{"id":"2abdb1e2-2b1b-46b7-a282-0ad2c3c3bbda","shortId":"2qH2eV","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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/payments/396` is labeled \"Premium API Access\" and returns a valid x402 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 call — consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme, settling to the specified wallet address with a 300-second timeout.\n\nThe platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, API, README) all returned 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 actual functionality behind this particular `/payments/396` endpoint is unclear — the description is simply \"Premium API Access\" with no further specification of what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto pay API"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no useful content","The specific functionality of /api/v1/payments/396 ('Premium API Access') is not documented — unclear what it actually returns","No examples or sample payloads are available anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/396","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/payments/396","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schemas, and no examples. The actual functionality behind this specific endpoint is undescribed beyond the generic label 'Premium API Access'. All doc pages return only 'Connect wallet' with no 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'/payments/396':214 '/request':13,28 '0.02':12,27,62,120 '000':103 '0x8335':108 '20':102 '2913':109 '300':147 '6':115 'Base network API' 'USDC micropayment API' 'access':92,224 'across':45 'actual':209 'address':144 'advertis':128,152 'ai':48 'ai-inference' 'analysi':156 'analyt':47 'api':5,20,37,74,91,180,223 'avail':207 'base':8,23,70,104,111 'behind':211 'call':4,19,122 'categori':56 'challeng':98 'classif':159 'commit':81 'connect':186 'consist':123 'convers':171 'crypto pay API' 'data':46,173,231 'data-analytics' 'decim':116 'descript':219 'detail':193 'doc':178 'document':176,202 'embed':160 'enabl':36 'endpoint':44,58,85,153,215 'estim':168 'exact':137 'exampl':205 'exchang':163 'feed':162 'financ':51 'finance-data' 'flat':129 'function':210 'gas':167 'generat':174 'geocod':169 'howev':175 'infrastructur':54 'key':75 'label':89 'learn':50 'limit':78 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':133 'network':9,24,71 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':197 'page':177 'particular':213 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':65 'payload':206 'payment':131 'per':3,18,63,121 'platform':6,21,38,151 'premium':90,222 'price':60,130,161,179 'prompt':188 'quot':166 'rate':77,164 'readm':181 'request':64,99 'request/response':200 'requir':82 'return':94,183,235 'schema':201 'scheme':138 'second':148 'sentiment':155 'servic':233 'settl':139 'simpli':221 'sinc':112 'site':126 'spec':198 'specif':84,228 'specifi':142 'summar':158 'technic':192 'text':157 'timeout':149 'token':165 'translat':118 'unclear':217 'unit':105 'usdc':15,30,67,107,113 'usdc-base-network' 'use':114 'util':55 'utility-services' 'valid':96,170 'varieti':42 'via':10,25,134 'wallet':143,187 'web3':52 'x402':11,26,35,97,136 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"dbfa8497-992c-4a69-b325-6be747eae49b","listingId":"2abdb1e2-2b1b-46b7-a282-0ad2c3c3bbda","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/payments/396","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:44.657Z"}],"sources":[{"listingId":"2abdb1e2-2b1b-46b7-a282-0ad2c3c3bbda","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/396","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:44.657Z","lastSeenAt":"2026-04-23T02:01:19.786Z"}],"details":{"listingId":"2abdb1e2-2b1b-46b7-a282-0ad2c3c3bbda","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/396 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/396"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Performing utility operations like geocoding, validation, and data conversion on a per-call payment basis"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle x402 micropayments in USDC on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.308Z"},"updatedAt":"2026-04-23T02:01:19.786Z"}}