{"id":"03d424ce-aa36-45c5-bc8f-c249de0fa6c5","shortId":"cJ4xeT","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint `/api/v1/messages/116` is listed as \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe platform advertises four categories of APIs: 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 endpoints are priced uniformly at $0.02 per request.\n\nThe probed endpoint at `/api/v1/messages/116` returned a valid x402 challenge with a `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns `application/json`. However, the specific functionality of the `/messages/116` endpoint is unclear — it does not appear in the site's listed API catalog, and no documentation, request schema, or response schema is available for it. Without further documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["The /api/v1/messages/116 endpoint does not appear in the site's published API catalog — its purpose is unclear.","No request or response schema is available for this endpoint.","Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","The platform lists many endpoint categories but provides no detailed documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/116","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific /messages/116 endpoint is not documented on the site's catalog, no request/response schemas are available, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content. The actual functionality of this endpoint is 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'/messages/116':182 '/request':11,26 '0.02':10,25,57,138,167 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':160 '20000':155 '402 payment API' '6':163 'Base network API' 'USDC pay-per-call' 'accept':170 'access':42,84 'actual':213 'advertis':94 'ai':106 'analysi':110 'analyt':100 'api':5,20,38,66,83,98,195 'appear':189 'application/json':175 'avail':206 'base':8,23,62,156,162 'behavior':214 'broad':45 'call':4,19,55 'catalog':196 'categori':96 'challeng':150 'classif':113 'convers':130 'cost':56 'data':99,103 'decim':164 'document':199,211 'embed':114 'endpoint':48,77,133,143,169,183,217 'equal':166 'estim':124 'exchang':119 'export':104 'feed':118 'financ':115 'follow':86 'four':95 'function':179 'gas':123 'gate':41 'generat':131 'geocod':128 'howev':176 'infrastructur':126 'insight':105 'json-api' 'key':67 'learn':108 'limit':70 'list':80,194 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':107 'maxamountrequir':153 'metric':101 'micropayment API' 'network':9,24,63 'no-api-key' 'pattern':91 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,52,90 'per':3,18,36,139 'platform':6,21,39,93 'post':171 'post-method' 'premium':82 'price':117,135 'probe':142 'protocol':53 'quot':122 'rate':69,120 'report':102 'request':37,140,172,200 'requir':74 'respons':203 'return':146,174 'schema':201,204 'sentiment':109 'set':46 'site':192 'specif':76,178 'subscript':73 'summar':112 'text':111 'token':121 'unclear':185 'uniform':136 'unit':157 'unknown':219 'usdc':14,29,59,159 'usdc-base-network' 'use':49 'util':127 'valid':129,148 'via':12,27 'web3':116 'without':209 'x402':13,28,51,89,149 'x402 API' 'x402-payment'","prices":[{"id":"73e7c5a1-569e-4f3e-a071-9aee63eed571","listingId":"03d424ce-aa36-45c5-bc8f-c249de0fa6c5","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.770Z"}],"sources":[{"listingId":"03d424ce-aa36-45c5-bc8f-c249de0fa6c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/116","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.770Z","lastSeenAt":"2026-04-22T02:32:05.850Z"}],"details":{"listingId":"03d424ce-aa36-45c5-bc8f-c249de0fa6c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/116 \\\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":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 returned maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/116"}],"useCases":["Accessing pay-per-call API services without API key management","Making micropayments for individual API requests using USDC on Base","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 USDC payments on Base","Users who prefer no-signup, no-rate-limit API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.069Z"},"updatedAt":"2026-04-22T02:32:05.850Z"}}