{"id":"e4bffad6-aa93-4dc3-b9b1-032965eb2597","shortId":"8q6dzF","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/apikeys/75` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. The broader platform also exposes 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/request price point.\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 example payloads available. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what it returns beyond `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","low fee API","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/apikeys/75 ('Premium API Access') is unclear — it may generate API keys or grant access but this is unconfirmed","No example requests or responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/75","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/apikeys/75","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint ('Premium API Access' at /apikeys/75) is ambiguous. Effectively a stub 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'/api/v1/apikeys/75':88 '/docs':170 '/pricing':171 '/readme':174 '/request':162 '0.02':9,22,62,113,161 '000':103 '0x8335':108 '20':102 '300':128 '402':209 '6':117 'Base network API' 'USDC API access' 'access':3,16,43,94 'advertis':98 'ai-inference' 'ai/ml':52 'also':134 'analysi':139 'analyt':51 'api':2,15,34,75,93 'api-key-generation' 'application/json':229 'avail':201 'base':8,21,67,104,110 'beyond':228 'bodi':219 'broader':132 'call':60 'chain':72 'challeng':97,210 'classif':142 'classification' 'commit':83 'connect':180 'convers':154 'cost':61 'crypto-data' 'crypto-gated API' 'data':50,55 'data-analytics' 'decim':118 'detail':187 'document':165,196,213 'embed':143 'embeddings' 'endpoint':48,86,136,203,222 'equal':112 'estim':151 'exact':124 'exampl':199 'exchang':146 'expect':223 'expos':135 'extrem':167 'feed':145 'finance-data' 'finance/web3':54 'gas':150 'gate':42 'generat':156 'geocod':152 'geocoding' 'given':114 'infer':53 'infrastructur':57 'key':76 'limit':79 'list':90 'live':205 'low fee API' 'lowpaymentfee.com':27 'made':121 'maxamountrequir':100 'micropay':6,19 'micropayment API' 'network':68 'on-chain':70 'openapi':191 'page':175 'pay':31 'pay-per-call API' 'pay-per-request':30 'payload':200 'payment':119 'per':10,23,32 'platform':35,133 'point':164 'premium':1,14,92 'price':144,163 'prompt':182 'proper':208 'protocol':40 'quot':149 'rate':78,147 'render':177 'request':11,24,33,218 'request/response':194 'return':206,227 'schema':195 'scheme':125 'second':129 'sentiment':138 'sentiment-analysis' 'settl':69 'span':49 'spars':168 'spec':192 'specif':85,221 'summar':141 'technic':186 'text':140 'text-summarization' 'timeout':130 'token':148 'unclear':216 'unit':105 'upfront':82 'usdc':13,26,64,107,115 'usdc-base' 'use':37 'util':58 'utility-services' 'valid':153 'varieti':46 'via':4,17,122 'wallet':181 'without':212 'x402':5,18,39,96 'x402 API' 'x402-payment'","prices":[{"id":"4f06f2d8-d2ca-4a3b-83d9-3e11274abf29","listingId":"e4bffad6-aa93-4dc3-b9b1-032965eb2597","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/apikeys/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:40.348Z"}],"sources":[{"listingId":"e4bffad6-aa93-4dc3-b9b1-032965eb2597","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:40.348Z","lastSeenAt":"2026-04-22T09:01:54.559Z"}],"details":{"listingId":"e4bffad6-aa93-4dc3-b9b1-032965eb2597","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/75 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network with exact scheme and 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/apikeys/75"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents purchasing on-demand API access without pre-registration or API keys","Pay-per-request AI inference (sentiment, summarization, classification, embeddings)","Fetching real-time crypto quotes, gas estimates, and exchange rates","On-demand geocoding and data validation utilities","Generating API keys or premium access tokens via micropayment"],"bestFor":["AI agents that need keyless, on-demand API access via x402","Developers who want to avoid subscription commitments and pay per call","Web3-native applications already operating on the Base network"],"notFor":["Users without a Base-compatible wallet or USDC holdings","High-volume batch processing where per-request pricing becomes expensive","Developers who need detailed API documentation and typed schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.626Z"},"updatedAt":"2026-04-22T09:01:54.559Z"}}