{"id":"1a54e53a-abfd-4d90-b314-bece02087159","shortId":"ANsRUG","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, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/179` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. The endpoint accepts POST requests and returns application/json responses. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 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 from the crawled content. The exact functionality of the `/api/v1/transfers/179` endpoint specifically is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The exact functionality of /api/v1/transfers/179 ('Premium API Access') is not described anywhere in the crawled material","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/179","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /transfers/179 endpoint is undocumented. Effectively a stub 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'/request':13,28 '0.02':12,27,62,124,177 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '20':108 '300':144 '6':120 'Base network API' 'USDC micropayment API' 'accept':129 'access':101 'across':45 'address':140 'advertis':103,150 'ai/ml':48 'amount':106 'analysi':154 'analyt':47 'api':5,20,37,72,100,187 'application/json':134 'attach':83 'avail':217,234 'base':8,23,69,110,116 'base-network' 'broader':148 'call':4,19,126 'caller':81 'classif':157 'commit':78 'connect':196 'content':221 'convers':169 'crawl':220 'crypto-paid API' 'data':46,171 'decim':121 'detail':203 'doc':186 'document':181,212 'embed':158 'enabl':36 'endpoint':44,55,93,128,151,228 'equal':123 'estim':166 'exact':223 'exampl':216 'exchang':161 'extrem':183 'feed':160 'finance/web3':50 'function':224 'gas':165 'generat':172 'geocod':167 'header':87 'howev':180 'infer':49 'infrastructur':52 'json-response' 'key':73 'limit':75 'list':97 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':235 'max':105 'network':9,24,70 'no-api-key' 'offer':40 'openapi':207 'page':191 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':86,136 'per':3,18,59,125 'platform':6,21,38,149 'point':179 'post':130 'post-method' 'premium':99 'premium API access' 'price':159,178,188 'prompt':198 'quot':164 'rate':74,162 'readm':190 'render':193 'request':60,90,131 'request/response':210 'requir':80 'respons':135 'return':133 'schema':211 'second':145 'sent':138 'sentiment':153 'settl':64 'simpli':82 'sinc':117 'spars':184 'spec':208 'specif':92,229 'summar':156 'technic':202 'text':155 'timeout':146 'token':163 'unclear':231 'unit':111 'upfront':77 'usag':215 'usdc':15,30,66,113,118 'usdc-settlement' 'use':119 'util':53 'valid':168 'varieti':42 'via':10,25 'wallet':197 'x402':11,26,35,85 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"46214357-62e2-408d-be80-567b2b5835d9","listingId":"1a54e53a-abfd-4d90-b314-bece02087159","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:35.620Z"}],"sources":[{"listingId":"1a54e53a-abfd-4d90-b314-bece02087159","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:35.620Z","lastSeenAt":"2026-04-23T02:01:53.105Z"}],"details":{"listingId":"1a54e53a-abfd-4d90-b314-bece02087159","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/179 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (equals $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/179"},{"claim":"Payment settled to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/179"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/179"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without registration or API keys","Making micropayment-gated API calls settled in USDC on Base","Agent-driven workflows that need on-demand paid data or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API consumption"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.572Z"},"updatedAt":"2026-04-23T02:01:53.105Z"}}