{"id":"66c7ce46-b897-4b5e-8a29-5097e758d395","shortId":"m35quV","kind":"x402","title":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/claims/10` 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 per call (USDC uses 6 decimals). Payment is made by including an X-PAYMENT header; no API keys or accounts are required.\n\nThe broader platform advertises four categories of endpoints: 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 listed at the same $0.02/request price point with no rate limits or minimum 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 crawl. The exact functionality of the `/api/v1/claims/10` endpoint specifically is unclear beyond its \"Premium API Access\" label. The endpoint is live and responding with a valid x402 challenge.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API","serverless API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no useful content — only a 'Connect wallet' prompt","No OpenAPI or schema available; request and response formats are unknown","The specific purpose of /api/v1/claims/10 ('Premium API Access') is not documented anywhere","The broad catalog of endpoints (AI, finance, data, utils) is advertised but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live with 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 schema, and no examples. The purpose of '/api/v1/claims/10' specifically is unclear beyond its generic label. Pricing is clear but everything else must be 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'/api/v1/claims/10':64,218 '/docs':179 '/pricing':180 '/readme':183 '/request':19,38,164 '0.02':18,37,91,163 '000':80 '0x8335':85 '20':79 '2913':86 '402':74 '6':96 'Base network API' 'USDC API' 'access':70,227 'account':112 'advertis':118 'ai':12,31,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,24,48,69,109,226 'avail':209 'base':8,27,57,81,88 'base-network' 'beyond':223 'broader':116 'call':4,23,93 'categori':120 'challeng':75,239 'classif':137 'collect':42 'commit':173 'connect':189 'content':195 'convers':154 'crawl':212 'crypto payment API' 'data':11,30,123,127 'data-analytics' 'decim':97 'document':174,204 'embed':138 'embeddings' 'endpoint':16,35,49,63,122,157,219,230 'equal':90 'estim':148 'exact':214 'exampl':208 'exchang':143 'export':128 'extrem':176 'feed':142 'financ':13,32,139 'finance-data' 'four':119 'function':215 'gas':147 'generat':155 'geocod':152 'geocoding' 'header':107 'host':40 'includ':102 'infrastructur':150 'insight':129 'key':110 'label':228 'learn':132 'limit':170 'list':66,159 'live':232 'low fee API' 'lowpaymentfee.com':39 'machin':131 'made':100 'metric':125 'micropayment API' 'minimum':172 'network':58 'no-api-key' 'openapi':199 'page':184 'pay':2,21,45 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':44 'payment':98,106 'per':3,22,46,92 'platform':117 'point':166 'premium':68,225 'price':141,165 'prompt':191 'protocol':54 'quot':146 'rate':144,169 'render':186 'report':126 'request':47,76 'request/response':202 'requir':114 'respond':234 'return':72 'schema':203 'sentiment':133 'sentiment-analysis' 'serverless API' 'settl':50 'spars':177 'spec':200 'specif':62,220 'suit':6,25 'summar':136 'text':135 'text-summarization' 'token':145 'unclear':222 'unit':82 'usag':207 'usdc':60,84,94 'usdc-settlement' 'use':59,95 'util':15,34,151 'utility-apis' 'valid':153,237 'via':9,28,51 'wallet':190 'web3':140 'x':105 'x-payment':104 'x402':10,29,53,238 'x402 API' 'x402-payment'","prices":[{"id":"762f13d3-f00f-40f3-9948-7a3fc08134db","listingId":"66c7ce46-b897-4b5e-8a29-5097e758d395","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:41.660Z"}],"sources":[{"listingId":"66c7ce46-b897-4b5e-8a29-5097e758d395","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:41.660Z","lastSeenAt":"2026-04-23T01:01:25.143Z"}],"details":{"listingId":"66c7ce46-b897-4b5e-8a29-5097e758d395","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/10 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/10"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","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":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time financial data or crypto gas estimates with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Low-volume or bursty workloads where per-call pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.755Z"},"updatedAt":"2026-04-23T01:01:25.143Z"}}