{"id":"b23e806f-8433-4c9c-8839-105a61d250f4","shortId":"FnWQGA","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/charges/125` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02/request price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages (docs, pricing, and API pages all render only a \"Connect wallet\" prompt). The actual functionality behind this specific `/charges/125` endpoint is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","Base network API","micropayment API","serverless API","crypto pay API"],"warnings":["No OpenAPI or schema documentation available — docs/pricing/API pages all render only 'Connect wallet'","The specific endpoint /api/v1/charges/125 has a generic 'Premium API Access' description with no detail on what it actually returns","No example request or response payloads are available from any source","The platform lists many endpoints on its homepage but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/125","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/125","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, and the landing page describes the platform's offerings and pricing. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example requests or responses, and the specific functionality of /api/v1/charges/125 ('Premium API Access') is entirely opaque. This is effectively a stub 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'/charges/125':213 '/request':13,28,176 '0.02':12,27,117,175 '000':100 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':105 '20':99 '2913':106 '300':142 '402':94 '6':112 'Base network API' 'USDC API' 'access':90,222 'across':45 'actual':208 'address':138 'advertis':125,148 'ai-inference' 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,70,89,198,221 'avail':190 'base':8,23,66,101,108 'behind':210 'beyond':217 'broader':146 'call':4,19 'challeng':95 'classif':155 'classification' 'commit':78 'connect':204 'consist':120 'convers':167 'crawl':193 'crypto pay API' 'data':46,51,169 'data-analytics' 'decim':113 'detail':183 'doc':195 'document':184 'embed':156 'embeddings' 'enabl':36 'endpoint':44,56,82,149,214 'estim':164 'exact':134 'exampl':186 'exchang':159 'feed':158 'finance-data' 'finance/web3':50 'flat':126 'function':209 'gas':163 'generat':170 'generic':219 'geocod':165 'geocoding' 'howev':179 'infer':49 'key':71 'label':223 'limit':74 'list':86 'low payment fee' 'lowpaymentfee.com':31 'made':130 'micropayment API' 'minimum':77 'network':9,24,67 'no-api-key' 'offer':40 'openapi':181 'page':194,199 'paid':58 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'payload':188 'payment':128 'per':3,18,60,118 'per-request':59 'per-request-pricing' 'platform':6,21,38,147 'point':178 'premium':88,220 'price':127,157,177,196 'prompt':206 'quot':162 'rate':73,160 'render':201 'request':61,96,119 'request/response':187 'requir':79 'return':92 'schema':182 'scheme':135 'second':143 'sentiment':151 'sentiment-analysis' 'serverless API' 'servic':54 'settl':136 'sinc':109 'site':123 'specif':81,212 'summar':154 'text':153 'text-summarization' 'timeout':144 'token':161 'translat':115 'unclear':216 'unit':102 'usdc':15,30,63,104,110 'usdc-base-network' 'use':62,111 'util':53 'utility-services' 'valid':166 'varieti':42 'via':10,25,131 'wallet':205 'x402':11,26,35,133 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"03fab591-b23d-4911-bcc7-354e56638803","listingId":"b23e806f-8433-4c9c-8839-105a61d250f4","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:14.588Z"}],"sources":[{"listingId":"b23e806f-8433-4c9c-8839-105a61d250f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:14.588Z","lastSeenAt":"2026-04-22T18:31:26.071Z"}],"details":{"listingId":"b23e806f-8433-4c9c-8839-105a61d250f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/125 \\\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":"All 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 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/125"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility microservice paid in USDC","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["Developers and agents who want zero-signup, pay-per-use API access","Use cases requiring small, infrequent API calls where subscription pricing is wasteful","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.993Z"},"updatedAt":"2026-04-22T18:31:26.071Z"}}