{"id":"4410b65f-8372-470b-9c9c-b2e5946baf94","shortId":"cnpK8A","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/transactions/53` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maxAmountRequired of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). Payment is made via the X-PAYMENT header with a 300-second timeout window.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. The specific functionality of the `/api/v1/transactions/53` path is not documented; it may relate to a transaction lookup or financial data endpoint, but this is speculative. The platform advertises a broad suite of endpoints but provides no schemas, example requests, or response formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","transaction API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/transactions/53 is undocumented and unclear","No request or response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/53","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/transactions/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via 402 challenge with clear pricing, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually returns. The docs pages are empty beyond a wallet connect 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'/request':13,28 '0.02':12,27,76,123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20000':118 '300':139 '6':126 'Base network API' 'USDC micropayment API' 'accept':103 'access':7,22,38 'addit':163 'advertis':193 'ai':63 'analyt':62 'api':6,21,37,88,149 'base':9,24,84,114,119 'base-network' 'broad':195 'call':4,19 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':158 'contract':111 'correspond':121 'crypto-paid API' 'data':61,185 'decim':127 'detail':165 'doc':148 'document':143,175 'endpoint':32,52,72,100,186,198 'exampl':203 'extrem':145 'financ':66 'financi':184 'format':207 'function':168 'header':136 'includ':60 'infrastructur':69 'key':89 'learn':65 'limit':91 'live':102 'lookup':182 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'made':130 'mani':51 'maxamountrequir':116 'may':177 'network':85 'no-api-key' 'offer':53 'one':49 'page':153 'path':46,172 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':79 'payment':42,108,128,135 'per':3,18,77 'platform':56,192 'post':104 'post-method' 'premium':5,20,36 'price':74,150 'prompt':160 'protocol':43 'provid':35,200 'rate':90 'readm':152 'relat':178 'render':155 'request':78,105,204 'requir':94 'respons':206 'schema':202 'second':140 'settl':107 'span':58 'spars':146 'specif':45,167 'specul':190 'suit':196 'technic':164 'timeout':141 'transact':181 'transaction API' 'unit':120 'usdc':15,30,81,110,124 'usdc-settlement' 'use':125 'util':70 'via':10,25,39,131 'wallet':159 'web3':67 'window':142 'x':134 'x-payment':133 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"accf1243-d922-4460-8f8d-1e864c75d186","listingId":"4410b65f-8372-470b-9c9c-b2e5946baf94","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/transactions/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:58.576Z"}],"sources":[{"listingId":"4410b65f-8372-470b-9c9c-b2e5946baf94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:58.576Z","lastSeenAt":"2026-04-24T02:02:57.845Z"}],"details":{"listingId":"4410b65f-8372-470b-9c9c-b2e5946baf94","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/53 \\\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 commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network, maxAmountRequired 20000 base units (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/53"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/53"}],"useCases":["Accessing premium data or transaction information without subscription commitments","Integrating pay-per-use API calls into agent workflows on Base","Testing x402 payment protocol integrations with low-cost endpoints"],"bestFor":["Developers wanting no-signup, pay-per-call API access","Agents that can settle USDC payments on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.411Z"},"updatedAt":"2026-04-24T02:02:57.845Z"}}