{"id":"81592366-033c-4049-8273-21022a7df41f","shortId":"LmBbA6","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 offers a collection of x402-enabled API endpoints accessible via per-request USDC micropayments on the Base network. The specific endpoint at /api/resource/19 is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe broader platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing. The payment is settled on-chain to address 0x1A2B…85F3 using USDC (contract 0x8335…2913) on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind /api/resource/19 is not described beyond the generic \"Premium API Access\" label, making it unclear what data or service it actually returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The specific functionality of /api/resource/19 ('Premium API Access') is completely undocumented","Cannot verify what data or service is returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/resource/19","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/resource/19","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/resource/19 actually does, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'/api/resource/19':62,221 '/docs':185 '/pricing':187 '/readme':189 '/request':18,36,160 '0.02':17,35,83,159 '000':77 '0x1a2b':171 '0x8335':176 '20':76 '2913':177 '402':71 '85f3':172 'Base network API' 'USDC pay-per-call' 'access':47,67,109,230 'across':117 'actual':240 'address':170 'advertis':93,115 'ai':12,30,127 'analysi':131 'analyt':11,29,121 'api':5,23,45,66,87,229 'attach':96 'avail':216 'base':8,26,56,78,179 'base-network' 'behind':220 'beyond':225 'broader':113 'call':4,22,85 'caller':94 'categori':119 'chain':168 'challeng':72 'classif':134 'collect':40 'connect':195 'contract':175 'convers':151 'cover':10,28 'crypto API access' 'data':120,124,236 'describ':224 'detail':202 'document':180,211 'embed':135 'enabl':44 'endpoint':46,60,116,155 'estim':145 'exampl':214 'exchang':140 'export':125 'extrem':182 'feed':139 'financ':13,31,136 'four':118 'function':219 'gas':144 'generat':152 'generic':227 'geocod':149 'header':101 'i.e':82 'infrastructur':147 'insight':126 'json-response' 'key':88 'label':64,231 'learn':129 'limit':91 'list':154 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':128 'make':232 'metric':122 'micropay':53 'micropayment API' 'network':57 'no-api-key' 'offer':38 'on-chain':166 'openapi':206 'page':190 'pay':2,20 'pay-per-cal':1,19 'pay-per-request' 'payload':215 'payment':100,106,163 'per':3,21,50,84 'per-request':49 'platform':114 'post-method' 'premium':65,228 'price':138,161 'prompt':197 'proof':107 'quot':143 'rate':90,141 'render':192 'report':123 'request':51,73 'request/response':209 'resourc':111 'return':69,241 'schema':210 'sentiment':130 'servic':238 'settl':165 'share':156 'simpli':95 'spars':183 'spec':207 'specif':59,218 'suit':6,24 'summar':133 'technic':201 'text':132 'token':142 'unclear':234 'unit':79 'usdc':9,27,52,81,174 'usdc-micropayment' 'use':173 'util':15,33,148 'valid':104,150 'via':48 'wallet':196 'web3':137 'x':99 'x-payment':98 'x402':43,105 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"239e7c50-d662-4fe6-b71d-eb7827266bde","listingId":"81592366-033c-4049-8273-21022a7df41f","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/resource/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:19.473Z"}],"sources":[{"listingId":"81592366-033c-4049-8273-21022a7df41f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:19.473Z","lastSeenAt":"2026-04-23T10:30:29.923Z"}],"details":{"listingId":"81592366-033c-4049-8273-21022a7df41f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/19 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/resource/19"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/19"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources without traditional API key registration","Making one-off data or AI inference requests paid per call via USDC on Base","Integrating pay-as-you-go API calls into autonomous agent workflows"],"bestFor":["Developers who want keyless, pay-per-request API access","AI agents with Base USDC wallets needing on-demand API calls","Prototyping workflows that require low-commitment API usage"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where subscription pricing is more economical","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.23Z"},"updatedAt":"2026-04-23T10:30:29.923Z"}}