{"id":"196c3d36-b2d6-44f0-9d41-fff08445a686","shortId":"e5n7BS","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. The platform advertises $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific probed endpoint (`/api/v1/transactions/69`) is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, 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 actual functionality behind these endpoints is unverified beyond the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment protocol"],"warnings":["Documentation pages (docs, API, pricing, README) all return only a 'Connect wallet' prompt with no usable content.","No OpenAPI or schema documentation is available — request and response formats are unknown.","The specific functionality of /api/v1/transactions/69 ('Premium API Access') is unclear; the name is generic.","The breadth of advertised endpoints (AI, finance, analytics, utils) is unverified; actual capabilities may differ from listings."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/69","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/69","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 exists and accepts payment at $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind 'Premium API Access' and the many listed endpoints is entirely 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'/request':13,30 '0.02':12,29,81,123,126,179 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':140 '20':117 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':143 'access':107 'across':84 'actual':223 'address':134 'advertis':80 'ai/ml':53 'analysi':156 'analyt':52 'api':5,15,22,32,41,89,106,189 'application/json':148 'avail':218 'base':8,25,71,119,128 'behind':225 'beyond':230 'broad':46 'broader':150 'call':4,21 'challeng':113,233 'classif':159 'commit':97 'connect':198 'content':204 'contract':139 'convers':171 'crawl':221 'crypto API payment' 'data':51,56,173 'doc':188 'document':183,213 'embed':160 'enabl':40 'endpoint':49,61,86,101,142,153,227 'estim':168 'exampl':217 'exchang':163 'extrem':185 'feed':162 'finance/web3':55 'function':224 'gas':167 'generat':174 'geocod':169 'howev':182 'i.e':125 'infer':54 'json-response' 'key':16,33,90 'label':104 'limit':93 'list':152 'lowpaymentfee' 'lowpaymentfee.com':35 'made':132 'minimum':96 'network':9,26,72 'no-api-key' 'offer':44 'openapi':208 'page':193 'pay':2,19,64 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':63 'payment':130 'per':3,20,65,82 'platform':6,23,42,79,151 'point':181 'post':144 'post-method' 'premium':105 'price':161,180,190 'probe':100 'prompt':200 'protocol':77 'quot':166 'rate':92,164 'readm':192 'render':195 'request':66,83,114,145 'request/response':211 'requir':17,34 'return':109,147 'schema':212 'sentiment':155 'servic':59 'set':47 'settl':73 'span':50 'spars':186 'spec':209 'specif':99 'summar':158 'text':157 'token':165 'unit':120 'unverifi':229 'usag':216 'usdc':68,122,124,138 'usdc-base-network' 'use':67,136 'util':58 'valid':111,170 'via':10,27,74 'wallet':199 'x402':11,28,39,76,112,232 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"680489b2-30a1-4e84-a9b5-3672d85e6551","listingId":"196c3d36-b2d6-44f0-9d41-fff08445a686","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:52.647Z"}],"sources":[{"listingId":"196c3d36-b2d6-44f0-9d41-fff08445a686","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:52.647Z","lastSeenAt":"2026-04-22T18:32:37.010Z"}],"details":{"listingId":"196c3d36-b2d6-44f0-9d41-fff08445a686","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# Using curl with a hypothetical x402 client:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/69 \\\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":"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 (0.02 USDC) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/69"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/69"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using USDC on Base","Integrating pay-per-use analytics, AI inference, or financial data into workflows"],"bestFor":["Developers wanting zero-friction API access with crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Projects needing simple pay-as-you-go API access without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with negotiated pricing","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.701Z"},"updatedAt":"2026-04-22T18:32:37.010Z"}}