{"id":"c3498321-1343-4c7f-b488-180374f6370a","shortId":"JLp3kH","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/25/transactions` accepts POST requests and is gated behind a per-call USDC payment on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site-wide pricing of $0.02/request.\n\nlowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model, require no API keys, and settle payments on the Base L2 network using USDC. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or what POST body it expects. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee","Base network API","crypto portfolio data","transaction history API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The specific purpose and data returned by /api/v1/portfolios/25/transactions is unknown","Portfolio ID '25' is hardcoded in the URL with no explanation of what portfolio it references"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/25/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/25/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 402 challenge, confirming it accepts POST requests with USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose and data model of the portfolio transactions endpoint are entirely 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'/request':92,135 '0.02':79,91,134 '000':74 '20':73 '402':216 'Base network API' 'USDC pay-per-call API' 'accept':48 'access':34,160 'actual':200 'advertis':68,154 'ai/ml':106 'analyt':105 'api':102,140,167 'base':8,22,63,75,147 'base-network' 'behind':54 'bodi':205 'broader':96 'call':12,26,58 'challeng':67,217 'classif':110 'confirm':211 'connect':176 'consist':83 'content':182 'convers':127 'cost':71 'crypto portfolio data' 'data':38,104 'descript':193 'difficult':225 'doc':166 'document':161,222 'embed':111 'endpoint':6,20,30,130,199,209 'estim':121 'exampl':190 'exchang':116 'expect':207 'experiment':229 'extrem':163 'feed':115 'financ':112 'gas':120 'gate':3,17,53,101 'generat':128 'geocod':125 'host':94 'infer':107 'infrastructur':123 'instant':159 'key':141 'l2':148 'lack':220 'limit':157 'live':212 'lowpaymentfee' 'lowpaymentfee.com':32,93 'make':223 'maximum':70 'model':137 'network':64,149 'no-api-key' 'openapi':186 'page':171 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payment':42,60,144 'per':11,25,57,81 'per-cal':56 'platform':153 'portfolio':4,18,36,197 'portfolio transactions API' 'portfolio-transactions' 'post':49,204 'price':89,114,136,168 'prompt':178 'protocol':43 'provid':33 'quot':119 'rate':117,156 'readm':170 'render':173 'request':50,82 'request/response':189 'requir':138 'resourc':46 'return':201,213 'schema':187 'sentiment':108 'settl':143 'share':131 'site':87 'site-wid':86 'span':103 'spars':164 'specif':45 'substant':181 'suit':97 'summar':109 'token':118 'transact':5,19,37,198 'transaction history API' 'unit':76 'usd':80 'usdc':14,28,59,78,151 'usdc-settlement' 'use':150,227 'util':124 'valid':126,215 'via':39 'wallet':177 'web3':113 'wide':88 'without':228 'x402':2,16,41,66,100 'x402 finance endpoint' 'x402-gated':1,15,99 'x402-payment'","prices":[{"id":"da2ff8c8-8aed-4236-a98e-322ca36ae46f","listingId":"c3498321-1343-4c7f-b488-180374f6370a","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/25/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":"2026-04-18T18:52:30.280Z"}],"sources":[{"listingId":"c3498321-1343-4c7f-b488-180374f6370a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/25/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:30.280Z","lastSeenAt":"2026-04-28T03:33:43.408Z"}],"details":{"listingId":"c3498321-1343-4c7f-b488-180374f6370a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/25/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/25/transactions"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/25/transactions"}],"useCases":["Retrieving transaction data for a specific portfolio via pay-per-call USDC payments","Integrating portfolio transaction lookups into agent workflows without API key management","Accessing financial transaction records through x402 micropayments on Base"],"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 per-call pricing over monthly plans"],"notFor":["Users who need detailed API documentation or schema definitions before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.094Z"},"updatedAt":"2026-04-28T03:33:43.408Z"}}