' 'pay-per-cal':89 'pay-per-request' 'payment':143,168,175 'per':91 'platform':5,22,42 'premium':114,224 'price':71 'prompt':194 'protocol':106 'purpos':213 'quot':76 'rate':74,160 'render':189 'report':56 'request':122,236 'request/response':205 'respons':242 'return':118 'schema':206 'scheme':150 'second':154 'send':239 'sentiment':63 'sentiment-analysis' 'settl':96 'spars':180 'spec':203 'specif':108,218 'summar':66 'text':65 'text-summarization' 'timeout':155 'token':75 'unclear':220 'unit':128 'usdc':98,130,139 'usdc-settlement' 'util':13,30,81 'valid':83 'via':103,146 'wallet':193 'web3':70 'without':228 'x':174 'x-payment':173 'x402':2,19,39,105,148 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fb84293d-3690-4df7-96ae-95a056a9a20b","listingId":"fc2202d7-a5c9-4a70-8fe0-5c5a2132a02c","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/claims/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:42.252Z"}],"sources":[{"listingId":"fc2202d7-a5c9-4a70-8fe0-5c5a2132a02c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:42.252Z","lastSeenAt":"2026-04-23T06:31:03.230Z"}],"details":{"listingId":"fc2202d7-a5c9-4a70-8fe0-5c5a2132a02c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/14 \\\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":"The homepage lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/claims/14 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/claims/14"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time finance data such as token quotes, gas estimates, and exchange rates on a per-call basis","Using utility services like geocoding, validation, and data conversion with instant crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access via crypto","Agents or bots that can settle x402 payments autonomously on Base","Quick prototyping where avoiding API key management is valuable"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users without USDC on the Base network or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.754Z"},"updatedAt":"2026-04-23T06:31:03.230Z"}}