{"id":"e28e22de-40c5-4304-be92-919e682685f6","shortId":"s7WEuX","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/transfers/73` is one of many endpoints offered by this provider, which hosts a broad suite of APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made in USDC (contract 0x8335…2913 on Base) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). There are no API keys required, no rate limits advertised, and access is instant once payment is included in the X-PAYMENT header. The timeout window is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. The specific functionality of `/api/v1/transfers/73` is not documented beyond the generic \"Premium API Access\" label. The provider's landing page lists many other endpoints (analytics, AI, finance, utils) but does not clarify what the transfers endpoint returns or expects as input.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","transfers API","crypto payment API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","The specific functionality of /api/v1/transfers/73 is undocumented; 'Premium API Access' is generic","No input or output schema provided beyond the x402 challenge metadata","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint does, no input/output schema, no examples, and the docs pages are empty. The purpose of '/api/v1/transfers/73' is entirely 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'/request':13,28 '0.02':12,27,78,120 '000':116 '0x8335':106 '20':115 '2913':107 '300':154 '6':124 'Base network API' 'USDC micropayment endpoint' 'accept':97 'access':7,22,38,137,191 'advertis':135 'ai':203 'ai/ml':67 'amount':113 'analyt':66,202 'api':6,21,37,63,129,164,190 'base':9,24,86,109,117 'beyond':186 'broad':60 'call':4,19 'challeng':90 'clarifi':209 'confirm':91 'connect':170 'contract':105 'crypto payment API' 'data':65,71 'decim':125 'detail':177 'doc':161 'document':156,185 'endpoint':32,52,93,201,213 'expect':216 'extrem':158 'financ':69,204 'function':180 'generic':188 'given':121 'header':149 'host':58 'i.e':119 'includ':143 'infer':68 'infrastructur':73 'input':218 'instant':139 'key':130 'label':192 'land':196 'limit':134 'list':198 'live':95 'lowpaymentfee' 'lowpaymentfee.com':34 'made':102 'mani':51,199 'max':112 'network':87 'no-api-key' 'offer':53 'one':49 'page':165,197 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,100,141,148 'per':3,18,79 'post':98 'post-method' 'premium':5,20,36,189 'price':76,162 'prompt':172 'protocol':43 'provid':35,56,194 'rate':133 'render':167 'request':80,99 'requir':131 'return':214 'second':155 'settl':81 'span':64 'spars':159 'specif':45,179 'suit':61 'technic':176 'timeout':151 'transfer':212 'transfers API' 'unit':118 'usdc':15,30,83,104,122 'usdc-base-network' 'util':74,205 'via':10,25,39 'wallet':171 'web3':70 'window':152 'x':147 'x-payment':146 'x402':11,26,41,89 'x402 API' 'x402-payment'","prices":[{"id":"a93c79df-cca2-441d-aa05-642e81114510","listingId":"e28e22de-40c5-4304-be92-919e682685f6","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:55.491Z"}],"sources":[{"listingId":"e28e22de-40c5-4304-be92-919e682685f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:55.491Z","lastSeenAt":"2026-04-23T19:01:53.296Z"}],"details":{"listingId":"e28e22de-40c5-4304-be92-919e682685f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/73 \\\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 402 with x402 challenge accepting USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/73"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/73"}],"useCases":["Programmatic access to premium data or services without subscription or API key management","Agent-driven workflows that need instant, keyless API access settled on-chain","Integrating pay-per-use endpoints into Web3 applications on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already operating on the Base L2 network with USDC"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.632Z"},"updatedAt":"2026-04-23T19:01:53.296Z"}}