{"id":"a07e50b0-b64b-41cf-bbc0-1ab378e0b3a2","shortId":"6Fg9kv","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, paid per-request in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data (portfolio ID 68) via the x402 payment protocol. It accepts POST requests and charges $0.02 per call in USDC on the Base network. Payment is handled entirely through the x402 challenge-response mechanism — no API keys or accounts are required.\n\nThe parent site (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, the specific endpoint probed here (/api/v1/portfolios/68/transactions) is not listed on the site's public catalog, suggesting it may be a specialized or less-documented resource. No OpenAPI schema, detailed documentation, or example responses were found for this endpoint; the docs, pricing, and README pages all resolve to a wallet-connect prompt with no substantive content.\n\nThe endpoint is confirmed live: it returns a well-formed x402 v1 challenge with USDC (contract 0x8335…2913) on Base, a maxAmountRequired of 20000 base units ($0.02), and a 300-second payment timeout. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-transactions","per-request-billing","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 schema or endpoint documentation available","This specific endpoint (/api/v1/portfolios/68/transactions) is not listed on the provider's public API catalog","Docs, pricing, and README pages contain no substantive content (only wallet-connect prompts)","Response format and accepted request body are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/68/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/68/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, but there is no documentation, no OpenAPI schema, no example request/response, and the specific endpoint is not even listed on the provider's public catalog. Effectively a stub with confirmed 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'0.02':53,106,194 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '0x8335':184 '20000':191 '2913':185 '300':197 '68':41 'Base network API' 'USDC micropayment' 'accept':48 'access':34 'account':77 'address':203 'ai/ml':96 'analyt':95 'api':74,92 'base':8,22,60,187,192 'broader':86 'call':55 'catalog':124 'challeng':70,180 'challenge-respons':69 'charg':52 'confirm':170 'connect':161 'content':166 'contract':183 'data':38,94,99 'detail':139 'doc':150 'document':134,140 'endpoint':6,20,30,112,148,168 'entir':65 'exampl':142 'finance/web3':98 'form':177 'found':145 'gate':3,17,91 'handl':64 'host':84 'howev':109 'id':40 'infer':97 'key':75 'less':133 'less-docu':132 'list':118 'live':171 'lowpaymentfee' 'lowpaymentfee.com':32,83 'maxamountrequir':189 'may':127 'mechan':72 'network':61 'no-api-key' 'openapi':137 'page':154 'paid':9,23 'parent':81 'pay-per-call API' 'payment':45,62,199 'payto':202 'per':11,25,54,107 'per-request':10,24 'per-request-billing' 'portfolio':4,18,36,39 'portfolio transactions' 'portfolio-transactions' 'post':49 'price':104,151 'probe':113 'prompt':162 'protocol':46 'provid':33 'public':123 'readm':153 'request':12,26,50,108 'requir':79 'resolv':156 'resourc':135 'respons':71,143 'return':173 'schema':138 'second':198 'servic':102 'site':82,121 'span':93 'special':130 'specif':111 'substant':165 'suggest':125 'suit':87 'timeout':200 'transact':5,19,37 'transaction history' 'unit':193 'usdc':14,28,57,182 'usdc-base' 'util':101 'v1':179 'via':42 'wallet':160 'wallet-connect':159 'well':176 'well-form':175 'x402':2,16,44,68,90,178 'x402 API' 'x402-gated':1,15,89 'x402-payment'","prices":[{"id":"93e5a51a-f5a2-417e-a0f9-edff6aa3d177","listingId":"a07e50b0-b64b-41cf-bbc0-1ab378e0b3a2","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/68/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":"2026-04-18T18:53:18.249Z"}],"sources":[{"listingId":"a07e50b0-b64b-41cf-bbc0-1ab378e0b3a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/68/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:18.249Z","lastSeenAt":"2026-04-27T18:36:24.610Z"}],"details":{"listingId":"a07e50b0-b64b-41cf-bbc0-1ab378e0b3a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/68/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":"The endpoint returns a valid x402 v1 challenge with USDC on Base, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68/transactions"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68/transactions"}],"useCases":["Retrieving transaction history for a specific portfolio","Integrating portfolio data into automated trading or analytics pipelines","Agent-driven financial data retrieval without pre-registration"],"bestFor":["Agents needing on-demand portfolio transaction data without signup","Developers experimenting with x402 payment flows on Base","Micropayment-based access to financial data"],"notFor":["Users needing detailed API documentation or schema guarantees before integrating","High-volume batch retrieval where per-request pricing is cost-prohibitive","Non-crypto-native consumers who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.711Z"},"updatedAt":"2026-04-27T18:36:24.610Z"}}