{"id":"10d21a99-721e-47d0-8e79-61af04b1f23b","shortId":"Lt7Xdf","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, settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint at `/api/v1/wire/31` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated entirely by per-request micropayment.\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/31` endpoint specifically is unclear; it may be a generic premium access route or a specific wire-transfer-related endpoint. Without documentation, callers will need to experiment with POST payloads to discover the expected input format and response structure.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["micropayment API","x402 API","pay-per-call","USDC API","Base network API","low fee API","crypto payment API","on-demand API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/wire/31 ('Premium API Access') is undocumented and unclear","Cannot verify what data or functionality any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/31","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/31","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 pricing and payment details. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/wire/31 is undocumented. This is effectively a stub 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'/api/v1/wire/31':114,219 '/docs':180 '/pricing':181 '/readme':184 '/request':19,38 '0.02':18,37,95,142 '000':131 '0x8335':136 '20':130 '2913':137 '300':155 '402':125 '6':140 'Base network API' 'USDC API' 'access':120,166,230 'across':54 'advertis':165 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,119,159 'avail':210 'base':8,27,103,132,139 'broad':50 'call':4,23,144 'caller':242 'categori':56 'challeng':126 'classif':71 'connect':190 'content':196 'convers':88 'conversion' 'cover':10,29 'crawl':213 'crypto payment API' 'data':11,30,57,61 'data-analytics' 'decim':141 'discov':251 'document':175,205,241 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,112,220,239 'entir':169 'estim':82 'exact':151 'exampl':209 'exchang':77 'exchange-rates' 'expect':253 'experi':246 'export':62 'expos':48 'extrem':177 'feed':76 'financ':13,32,73 'format':255 'four':55 'gas':81 'gas-estimates' 'gate':168 'generat':89 'generic':228 'geocod':86 'geocoding' 'infrastructur':84 'input':254 'insight':63 'key':160 'learn':66 'limit':163 'list':116 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':147 'marketplac':46 'materi':214 'may':225 'metric':59 'micropay':174 'micropayment API' 'need':244 'network':104 'on-demand API' 'openapi':200 'page':185 'pay':2,21 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request' 'payload':249 'payment':108,145 'per':3,22,96,143,172 'per-request':171 'platform':6,25 'post':248 'premium':118,229 'price':75,93 'price-feeds' 'prompt':192 'protocol':109 'purpos':216 'quot':80 'rate':78,162 'relat':238 'render':187 'report':60 'request':97,127,173 'request/response':203 'respons':257 'return':122 'rout':231 'schema':204 'scheme':152 'second':156 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'spars':178 'spec':201 'specif':111,221,234 'structur':258 'summar':70 'text':69 'text-classification' 'text-summarization' 'timeout':157 'token':79 'transfer':237 'unclear':223 'unit':133 'usag':208 'usdc':9,28,100,135 'usdc-base' 'util':15,34,85 'valid':87,124 'validation' 'via':105,148 'wallet':191 'web3':74 'wire':236 'wire-transfer-rel':235 'without':240 'x402':43,107,150 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9433fb17-92bd-46fe-8765-2c34479dfe64","listingId":"10d21a99-721e-47d0-8e79-61af04b1f23b","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:58.608Z"}],"sources":[{"listingId":"10d21a99-721e-47d0-8e79-61af04b1f23b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:58.608Z","lastSeenAt":"2026-04-22T07:01:44.450Z"}],"details":{"listingId":"10d21a99-721e-47d0-8e79-61af04b1f23b","quickStartSnippet":"# Pay $0.02 in USDC on Base per request via x402\ncurl -X POST https://lowpaymentfee.com/api/v1/wire/31 \\\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":"The x402 challenge for /api/v1/wire/31 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wire/31"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment","Running data analytics queries and exporting data on a per-request payment basis","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly without bulk discounts","Developers who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.637Z"},"updatedAt":"2026-04-22T07:01:44.450Z"}}