{"id":"b9ec6ed2-df6c-4677-99bf-490c97ef1505","shortId":"FsNWWa","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/91` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request. However, the specific functionality behind `/api/v1/wire/91` is not documented beyond the label \"Premium API Access,\" so its exact behavior and response format are unclear.\n\nPayments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`. Documentation pages (docs, pricing, README) all rendered only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/wire/91 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The broader site lists many API categories but it is unclear which, if any, map to this specific wire/91 endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what /api/v1/wire/91 actually does, no request/response schema, and all doc pages render only 'Connect wallet'. The specific functionality behind 'Premium API Access' is entirely 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'/request':13,28 '0.02':12,27,80,157 '000':74 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':193 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':199 '20':73 '402':68 '6':84 'Base network API' 'USDC micropayment API' 'accept':46,202 'access':62,174 'addit':222 'address':192 'advertis':113 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,89,115,173 'application/json':207 'attach':98 'base':8,23,51,75,188 'behavior':178 'behind':164 'beyond':169 'broader':111 'call':4,19,87 'caller':96 'categori':116 'challeng':69 'classif':132 'connect':217 'contract':197 'convers':149 'crypto-paid API' 'data':118,122 'decim':85 'detail':224 'doc':210 'document':168,208 'embed':133 'endpoint':55,152,201 'estim':143 'exact':177 'exchang':138 'export':123 'feed':137 'financ':134 'format':181 'function':163 'gas':142 'generat':150 'geocod':147 'given':81 'header':103 'howev':160 'i.e':79 'includ':117 'infrastructur':145 'insight':124 'json-response' 'key':90 'l2':189 'label':171 'learn':127 'limit':93 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':126 'metric':120 'multipl':114 'network':9,24,52,190 'no-api-key' 'page':209 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,102,108,184 'per':3,18,36,86,158 'platform':6,21,39,112 'post':203 'post-method' 'premium':60,172 'premium API access' 'price':136,155,211 'prompt':219 'proof':109 'protocol':44 'quot':141 'rate':92,139 'readm':212 'render':214 'report':121 'request':37,70,159,204 'requir':95 'respons':180 'return':64,206 'sentiment':128 'settl':185 'simpli':97 'specif':54,162 'standard':66 'summar':131 'technic':223 'text':130 'token':140 'unclear':183 'uniform':154 'unit':76 'usdc':15,30,47,78,82,196 'usdc-base' 'use':41,194 'util':146 'valid':106,148 'via':10,25 'wallet':218 'web3':135 'x':101 'x-payment':100 'x402':11,26,43,67,107 'x402 API' 'x402-payment'","prices":[{"id":"98b14bcd-bcce-49cb-b1e1-9c7c36e07499","listingId":"b9ec6ed2-df6c-4677-99bf-490c97ef1505","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:18.602Z"}],"sources":[{"listingId":"b9ec6ed2-df6c-4677-99bf-490c97ef1505","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:18.602Z","lastSeenAt":"2026-04-22T16:32:23.782Z"}],"details":{"listingId":"b9ec6ed2-df6c-4677-99bf-490c97ef1505","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/91 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/91"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/91"},{"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":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API 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, pay-as-you-go API access on Base","Integrating x402-compatible payment flows into automated pipelines"],"bestFor":["Developers or agents already holding USDC on Base who want frictionless API access","x402-native agent toolchains that auto-negotiate payment challenges","Low-volume, on-demand API consumption without subscription commitments"],"notFor":["Users who need detailed documentation or well-defined response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.672Z"},"updatedAt":"2026-04-22T16:32:23.782Z"}}