{"id":"c3a1fe93-b9e3-4dd4-bc71-95474b13d2bc","shortId":"dtMCLW","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 variety 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, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/wire/172` 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 by including an X-PAYMENT header. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation beyond the landing page is 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 example payloads available. The actual functionality behind the `/api/v1/wire/172` path is unclear; it does not map to any of the named endpoints listed on the homepage. Agents should be aware that without documented input/output schemas, integration requires experimentation or additional out-of-band information.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","crypto api marketplace","402 payment api"],"warnings":["No OpenAPI or schema documentation available — input/output formats are unknown","The /docs, /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')","The endpoint path /api/v1/wire/172 does not correspond to any named endpoint on the homepage; its actual functionality is unclear","No rate limit or uptime information documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/172","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/172","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 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The specific wire/172 path is not explained anywhere on the site. Effectively a stub 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'/api/v1/wire/172':117,221 '/docs':184 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,94,145 '000':134 '0x8335':139 '20':133 '2913':140 '402 payment api' '6':149 'accept':168 'access':123 'across':53 'actual':217 'addit':252 'agent':239 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':57 'api':5,24,45,106,122 'application/json':174 'avail':215 'awar':242 'band':256 'base':8,27,102,135,142 'base network api' 'behind':219 'beyond':177 'call':4,23 'categori':55 'challeng':129 'classif':70 'classification' 'commit':111 'connect':194 'convers':87 'crypto api marketplace' 'data':11,30,56,60 'data-analytics' 'decim':150 'detail':201 'document':176,210,245 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,52,90,115,167,234 'equal':144 'estim':81 'exact':157 'exampl':213 'exchang':76 'experiment':250 'export':61 'feed':75 'financ':13,32,72 'finance-data' 'four':54 'function':218 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':146 'header':165 'homepag':238 'http':169 'includ':160 'inform':257 'infrastructur':83 'input/output':246 'insight':62 'integr':248 'key':107 'land':179 'learn':65 'limit':109 'list':119,235 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':153 'map':228 'marketplac':46 'metric':58 'micropayment api' 'name':233 'network':103 'offer':48 'openapi':205 'out-of-band':253 'page':180,189 'paid':97 'path':222 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':214 'payment':151,164 'per':3,22,95 'platform':6,25 'post':170 'premium':121 'price':74,92 'prompt':196 'quot':79 'rate':77,108 'render':191 'report':59 'request':96,130,171 'request/response':208 'requir':112,249 'respons':175 'return':125,173 'schema':209,247 'scheme':158 'sentiment':66 'sentiment-analysis' 'spars':182 'spec':206 'specif':114 'summar':69 'technic':200 'text':68 'text-summarization' 'token':78 'unclear':224 'unit':136 'usdc':99,138,147 'usdc api' 'usdc-base' 'util':15,34,84 'utility-apis' 'valid':86,127 'varieti':50 'via':9,28,154 'wallet':195 'web3':73 'without':244 'x':163 'x-payment':162 'x402':10,29,43,128,156 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"640ed104-435d-450b-a5b1-a9ca656cb876","listingId":"c3a1fe93-b9e3-4dd4-bc71-95474b13d2bc","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:46.558Z"}],"sources":[{"listingId":"c3a1fe93-b9e3-4dd4-bc71-95474b13d2bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:46.558Z","lastSeenAt":"2026-04-22T13:31:59.539Z"}],"details":{"listingId":"c3a1fe93-b9e3-4dd4-bc71-95474b13d2bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/172 \\\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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/wire/172"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment","Running utility operations like geocoding or data validation on a per-call billing basis","Programmatic data export and analytics without subscription commitments"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-commitment, no-signup API access","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-call pricing becomes expensive compared to subscription APIs","Use cases requiring detailed SLAs, uptime guarantees, or documented error handling","Applications that need well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.232Z"},"updatedAt":"2026-04-22T13:31:59.539Z"}}