{"id":"bfdc881a-6446-4a1a-b6be-3a1a0adb02d4","shortId":"dN9DSb","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/claims/75` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\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 per request price point.\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/75` endpoint is unclear beyond its title \"Premium API Access\" — it does not map obviously to any of the named endpoints on the landing page. Callers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","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","lowpaymentfee","low payment fee","crypto API gateway"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or JSON schema provided for request or response formats","The endpoint path /api/v1/claims/75 does not match any of the named endpoints listed on the landing page; its exact functionality is unknown","No examples or sample responses available from any crawled page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/75","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/75","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 challenge, confirming it accepts USDC on Base at $0.02/request. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/claims/75 is unclear and doesn't correspond to any named endpoint on the landing 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'/api/v1/claims/75':57,198 '/docs':159 '/pricing':160 '/readme':163 '/request':16,32 '0.02':15,31,80,149 '000':74 '20':73 'Base network API' 'USDC API' 'access':63,207 'advertis':90,104 'ai':9,25,116 'ai-inference' 'analysi':120 'analyt':8,24,110 'api':4,20,45,62,84,206 'attach':93 'avail':189 'base':7,23,52,75 'base-network' 'beyond':202 'broader':102 'call':44 'caller':91,223 'categori':106 'challeng':69 'classif':123 'classification' 'collect':36 'connect':169 'contact':229 'content':175 'convers':140 'crawl':192 'crypto API gateway' 'data':109,113 'data-analytics' 'detail':233 'document':154,184 'embed':124 'embeddings' 'endpoint':13,29,46,56,108,143,199,218 'estim':134 'exact':194 'exampl':188 'exchang':129 'expect':225 'experi':227 'export':114 'extrem':156 'feed':128 'financ':10,26,125 'finance-data' 'four':105 'function':195 'gas':133 'gate':3,19 'generat':141 'geocod':138 'geocoding' 'header':97 'i.e':79 'infrastructur':136 'insight':115 'key':85 'land':221 'learn':118 'limit':88 'list':59,145 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':117 'map':211 'metric':111 'micropayment API' 'name':217 'network':53 'obvious':212 'openapi':179 'page':164,222 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':96 'per':43,81,150 'platform':103 'point':153 'premium':61,205 'price':127,152 'prompt':171 'protocol':40 'provid':231 'quot':132 'rate':87,130 'render':166 'report':112 'request':70,82,100,151 'request/response':182 'return':65 'schema':183 'sentiment':119 'sentiment-analysis' 'settl':47 'simpli':92 'spars':157 'spec':180 'specif':55 'standard':67 'suit':5,21 'summar':122 'text':121 'text-summarization' 'titl':204 'token':131 'unclear':201 'unit':76 'usag':187 'usdc':49,78 'usdc-settlement' 'util':12,28,137 'utility-apis' 'valid':139 'wallet':170 'web3':126 'x402':2,18,39,68,95 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"a455f65d-bf0c-46f2-9dc8-a990ca1e2b4e","listingId":"bfdc881a-6446-4a1a-b6be-3a1a0adb02d4","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:01.543Z"}],"sources":[{"listingId":"bfdc881a-6446-4a1a-b6be-3a1a0adb02d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:01.543Z","lastSeenAt":"2026-04-22T23:01:31.381Z"}],"details":{"listingId":"bfdc881a-6446-4a1a-b6be-3a1a0adb02d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/75 \\\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 an x402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/75"},{"claim":"All listed 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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-driven workflows that settle payments automatically via x402 on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","Crypto-native applications that can settle USDC on Base","Low-volume or bursty workloads where per-request pricing avoids subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Teams without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.842Z"},"updatedAt":"2026-04-22T23:01:31.381Z"}}