x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/45/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 45) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).

The provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under the Finance & Web3 category and is likely designed to return performance metrics (e.g., returns, time-series data) for a given investment portfolio.

Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint is confirmed live (402 challenge captured), but without documentation it is difficult to know exactly what data is returned or what request body parameters are expected.

Capabilities

x402-paymentusdc-baseportfolio-performancepay-per-requestjson-api

Use cases

  • —Retrieving performance data for a tracked investment portfolio
  • —Integrating portfolio performance metrics into a dashboard or agent workflow
  • —Programmatic access to portfolio returns without API key management

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data with no signup
  • —Micropayment-based access to financial data on Base network
  • —Developers who want keyless, pay-per-call financial APIs

Not for

  • —Users needing detailed API documentation or schema before integrating
  • —Bulk historical data exports requiring thousands of calls (cost adds up at $0.02 each)
  • —Non-crypto-native users who cannot settle USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/45/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/45/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The purpose of the endpoint is only inferable from the URL path.

Warnings

  • —No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt
  • —No OpenAPI or request/response schema provided; request body format and response fields are unknown
  • —This specific endpoint (/portfolios/45) targets a hardcoded portfolio ID; unclear if other portfolio IDs are available or how to discover them

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:37:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/6GmnRu
Portfolio performance data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart