{"id":"c1fab308-5fcb-4171-b642-3fb7d9c08d50","shortId":"LHsaRK","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/176` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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 beyond the landing page 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 usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/transactions/176 ('Premium API Access') is not explained anywhere","No examples of successful responses are available to verify endpoint functionality","The platform lists many endpoint categories but none have documented schemas or sample payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/176","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of this specific '/transactions/176' endpoint is unclear beyond the generic 'Premium API Access' label. The listing is effectively a 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'/api/v1/transactions/176':111 '/docs':201 '/pricing':203 '/readme':205 '/request':13,28 '0.02':12,27,64,141,188 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':135 '20':129 '2913':136 '300':155 '402 payment api' '6':145 'accept':119 'access':117 'across':50 'address':151 'advertis':125,161 'ai/ml':53 'analysi':165 'analyt':52 'api':5,20,37,76,116 'attach':92 'avail':232 'base':8,23,72,131,138 'base network api' 'beyond':193 'broad':42 'broader':159 'call':4,19 'caller':91 'catalog':43 'challeng':124 'classif':168 'connect':211 'convers':180 'crawl':235 'data':51,182 'decim':146 'detail':218 'document':192,227 'embed':169 'enabl':36 'endpoint':49,60,109,162 'equal':140 'estim':177 'exampl':231 'exchang':172 'extrem':198 'feed':171 'finance/web3':55 'gas':176 'generat':183 'geocod':178 'given':142 'handl':88 'header':95 'howev':191 'http':98 'immedi':104 'infer':54 'infrastructur':57 'inlin':90 'key':77 'land':195 'limit':80 'list':113 'low payment fee' 'lowpaymentfee.com':31 'materi':236 'maxamountrequir':127 'micropayment api' 'network':9,24,73 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':222 'page':196,206 'paid':67 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payment':89,94,148 'per':3,18,47,65 'per-request-billing' 'platform':6,21,38,160 'point':190 'post':120 'post-endpoint' 'premium':115 'price':62,170,189 'prompt':213 'protocol':87 'quot':175 'rate':79,173 'receiv':101 'render':208 'request':48,66,99,121 'request/response':225 'requir':84 'respons':103 'schema':226 'second':156 'sentiment':164 'settl':149 'settlement':106 'spars':199 'spec':223 'specif':108 'subscript':83 'summar':167 'technic':217 'text':166 'timeout':157 'token':174 'unit':132 'upon':105 'usag':230 'usdc':15,30,69,134,143 'usdc api' 'usdc-base' 'util':58 'valid':179 'via':10,25 'wallet':212 'x402':11,26,35,86,123 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"54c5e862-5774-4fed-967e-b852d847bd66","listingId":"c1fab308-5fcb-4171-b642-3fb7d9c08d50","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:50.351Z"}],"sources":[{"listingId":"c1fab308-5fcb-4171-b642-3fb7d9c08d50","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:50.351Z","lastSeenAt":"2026-04-22T17:02:12.954Z"}],"details":{"listingId":"c1fab308-5fcb-4171-b642-3fb7d9c08d50","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/176 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/176"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generic API endpoint with inline USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need frictionless pay-per-call access without API key management","Low-volume consumers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring predictable throughput and error handling","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.992Z"},"updatedAt":"2026-04-22T17:02:12.954Z"}}