{"id":"881d8386-b35b-4adc-aa1a-49280622282a","shortId":"NwEevN","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, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/197` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The platform also advertises 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 per call.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed descriptions of what each endpoint actually returns. The x402 challenge confirms the endpoint is live and accepting POST requests, but without documentation it is unclear what request body this particular endpoint expects or what response it produces.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request body and response format for /api/v1/transactions/197 are unknown","The endpoint path '/api/v1/transactions/197' with description 'Premium API Access' does not match any of the advertised API categories on the landing page, making its purpose unclear","Cannot verify that any of the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/197","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/transactions/197","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 confirms pricing and payment details, but documentation is effectively nonexistent — every doc page renders only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does beyond 'Premium API Access'. The endpoint's actual functionality cannot be 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'/request':13,28 '0.02':12,27,62,121,151 '000':110 '0x8335':115 '20':109 '2913':116 '402 payment api' 'accept':203 'access':100 'across':45 'actual':192 'advertis':105,125 'ai-inference' 'ai/ml':48 'also':124 'analysi':129 'analyt':47 'api':5,20,37,72,99,160 'attach':82 'base':8,23,69,111,118 'base network api' 'base-network' 'bodi':214 'call':4,19,153 'caller':80 'challeng':104,196 'classif':132 'classification' 'confirm':197 'connect':169 'content':175 'convers':144 'data':46 'data-analytics' 'descript':187 'detail':186 'doc':159 'document':154,208 'embed':133 'embeddings' 'enabl':36 'endpoint':44,55,92,126,191,199,217 'equal':120 'estim':141 'exampl':183 'exchang':136 'expect':218 'extrem':156 'feed':135 'finance-data' 'finance/web3':50 'gas':140 'generat':146 'geocod':142 'geocoding' 'header':86 'infer':49 'infrastructur':52 'key':73 'limit':75 'list':96 'live':201 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':107 'micropayment api' 'network':9,24,70 'offer':40 'openapi':179 'page':164 'particular':216 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85 'per':3,18,59,152 'platform':6,21,38,123 'post':204 'premium':98 'price':134,161 'produc':223 'prompt':171 'quot':139 'rate':74,137 'readm':163 'render':166 'request':60,89,205,213 'request/response':182 'requir':79 'respons':221 'return':193 'schema':180 'sentiment':128 'sentiment-analysis' 'settl':64 'simpli':81 'spars':157 'specif':91 'subscript':77 'summar':131 'text':130 'text-summarization' 'token':138 'unclear':211 'unit':112 'usdc':15,30,66,114 'usdc api' 'usdc-settlement' 'util':53 'utility-services' 'valid':143 'varieti':42 'via':10,25 'wallet':170 'without':207 'x402':11,26,35,84,103,195 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"291e33df-2274-426b-9324-ff122811cfa1","listingId":"881d8386-b35b-4adc-aa1a-49280622282a","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/transactions/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:07.198Z"}],"sources":[{"listingId":"881d8386-b35b-4adc-aa1a-49280622282a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/197","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:07.198Z","lastSeenAt":"2026-04-22T21:31:37.500Z"}],"details":{"listingId":"881d8386-b35b-4adc-aa1a-49280622282a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/197 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/197"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/197"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Using utility services like geocoding, validation, and data conversion with instant micropayments"],"bestFor":["Agents or developers who want zero-setup, pay-as-you-go API access","Use cases requiring no subscriptions, API keys, or rate limits","Crypto-native workflows already operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.152Z"},"updatedAt":"2026-04-22T21:31:37.500Z"}}