{"id":"bd948896-3975-4080-b7b0-b8bd1f196e0b","shortId":"gfJADr","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. It 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/114` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The timeout for payment is 300 seconds.\n\nThe platform advertises a broad suite of endpoints but documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The exact functionality of the `/api/v1/transactions/114` endpoint is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["infrastructure","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 transactions","micropayment API","USDC pay-per-call","Base network API"],"warnings":["No API documentation available — docs, pricing, and README pages only show 'Connect wallet'","No OpenAPI or schema specification found","Exact functionality of /api/v1/transactions/114 is unclear — 'Premium API Access' is generic","No request body schema or response schema documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/114","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the exact functionality of this specific endpoint is unknown. The docs pages are empty beyond a wallet connect 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'/request':16,34 '0.02':15,33,79,127 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':121 '300':147 '6':132 'Base network API' 'USDC pay-per-call' 'accept':104 'access':7,25,44,208 'address':138 'advertis':151 'ai':66 'analyt':65 'api':6,24,43,91,164,207 'avail':193 'base':9,27,87,123,141 'beyond':203 'broad':153 'call':4,22,135 'categori':62 'challeng':112 'commit':98 'confirm':113 'connect':173 'data':64 'decim':133 'detail':180 'doc':163 'document':158,189 'endpoint':38,55,75,102,156,200 'exact':195 'exampl':192 'extrem':160 'financ':69 'function':196 'generic':205 'includ':63 'infrastructur':72 'json':109 'json-response' 'key':92 'label':209 'learn':68 'limit':95 'live':116 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':67 'mani':54 'maximum':119 'micropayment API' 'network':10,28,88 'no-api-key' 'offer':56 'one':52 'openapi':184 'page':168 'paid':82 'pay':2,20 'pay-per-cal':1,19 'pay-per-request' 'payment':48,145 'per':3,21,80,134 'platform':59,150 'post':105 'post-method' 'premium':5,23,42,206 'price':77,165 'prompt':175 'protocol':13,31,49 'provid':41 'rate':94 'readm':167 'render':170 'request':81,106 'request/response':187 'requir':99,117 'return':108 'schema':188 'second':148 'settl':136 'sinc':129 'span':61 'spars':161 'spec':185 'specif':101 'suit':154 'technic':179 'timeout':143 'unclear':202 'unit':124 'usd':128 'usdc':18,36,84,126,130 'usdc-base-network' 'use':131 'util':73 'via':11,29,45 'wallet':174 'web3':70 'x402':12,30,47,111 'x402 transactions' 'x402-payment'","prices":[{"id":"5e6be91e-8912-4fd9-af18-98cae0085b77","listingId":"bd948896-3975-4080-b7b0-b8bd1f196e0b","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:20.152Z"}],"sources":[{"listingId":"bd948896-3975-4080-b7b0-b8bd1f196e0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:20.152Z","lastSeenAt":"2026-04-25T01:32:59.696Z"}],"details":{"listingId":"bd948896-3975-4080-b7b0-b8bd1f196e0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/114 \\\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, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms 20000 base units USDC (USD Coin, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/114"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300 second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/114"}],"useCases":["Accessing premium data or transaction information with per-call USDC micropayments","Integrating pay-as-you-go API calls into autonomous agent workflows","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access","Users who want no-commitment, no-rate-limit API usage"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume use cases where per-call pricing may add up without bulk discounts","Anyone without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.325Z"},"updatedAt":"2026-04-25T01:32:59.696Z"}}