{"id":"17562dca-f059-43f8-8063-03bd59e32f34","shortId":"hNchsL","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wire/81` is listed as \"Premium API Access\" and returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The caller simply includes an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/wire/81` path specifically is unclear — it does not match any of the named endpoints listed on the homepage. Without documentation it is impossible to determine what input this endpoint expects or what output it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto API gateway"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or JSON schema provided for request or response","The path /api/v1/wire/81 does not match any of the named endpoints listed on the homepage; its actual function is unknown","No usage examples or error handling documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02/call. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific /api/v1/wire/81 path does not correspond to any named endpoint on the homepage. Effectively a stub 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'/api/v1/wire/81':104,204 '/docs':170 '/pricing':171 '/readme':174 '/request':17,34 '0.02':16,33,91,133 '000':122 '0x8335':127 '20':121 '2913':128 'Base network API' 'USDC API' 'access':110 'across':48 'ai':10,27,57 'ai-inference' 'analysi':61 'analyt':52 'api':4,21,40,109,143 'base':7,24,99,123,130 'base-network' 'call':89 'caller':152 'categori':50 'challeng':116 'classif':64 'classification' 'connect':180 'content':186 'convers':81 'crypto API gateway' 'data':9,26,51 'data-analytics' 'determin':228 'document':165,195,223 'embed':65 'embeddings' 'endpoint':14,31,47,84,103,217,232 'equal':132 'estim':75 'exact':140 'exampl':199 'exchang':70 'expect':233 'export':55 'expos':43 'extrem':167 'feed':69 'financ':11,28,66 'finance-data' 'four':49 'gas':74 'gate':3,20 'generat':82 'geocod':79 'geocoding' 'header':159 'homepag':221 'imposs':226 'includ':154 'infrastructur':77 'input':230 'insight':56 'key':144 'learn':59 'limit':148 'list':106,218 'low payment fee' 'lowpaymentfee.com':35 'machin':58 'made':136 'marketplac':41 'match':212 'maxamountrequir':119 'metric':53 'micropayment API' 'name':216 'network':100 'offer':8,25 'openapi':190 'output':236 'page':175 'path':205 'pay':87 'pay-per-cal':86 'pay-per-call API' 'pay-per-request' 'payment':134,158,163 'per':88,92 'platform':5,22 'premium':108 'price':68 'prompt':182 'proof':164 'protocol':39 'purpos':201 'quot':73 'rate':71,147 'render':177 'report':54 'request':93 'request/response':193 'requir':150 'return':112,238 'schema':194 'scheme':141 'sentiment':60 'sentiment-analysis' 'settl':94 'simpli':153 'spars':168 'spec':191 'specif':102,206 'subscript':145 'summar':63 'text':62 'text-summarization' 'token':72 'unclear':208 'unit':124 'usag':198 'usdc':96,126 'usdc-settlement' 'util':13,30,78 'utility-apis' 'valid':80,114,162 'varieti':45 'via':137 'wallet':181 'web3':67 'without':222 'x':157 'x-payment':156 'x402':2,19,38,115,139 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"a512299e-70e4-45b9-9e69-0094bd0d3ba2","listingId":"17562dca-f059-43f8-8063-03bd59e32f34","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:09.504Z"}],"sources":[{"listingId":"17562dca-f059-43f8-8063-03bd59e32f34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:09.504Z","lastSeenAt":"2026-04-22T07:01:44.877Z"}],"details":{"listingId":"17562dca-f059-43f8-8063-03bd59e32f34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/81 \\\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":"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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/81"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"/docs, /pricing, /api, and /README pages show only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant crypto-settled payments","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Crypto-native workflows that can settle in USDC on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring bulk pricing or rate-limit guarantees","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.098Z"},"updatedAt":"2026-04-22T07:01:44.877Z"}}