{"id":"fd0c93d0-72c4-464c-a1f9-fc3560a8f858","shortId":"evMVHz","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 hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. Each call costs $0.02 in USDC (USD Coin) with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/wire/48` is listed as \"Premium API Access\" and accepts POST requests settled in USDC on Base.\n\nThe platform advertises 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 appear to follow the same $0.02 per-request pricing model.\n\nHowever, the `/api/v1/wire/48` endpoint's x402 challenge shows a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the advertised pricing. The endpoint accepts payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schema for this specific endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/wire/48 is unknown","No OpenAPI or schema definition provided","The endpoint path 'wire/48' does not match any of the advertised API categories on the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/48","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/48","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of `/api/v1/wire/48` specifically (as opposed to the other listed endpoints) is entirely unclear. The docs, pricing, API, and README pages all render only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,55,139,165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':184 '20000':156 '6':161 'accept':83,173 'access':42,81 'actual':203 'address':176 'advertis':93,169 'ai':106 'analysi':110 'analyt':100 'api':5,20,40,62,80 'appear':134 'base':8,23,50,90,157,183 'base network api' 'base-network' 'beyond':186 'broad':95 'call':4,19,53 'categori':96 'challeng':151 'classif':113 'coin':59 'collect':34 'connect':199 'consist':166 'contract':181 'convers':130 'cost':54 'data':99,103 'decim':162 'document':185 'embed':114 'empti':192 'endpoint':41,73,98,133,148,172,209 'equal':164 'essenti':191 'estim':124 'exchang':119 'export':104 'feed':118 'financ':115 'follow':136 'four':94 'gas':123 'generat':131 'geocod':128 'host':32 'howev':145 'infrastructur':126 'insight':105 'json-response' 'key':63 'land':188 'learn':108 'limit':66 'list':77 'low payment fee' 'lowpaymentfee.com':31 'machin':107 'maxamountrequir':154 'metric':101 'micropayment api' 'model':144 'network':9,24,51 'no-api-key' 'page':189,196 'pay':2,17,37 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':36 'payment':46,174 'per':3,18,38,141 'per-request':140 'platform':6,21,92 'post':84 'post-endpoint' 'premium':79 'premium api access' 'price':117,143,170 'protocol':47 'quot':122 'rate':65,120 'report':102 'request':39,85,142 'request/response':204 'requir':70 'schema':205 'sentiment':109 'settl':86 'show':152,198 'specif':72,208 'sub':195 'sub-pag':194 'subscript':69 'summar':112 'text':111 'token':121 'unit':158 'unknown':211 'usd':58 'usdc':15,30,57,88,160,180 'usdc api' 'usdc-settlement' 'use':178 'util':127 'valid':129 'via':10,25,43 'wallet':200 'web3':116 'x402':11,26,45,150 'x402 api' 'x402-payment'","prices":[{"id":"652e2b06-c7b0-45a2-a3cc-aea1433b801c","listingId":"fd0c93d0-72c4-464c-a1f9-fc3560a8f858","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:16.752Z"}],"sources":[{"listingId":"fd0c93d0-72c4-464c-a1f9-fc3560a8f858","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:16.752Z","lastSeenAt":"2026-04-22T11:32:33.863Z"}],"details":{"listingId":"fd0c93d0-72c4-464c-a1f9-fc3560a8f858","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/48"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/48"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402-compatible agents with a low-cost utility API","Accessing data, AI, finance, or infrastructure endpoints with USDC micropayments"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-native workflows on the Base network","Low-cost micropayment API experimentation"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-throughput production workloads where per-request pricing may add up","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.781Z"},"updatedAt":"2026-04-22T11:32:33.863Z"}}