x402basequality 0.40

Portfolio performance data via x402 micropayment on Base network, $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/57/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 57) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.

The provider lowpaymentfee.com hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint is focused on portfolio performance. The exact schema of the response (what performance metrics are returned) is not documented in the available crawl material, so consumers should expect a JSON object but cannot confirm the precise fields without making a paid call.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet. The maximum timeout for payment settlement is 300 seconds.

Capabilities

x402-paymentportfolio-performanceusdc-basepay-per-requestjson-apino-api-key

Use cases

  • —Retrieve performance metrics for a tracked portfolio on-demand
  • —Integrate portfolio performance data into dashboards or agent workflows
  • —Automated portfolio monitoring with per-call billing and no subscription

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data without API key management
  • —Developers who want pay-per-use financial data with crypto settlement
  • —Low-volume consumers who prefer micropayments over monthly subscriptions

Not for

  • —High-frequency trading systems that need sub-second latency and bulk data
  • —Users without access to USDC on the Base network for payment

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/57/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/57/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live with a valid x402 challenge and clear pricing, but there is no OpenAPI schema, no documented request/response format, and no examples. The crawled docs/pricing/api pages returned only 'Connect wallet' with no useful content. The specific portfolio performance data returned is unknown.

Warnings

  • —No response schema or example response documented — the exact fields returned are unknown
  • —Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'
  • —This endpoint is for a specific portfolio ID (57); it is unclear whether other portfolio IDs are available or how they are discovered
  • —No OpenAPI spec or AI plugin manifest found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:49:07Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/8M8YH3
Portfolio performance data via x402 micropayment on Base network, $0.02/request. — Clawmart · Clawmart