{"id":"7742b3bb-7692-4a95-a67e-d74f8b2dcd9c","shortId":"8MXUUa","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 marketplace that exposes a broad set of 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 priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/wire/198` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is made via the `exact` scheme to the specified payTo address. The endpoint accepts HTTP POST and returns `application/json`.\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 available from the crawled material. The purpose of the `/api/v1/wire/198` endpoint specifically is unclear; it may be a generic premium access route or a specific resource. Without documentation, callers will need to experiment to discover the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee API","x402 API marketplace","pay-per-call API","USDC API","Base network API","micropayment API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","The specific purpose of /api/v1/wire/198 ('Premium API Access') is not explained anywhere in the crawled material","No examples, error codes, or rate limit information documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/198","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/198","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 well-formed, confirming the endpoint works and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/wire/198 is undocumented. This is effectively a stub 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'/api/v1/wire/198':123,218 '/docs':179 '/pricing':180 '/readme':183 '/request':19,38 '0.02':18,37,95,153 '000':141 '0x8335':146 '20':140 '402 payment API' '6':149 'Base network API' 'USDC API' 'accept':168 'access':129,229 'across':54 'address':165 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,128 'application/json':173 'avail':209 'base':8,27,103,142,148 'bodi':247 'broad':50 'call':4,23 'caller':237 'categori':56 'challeng':135 'classif':71 'classification' 'commit':118 'connect':189 'content':195 'convers':88 'conversion' 'cover':10,29 'crawl':212 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':150 'discov':243 'document':174,204,236 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,167,219 'equal':152 'estim':82 'exact':159 'exampl':208 'exchang':77 'expect':245 'experi':241 'export':62 'expos':48 'extrem':176 'feed':76 'financ':13,32,73 'finance-data' 'format':250 'four':55 'gas':81 'gas-estimates' 'generat':89 'generic':227 'geocod':86 'geocoding' 'http':169 'infrastructur':84 'insight':63 'key':111 'learn':66 'limit':114 'list':125 'low payment fee API' 'lowpaymentfee.com':39 'machin':65 'made':156 'marketplac':46 'materi':213 'maxamountrequir':138 'may':224 'metric':59 'micropayment API' 'need':239 'network':104 'openapi':199 'page':184 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payabl':98 'payment':154 'payto':164 'per':3,22,96 'platform':6,25 'post':170 'premium':127,228 'price':75,93 'prompt':191 'protocol':108 'purpos':215 'quot':80 'rate':78,113 'render':186 'report':60 'request':97,246 'request/response':202 'resourc':234 'respons':249 'return':131,172 'rout':230 'schema':203 'scheme':160 'sentiment':67 'sentiment-analysis' 'set':51 'spars':177 'spec':200 'specif':120,220,233 'specifi':163 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':222 'unit':143 'upfront':117 'usag':207 'usdc':9,28,100,145 'usdc-base' 'util':15,34,85 'valid':87,133 'validation' 'via':105,157 'wallet':190 'web3':74 'without':235 'x402':43,107,134 'x402 API marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d3cab50a-041b-4209-bd99-355b0409aa5d","listingId":"7742b3bb-7692-4a95-a67e-d74f8b2dcd9c","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:56.176Z"}],"sources":[{"listingId":"7742b3bb-7692-4a95-a67e-d74f8b2dcd9c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:56.176Z","lastSeenAt":"2026-04-22T07:01:44.362Z"}],"details":{"listingId":"7742b3bb-7692-4a95-a67e-d74f8b2dcd9c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/198 \\\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 are 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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/198"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Running geocoding, validation, or data conversion tasks with no subscription commitment","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible agents that can settle USDC on Base automatically"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or dedicated support","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.762Z"},"updatedAt":"2026-04-22T07:01:44.362Z"}}