{"id":"d494887e-4ac6-4c8e-807d-3105aa092500","shortId":"VegbLj","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/75/transactions` accepts POST requests and charges up to $0.02 per call in USDC on the Base network. Payment is handled entirely through the x402 challenge-response flow — no API keys or accounts are required.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific endpoint targets portfolio #75's transactions, and no further documentation about the request body schema, available query parameters, or response format was found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint returned a well-formed 402 challenge with x402 version 1, it is confirmed live. The payment is settled in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3, with a maximum timeout of 300 seconds. Without request/response schema documentation, callers will need to experiment or contact the provider to understand the expected POST body and the shape of the returned transaction data.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee API","Base network API","crypto portfolio data"],"warnings":["No request or response schema documented — callers must guess the POST body format","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content","The endpoint is scoped to portfolio ID 75; it is unclear whether other portfolio IDs are available or what this portfolio represents","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/75/transactions","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/portfolios/75/transactions","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 a valid 402 challenge, but there is no documentation on request body schema, response format, or what 'portfolio 75 transactions' actually returns. Docs pages are empty. This is effectively a stub 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'0.02':55,109 '0x1a2b':189 '0x8335':183 '1':171 '2913':184 '300':196 '402':166 '75':118 '85f3':190 'Base network API' 'USDC pay-per-call API' 'accept':48 'access':34 'account':79 'address':188 'advertis':86 'ai/ml':99 'analyt':98 'api':76,95,145 'avail':130 'base':8,22,62,186 'bodi':128,216 'broad':88 'call':12,26,57 'caller':202 'catalog':89 'challeng':72,167 'challenge-respons':71 'charg':52 'confirm':174 'connect':151 'contact':208 'content':157 'contract':182 'crawl':140 'crypto portfolio data' 'data':38,97,102,224 'doc':142 'document':124,201 'endpoint':6,20,30,115,160 'entir':67 'expect':214 'experi':206 'finance/web3':101 'flow':74 'form':165 'format':135 'found':137 'gate':3,17 'handl':66 'host':83 'howev':112 'infer':100 'key':77 'live':175 'lowpaymentfee API' 'lowpaymentfee.com':32,85 'maximum':193 'need':204 'network':63 'no-api-key' 'page':146 'paramet':132 'pay':10,24,92 'pay-per-cal':9,23 'pay-per-request':91 'payment':42,64,177 'per':11,25,56,93,110 'portfolio':4,18,36,117 'portfolio transactions API' 'portfolio-transactions' 'post':49,215 'price':107,143 'prompt':153 'protocol':43 'provid':33,210 'queri':131 'request':50,94,111,127 'request/response':199 'requir':81 'resourc':46 'respons':73,134 'return':148,161,222 'schema':129,200 'second':197 'servic':105 'settl':179 'shape':219 'site':84 'span':96 'specif':45,114 'substant':156 'target':116 'timeout':194 'transact':5,19,37,120,223 'understand':212 'usdc':14,28,59,181 'usdc-base' 'util':104 'version':170 'via':39 'wallet':152 'well':164 'well-form':163 'without':198 'x402':2,16,41,70,169 'x402 finance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1c087ace-3a18-4aaf-8280-59092226f56a","listingId":"d494887e-4ac6-4c8e-807d-3105aa092500","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/portfolios/75/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:21.824Z"}],"sources":[{"listingId":"d494887e-4ac6-4c8e-807d-3105aa092500","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/75/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:21.824Z","lastSeenAt":"2026-04-27T17:05:04.902Z"}],"details":{"listingId":"d494887e-4ac6-4c8e-807d-3105aa092500","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/75/transactions \\\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 a valid x402 version 1 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/75/transactions"},{"claim":"Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/75/transactions"}],"useCases":["Fetching transaction history for a specific portfolio via micropayment","Integrating portfolio transaction data into an agent workflow without API key management","Programmatic access to financial transaction records with per-call USDC settlement"],"bestFor":["Agents or bots that need on-demand portfolio transaction data without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Low-volume consumers who prefer pay-per-request over monthly plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.575Z"},"updatedAt":"2026-04-27T17:05:04.902Z"}}