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/11/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 11) via the x402 payment protocol. 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 site lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint sits under the finance category and serves portfolio performance metrics. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.

Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body fields are expected or what shape the response takes.

Capabilities

x402-paymentportfolio-performanceusdc-base-networkmicropaymentjson-apino-api-key

Use cases

  • —Retrieving performance metrics for a tracked investment portfolio
  • —Programmatic portfolio monitoring by AI agents paying per-request via x402
  • —Integrating portfolio performance data into dashboards or trading bots

Fit

Best for

  • —Agents or apps that need on-demand portfolio performance data without API key management
  • —Developers experimenting with x402 micropayment-gated finance APIs
  • —Low-volume consumers who prefer pay-per-call over subscriptions

Not for

  • —Users who need detailed API documentation or request/response schemas before integrating
  • —High-frequency consumers who need bulk pricing or subscription tiers
  • —Anyone needing portfolio data for portfolio IDs other than 11 (no evidence other IDs are supported)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/11/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The purpose ('portfolio performance') is only inferable from the URL path and generic description.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema for request or response bodies
  • —The specific portfolio ID (11) is hardcoded in the URL; unclear if other portfolio IDs exist or how they are created
  • —No information on what fields the response contains or what POST body parameters are accepted

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:16:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

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