{"id":"3f38d188-f536-4e18-81e9-ed5296206dbd","shortId":"esfyuQ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/88` is listed as \"Premium API Access\" and carries a max payment of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site-wide pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\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 is extremely thin: 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 from the crawled content. The exact functionality behind the `/api/v1/transfers/88` path is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API gateway","402 payment API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The exact functionality of /api/v1/transfers/88 ('Premium API Access') is not described anywhere in the crawled material","No request or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/88","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/transfers/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /api/v1/transfers/88 endpoint is undocumented. This is effectively a stub 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'/request':13,28 '0.02':12,27,62,113,115,174 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':141 '20':107 '402 payment API' 'Base network API' 'USDC pay-per-call' 'accept':131 'access':100 'account':74 'across':45 'address':137 'advertis':147 'ai/ml':48 'analysi':151 'analyt':47 'api':5,20,37,72,99,184 'attach':82 'avail':214,230 'base':8,23,69,109,143 'base-network' 'behind':222 'broader':145 'call':4,19 'caller':80 'carri':102 'challeng':125 'classif':154 'confirm':126 'connect':193 'consist':116 'content':218 'convers':166 'crawl':217 'crypto API gateway' 'data':46,168 'detail':200 'doc':183 'document':178,209 'embed':155 'enabl':36 'endpoint':44,55,92,128,148 'estim':163 'exact':220 'exampl':213 'exchang':158 'extrem':180 'feed':157 'finance/web3':50 'function':221 'gas':162 'generat':169 'geocod':164 'header':86 'howev':177 'infer':49 'infrastructur':52 'key':73 'limit':77 'list':96 'live':130 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':231 'max':104 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':204 'page':188 'path':225 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,105 'per':3,18,59 'platform':6,21,38,146 'point':176 'post':132 'post-endpoint' 'premium':98 'price':122,156,175,185 'prompt':195 'quot':161 'rate':76,159 'readm':187 'render':190 'request':60,89,133 'request/response':207 'requir':79 'schema':208 'sentiment':150 'settl':64,135 'simpli':81 'site':120 'site-wid':119 'spec':205 'specif':91 'summar':153 'technic':199 'text':152 'thin':181 'token':160 'unclear':227 'unit':110 'usag':212 'usdc':15,30,66,112,114,140 'usdc-settlement' 'use':139 'util':53 'valid':165 'varieti':42 'via':10,25 'wallet':194 'wide':121 'x402':11,26,35,84,124 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"265ee49f-564e-490f-ba29-b108bffc0fe0","listingId":"3f38d188-f536-4e18-81e9-ed5296206dbd","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/transfers/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:57.273Z"}],"sources":[{"listingId":"3f38d188-f536-4e18-81e9-ed5296206dbd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:57.273Z","lastSeenAt":"2026-04-22T15:02:25.719Z"}],"details":{"listingId":"3f38d188-f536-4e18-81e9-ed5296206dbd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/88 \\\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":"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":"x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/88"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/88"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without creating accounts or managing API keys","Making programmatic payments for API calls using USDC on Base","Agent-driven workflows that need instant, permissionless API access"],"bestFor":["Developers wanting zero-friction API access with crypto payments","AI agents that need to autonomously purchase API calls","Users who prefer pay-as-you-go pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or committed-use discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.599Z"},"updatedAt":"2026-04-22T15:02:25.719Z"}}