{"id":"f28cbb78-8f5e-4119-af75-82eaab62094e","shortId":"FC3xV4","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 exposes a POST-based transactions API for portfolio #95, gated behind the x402 payment protocol. It accepts USDC payments on the Base network at $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint appears to serve portfolio transaction data or accept transaction submissions for portfolio ID 95. However, the exact request body schema and response format are undocumented — the crawled docs pages returned only a \"Connect wallet\" stub with no further technical detail.\n\nThe endpoint is confirmed live: it returns a well-formed x402 version 1 challenge with scheme \"exact\", settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The asset is USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Timeout is 300 seconds. Because no OpenAPI spec, request/response schemas, or detailed documentation were found, the actual functionality behind this endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment endpoint","lowpaymentfee API","Base network API","pay-per-request API","crypto-gated endpoint"],"warnings":["No request or response schema documented — actual input/output format is unknown","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content","The purpose of 'portfolios/95/transactions' is unclear — it could be a demo or placeholder endpoint","No OpenAPI or machine-readable spec available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/95/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/95/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the docs/pricing/README pages all returned only 'Connect wallet' stubs. The actual functionality of this specific endpoint is 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'000':62 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':191 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':199 '1':183 '20':61 '300':202 '6':68 '95':42,143 'Base network API' 'USDC micropayment endpoint' 'accept':50,137 'access':93 'actual':216 'address':190 'ai/ml':112 'analyt':111 'api':39,71,108 'appear':130 'asset':195 'attach':80 'base':8,22,37,55,63,193 'base-network' 'behind':44,218 'bodi':148 'broad':102 'call':12,26 'caller':78 'catalog':103 'challeng':184 'confirm':173 'connect':162 'contract':198 'crawl':156 'crypto-gated endpoint' 'data':110,116,135 'decim':69 'detail':169,211 'doc':157 'document':212 'endpoint':6,20,30,129,171,220 'exact':146,187 'expos':33 'financ':114 'form':180 'format':152 'found':214 'function':217 'gate':3,17,43,107 'header':85 'host':97 'howev':144 'id':142 'infer':113 'infrastructur':118 'key':72 'limit':75 'live':174 'lowpaymentfee API' 'lowpaymentfee.com':32,99 'network':56 'no-api-key' 'offer':100 'opaqu':222 'openapi':206 'page':158 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':47,52,84,90 'per':11,25,59,125 'portfolio':4,18,41,133,141 'portfolio transactions API' 'portfolio-transactions' 'post':36 'post-bas':35 'post-endpoint' 'price':121 'proof':91 'protocol':48 'rate':74 'remain':221 'request':60,126,147 'request/response':208 'requir':77 'resourc':95 'respons':151 'return':159,176 'schema':149,209 'scheme':186 'second':203 'serv':132 'settl':188 'simpli':79 'site':98 'span':109 'spec':207 'specif':128 'stub':164 'submiss':139 'technic':168 'timeout':200 'transact':5,19,38,134,138 'undocu':154 'uniform':122 'unit':64 'usdc':14,28,51,66,197 'usdc-settlement' 'util':119 'valid':88 'version':182 'wallet':163 'web3':115 'well':179 'well-form':178 'x':83 'x-payment':82 'x402':2,16,46,89,106,181 'x402 paid API' 'x402-gated':1,15,105 'x402-payment'","prices":[{"id":"6917d102-e5be-4210-b7c7-3084d1be4978","listingId":"f28cbb78-8f5e-4119-af75-82eaab62094e","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/95/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":"2026-04-18T18:53:44.677Z"}],"sources":[{"listingId":"f28cbb78-8f5e-4119-af75-82eaab62094e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/95/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:44.677Z","lastSeenAt":"2026-04-27T14:05:19.607Z"}],"details":{"listingId":"f28cbb78-8f5e-4119-af75-82eaab62094e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/95/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 version 1 challenge with maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/transactions"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' stubs","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Submitting or retrieving transactions for a specific portfolio via micropayment","Integrating pay-per-call portfolio data into an agent workflow","Accessing financial transaction data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use portfolio transaction access","Automated workflows needing low-friction API access at $0.02/call"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","High-volume batch processing where per-call pricing adds up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.484Z"},"updatedAt":"2026-04-27T14:05:19.607Z"}}