{"id":"04fa980d-5e96-4c0b-abc3-c6750bd27ff5","shortId":"q7JY5r","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 a POST request to `/api/v1/portfolios/60/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe specific endpoint probed here returns an x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the x402 exact scheme, meaning each call requires a one-shot micropayment in the `X-PAYMENT` header. No API keys, subscriptions, or rate limits are advertised — access is purely pay-per-use.\n\nDocumentation is extremely sparse. The landing page lists available endpoints with brief labels but provides no request/response schemas, parameter descriptions, or example payloads. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional content. Because this specific endpoint path references a portfolio ID (60) and \"transactions,\" it likely returns or creates transaction records for a given portfolio, but the exact input format and response structure are undocumented. Agents should expect to send a JSON POST body and receive a JSON response, but the precise fields are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No request or response schema is documented for this endpoint","The portfolio ID '60' is hardcoded in the path — unclear if other portfolio IDs are valid","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The exact purpose of this endpoint (read vs. write transactions) is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/60/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/60/transactions","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the purpose of this specific endpoint (portfolios/60/transactions) is only inferable from the URL path. The docs, pricing, and README pages are all empty beyond a wallet connect 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'/api/v1/portfolios/60/transactions':44 '/docs':191 '/pricing':193 '/readme':195 '/request':124 '0.02':111,123 '000':94 '0x8335':99 '20':93 '2913':100 '402 payment required' '6':106 '60':217 'Base network API' 'USDC pay-per-call' 'access':34,160 'across':125 'addit':206 'advertis':119,159 'agent':241 'ai/ml':65 'analyt':64 'api':61,152 'avail':175 'base':8,22,75,95,102 'base-network' 'bodi':249 'brief':178 'broader':50 'call':12,26,138 'challeng':87 'connect':201 'consist':114 'content':207 'creat':224 'crypto payment API' 'data':38,63 'decim':107 'descript':186 'document':167 'endpoint':6,20,30,81,127,176,211 'exact':134,233 'exampl':188 'expect':243 'extrem':169 'field':258 'finance/web3':67 'flat':120 'format':235 'gate':3,17,60 'given':229 'header':150 'id':216 'infer':66 'infrastructur':69 'input':234 'json':247,253 'key':153 'label':179 'land':172 'like':221 'limit':157 'list':174 'lowpaymentfee' 'lowpaymentfee.com':32,52 'made':130 'mean':136 'micropay':144 'network':76 'no-api-key' 'offer':54 'one':142 'one-shot':141 'page':173,196 'paramet':185 'part':47 'path':212 'pay':10,24,164 'pay-per-cal':9,23 'pay-per-request' 'pay-per-us':163 'payload':189 'payment':89,128,149 'per':11,25,112,165 'platform':51 'portfolio':4,18,36,215,230 'portfolio transactions API' 'portfolio-transactions' 'post':41,248 'precis':257 'price':121 'probe':82 'prompt':203 'provid':33,181 'pure':162 'rate':156 'receiv':251 'record':226 'refer':213 'render':198 'request':42,88,113 'request/response':183 'requir':139 'respons':237,254 'return':84,222 'schema':184 'scheme':135 'send':245 'settl':72 'shot':143 'sinc':103 'site':117 'span':62 'spars':170 'specif':80,210 'structur':238 'subscript':154 'transact':5,19,37,219,225 'translat':109 'undocu':240 'unit':96 'unknown':260 'usdc':14,28,78,98,104 'usdc-settlement' 'use':77,105,166 'util':70 'varieti':56 'via':39,131 'wallet':202 'x':148 'x-payment':147 'x402':2,16,59,86,133 'x402 micropayment API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"8127c657-e769-4df3-84cb-e1f62159016c","listingId":"04fa980d-5e96-4c0b-abc3-c6750bd27ff5","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/60/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":"2026-04-18T18:53:04.962Z"}],"sources":[{"listingId":"04fa980d-5e96-4c0b-abc3-c6750bd27ff5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/60/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:04.962Z","lastSeenAt":"2026-04-27T21:34:10.200Z"}],"details":{"listingId":"04fa980d-5e96-4c0b-abc3-c6750bd27ff5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/60/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/transactions"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/transactions"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or creating transaction records for a specific portfolio","Integrating pay-per-call financial data into agent workflows","Accessing portfolio data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-per-request portfolio transaction access","Developers exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.363Z"},"updatedAt":"2026-04-27T21:34:10.200Z"}}