{"id":"cc39e1e3-a786-493c-b14a-603a314f2193","shortId":"t5Svrm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/wire/64` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe platform's landing page lists 16 endpoints across four categories (analytics/metrics, AI sentiment/summarization/classification/embeddings, finance price feeds/exchange rates/crypto quotes/gas estimates, and geocoding/validation/conversion/generation), all at the same $0.02 price point. However, documentation pages beyond the landing page returned only a \"Connect wallet\" stub, so detailed request/response schemas, parameter descriptions, and example payloads are not available. The exact functionality behind `/api/v1/wire/64` is unclear — it may be a generic wire or proxy endpoint rather than one of the named services.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["ai","finance","data","infrastructure"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","serverless API","no-auth API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no usable content.","The exact functionality of /api/v1/wire/64 ('Premium API Access') is not described anywhere — it does not match any of the 16 named endpoints on the landing page.","No request or response schemas are available; callers cannot determine what parameters to send or what data to expect.","No rate limit, SLA, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a 'Connect wallet' stub. The specific purpose of /api/v1/wire/64 is undocumented. Effectively a stub 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'/request':19,38 '0.02':18,37,70,133,185 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x8335':127 '16':165 '20':121 '2913':128 '300':156 '6':137 'Base network API' 'USDC micropayment API' 'accept':141 'access':112 'across':167 'address':152 'advertis':116 'ai':12,31,57,171 'ai-inference' 'amount':119 'analyt':56 'analytics/metrics':170 'api':5,24,45,83,111 'application/json':146 'attach':94 'avail':212 'base':8,27,78,123,130 'behind':216 'beyond':191 'broad':50 'call':4,23 'caller':92 'categori':169 'challeng':115 'collect':51 'commit':91 'connect':198 'cover':10,29 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':138 'descript':206 'detail':202 'document':189 'embeddings' 'enabl':44 'endpoint':16,35,53,66,104,140,166,228 'equal':132 'estim':178 'everi':65 'exact':214 'exampl':208 'feeds/exchange':175 'financ':13,32,60,173 'finance-data' 'four':168 'function':215 'generic':224 'geocoding' 'geocoding/validation/conversion/generation':180 'given':134 'header':98 'howev':188 'http':142 'infrastructur':63 'key':84 'land':162,193 'learn':59 'limit':87 'list':108,164 'low fee API' 'lowpaymentfee.com':39 'machin':58 'maximum':118 'may':221 'minimum':90 'name':234 'network':79 'no-auth API' 'offer':48 'one':231 'page':163,190,194 'paramet':205 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payload':209 'payment':97,148 'per':3,22,71 'per-request-pricing' 'platform':6,25,46,160 'point':187 'post':143 'premium':110 'price':68,174,186 'proxi':227 'quotes/gas':177 'rate':86 'rates/crypto':176 'rather':229 'request':72,101 'request/response':203 'return':145,195 'schema':204 'second':157 'sent':150 'sentiment-analysis' 'sentiment/summarization/classification/embeddings':172 'serverless API' 'servic':235 'settl':73 'simpli':93 'span':54 'specif':103 'stub':200 'text-classification' 'text-summarization' 'timeout':158 'unclear':219 'unit':124 'usdc':9,28,75,126,135 'usdc-base' 'util':15,34,64 'utility-services' 'wallet':199 'web3':61 'wire':225 'x402':43,96,114 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fd5b8b57-d8af-4737-88d4-f74dc3fefe8c","listingId":"cc39e1e3-a786-493c-b14a-603a314f2193","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:13.719Z"}],"sources":[{"listingId":"cc39e1e3-a786-493c-b14a-603a314f2193","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:13.719Z","lastSeenAt":"2026-04-22T05:31:51.090Z"}],"details":{"listingId":"cc39e1e3-a786-493c-b14a-603a314f2193","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/64 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wire/64"},{"claim":"Platform offers 16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with automatic per-call USDC payment","On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a lightweight utility call"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping integrations who want zero-commitment, pay-as-you-go pricing","Web3 applications already operating on the Base network with USDC liquidity"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discount documented)","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Callers without USDC on Base or without x402 payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.895Z"},"updatedAt":"2026-04-22T05:31:51.090Z"}}