{"id":"a46cfcdd-c2c5-4b34-a902-7c7b3142c7ad","shortId":"EGUBFs","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 `/api/v1/transfers/124` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four 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 endpoints are listed at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transfers/124`) is labeled \"Premium API Access\" but its actual functionality is unclear — the crawled documentation pages returned only \"Connect wallet\" placeholders with no further detail on request/response schemas or what data the endpoint returns. The payment challenge confirms the endpoint is live and accepting POST requests, settling in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["No documentation available — all doc pages returned only 'Connect wallet' placeholder content","The specific functionality of /api/v1/transfers/124 is unknown; 'Premium API Access' is not descriptive","No request or response schema is provided beyond the x402 outputSchema stub","The endpoint path suggests a specific resource ID (124), which may not be generalizable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/124","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/transfers/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation on what the endpoint actually does, no request/response schema, and the docs/pricing/README pages all returned only 'Connect wallet' with no content. The endpoint path '/api/v1/transfers/124' with description 'Premium API Access' is too vague to determine 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'/request':13,28 '0.02':12,27,78,153 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':212 '20':71 '402':66 '402 payment api' 'accept':46,202 'access':62,92,164 'across':112 'actual':167 'address':211 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163 'attach':95 'base':8,23,51,73,209 'base network api' 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,195 'classif':129 'confirm':196 'connect':177 'convers':146 'crawl':172 'data':115,119,189 'detail':183 'document':173 'embed':130 'endpoint':55,111,149,158,191,198 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':161 'learn':124 'limit':89 'list':58,151 'live':200 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'page':174 'particular':157 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105,194 'per':3,18,36,79,154 'placehold':179 'platform':6,21,39,82,109 'post':203 'post-endpoint' 'premium':60,162 'price':133 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68,155,204 'request/response':185 'return':64,175,192 'schema':186 'sentiment':125 'settl':205 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':170 'unit':74 'usdc':15,30,47,76,207 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':178 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"c692f7ad-4abe-4c43-92e6-3ffc82874de4","listingId":"a46cfcdd-c2c5-4b34-a902-7c7b3142c7ad","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/transfers/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:15.481Z"}],"sources":[{"listingId":"a46cfcdd-c2c5-4b34-a902-7c7b3142c7ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:15.481Z","lastSeenAt":"2026-04-23T06:31:40.562Z"}],"details":{"listingId":"a46cfcdd-c2c5-4b34-a902-7c7b3142c7ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/124 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/124"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/124"}],"useCases":["Programmatic access to premium API data without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents that need keyless, instant API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or well-defined response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.618Z"},"updatedAt":"2026-04-23T06:31:40.562Z"}}