{"id":"9b299e4b-3c77-430c-a89b-7e383b8ddfc2","shortId":"QUd7aQ","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/wire/94` 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 lowpaymentfee.com site 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. However, the specific endpoint being listed here (`/api/v1/wire/94`) is labeled only as \"Premium API Access\" and does not appear in the public catalog of named endpoints, so its exact functionality is unclear.\n\nPayment settles on Base via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The x402 challenge uses the \"exact\" scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact functionality of /api/v1/wire/94 ('Premium API Access') is not documented anywhere on the site — it does not match any of the named endpoints in the public catalog.","Documentation pages (/docs, /pricing, /README, /api) returned no meaningful content beyond 'Connect wallet'.","No OpenAPI spec or request/response schema is available; callers cannot know what to send or expect back.","The platform's broader endpoint catalog lists many capabilities (AI, finance, analytics) but none are verified for this specific wire endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/94","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/wire/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/wire/94 is undocumented — it does not appear in the site's public endpoint catalog. No OpenAPI spec, no request/response schema, and all docs/pricing/README pages returned only a 'Connect wallet' stub with no useful 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'/request':13,28 '0.02':12,27,78,154 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':196 '20':71 '300':209 '402':66 '402 payment api' 'accept':46,214 'access':62,92,171 'across':113 'address':198 'advertis':83 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,85,170 'appear':175 'application/json':219 'attach':95 'base':8,23,51,73,192 'base network api' 'broader':108 'call':4,19,80 'caller':93 'catalog':179 'categori':115 'challeng':67,202 'classif':130 'contract':195 'convers':147 'data':116,120 'embed':131 'endpoint':55,112,150,160,182,213 'estim':141 'exact':185,205 'exchang':136 'export':121 'feed':135 'financ':132 'four':114 'function':186 'gas':140 'generat':148 'geocod':145 'header':100 'howev':157 'http':215 'http-post' 'i.e':77 'infrastructur':143 'insight':122 'instant':91 'json-response' 'key':86 'label':166 'learn':125 'limit':89 'list':58,152,162 'low payment fee' 'lowpaymentfee.com':31,109 'machin':124 'metric':118 'micropayment api' 'name':181 'network':9,24,52 'offer':111 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105,189 'per':3,18,36,79,155 'platform':6,21,39,82 'post':216 'premium':60,169 'price':134 'proof':106 'protocol':44 'public':178 'quot':139 'rate':88,137 'report':119 'request':37,68,156 'return':64,218 'scheme':206 'second':210 'sentiment':126 'settl':190 'simpli':94 'site':110 'specif':54,159 'summar':129 'text':128 'timeout':211 'token':138 'unclear':188 'unit':74 'usdc':15,30,47,76,194 'usdc api' 'usdc-base' 'use':41,203 'util':144 'valid':103,146 'via':10,25,193 'web3':133 'x':98 'x-payment':97 'x402':11,26,43,104,201 'x402 api' 'x402-payment'","prices":[{"id":"3ab75478-06e6-40d2-8a3d-cbec5b633a5e","listingId":"9b299e4b-3c77-430c-a89b-7e383b8ddfc2","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/wire/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:21.063Z"}],"sources":[{"listingId":"9b299e4b-3c77-430c-a89b-7e383b8ddfc2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:21.063Z","lastSeenAt":"2026-04-22T17:02:25.264Z"}],"details":{"listingId":"9b299e4b-3c77-430c-a89b-7e383b8ddfc2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/94 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{},"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/wire/94"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/94"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows on the Base network"],"bestFor":["Developers or agents wanting keyless pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume callers who prefer no subscriptions or commitments"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.61Z"},"updatedAt":"2026-04-22T17:02:25.264Z"}}