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/100/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for a given portfolio ID (in this case, portfolio 100). It is part of a broader suite of x402-enabled APIs offered by the provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint `/api/v1/portfolios/100/performance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render 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 live (returns a proper 402 challenge), but without documentation it is unclear what request body parameters are expected or what shape the response takes.

Capabilities

x402-paymentusdc-baseportfolio-performancemicropaymentpay-per-requestjson-api

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or agent workflows
  • —Programmatic access to portfolio analytics without API key management

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data with no signup
  • —Developers wanting x402 pay-per-call finance endpoints on Base
  • —Micropayment-based access to financial data without subscriptions

Not for

  • —Users needing detailed API documentation or request/response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription plans
  • —Anyone requiring non-USDC or non-Base-network payment options

Quick start

# Requires an x402-compatible client that can settle USDC on Base
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/100/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/100/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the portfolio performance endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema describing request parameters or response format
  • —Unknown request body format — no examples or field descriptions provided
  • —Portfolio ID '100' is hardcoded in the URL; unclear if other portfolio IDs are supported or how they are obtained

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:22:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/WB2XJn
Portfolio performance data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart