{"id":"9a0aeabe-a088-4b9a-8e1a-e7f2f41e2e7c","shortId":"3Hu25d","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/transfers/180` is one of many API endpoints offered by this provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe provider advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access. Payment is settled in USDC on the Base network. The x402 challenge confirms the endpoint is live, accepting POST requests with a maximum amount of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals). The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC contract on Base is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\n\nHowever, the specific functionality of the `/api/v1/transfers/180` endpoint is unclear. The provider's landing page lists various API categories but does not explicitly list a \"transfers\" endpoint. No OpenAPI schema, detailed documentation, or example responses are available — the docs, pricing, and README pages all render only a \"Connect wallet\" prompt. The actual behavior and response format of this particular endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","transfers API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transfers/180 is not documented anywhere on the provider's site","No OpenAPI schema or response examples available","Documentation pages (docs, pricing, README) render only 'Connect wallet' with no useful content","The 'transfers' path does not appear in the provider's listed API categories"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/180","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests/responses, and the specific purpose of /api/v1/transfers/180 is undocumented. The docs pages are empty beyond a wallet-connect 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'/request':16,34 '0.02':15,33,83,131 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':123 '6':135 'Base network API' 'USDC micropayment endpoint' 'accept':115 'access':7,25,44,97 'actual':201 'address':139 'advertis':80 'ai':70 'amount':121 'analyt':69 'api':6,24,43,58,90,167 'avail':186 'base':9,27,105,125,147 'behavior':202 'call':4,22 'categori':66,168 'challeng':109 'confirm':110 'connect':197 'contract':145 'crypto-paid API' 'data':68 'decim':136 'detail':180 'doc':188 'document':181 'endpoint':38,52,59,112,157,176,209 'equal':130 'exampl':183 'explicit':172 'financ':73 'flat':82 'format':205 'function':153 'given':132 'howev':150 'includ':67 'infrastructur':76 'instant':96 'json-response' 'key':91 'land':163 'learn':72 'limit':94 'list':165,173 'live':114 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':71 'mani':57 'maximum':120 'model':87 'network':10,28,106 'no-api-key' 'offer':60 'one':55 'openapi':178 'page':164,192 'particular':208 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,98,138 'per':3,21,84 'post':116 'post-method' 'premium':5,23,42 'price':86,189 'prompt':199 'protocol':13,31,49 'provid':41,63,79,161 'rate':93 'readm':191 'remain':210 'render':194 'request':85,117 'respons':184,204 'schema':179 'settl':100 'span':65 'specif':51,152 'transfer':175 'transfers API' 'unclear':159 'undocu':211 'unit':126 'usdc':18,36,102,128,133,144 'usdc-base-network' 'util':77 'various':166 'via':11,29,45 'wallet':198 'web3':74 'x402':12,30,47,108 'x402 API' 'x402-payment'","prices":[{"id":"acefa973-266c-4427-8136-a053d0157198","listingId":"9a0aeabe-a088-4b9a-8e1a-e7f2f41e2e7c","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:40.407Z"}],"sources":[{"listingId":"9a0aeabe-a088-4b9a-8e1a-e7f2f41e2e7c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:40.407Z","lastSeenAt":"2026-04-23T20:33:15.134Z"}],"details":{"listingId":"9a0aeabe-a088-4b9a-8e1a-e7f2f41e2e7c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/180 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/180"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/180"}],"useCases":["Programmatic access to premium data or services without subscription commitments","Agent-driven workflows that need instant API access without key provisioning","Micropayment-gated API calls settled on Base L2"],"bestFor":["Developers wanting zero-friction API access without signup","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription models"],"notFor":["Users needing detailed API documentation before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.403Z"},"updatedAt":"2026-04-23T20:33:15.134Z"}}