{"id":"b5978b9d-99a6-435f-beec-e7279f7f25e4","shortId":"JByYYP","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/27` is labeled \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol: callers attach an X-PAYMENT header with a signed payment proof, and the server fulfills the request once payment is verified. No API keys, accounts, or rate limits are advertised.\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 are listed at $0.02 per request on the landing page.\n\nThe specific functionality behind `/api/v1/messages/27` is unclear — the description is simply \"Premium API Access\" with no further documentation, schema, or example responses available. The crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no additional content. Treat this endpoint with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /api, /pricing, and /README pages all return only 'Connect wallet' with no content.","The purpose of /api/v1/messages/27 is unknown; 'Premium API Access' is the only description provided.","No request or response schema is documented; callers must guess at the expected input format.","No examples of successful responses are available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/27","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/messages/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what /api/v1/messages/27 actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/messages/27':60,178 '/pricing':202 '/readme':203 '/request':19,38 '0.02':18,37,70,167 '000':76 '20':75 '6':82 'Base network API' 'USDC pay-per-call' 'access':65,187 'account':116 'addit':213 'advertis':121,125 'ai':12,31,137 'analysi':141 'analyt':131 'api':5,24,47,64,114,186 'attach':92 'avail':196 'base':8,27,54,77 'base-network' 'behind':177 'broader':123 'call':4,23 'caller':91 'categori':127 'caution':219 'classif':144 'collect':42 'connect':208 'content':214 'convers':161 'cost':67 'cover':10,29 'crawl':198 'crypto-paid API' 'data':11,30,130,134 'decim':83 'descript':182 'doc':199 'document':191,222 'embed':145 'enabl':46 'endpoint':16,35,48,58,129,217 'estim':155 'exampl':194 'exchang':150 'export':135 'feed':149 'financ':13,32,146 'four':126 'fulfil':106 'function':176 'gas':154 'generat':162 'geocod':159 'handl':86 'header':97 'host':40 'http-post' 'infrastructur':157 'insight':136 'key':115 'label':62 'land':172 'learn':139 'limit':119 'list':165 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'maxamountrequir':73 'metric':132 'micropayment API' 'network':55 'no-api-key' 'page':173,200 'pay':2,21 'pay-per-cal':1,20 'pay-per-request' 'payment':84,96,101,110 'per':3,22,71,168 'platform':124 'premium':63,185 'price':148 'prompt':210 'proof':102 'protocol':90 'quot':153 'rate':118,151 'report':133 'request':72,108,169 'respons':195 'return':205 'schema':192 'sentiment':140 'server':105 'settl':49 'sign':100 'simpli':184 'specif':57,175 'suit':6,25 'summar':143 'surfac':223 'text':142 'token':152 'treat':215 'unclear':180 'unit':78 'usdc':9,28,51,80 'usdc-settlement' 'util':15,34,158 'valid':160 'verifi':112 'via':87 'wallet':209 'web3':147 'x':95 'x-payment':94 'x402':45,89 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"c6aa92d3-5ffc-43d1-90e5-d182a6a93fbe","listingId":"b5978b9d-99a6-435f-beec-e7279f7f25e4","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/messages/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.879Z"}],"sources":[{"listingId":"b5978b9d-99a6-435f-beec-e7279f7f25e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.879Z","lastSeenAt":"2026-04-22T02:32:07.910Z"}],"details":{"listingId":"b5978b9d-99a6-435f-beec-e7279f7f25e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/27 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/27","body":{},"method":"POST","headers":{"X-PAYMENT":"<signed-x402-payment-proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/27"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/27"},{"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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing an account or API key","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need frictionless, keyless API access settled on-chain","Low-volume consumers who prefer pay-as-you-go over subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.408Z"},"updatedAt":"2026-04-22T02:32:07.910Z"}}