{"id":"51686e4f-0b5c-4b2b-8243-a0e7fe8b11d2","shortId":"KxjcfV","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/wire/153` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and charges up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The payment scheme is \"exact\" with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The exact functionality of /api/v1/wire/153 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no technical content.","No request body schema or response schema is available for this endpoint.","The platform lists many endpoint categories but none have detailed documentation visible without wallet connection."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/153","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/153","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, confirming pricing and network. However, the specific functionality of /api/v1/wire/153 is undocumented, no request/response schemas are available, and all documentation pages return only a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':12,30 '0.02':11,29,65,139,186 '000':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':145 '20':133 '300':153 '402 payment required' 'accept':126 'access':108 'across':51 'advertis':159 'ai/ml':54 'analysi':163 'analyt':53 'api':5,16,23,34,43,79,107 'asset':143 'attach':90 'base':8,26,73,135,142 'base network api' 'beyond':116 'broader':157 'call':4,22 'caller':88 'challeng':121 'charg':130 'classif':166 'commit':87 'confirm':122 'connect':198 'contract':144 'convers':178 'data':52,180 'detail':205 'doc':192 'document':115,190 'embed':167 'enabl':42 'endpoint':50,61,100,160,211 'estim':175 'exact':111,150 'exchang':170 'feed':169 'finance/web3':56 'function':112 'gas':174 'generat':181 'geocod':176 'header':94 'howev':189 'individu':210 'infer':55 'json-response' 'key':17,35,80 'label':118 'limit':83 'list':104 'live':125 'low payment fee' 'lowpaymentfee.com':37 'marketplac':44 'micropayment api' 'network':74 'no-api-key' 'offer':46 'page':191 'paid':68 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':93,147 'per':3,21,66 'platform':6,24,76,158 'point':188 'post':127 'post-method' 'premium':106 'price':63,168,187,193 'prompt':200 'quot':173 'rate':82,171 'readm':194 'request':67,97,128 'request/response':207 'requir':18,36,77 'return':195 'schema':208 'scheme':148 'second':154 'sentiment':162 'servic':59 'simpli':89 'specif':99 'summar':165 'technic':204 'text':164 'timeout':155 'token':172 'unit':136 'unknown':213 'upfront':86 'usd':140 'usdc':14,32,70,138 'usdc api' 'usdc-base' 'util':58 'valid':177 'varieti':48 'via':9,27 'wallet':199 'x402':10,28,41,92,120 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9789bbb5-3c2a-41ae-9d09-2903ba63bd71","listingId":"51686e4f-0b5c-4b2b-8243-a0e7fe8b11d2","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:45.374Z"}],"sources":[{"listingId":"51686e4f-0b5c-4b2b-8243-a0e7fe8b11d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:45.374Z","lastSeenAt":"2026-04-22T15:02:29.104Z"}],"details":{"listingId":"51686e4f-0b5c-4b2b-8243-a0e7fe8b11d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/153 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/wire/153"},{"claim":"Price is $0.02 per request, paid in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/153"},{"claim":"maxAmountRequired is 20000 base units (0.02 USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/wire/153"}],"useCases":["Programmatic access to utility or data APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integration with a low-cost test endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Users who want sub-dollar micropayment API calls on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.232Z"},"updatedAt":"2026-04-22T15:02:29.104Z"}}