{"id":"b42f3fe0-2dc2-4e42-b2b2-7005d89d2f40","shortId":"WJccuv","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 hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/claims/32` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nDocumentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/claims/32` (\"Premium API Access\") is unclear — the name is generic and no input/output schema is documented beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","cheap api access","crypto-paid api"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/claims/32 ('Premium API Access') is undefined — unclear what data or service it returns","No request body schema or response schema documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/32","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/32","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 confirms pricing and settlement details, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and the purpose of '/api/v1/claims/32' is unclear beyond the generic label 'Premium API Access'. This is essentially a stub 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'/request':17,34 '0.02':16,33,123,156 '000':117 '1':167 '20':116 'access':110,220 'actual':214 'advertis':129 'ai':10,27 'ai-inference' 'ai/ml':52 'also':128 'analysi':134 'analyt':51 'api':4,21,41,81,109,182,219 'attach':92 'avail':212 'base':7,24,76,118 'base usdc api' 'base-network' 'behind':216 'beyond':233 'call':125 'caller':90 'captur':164 'challeng':161,236 'cheap api access' 'classif':137 'collect':46 'commit':89 'confirm':171 'connect':191 'convers':149 'crypto-paid api' 'data':9,26,50,55 'data-analytics' 'detail':198 'doc':181 'document':176,207,232 'embed':138 'enabl':40 'endpoint':14,31,48,61,102,131,173 'estim':146 'exampl':210 'exchang':141 'extrem':178 'feed':140 'financ':11,28 'finance-data' 'finance/web3':54 'function':215 'gas':145 'gate':3,20 'general':57 'generat':151 'generic':226 'geocod':147 'header':96 'host':44 'i.e':122 'infer':53 'input/output':229 'key':82 'limit':85 'list':106 'live':175 'low payment fee' 'lowpaymentfee.com':35 'maximum':114 'metadata':237 'micropayment api' 'minimum':88 'name':224 'network':77 'no-api-key' 'offer':8,25 'openapi':202 'page':186 'pay':64 'pay-per-call api' 'pay-per-request':63 'payload':211 'payment':95 'per':65,124 'platform':5,22,42,127 'point':158 'premium':108,218 'price':139,157,183 'prompt':193 'protocol':70,170 'quot':144 'rate':84,142 'readm':185 'render':188 'request':66,99 'request/response':205 'requir':112 'schema':206,230 'sentiment':133 'servic':59 'settl':71 'sibl':130 'simpli':91 'span':49 'spars':179 'spec':203 'specif':101 'success':163 'summar':136 'technic':197 'text':135 'token':143 'unclear':222 'unit':119 'usdc':73,121 'usdc-settlement' 'use':67 'util':13,30,58 'utility-services' 'valid':148 'version':166 'wallet':192 'web3-data' 'x402':2,19,39,69,94,160,235 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d6da7ad8-be8f-4bfb-895a-2b191140c376","listingId":"b42f3fe0-2dc2-4e42-b2b2-7005d89d2f40","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:48.271Z"}],"sources":[{"listingId":"b42f3fe0-2dc2-4e42-b2b2-7005d89d2f40","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:48.271Z","lastSeenAt":"2026-04-23T06:31:03.489Z"}],"details":{"listingId":"b42f3fe0-2dc2-4e42-b2b2-7005d89d2f40","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/32 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/32"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/32"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto market data with per-request micropayments","Using utility services like geocoding, validation, and data conversion via x402"],"bestFor":["Agents or developers wanting zero-signup, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who want no subscriptions"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.419Z"},"updatedAt":"2026-04-23T06:31:03.489Z"}}