x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/4/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data behind an x402 paywall. The specific resource `/api/v1/portfolios/4/performance` returns JSON data related to portfolio #4's performance metrics. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request (20,000 base units with 6 decimals).

The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so there is no schema documentation, example payloads, or detailed field descriptions available for this endpoint.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. It accepts POST requests and outputs application/json. Because the endpoint path suggests a specific portfolio ID (4), it is unclear whether other portfolio IDs are supported or how the request body should be structured. Without documentation or an OpenAPI spec, consumers will need to experiment or contact the provider for integration details.

Capabilities

x402-paymentportfolio-performanceusdc-base-networkmicropaymentjson-apipost-method

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or trading bots
  • —Agent-driven portfolio monitoring with per-request micropayments

Fit

Best for

  • —Developers needing on-demand portfolio performance data without API key management
  • —AI agents that can settle x402 payments on Base for financial data
  • —Low-volume or sporadic access to portfolio analytics at $0.02/call

Not for

  • —High-frequency bulk data retrieval where per-request pricing adds up
  • —Users who need detailed API documentation or schema guarantees before integrating
  • —Non-crypto-native consumers who cannot settle USDC payments on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/4/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/4/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. All doc pages return only 'Connect wallet' with no content. The endpoint path and description are generic ('Premium API Access'), making it hard to know what data is actually returned.

Warnings

  • —No API documentation available — all doc pages return only 'Connect wallet'
  • —No OpenAPI or output schema provided; request body format is unknown
  • —Endpoint targets a hardcoded portfolio ID (4); unclear if other IDs are supported
  • —Provider site lists many endpoints across diverse categories but none have documented schemas

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:31:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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