{"id":"df07b169-4474-4993-b04a-0bd42d142d6d","shortId":"e275R3","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/68` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 protocol — no API keys, no subscriptions, just a per-request USDC micropayment.\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 site claims no API keys are required, no rate limits are enforced, and access is instant.\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 crawl. The exact functionality behind the `/api/v1/transactions/68` path is unclear; the name \"Premium API Access\" is generic and does not describe a specific capability. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The endpoint path '/api/v1/transactions/68' and label 'Premium API Access' are generic and do not describe a specific capability","No examples or sample responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/68","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/transactions/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI spec, no request/response documentation, no examples, and the endpoint name 'Premium API Access' is entirely generic. The docs pages are empty. The actual functionality behind this specific path is 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'/api/v1/transactions/68':69,218 '/docs':179 '/pricing':180 '/readme':183 '/request':19,38,155 '0.02':18,37,86,154 '000':80 '20':79 'Base network API' 'USDC API' 'access':74,171,226 'advertis':111 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'api':5,24,45,73,97,161,225 'avail':209 'base':8,27,63,81 'base-network' 'behind':216 'broad':50 'call':4,23,88 'capabl':235 'catalog':51 'categori':114 'challeng':238 'charg':76 'claim':159 'classif':129 'confirm':245 'connect':189 'content':195 'convers':146 'cover':10,29 'crawl':212 'crypto-paid API' 'data':11,30,115,119 'data-analytics' 'describ':232 'document':174,204 'embed':130 'enabl':44 'endpoint':16,35,57,67,113,150,247 'enforc':169 'estim':140 'exact':214 'exampl':208 'exchang':135 'export':120 'extrem':176 'feed':134 'financ':13,32,131 'finance-data' 'form':244 'four':112 'function':215 'gas':139 'generat':147 'generic':228 'geocod':144 'handl':91 'i.e':85 'infrastructur':142 'insight':121 'instant':173 'key':98,162 'label':71 'learn':124 'limit':167 'list':149 'live':240 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'metric':117 'micropay':107 'micropayment API' 'name':223 'network':64 'no-api-key' 'offer':48 'openapi':199 'oper':249 'page':184 'path':219 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':89 'per':3,22,55,87,104 'per-request':103 'platform':6,25,46,110 'premium':72,224 'price':133,156 'prompt':191 'protocol':95 'quot':138 'rate':136,166 'render':186 'report':118 'request':56,105 'request/response':202 'requir':164 'schema':203 'sentiment':125 'settl':58 'share':151 'site':158 'spars':177 'spec':200 'specif':66,234 'subscript':100 'summar':128 'text':127 'token':137 'unclear':221 'unit':82 'usag':207 'usdc':9,28,60,84,106 'usdc-micropayment' 'util':15,34,143 'utility-services' 'valid':145 'via':92 'wallet':190 'web3':132 'well':243 'well-form':242 'wider':109 'x402':43,94,237 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6e11f9e4-4d9b-49f0-8061-d40904bf7c24","listingId":"df07b169-4474-4993-b04a-0bd42d142d6d","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/transactions/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:03.385Z"}],"sources":[{"listingId":"df07b169-4474-4993-b04a-0bd42d142d6d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:03.385Z","lastSeenAt":"2026-04-22T16:32:14.739Z"}],"details":{"listingId":"df07b169-4474-4993-b04a-0bd42d142d6d","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/68 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/68"},{"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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/68"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Developers who want pay-per-use API access without API key management","Agents and bots that can settle payments in USDC on Base via x402","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, schemas, or example responses before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.211Z"},"updatedAt":"2026-04-22T16:32:14.739Z"}}