{"id":"0e6dd261-0528-4e91-9265-5a1314a11226","shortId":"cqTURF","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/239` is labeled \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe site offers four broad categories of endpoints: 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 endpoints are priced uniformly at $0.02 per call.\n\nThe probed endpoint returns a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. However, the specific functionality of the `/api/v1/transactions/239` endpoint is unclear — the description simply says \"Premium API Access\" without detailing what data or service it returns. Documentation pages (docs, pricing, README) all rendered only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","json-response"],"categories":["api-platform","finance","ai"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment API"],"warnings":["The specific functionality of /api/v1/transactions/239 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) render only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, request body schema, or response examples are available.","The endpoint path '/api/v1/transactions/239' with a numeric ID suggests a resource-specific route, but what resource '239' refers to is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/239","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/239","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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/transactions/239 endpoint is undefined. All doc pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,72,136,160 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x8335':155 '20000':150 '300':174 '402 payment API' '6':164 'Base network API' 'USDC pay-per-call' 'accept':46,64 'access':62,88,193 'across':75 'address':170 'advertis':69 'ai':104 'analysi':108 'analyt':98 'api':5,20,38,61,81,192 'base':8,23,51,151,157 'broad':93 'call':4,19,138 'categori':94 'challeng':146 'classif':111 'connect':211 'content':217 'convers':128 'data':97,101,197 'decim':165 'descript':188 'detail':195 'doc':204 'document':202 'embed':112 'endpoint':55,78,96,131,141,184 'equal':159 'estim':122 'exchang':117 'export':102 'feed':116 'financ':113 'flat':71 'four':92 'function':180 'gas':121 'generat':129 'geocod':126 'given':161 'howev':177 'infrastructur':124 'insight':103 'instant':87 'json-response' 'key':82 'label':59 'learn':106 'limit':85 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':105 'maxamountrequir':148 'metric':99 'micropayment API' 'network':9,24,52 'offer':91 'page':203 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,166 'per':3,18,36,73,137 'platform':6,21,39,68 'post':65 'post-endpoint' 'premium':60,191 'price':115,133,205 'probe':140 'prompt':213 'protocol':44 'quot':120 'rate':84,118 'readm':206 'render':208 'report':100 'request':37,66,74 'return':142,201 'say':190 'second':175 'sent':168 'sentiment':107 'servic':199 'simpli':189 'site':90 'specif':54,179 'substant':216 'summar':110 'text':109 'timeout':176 'token':119 'unclear':186 'uniform':134 'unit':152 'usdc':15,30,47,154,162 'usdc-base' 'use':41 'util':125 'valid':127,144 'via':10,25 'wallet':212 'web3':114 'without':194 'x402':11,26,43,145 'x402 API' 'x402-payment'","prices":[{"id":"ab650c70-ce1e-46b9-98fd-587b886736fa","listingId":"0e6dd261-0528-4e91-9265-5a1314a11226","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/239","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:32.397Z"}],"sources":[{"listingId":"0e6dd261-0528-4e91-9265-5a1314a11226","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/239","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:32.397Z","lastSeenAt":"2026-04-22T12:04:36.178Z"}],"details":{"listingId":"0e6dd261-0528-4e91-9265-5a1314a11226","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/239 \\\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":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/239"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/239"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no-commitment, no-subscription API billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.019Z"},"updatedAt":"2026-04-22T12:04:36.178Z"}}