{"id":"a54e80a1-4c6e-47e8-ad9d-3b697e24f5d1","shortId":"4PSnRx","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/61/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint probed here returns an x402 challenge (HTTP 402) requiring an `X-PAYMENT` header with an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, 20,000 base units equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts `application/json` and uses x402 version 1.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint path suggests it returns transactions for portfolio ID 61, but the exact request body format and response structure are unknown. The platform advertises no API keys, no rate limits, and instant access, relying entirely on per-request x402 micropayments for access control.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-transactions","post-endpoint","micropayment-api"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 micropayment API","Base USDC API","pay-per-call transactions","lowpaymentfee API","crypto portfolio data"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) are empty beyond a 'Connect wallet' prompt","The endpoint targets a hardcoded portfolio ID (61) with no explanation of how to discover or parameterize portfolio IDs","Request body format and response structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/61/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/61/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 zero documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The endpoint path is specific (portfolio 61) with no explanation of what it returns or what request body it 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'0.02':10,24,79,135 '000':116,131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x8335':121 '1':155 '20':115,130 '2913':122 '300':144 '402':99 '6':128 '61':204 'Base USDC API' 'accept':149 'access':34,227,237 'address':140 'advertis':218 'ai/ml':69 'analyt':68 'api':65,165,220 'application/json':150 'avail':193 'base':8,22,87,117,124,132 'bodi':209 'broader':50 'call':64 'challeng':97 'connect':174 'content':180 'control':238 'crypto portfolio data' 'data':38,67,72 'decim':129 'doc':164 'document':156 'endpoint':6,20,30,91,148,195 'entir':229 'equal':134 'exact':109,207 'exact-schem':108 'exampl':191 'extrem':161 'finance/web3':71 'format':210 'gate':3,17 'header':105 'http':98 'id':203 'infer':70 'infrastructur':74 'instant':226 'key':221 'limit':224 'lowpaymentfee API' 'lowpaymentfee.com':32,52 'micropay':235 'micropayment-api' 'network':88 'offer':54 'openapi':184 'page':169 'part':47 'path':196 'pay':9,23,62 'pay-per-cal':61 'pay-per-call transactions' 'pay-per-request' 'payload':192 'payment':104,111,136 'per':11,25,63,80,232 'per-request':231 'platform':51,217 'portfolio':4,18,36,202 'portfolio transactions API' 'portfolio-transactions' 'post':41 'post-endpoint' 'price':77,166 'probe':92 'prompt':176 'protocol':60 'provid':33 'rate':223 'readm':168 'reli':228 'render':171 'request':12,26,42,81,208,233 'request/response':187 'requir':100 'respons':212 'return':94,199 'schema':188 'scheme':110 'second':145 'sent':138 'settl':82 'sinc':125 'site':159 'span':66 'spec':185 'specif':90 'structur':213 'suggest':197 'thin':162 'timeout':146 'transact':5,19,37,200 'unit':118,133 'unknown':215 'usdc':14,28,84,120,126 'usdc-base' 'use':127,152 'util':75 'varieti':56 'version':154 'via':39 'wallet':175 'x':103 'x-payment':102 'x402':2,16,59,96,153,234 'x402 micropayment API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':58","prices":[{"id":"c3f5ed9e-e9d6-403f-9fa1-d343f5a065fc","listingId":"a54e80a1-4c6e-47e8-ad9d-3b697e24f5d1","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/61/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":"2026-04-18T18:53:03.163Z"}],"sources":[{"listingId":"a54e80a1-4c6e-47e8-ad9d-3b697e24f5d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/61/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:03.163Z","lastSeenAt":"2026-04-27T21:34:10.124Z"}],"details":{"listingId":"a54e80a1-4c6e-47e8-ad9d-3b697e24f5d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/61/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 endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/61/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/61/transactions"}],"useCases":["Fetching transaction history for a specific portfolio via micropayment","Integrating pay-per-call portfolio data into trading bots or dashboards","Agent-driven retrieval of financial transaction records without API keys"],"bestFor":["Developers wanting keyless, pay-per-use access to portfolio transaction data","AI agents that can settle x402 payments on Base","Users who prefer micropayments over subscription-based API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs 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":"2026-02-17T23:13:59.482Z"},"updatedAt":"2026-04-27T21:34:10.124Z"}}