{"id":"135a101e-d836-40fa-a838-5887c85b7a5b","shortId":"cmJgPt","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/164` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header with each request.\n\nThe broader platform advertises multiple API categories including 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. Payments settle in USDC on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nNote that the specific functionality behind the `/api/v1/transfers/164` endpoint is unclear — the description simply says \"Premium API Access\" with no further documentation on what data or service it returns. The docs, pricing, and README pages on the site all render only a \"Connect wallet\" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/transfers/164 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README) render only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The broader platform lists many API categories (AI, finance, analytics, etc.) but none have documented schemas or example responses."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/164","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality of this specific endpoint is completely undocumented. The docs/pricing/README pages are all blank beyond a wallet-connect 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'/request':13,28 '0.02':12,27,65,142 '000':69 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '20':68 '402 payment endpoint' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,171 'account':80 'actual':209 'address':152 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,170 'attach':88 'base':8,23,51,70,150 'behavior':210 'behind':159 'broader':97 'call':4,19,67 'caller':86 'categori':102 'classif':118 'connect':196 'content':202 'convers':135 'cost':64 'crypto-paid API' 'data':104,108,178 'decim':76 'descript':166 'doc':184 'document':175,204 'embed':119 'endpoint':55,138,162,213 'estim':129 'exampl':206 'exchang':124 'export':109 'feed':123 'financ':120 'function':158 'gas':128 'generat':136 'geocod':133 'header':92 'includ':103 'infrastructur':131 'insight':110 'json-response' 'key':79 'learn':113 'limit':83 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'multipl':100 'network':9,24,52 'no-api-key' 'no-rate-limits' 'note':154 'page':188 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,91,145 'per':3,18,36,66,143 'platform':6,21,39,98 'premium':60,169 'price':122,140,185 'prompt':198 'protocol':44 'quot':127 'rate':82,125 'readm':187 'render':193 'report':107 'request':37,95,144 'requir':85 'respons':207 'return':182 'say':168 'sentiment':114 'servic':180 'settl':146 'simpli':87,167 'site':191 'specif':54,157 'substant':201 'summar':117 'text':116 'token':126 'unclear':164 'unit':71 'unknown':215 'usdc':15,30,47,73,148 'usdc-base-network' 'use':41 'util':132 'valid':134 'via':10,25 'wallet':197 'web3':121 'without':203 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"1e2cd4e9-1087-47b1-9bf1-0c7fc63a34c6","listingId":"135a101e-d836-40fa-a838-5887c85b7a5b","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:28.239Z"}],"sources":[{"listingId":"135a101e-d836-40fa-a838-5887c85b7a5b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:28.239Z","lastSeenAt":"2026-04-22T12:04:43.215Z"}],"details":{"listingId":"135a101e-d836-40fa-a838-5887c85b7a5b","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Probe for the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/164\n# 2. Parse the 402 JSON, construct the X-PAYMENT header per x402 spec,\n#    then re-send with payment attached:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/164 \\\n  -H \"X-PAYMENT: <signed-payment-payload>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/164"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/164"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages show only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, instant API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting no-signup, pay-as-you-go API access","x402 protocol experimentation on Base network","Low-cost per-call API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Use cases requiring known, well-documented response schemas","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.997Z"},"updatedAt":"2026-04-22T12:04:43.215Z"}}