{"id":"5514c6f9-d630-4622-9b62-b4a63d72c245","shortId":"vT5sEq","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 offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/charges/27` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). The site advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access.\n\nThe broader platform groups its endpoints into four 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 use the same x402 payment flow on Base with USDC.\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 usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what request bodies are expected or what response payloads look like for any of the listed APIs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/27 is labeled generically as 'Premium API Access' with no description of what it actually returns","No examples or error handling documentation available","The platform lists many endpoint categories but it is unclear if all are functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/27","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/charges/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/charges/27 ('Premium API Access') is vague and undifferentiated from the other 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'/api/v1/charges/27':61 '/docs':168 '/pricing':170 '/readme':172 '/request':16,32 '0.02':15,31,82,93 '000':76 '20':75 '402':70,209 '6':86 'Base network API' 'USDC API' 'access':66,108 'across':96 'advertis':90 'ai':9,25,125 'ai-inference' 'analysi':129 'analyt':8,24,119 'api':4,20,42,65,101,234 'avail':199 'base':7,23,55,77,160 'base-network' 'bodi':220 'broader':110 'call':41 'captur':211 'categori':117 'challeng':71,210 'classif':132 'classification' 'collect':36 'confirm':207 'connect':178 'convers':149 'crawl':202 'data':118,122 'data-analytics' 'decim':87 'detail':185 'document':163,194,214 'embed':133 'embeddings' 'endpoint':13,29,43,59,98,114,152,205 'estim':143 'exampl':198 'exchang':138 'expect':222 'export':123 'extrem':165 'feed':137 'financ':10,26,134 'finance-data' 'flat':92 'flow':158 'four':116 'gas':142 'gate':3,19,44 'generat':150 'geocod':147 'geocoding' 'given':83 'group':112 'i.e':81 'infrastructur':145 'insight':124 'instant':107 'key':102 'label':63 'learn':127 'like':228 'limit':105 'list':233 'live':208 'look':227 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':126 'materi':203 'metric':120 'micropayment API' 'network':56 'offer':34 'openapi':189 'page':173 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payload':226 'payment':50,157 'per':40,94 'platform':111 'premium':64 'price':136 'prompt':180 'protocol':48 'quot':141 'rate':104,139 'render':175 'report':121 'request':72,95,219 'request/response':192 'respons':225 'return':68 'schema':193 'sentiment':128 'sentiment-analysis' 'settl':49 'site':89 'spars':166 'spec':190 'specif':58 'suit':5,21 'summar':131 'technic':184 'text':130 'text-summarization' 'token':140 'unclear':217 'unit':78 'usag':197 'usdc':52,80,84,162 'usdc-settlement' 'use':153 'util':12,28,146 'valid':148 'validation' 'wallet':179 'web3':135 'without':213 'x402':2,18,47,156 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"6123354f-2670-4c48-9b95-46f2be20f7f6","listingId":"5514c6f9-d630-4622-9b62-b4a63d72c245","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/charges/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:49.037Z"}],"sources":[{"listingId":"5514c6f9-d630-4622-9b62-b4a63d72c245","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:49.037Z","lastSeenAt":"2026-04-23T10:00:48.546Z"}],"details":{"listingId":"5514c6f9-d630-4622-9b62-b4a63d72c245","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/27 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/27"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) via micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","x402-compatible wallets looking for low-cost endpoints on Base","Prototyping workflows that need diverse API capabilities without subscription commitments"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot settle payments in USDC on the Base network","Developers requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.309Z"},"updatedAt":"2026-04-23T10:00:48.546Z"}}