x402basequality 0.30

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/26/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 26) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).

The provider 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 request. This particular endpoint sits under the finance category and appears to return performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.

Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint is confirmed live (returns a valid 402 challenge), but the actual shape of the response and what inputs it expects in the POST body are unknown.

Capabilities

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

Use cases

  • —Retrieve performance data for a tracked portfolio via a single micropayment
  • —Integrate portfolio performance metrics into an automated trading or reporting pipeline
  • —Agent-driven portfolio monitoring without API key management

Fit

Best for

  • —Developers wanting keyless, pay-per-call portfolio performance data
  • —AI agents that can settle x402 payments on Base
  • —Quick one-off portfolio performance lookups without subscription commitments

Not for

  • —Users needing detailed documentation or schema before integrating
  • —Bulk historical portfolio backtesting (no evidence of batch support)
  • —Users without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/26/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/26/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 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 are empty stubs. The purpose of the endpoint can only be inferred from the URL path. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — request body and response shape are completely unknown
  • —All doc/pricing/API pages return only a 'Connect wallet' prompt with no content
  • —Portfolio ID 26 is hardcoded in the URL; unclear if other portfolio IDs are accessible or what they represent
  • —No information on what 'performance' data is actually returned (returns, time series, benchmarks, etc.)

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:23:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/C58Anb
Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC. — Clawmart · Clawmart