{"id":"f55ef59b-86c1-4666-9f67-381a81b2efdd","shortId":"zLLpTs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The probed endpoint (/api/v1/payments/81) is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe site 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 listed endpoints are priced at $0.02 per request.\n\nDocumentation is extremely thin — the /docs, /pricing, /api, 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 usage examples available from the crawl. The specific endpoint probed (/api/v1/payments/81) does not appear in the site's public catalog, so its exact functionality is unclear beyond the generic \"Premium API Access\" label. The endpoint is live and responds with a well-formed x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","data-export"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only a wallet connect prompt","No OpenAPI or schema definitions found for any endpoint","The probed endpoint /api/v1/payments/81 is not listed in the site's public catalog; its specific functionality is unknown","No request or response examples are available to verify what data the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/81","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/payments/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, no examples. The probed endpoint path (/api/v1/payments/81) doesn't match any publicly listed endpoint, making its purpose 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'/api/v1/payments/81':62,206 '/docs':167 '/pricing':168 '/readme':171 '0.02':85,159 '000':79 '20':78 '402':73 '6':91 'access':68,227 'advertis':100,117 'ai':12,28,128 'ai-inference' 'analysi':132 'analyt':11,27,122 'analytics-api' 'api':5,21,39,67,94,226 'appear':209 'attach':103 'avail':198 'base':8,24,57,80 'base network api' 'beyond':222 'broad':44 'call':4,20,87 'caller':101 'catalog':45,215 'categori':120 'challeng':74,241 'classif':135 'classification' 'connect':177 'convers':151 'cover':10,26 'crawl':201 'crypto api access' 'data':121,125 'data-export' 'decim':92 'detail':184 'document':162,193 'embed':136 'embeddings' 'enabl':38 'endpoint':16,32,51,61,119,155,204,230 'estim':146 'exact':218 'exampl':197 'exchang':141 'export':126 'extrem':164 'feed':140 'financ':13,29,137 'finance-data' 'form':239 'four':118 'function':219 'gas':145 'generat':152 'generic':224 'geocod':149 'geocoding' 'header':108 'i.e':84 'infrastructure/utilities':148 'insight':127 'key':95 'label':228 'learn':130 'limit':98 'list':64,154 'live':232 'low payment fee' 'lowpaymentfee.com':33 'machin':129 'metric':123 'micropayment api' 'network':58 'offer':42 'openapi':188 'page':172 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payment':107,113 'per':3,19,49,86,160 'platform':6,22,40 'premium':66,225 'price':139,157 'probe':60,205 'prompt':179 'proof':114 'public':214 'quot':144 'rate':97,142 'render':174 'report':124 'request':50,75,161 'request/response':191 'respond':234 'return':70 'schema':192 'sentiment':131 'sentiment-analysis' 'settl':52 'simpli':102 'sinc':88 'site':116,212 'spec':189 'specif':203 'summar':134 'technic':183 'text':133 'text-summarization' 'thin':165 'token':143 'unclear':221 'unit':81 'usag':196 'usdc':9,25,54,83,89 'usdc api' 'usdc-base' 'use':90 'util':15,31 'valid':72,111,150 'wallet':178 'web3':138 'well':238 'well-form':237 'x':106 'x-payment':105 'x402':37,112,240 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"21c9c963-4b70-46dd-8bbc-0604b74f2a45","listingId":"f55ef59b-86c1-4666-9f67-381a81b2efdd","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/payments/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:50.763Z"}],"sources":[{"listingId":"f55ef59b-86c1-4666-9f67-381a81b2efdd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:50.763Z","lastSeenAt":"2026-04-23T02:01:20.109Z"}],"details":{"listingId":"f55ef59b-86c1-4666-9f67-381a81b2efdd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 x402 challenge for /api/v1/payments/81 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/81"},{"claim":"Endpoint categories include 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 management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running analytics queries and data exports with instant crypto-settled micropayments","Geocoding and data validation via utility endpoints paid per request"],"bestFor":["Agents or apps that need keyless, pay-per-use API access settled on Base","Developers wanting low-friction access to multiple API categories without subscriptions","Crypto-native workflows that can attach x402 payment headers"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.928Z"},"updatedAt":"2026-04-23T02:01:20.109Z"}}