{"id":"c2951ec2-e8c6-489c-bf50-c76b07b4ca75","shortId":"KT7VqK","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/206` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per request. No API keys, rate limits, or subscriptions are needed — callers simply attach an x402 payment header to each POST 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 listed endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nDocumentation is extremely sparse — 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 crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what request body the `/api/v1/charges/206` endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","no-auth api","crypto pay api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/charges/206 is unclear; 'Premium API Access' is a generic label","Request and response formats are entirely unknown","The breadth of advertised endpoints (AI, finance, data, geo) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/206","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/206","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 402 challenge, confirming pricing and network. 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/charges/206 ('Premium API Access') is undefined beyond its label. This is effectively a stub 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'/api/v1/charges/206':64,229 '/call':19,38 '/docs':173 '/pricing':174 '/readme':177 '0.02':18,37,89,159 '000':78 '0x8335':83 '20':77 '2913':84 '402':217 '6':87 'access':50,69 'advertis':115 'ai':12,31,127 'ai-inference' 'analysi':131 'analyt':121 'api':5,24,48,68,93 'attach':103 'avail':204 'base':8,27,58,79,86,167 'base network api' 'bodi':227 'broader':113 'caller':101 'categori':117 'challeng':218 'classif':134 'classification' 'collect':42 'confirm':212 'connect':183 'convers':151 'crawl':207 'crypto pay api' 'data':11,30,120,124 'data-analytics' 'decim':88 'detail':190 'document':168,199,221 'embed':135 'embeddings' 'endpoint':16,35,49,62,119,155,210,230 'estim':145 'exampl':203 'exchang':140 'expect':231 'export':125 'extrem':170 'feed':139 'financ':13,32,136 'finance-data' 'four':116 'gas':144 'generat':152 'geocod':149 'geocoding' 'header':107 'infrastructur':147 'insight':126 'key':94 'label':66 'learn':129 'limit':96 'list':154 'live':213 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'materi':208 'metric':122 'micropayment api' 'need':100 'network':59 'no-api-key' 'no-auth api' 'offer':40 'openapi':194 'page':178 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payload':235 'payment':54,73,106 'per':3,22,46,90,160 'platform':114 'post':110 'premium':67 'price':138,157 'prompt':185 'protocol':55 'quot':143 'rate':95,141 'render':180 'report':123 'request':4,23,47,91,111,161,226 'request/response':197 'requir':71 'respons':234 'return':214,237 'schema':198 'sentiment':130 'sentiment-analysis' 'settl':163 'simpli':102 'spars':171 'spec':195 'specif':61 'subscript':98 'suit':6,25 'summar':133 'technic':189 'text':132 'text-summarization' 'token':142 'unclear':224 'unit':80 'usag':202 'usdc':82,165 'usdc api access' 'usdc-base' 'util':15,34,148 'utility-apis' 'valid':150,216 'via':9,28,51 'wallet':184 'web3':137 'without':220 'x402':10,29,53,105 'x402 api' 'x402-payment'","prices":[{"id":"8a36df95-0fe7-4ed4-b9e7-cdad5a1b91a8","listingId":"c2951ec2-e8c6-489c-bf50-c76b07b4ca75","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/206","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:38.709Z"}],"sources":[{"listingId":"c2951ec2-e8c6-489c-bf50-c76b07b4ca75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/206","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:38.709Z","lastSeenAt":"2026-04-23T09:31:00.346Z"}],"details":{"listingId":"c2951ec2-e8c6-489c-bf50-c76b07b4ca75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/206 \\\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 up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/206"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","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":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Running data analytics or export tasks paid per request via USDC on Base","Geocoding or data validation as a utility microservice with no subscription commitment"],"bestFor":["AI agents with Base USDC wallets needing keyless API access","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that prefer on-chain payment settlement"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.778Z"},"updatedAt":"2026-04-23T09:31:00.346Z"}}