{"id":"87904c5d-9ce1-45e9-bfbe-23df49f0b771","shortId":"kz5GDR","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-protocol API platform that gates a broad set of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/claims/8` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe wider platform advertises four endpoint 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 listed at the same $0.02 per request price point.\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 exact functionality behind the `/api/v1/claims/8` path is unclear — the name \"Premium API Access\" is generic and does not describe a specific capability. Prospective users should be aware that without documentation, integration requires experimentation or contacting the provider directly.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The exact functionality of /api/v1/claims/8 ('Premium API Access') is undefined — the name is generic","Cannot verify what data or service is actually returned upon successful payment","The platform lists many endpoint categories but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/8","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schemas, no examples, and the /docs page is empty. The specific purpose of /api/v1/claims/8 is unknown beyond the generic label 'Premium API 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'/api/v1/claims/8':65,200 '/docs':163 '/pricing':165 '/readme':167 '/request':17,34 '0.02':16,33,76,153 '000':80 '20':79 '6':86 'access':71,208 'advertis':109 'ai':10,27,120 'ai-inference' 'analysi':124 'analyt':114 'api':4,21,41,70,89,207 'attach':98 'avail':194 'awar':222 'base':7,24,60,81 'base usdc api' 'behind':50,198 'broad':46 'call':78 'caller':96 'capabl':217 'categori':112 'classif':127 'classification' 'connect':173 'contact':230 'convers':144 'cost':73 'crypto-quotes' 'data':9,26,113,117 'data-analytics' 'decim':87 'describ':214 'detail':180 'direct':233 'document':158,189,225 'embed':128 'embeddings' 'endpoint':14,31,49,64,111,147 'estim':138 'exact':196 'exampl':192 'exchang':133 'experiment':228 'export':118 'extrem':160 'feed':132 'financ':11,28,129 'finance-data' 'four':110 'function':197 'gas':137 'gate':3,20,44 'generat':145 'generic':210 'geocod':142 'geocoding' 'header':102 'infrastructur':140 'insight':119 'integr':226 'key':90 'learn':122 'limit':93 'list':67,149 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'metric':115 'micropay':54 'micropayment api' 'name':205 'network':61 'offer':8,25 'openapi':184 'page':168 'path':201 'pay-per-request api' 'payload':193 'payment':101 'per':52,77,154 'per-request':51 'per-request-micropayment' 'platform':5,22,42,108 'point':157 'premium':69,206 'price':131,156 'prompt':175 'prospect':218 'protocol':40 'provid':232 'quot':136 'rate':92,134 'render':170 'report':116 'request':53,105,155 'request/response':187 'requir':95,227 'schema':188 'sentiment':123 'sentiment-analysis' 'set':47 'settl':55 'simpli':97 'spars':161 'spec':185 'specif':63,216 'summar':126 'technic':179 'text':125 'text-summarization' 'token':135 'unclear':203 'unit':82 'usdc':57,84 'usdc-base' 'user':219 'util':13,30,141 'utility-apis' 'valid':143 'wallet':174 'web3':130 'wider':107 'without':224 'x402':2,19,39,100 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2056da88-d336-4fe6-8cb2-31554acc6a2e","listingId":"87904c5d-9ce1-45e9-bfbe-23df49f0b771","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:57.959Z"}],"sources":[{"listingId":"87904c5d-9ce1-45e9-bfbe-23df49f0b771","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:57.959Z","lastSeenAt":"2026-04-23T06:31:03.927Z"}],"details":{"listingId":"87904c5d-9ce1-45e9-bfbe-23df49f0b771","quickStartSnippet":"# POST with x402 payment header (pseudo-example)\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/8 \\\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/8"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/8"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment","Running geocoding or data validation utilities on a pay-per-call basis","Exporting analytics data or generating insights reports"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or experimental use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing SLAs and documented schemas","Users who need detailed API documentation or guaranteed response formats before integrating","Non-crypto users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.048Z"},"updatedAt":"2026-04-23T06:31:03.927Z"}}