{"id":"b48dae7a-4a33-48f1-8840-363ce5fefd20","shortId":"2hyDgN","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, 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 utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment 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/messages/150` is listed as \"Premium API Access\" and follows the same x402 scheme. Its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. No detailed input/output schema beyond the x402 challenge metadata is published, so the exact payload format for this particular messages endpoint is unknown.\n\nThe broader platform advertises additional categories of endpoints: sentiment analysis, text summarization, classification, embeddings (AI/ML); metrics, reports, data export, insights (analytics); price feeds, exchange rates, token quotes, gas estimates (finance/Web3); and geocoding, validation, conversion, generation (utilities). All share the same $0.02 pricing and x402 payment flow on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","analytics","finance-data","crypto-data","geocoding","data-export","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","machine learning API","analytics API"],"warnings":["No input or output schema documented for /api/v1/messages/150 — callers must guess the payload format.","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The purpose of the 'messages/150' endpoint is ambiguous; 'Premium API Access' is a generic label applied across the platform.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/150","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no input/output schema documentation, no example requests or responses, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content. The purpose of the specific /messages/150 path is 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'/request':18,36 '0.02':17,35,67,139,216 '000':129 '0x8335':134 '20':128 '402':122 '6':143 'Base network API' 'USDC micropayment API' 'accept':147 'access':114 'addit':180 'advertis':124,179 'ai':11,29 'ai-inference' 'ai/ml':55,190 'analysi':185 'analyt':12,30,54,196 'analytics' 'analytics API' 'api':5,23,43,85,113 'application/json':152 'attach':96 'base':8,26,75,130,136,223 'beyond':157 'broad':48 'broader':177 'call':4,22 'caller':94 'categori':181 'challeng':123,160 'classif':188 'classification' 'collect':49 'commit':93 'convers':209 'cover':10,28 'crypto-data' 'crypto-paid API' 'data':53,58,193 'data-export' 'decim':144 'detail':154 'embed':189 'embeddings' 'enabl':42 'endpoint':51,63,106,146,173,183 'equal':138 'estim':204 'everi':62 'exact':166 'exchang':199 'export':194 'feed':198 'financ':13,31 'finance-data' 'finance/web3':57,205 'flow':221 'follow':116 'format':168 'gas':203 'general':60 'generat':210 'geocod':207 'geocoding' 'given':140 'header':100 'infer':56 'input/output':155 'insight':195 'key':86 'limit':89 'list':110 'low fee API' 'lowpaymentfee.com':37 'machine learning API' 'maxamountrequir':126 'messag':172 'metadata':161 'metric':191 'network':76 'offer':46 'paid':70 'particular':171 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':167 'payment':80,99,220 'per':3,21,68 'platform':44,178 'post':148 'premium':112 'price':65,197,217 'protocol':81 'publish':163 'quot':202 'rate':88,200 'report':192 'request':69,103,149 'return':151 'schema':156 'scheme':120 'sentiment':184 'sentiment-analysis' 'share':213 'simpli':95 'span':52 'specif':105 'suit':6,24 'summar':187 'text':186 'text-summarization' 'token':201 'unit':131 'unknown':175 'upfront':92 'usdc':9,27,72,133,141 'usdc-base' 'util':15,33,61,211 'utility-apis' 'valid':208 'via':77 'x402':41,79,98,119,159,219 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"dddd1f54-74de-4b01-a15f-1cdb39d4379d","listingId":"b48dae7a-4a33-48f1-8840-363ce5fefd20","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.404Z"}],"sources":[{"listingId":"b48dae7a-4a33-48f1-8840-363ce5fefd20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.404Z","lastSeenAt":"2026-04-22T05:32:16.341Z"}],"details":{"listingId":"b48dae7a-4a33-48f1-8840-363ce5fefd20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/150 \\\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":"All endpoints 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":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/150"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["AI agents making one-off inference calls (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-request USDC micropayments","Running analytics or data export jobs on demand with no subscription commitment","Geocoding or data validation as a lightweight utility service"],"bestFor":["Agents and bots that need keyless, pay-as-you-go API access","Developers wanting low-friction USDC micropayments on Base","Use cases requiring diverse endpoint categories (AI, finance, utilities) from a single provider"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discounts documented)","Users who need detailed API documentation, input schemas, or SLA guarantees","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.118Z"},"updatedAt":"2026-04-22T05:32:16.341Z"}}