{"id":"24ba3df4-5183-4120-82b1-9256ee30b620","shortId":"NXm3Zy","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. 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 sign-up — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/39` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also hosts endpoints for 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 crawled material. The endpoint is confirmed live (returns 402 with a well-formed x402 challenge), but without documentation it is unclear what request body this particular endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","per-call-pricing","no-api-key","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","no-auth api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for this endpoint","The purpose and expected input of /api/v1/payments/39 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/39","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/payments/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The specific purpose of /api/v1/payments/39 ('Premium API Access') is undocumented, making it effectively a stub 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'/api/v1/payments/39':109 '/docs':182 '/pricing':183 '/readme':186 '/request':12,28 '0.02':11,27,63,139,174 '0x8335':133 '20000':127 '2913':134 '402':223 '402 payment api' '6':143 'accept':117 'access':115 'advertis':123 'ai-inference' 'ai/ml':51 'also':147 'analysi':152 'analyt':50 'api':5,14,21,30,39,81,114 'attach':93 'avail':212 'base':8,24,71,128,136 'base network api' 'bodi':239 'broad':44 'call':4,20 'caller':91 'catalog':45 'challeng':122,230 'classif':155 'classification' 'confirm':220 'connect':192 'content':198 'contract':132 'convers':167 'crawl':215 'crypto-data' 'data':49,54 'data-analytics' 'decim':144 'document':177,207,233 'embed':156 'embeddings' 'enabl':38 'endpoint':47,59,107,149,218,242 'equal':138 'estim':164 'everi':58 'exampl':211 'exchang':159 'expect':243 'extrem':179 'feed':158 'finance-data' 'finance/web3':53 'form':228 'gas':163 'generat':169 'geocod':165 'geocoding' 'given':140 'header':98 'host':148 'infer':52 'key':15,31,82 'limit':85 'list':111 'live':221 'low payment fee' 'lowpaymentfee.com':33 'materi':216 'maxamountrequir':125 'micropayment api' 'network':72 'no-api-key' 'no-auth api' 'offer':42 'openapi':202 'page':187 'paid':66 'particular':241 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'payment':76,97,103 'per':3,19,64 'per-call-pricing' 'platform':6,22,40,146 'point':176 'post':118 'premium':113 'price':61,157,175 'prompt':194 'proof':104 'protocol':77 'quot':162 'rate':84,160 'render':189 'request':65,119,238 'request/response':205 'requir':16,32 'respons':246 'return':222,248 'schema':206 'sentiment':151 'sentiment-analysis' 'servic':57 'sign':89 'sign-up':88 'simpli':92 'span':48 'spars':180 'spec':203 'specif':106 'summar':154 'text':153 'text-summarization' 'token':161 'unclear':236 'unit':129 'usag':210 'usdc':68,131,141 'usdc api' 'usdc-base-network' 'util':56 'utility-services' 'valid':101,166 'via':9,25,73 'wallet':193 'well':227 'well-form':226 'without':232 'x':96 'x-payment':95 'x402':10,26,37,75,102,121,229 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"87df01ef-78f8-42f2-a500-c35660f5dd0e","listingId":"24ba3df4-5183-4120-82b1-9256ee30b620","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/payments/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:42.886Z"}],"sources":[{"listingId":"24ba3df4-5183-4120-82b1-9256ee30b620","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:42.886Z","lastSeenAt":"2026-04-22T15:01:39.486Z"}],"details":{"listingId":"24ba3df4-5183-4120-82b1-9256ee30b620","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/39"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Pay-per-call AI inference (sentiment, summarization, classification, embeddings)","Fetching real-time crypto token quotes and gas estimates","Geocoding and data conversion utilities with zero commitment"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Applications that cannot handle x402 payment flows or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.242Z"},"updatedAt":"2026-04-22T15:01:39.486Z"}}