{"id":"35c9d38a-cabe-4f32-8b2b-2ed3efc2fb94","shortId":"YGGeps","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/100` is listed as \"Premium API Access\" and returns JSON. The x402 challenge confirms it is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0.02 USD) on Base to address `0x1A2B...85F3`. The broader platform advertises additional endpoints including 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 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response format of each endpoint can only be discovered by making paid calls.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","sentiment analysis api","text summarization api","embeddings api","crypto price feed"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all return only a 'Connect wallet' prompt with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/100 is undocumented","The broad range of advertised endpoints (AI, finance, analytics, utilities) at a uniform $0.02 price with no documentation raises questions about actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/100","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/100","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 challenge with clear pricing. However, documentation is effectively nonexistent — every doc page renders only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/transactions/100 endpoint is unclear beyond the generic 'Premium API Access' label. Significant inference was 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'/api/v1/transactions/100':109 '/docs':186 '/pricing':187 '/readme':190 '/request':18,36 '0.02':17,35,69,140,178 '000':135 '0x1a2b':146 '20':134 '85f3':147 'accept':126 'access':115 'actual':221 'addit':152 'address':145 'advertis':151 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':156 'analyt':11,29,54 'api':5,23,43,86,114 'attach':97 'avail':216 'base':8,26,77,136,143 'base network api' 'behavior':222 'broad':48 'broader':149 'call':4,22,236 'caller':95 'challeng':121 'classif':159 'collect':49 'commit':94 'confirm':122 'connect':196 'content':202 'convers':171 'conversion' 'cover':10,28 'crawl':219 'crypto price feed' 'crypto-gas-estimates' 'data':53,58 'data-analytics' 'discov':232 'document':181,211 'embed':160 'embeddings api' 'enabl':42 'endpoint':51,65,107,153,228 'estim':168 'everi':64 'exact':128 'exact-schem':127 'exampl':215 'exchang':163 'exchange-rates' 'extrem':183 'feed':162 'financ':13,31 'finance-prices' 'finance/web3':57 'format':225 'gas':167 'general':61 'general-purpos':60 'generat':173 'geocod':169 'geocoding' 'header':101 'includ':154 'infer':56 'json':118 'key':87 'limit':90 'list':111 'live':125 'low payment fee' 'lowpaymentfee.com':37 'make':234 'micropayment api' 'network':78 'offer':46 'openapi':206 'page':191 'paid':72,235 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':100,130 'per':3,21,70 'platform':44,150 'point':180 'premium':113 'price':67,161,179 'prompt':198 'protocol':82 'purpos':62 'quot':166 'rate':89,164 'render':193 'request':71,104 'request/response':209 'respons':224 'return':117 'schema':210 'scheme':129 'sentiment':155 'sentiment analysis api' 'simpli':96 'span':52 'spars':184 'spec':207 'specif':106 'suit':6,24 'summar':158 'text':157 'text summarization api' 'token':165 'unit':137 'upfront':93 'usag':214 'usd':141 'usdc':9,27,74,139 'usdc api' 'usdc-base' 'util':15,33,63 'valid':170 'validation' 'via':79 'wallet':197 'x402':41,81,99,120 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"4dbff0a3-94e1-4bcf-a1f4-513ac1386a92","listingId":"35c9d38a-cabe-4f32-8b2b-2ed3efc2fb94","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:16.160Z"}],"sources":[{"listingId":"35c9d38a-cabe-4f32-8b2b-2ed3efc2fb94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:16.160Z","lastSeenAt":"2026-04-22T13:31:43.367Z"}],"details":{"listingId":"35c9d38a-cabe-4f32-8b2b-2ed3efc2fb94","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live status with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/100"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Running AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates on a per-call basis","Geocoding addresses or validating data with zero upfront commitment","Exporting analytics data or generating insights reports pay-as-you-go","Integrating financial exchange rate lookups into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Low-volume or bursty workloads where subscription pricing is wasteful","x402-native applications already settling in USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and documented schemas","Users who need detailed API documentation or request/response contracts before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.465Z"},"updatedAt":"2026-04-22T13:31:43.367Z"}}