{"id":"03d609f7-d78c-40c1-8964-d0547bd28aab","shortId":"pfNKcJ","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via an x402 payment-gated POST request. The specific resource `/api/v1/portfolios/98/transactions` appears to serve transaction records for portfolio ID 98. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe parent site lowpaymentfee.com hosts a broad catalog of x402-enabled API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here (`/portfolios/98/transactions`) is not prominently featured on the site's landing page, and no dedicated documentation, request schema, or response schema is available for it. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the generic site description, the actual data returned by this endpoint is unknown. Callers should expect to POST JSON and receive JSON back (mimeType is application/json), but the exact fields are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","per-call-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions","transaction history","x402 API","pay-per-call API","USDC micropayment","Base network API","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available for this endpoint","The /portfolios/98/transactions path is not listed on the site's main API catalog — it may be a demo or internal resource","All documentation pages (docs, pricing, api, README) returned only a 'Connect wallet' prompt with no usable content","The purpose and data returned by this specific endpoint are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/98/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/98/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific portfolio endpoint is not listed on the site's landing page. Effectively a stub 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'/portfolios/98/transactions':135 '0.02':77,114 '000':81 '0x8335':70 '20':80 '2913':71 '6':85 '98':59 'Base network API' 'USDC micropayment' 'access':34 'actual':194 'ai/ml':104 'analyt':103 'api':99,119,163 'appear':51 'application/json':214 'avail':156 'back':211 'base':8,22,65,82 'base-network' 'beyond':188 'broad':93 'call':12,26 'caller':202 'catalog':94 'commit':127 'connect':169 'content':175 'contract':69 'cost':75 'data':38,102,107,195 'decim':86 'dedic':148 'descript':192 'doc':160 'document':149,187 'enabl':98 'endpoint':6,20,30,100,131,199 'exact':217 'exampl':184 'expect':204 'featur':139 'field':218 'finance/web3':106 'gate':3,17,44 'generic':190 'host':91 'howev':128 'id':58 'infer':105 'infrastructur':109 'json':207,210 'key':120 'land':144 'limit':123 'list':133 'lowpaymentfee' 'lowpaymentfee.com':32,90 'maximum':74 'mimetyp':212 'minimum':126 'network':66 'no-api-key' 'openapi':180 'page':145,164 'paid':9,23 'parent':88 'pay-per-call API' 'payment':43,60 'payment-g':42 'per':11,25,78,115 'per-cal':10,24 'per-call-pricing' 'portfolio':4,18,36,57 'portfolio transactions' 'portfolio-transactions' 'post':45,206 'price':112,161 'promin':138 'prompt':171 'provid':33 'rate':122 'receiv':209 'record':55 'request':46,79,116,150 'request/response':183 'resourc':49 'respons':153 'return':166,196 'schema':151,154 'serv':53 'settl':62 'site':89,142,191 'span':101 'spec':181 'specif':48,130 'transact':5,19,37,54 'transaction history' 'undocu':220 'unit':83 'unknown':201 'usdc':14,28,68 'usdc-settlement' 'use':67 'util':110 'via':39 'wallet':170 'x402':2,16,41,97 'x402 API' 'x402-enabled':96 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ba0f9eaf-7b3d-4662-94f6-cbadac19543f","listingId":"03d609f7-d78c-40c1-8964-d0547bd28aab","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/98/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":"2026-04-18T18:53:39.855Z"}],"sources":[{"listingId":"03d609f7-d78c-40c1-8964-d0547bd28aab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/98/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:39.855Z","lastSeenAt":"2026-04-27T14:05:19.413Z"}],"details":{"listingId":"03d609f7-d78c-40c1-8964-d0547bd28aab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/98/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 a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/98/transactions"},{"claim":"The 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/98/transactions"}],"useCases":["Retrieving transaction records for a specific portfolio","Integrating portfolio transaction data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-call payment"],"bestFor":["Agents or apps 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-use over monthly plans"],"notFor":["High-volume bulk transaction data export (no documented batch endpoints)","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.704Z"},"updatedAt":"2026-04-27T14:05:19.413Z"}}