{"id":"772106da-0396-4cf2-bea6-995f1d6ec73f","shortId":"gRn6ZW","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/65` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider platform advertises four endpoint 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 platform claims no rate limits and instant access.\n\nImportant caveat: the specific functionality behind `/api/v1/keys/65` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","micropayment API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available for what /api/v1/keys/65 ('Premium API Access') actually returns upon successful payment","No OpenAPI or JSON schema describing request parameters or response format","Docs, pricing, and README pages are gated behind wallet connect and returned no useful content","The platform lists many endpoint categories but none have documented schemas or examples","Unclear whether all advertised endpoints (AI, finance, data, utils) are actually functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/65","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/keys/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and the platform landing page provides a catalog overview and pricing. However, there is no OpenAPI schema, no request/response examples, no documentation for what /api/v1/keys/65 actually returns, and the docs/pricing/README pages are all behind a wallet-connect gate. The specific functionality of this endpoint is entirely 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'/request':19,38,168 '0.02':18,37,79,167 '000':83 '20':82 '402':229 '6':89 'Base network API' 'USDC API' 'access':74,178,188 'account':101 'actual':234 'addit':219 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,73,99,187 'attach':107 'base':8,27,63,84 'base-network' 'behind':184 'beyond':192 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':127 'caveat':180 'challeng':230 'claim':172 'classif':142 'confirm':224 'connect':215 'convers':159 'cost':76 'crawl':205 'data':11,30,128,132 'data-analytics' 'decim':90 'detail':220 'doc':206 'document':191 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,222 'estim':153 'exampl':202 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'function':183 'gas':152 'generat':160 'geocod':157 'handl':93 'header':112 'import':179 'infrastructur':155 'insight':134 'instant':177 'key':100 'learn':137 'limit':175 'list':70,162 'live':225 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':198 'page':209 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,111,117,238 'per':3,22,55,80 'platform':6,25,46,123,171 'premium':72,186 'price':146,169,208 'prompt':216 'protocol':97 'provid':48 'quot':151 'rate':149,174 'report':131 'request':56,120 'request/response':201 'requir':105 'return':210,226,235 'schema':199 'sentiment':138 'settl':58 'share':164 'sign':115 'specif':66,182 'subscript':103 'success':237 'summar':141 'text':140 'titl':194 'token':150 'unit':85 'unknown':240 'upon':236 'usdc':9,28,60,87,116 'usdc-settlement' 'util':15,34,156 'utility-services' 'valid':158,228 'via':94 'wallet':214 'wallet-connect':213 'web3':145 'wider':122 'x':110 'x-payment':109 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"711205d2-6dd4-4282-bb1d-49ec2f97e940","listingId":"772106da-0396-4cf2-bea6-995f1d6ec73f","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/keys/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.567Z"}],"sources":[{"listingId":"772106da-0396-4cf2-bea6-995f1d6ec73f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.567Z","lastSeenAt":"2026-04-22T01:02:18.926Z"}],"details":{"listingId":"772106da-0396-4cf2-bea6-995f1d6ec73f","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a signed USDC payment on Base.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/keys/65\n# Returns 402 with x402 payment challenge.\n# Attach a valid X-PAYMENT header (signed USDC transfer of 0.02 USDC) to complete the call.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/65"},{"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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USD Coin (USDC) on the Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/keys/65"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) with per-call billing","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayments","Utility operations like geocoding, validation, and data conversion paid per request"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing with no commitments","Applications on the Base/USDC ecosystem looking for native crypto-settled APIs"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up and bulk pricing would be preferred","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.552Z"},"updatedAt":"2026-04-22T01:02:18.926Z"}}