{"id":"3d554f62-363f-48ed-adfc-02f166929d1b","shortId":"mcq3qE","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 a specific portfolio (ID 79) behind an x402 paywall. The x402 challenge confirms it is live and accepts exact-scheme payments on the Base network in USDC (contract 0x8335…2913). The maximum amount required per call is 20,000 base units of USDC, which with 6 decimals equals $0.02 per request.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (/api/v1/portfolios/79/transactions) is not explicitly documented on the site's landing page or in any crawled documentation. Its description in the x402 challenge is simply \"Premium API Access,\" and no request/response schema is provided beyond the fact that it accepts HTTP POST and returns application/json.\n\nBecause there is no OpenAPI spec, no detailed docs, and no example payloads available for this particular endpoint, the exact functionality — what fields to send, what transaction data is returned — remains unclear. The endpoint is confirmed live (402 challenge captured), and the pricing and payment mechanics are well-defined, but consumers will need to experiment or contact the provider to understand the request format.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","portfolio-transactions","http-post","json-response"],"categories":["finance","web3"],"synonyms":["portfolio transactions API","x402 paid endpoint","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call transactions","crypto payment API"],"warnings":["No documentation or schema available for /api/v1/portfolios/79/transactions — the endpoint is not listed on the provider's landing page","Crawled docs, API, pricing, and README pages all returned only 'Connect wallet' with no substantive content","Request and response formats are unknown; consumers must experiment or contact the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/79/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/79/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 via a valid x402 402 challenge, and pricing/payment details are clear. However, there is no OpenAPI spec, no request/response schema, no documentation for this specific endpoint, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'0.02':90,120 '000':80 '0x8335':70 '20':79 '2913':71 '402':221 '6':87 '79':45 'Base network API' 'USDC micropayment API' 'accept':58,178 'access':166 'advertis':97 'ai/ml':110 'amount':74 'analyt':109 'api':39,106,125,165 'application/json':183 'avail':197 'base':8,22,37,65,81 'behind':46 'beyond':173 'broad':99 'call':12,26,77,122 'captur':223 'catalog':100 'challeng':52,161,222 'commit':132 'confirm':53,219 'consum':235 'contact':241 'contract':69 'crawl':154 'crypto payment API' 'data':108,113,211 'decim':88 'defin':233 'descript':157 'detail':191 'doc':192 'document':144,155 'endpoint':6,20,30,136,201,217 'equal':89 'exact':60,203 'exact-schem':59 'exampl':195 'experi':239 'explicit':143 'expos':33 'fact':175 'field':206 'finance/web3':112 'format':248 'function':204 'gate':3,17 'host':94 'howev':133 'http':179 'http-post' 'id':44 'infer':111 'infrastructur':115 'json-response' 'key':126 'land':149 'limit':129 'list':138 'live':56,220 'lowpaymentfee' 'lowpaymentfee.com':32,96 'maximum':73 'mechan':229 'need':237 'network':66 'openapi':188 'page':150 'particular':200 'pay':10,24,103 'pay-per-cal':9,23 'pay-per-call transactions' 'pay-per-request':102 'payload':196 'payment':62,228 'paywal':49 'per':11,25,76,91,104,121 'portfolio':4,18,43 'portfolio transactions API' 'portfolio-transactions' 'post':36,180 'post-bas':35 'premium':164 'price':118,226 'provid':172,243 'rate':128 'remain':214 'request':92,105,247 'request/response':169 'requir':75 'return':182,213 'schema':170 'scheme':61 'send':208 'simpli':163 'site':95,147 'span':107 'spec':189 'specif':42,135 'transact':5,19,38,210 'unclear':215 'understand':245 'unit':82 'usdc':14,28,68,84 'usdc-base-network' 'util':116 'well':232 'well-defin':231 'x402':2,16,48,51,160 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a589f717-657b-4ed2-854f-76b695535382","listingId":"3d554f62-363f-48ed-adfc-02f166929d1b","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/79/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":"2026-04-18T18:53:30.281Z"}],"sources":[{"listingId":"3d554f62-363f-48ed-adfc-02f166929d1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/79/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:30.281Z","lastSeenAt":"2026-04-23T00:32:04.766Z"}],"details":{"listingId":"3d554f62-363f-48ed-adfc-02f166929d1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/79/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge confirms the endpoint is live, accepts USDC on Base network, with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/portfolios/79/transactions"},{"claim":"The site advertises all APIs at $0.02/request 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/79/transactions"}],"useCases":["Fetching or submitting portfolio transaction records via a pay-per-call model","Integrating low-cost financial transaction data into agent workflows","Programmatic access to portfolio data without API key management"],"bestFor":["Agents or bots that need on-demand portfolio transaction data with no signup","Developers experimenting with x402 payment-gated APIs on Base","Micropayment-based access to financial endpoints"],"notFor":["Users who need well-documented request/response schemas before integrating","High-volume batch processing where per-request fees add up","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.14Z"},"updatedAt":"2026-04-23T00:32:04.766Z"}}