{"id":"ff88bf5a-70bb-4b9a-b9a9-296abd9960ac","shortId":"qeMrsx","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers 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, paid in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/wire/134` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the `/api/v1/wire/134` \"Premium API Access\" endpoint is unclear; it may be a generic wire or proxy endpoint rather than one of the named category endpoints. Prospective users should be aware that without documentation, the request format and response structure must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api marketplace","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only a wallet-connect prompt","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/wire/134 ('Premium API Access') has no description of what it actually does or what request body it expects","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/134","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/134","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 OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the actual purpose of /api/v1/wire/134 is undocumented. The listing is effectively a stub with pricing 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'/api/v1/wire/134':120,221 '/docs':184 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,95,148 '000':137 '0x8335':142 '20':136 '2913':143 '300':164 '402 payment api' '6':152 'accept':169 'access':126,224 'across':54 'actual':217 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,107,125,223 'application/json':174 'avail':215 'awar':249 'base':8,27,103,138,145 'base network api' 'behind':219 'beyond':176 'broad':50 'call':4,23 'categori':56,243 'challeng':132 'classif':71 'classification' 'commit':115 'connect':194 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':153 'detail':201 'discov':261 'document':175,210,252 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,118,168,225,236,244 'equal':147 'estim':82 'exact':160 'exampl':214 'exchang':77 'experiment':262 'export':62 'extrem':181 'feed':76 'financ':13,32,73 'finance-data' 'format':255 'four':55 'function':218 'gas':81 'generat':89 'generic':232 'geocod':86 'geocoding' 'given':149 'http':170 'infrastructur':84 'insight':63 'key':108 'land':178 'learn':66 'limit':111 'list':122 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':156 'marketplac':46 'may':229 'metric':59 'micropayment api' 'minimum':114 'must':259 'name':242 'network':104 'offer':48 'one':239 'openapi':205 'page':179,189 'paid':98 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':154 'per':3,22,96 'platform':6,25 'post':171 'premium':124,222 'price':75,93 'prompt':196 'prospect':245 'proxi':235 'quot':80 'rate':78,110 'rather':237 'render':191 'report':60 'request':97,133,254 'request/response':208 'respons':257 'return':128,173 'schema':209 'scheme':161 'second':165 'sentiment':67 'sentiment-analysis' 'set':51 'spars':182 'spec':206 'specif':117 'structur':258 'summar':70 'technic':200 'text':69 'text-summarization' 'timeout':166 'token':79 'unclear':227 'unit':139 'usag':213 'usdc':100,141,150 'usdc api' 'usdc-base' 'user':246 'util':15,34,85 'utility-apis' 'valid':87,130 'via':9,28,157 'wallet':195 'web3':74 'wire':233 'without':251 'x402':10,29,43,131,159 'x402 api marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7d9fff20-47d3-459b-9220-af7c6778ef12","listingId":"ff88bf5a-70bb-4b9a-b9a9-296abd9960ac","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:50.174Z"}],"sources":[{"listingId":"ff88bf5a-70bb-4b9a-b9a9-296abd9960ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:50.174Z","lastSeenAt":"2026-04-22T07:01:44.127Z"}],"details":{"listingId":"ff88bf5a-70bb-4b9a-b9a9-296abd9960ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/134 \\\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/134"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with micro-payments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents and developers who want zero-signup, pay-per-use API access","Use cases requiring low-cost micro-transactions for diverse API calls","Crypto-native workflows already operating on the Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","High-volume production workloads that would benefit from bulk pricing or rate-limit guarantees","Users without USDC on the Base network or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.091Z"},"updatedAt":"2026-04-22T07:01:44.127Z"}}