{"id":"7cd01ae8-a0a4-4f0e-8e75-456562c6116d","shortId":"97pQjK","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 path `/api/v1/transfers/37` is one of many endpoints offered by this provider, which hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header for settlement. Payment is in USDC on the Base network, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The provider advertises no API keys, no rate limits, and instant access — the only gate is the per-request micropayment. The x402 challenge confirms the endpoint is live and returns application/json responses.\n\nWhile the provider's landing page lists numerous endpoints across categories (sentiment analysis, text summarization, price feeds, geocoding, etc.), this specific listing covers the `/api/v1/transfers/37` path. Documentation beyond the landing page is effectively empty (pages show only \"Connect wallet\"), so the exact functionality of this particular transfer endpoint is unclear. It may relate to a financial transfer or data transfer operation, but no schema or detailed docs are available to confirm.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["infrastructure","finance"],"synonyms":["micropayment API","x402 endpoint","USDC pay-per-call","Base network API","lowpaymentfee","transfer API","crypto-gated API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet'","The specific functionality of /api/v1/transfers/37 is unknown; no input/output schema provided","Provider lists many endpoints but none have detailed specs beyond a title and price"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/37","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/37","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 with clear pricing, but there is no documentation, no request/response schema, and the specific purpose of '/api/v1/transfers/37' is undetermined. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/request':16,34 '0.02':15,33,117 '000':113 '20':112 '6':121 'Base network API' 'USDC pay-per-call' 'accept':87 'access':7,25,44,134 'across':165 'advertis':125 'ai':77 'amount':110 'analysi':168 'analyt':76 'api':6,24,43,73,127 'application/json':154 'avail':224 'base':9,27,105,114 'beyond':183 'broad':66 'call':4,22 'catalog':67 'categori':166 'challeng':146 'confirm':147,226 'connect':193 'cover':178 'crypto-gated API' 'data':75,214 'decim':122 'detail':221 'doc':222 'document':182 'effect':188 'empti':189 'endpoint':38,58,86,149,164,203 'etc':174 'exact':197 'feed':172 'financ':80 'financi':211 'function':198 'gate':137 'geocod':173 'given':118 'header':96 'host':64 'i.e':116 'infrastructur':83 'instant':133 'json-response' 'key':128 'land':160,185 'learn':79 'limit':131 'list':162,177 'live':151 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':78 'mani':57 'maximum':109 'may':207 'micropay':143 'micropayment API' 'network':10,28,106 'no-api-key' 'numer':163 'offer':59 'one':55 'oper':216 'page':161,186,190 'particular':201 'path':52,181 'pay':2,20,70 'pay-per-cal':1,19 'pay-per-request':69 'payment':48,95,99 'per':3,21,71,141 'per-request':140 'post':88 'post-method' 'premium':5,23,42 'price':171 'protocol':13,31,49 'provid':41,62,124,158 'rate':130 'relat':208 'request':72,89,142 'requir':91 'respons':155 'return':153 'schema':219 'sentiment':167 'settlement':98 'show':191 'span':74 'specif':51,176 'summar':170 'text':169 'transfer':202,212,215 'transfer API' 'unclear':205 'unit':115 'usdc':18,36,102,119 'usdc-base-network' 'util':84 'via':11,29,45 'wallet':194 'web3':81 'x':94 'x-payment':93 'x402':12,30,47,145 'x402 endpoint' 'x402-payment'","prices":[{"id":"5bbb4698-7b8e-4d6f-861b-c2498508d306","listingId":"7cd01ae8-a0a4-4f0e-8e75-456562c6116d","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:48.194Z"}],"sources":[{"listingId":"7cd01ae8-a0a4-4f0e-8e75-456562c6116d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:48.194Z","lastSeenAt":"2026-04-23T20:03:20.665Z"}],"details":{"listingId":"7cd01ae8-a0a4-4f0e-8e75-456562c6116d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/37 \\\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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/37"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/37"},{"claim":"maxAmountRequired is 20000 base units (USDC has 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/37"}],"useCases":["Programmatic access to premium data or transfer operations without subscription","Agent-driven API consumption with per-call USDC micropayments","Integrating pay-as-you-go services into automated workflows"],"bestFor":["Developers wanting no-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base network"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.985Z"},"updatedAt":"2026-04-23T20:03:20.665Z"}}