{"id":"45dd8732-3c0a-4d63-a631-640b9dd5320a","shortId":"7CBF84","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/371` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\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 share the same $0.02 per-request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles in USDC on Base (contract 0x8335…2913).\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 example payloads available. The specific functionality behind the `/api/v1/charges/371` \"Premium API Access\" endpoint is unclear and may simply be a generic charge endpoint rather than a distinct service.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","x402 data api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI spec or request/response schema available for any endpoint","The specific functionality of /api/v1/charges/371 ('Premium API Access') is undefined — it may be a generic charge endpoint","No examples of successful responses are available anywhere in the crawled material","Cannot verify that the advertised AI, finance, data, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/371","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/371","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 schemas, no examples, and the specific purpose of the /api/v1/charges/371 endpoint is unclear beyond its label 'Premium API Access'. The platform lists many endpoint categories but provides no technical detail for any of 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'/api/v1/charges/371':65,221 '/docs':184 '/pricing':186 '/readme':188 '/request':17,34 '0.02':16,33,84,154 '000':79 '0x8335':177 '20':78 '2913':178 'accept':167 'access':45,70,224 'advertis':110 'ai':10,27,122 'ai-inference' 'analysi':126 'analyt':116 'api':4,21,41,69,98,223 'avail':215 'base':7,24,59,80,175 'base usdc api' 'base-network' 'behind':51,219 'broader':108 'call':87 'categori':112 'challeng':161 'charg':234 'classif':129 'classification' 'confirm':162 'connect':194 'contract':176 'convers':146 'data':9,26,115,119 'data-analytics' 'detail':201 'distinct':239 'document':179,210 'embed':130 'embeddings' 'endpoint':14,31,50,63,114,150,164,225,235 'estim':140 'exact':94 'exampl':213 'exchang':135 'export':120 'extrem':181 'feed':134 'financ':11,28,131 'finance-data' 'four':111 'function':218 'gas':139 'gate':3,20,44 'generat':147 'generic':233 'geocod':144 'geocoding' 'infrastructur':142 'insight':121 'key':99 'label':67 'learn':124 'limit':102 'list':149 'live':166 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'made':90 'marketplac':42 'may':229 'metric':117 'micropay':56 'micropayment api' 'network':60 'no-api-key' 'offer':8,25 'openapi':205 'page':189 'pay-per-request api' 'payload':214 'payment':74,88 'per':53,86,156 'per-request':52,155 'per-request-billing' 'platform':5,22,109 'post':168 'premium':68,222 'price':133,158 'prompt':196 'protocol':40 'quot':138 'rate':101,136 'rather':236 'render':191 'report':118 'request':54,157,169 'request/response':208 'requir':72,106 'schema':209 'scheme':95 'sentiment':125 'sentiment-analysis' 'servic':240 'settl':171 'share':151 'simpli':230 'spars':182 'spec':206 'specif':62,217 'subscript':105 'summar':128 'technic':200 'text':127 'text-summarization' 'token':137 'unclear':227 'unit':81 'usd':85 'usdc':55,83,173 'usdc-micropayment' 'util':13,30,143 'utility-apis' 'valid':145 'varieti':48 'via':91 'wallet':195 'web3':132 'x402':2,19,39,93,160 'x402 api' 'x402 data api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"398f29db-d07b-403e-a9e1-08cd6e642b2d","listingId":"45dd8732-3c0a-4d63-a631-640b9dd5320a","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/371","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:18.709Z"}],"sources":[{"listingId":"45dd8732-3c0a-4d63-a631-640b9dd5320a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/371","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:18.709Z","lastSeenAt":"2026-04-23T01:01:24.229Z"}],"details":{"listingId":"45dd8732-3c0a-4d63-a631-640b9dd5320a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/371 \\\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 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/371"},{"claim":"All listed 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 four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/371"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates via micropayment","Running utility operations like geocoding or data validation on a pay-per-use basis","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-call over subscriptions","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Developers who need comprehensive API docs, request/response schemas, and sandbox environments","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.913Z"},"updatedAt":"2026-04-23T01:01:24.229Z"}}