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/53/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 53) behind an x402 paywall. It accepts POST requests and returns 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 x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per call. This particular endpoint falls 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 instantly upon valid x402 payment.

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 the response structure looks like.

Capabilities

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

Use cases

  • —Retrieving performance metrics for a tracked portfolio
  • —Integrating portfolio performance data into dashboards or agents
  • —Programmatic access to financial portfolio analytics without API key management

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data with pay-per-call pricing
  • —Developers who want keyless, instant API access settled via USDC on Base
  • —Lightweight integrations that don't need subscription commitments

Not for

  • —Users needing detailed API documentation or request/response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/53/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 examples. The specific purpose of 'portfolio 53 performance' is opaque. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No request body schema or response schema provided; callers must guess at the expected input
  • —The endpoint targets a hardcoded portfolio ID (53) with no explanation of what this portfolio contains
  • —No OpenAPI or ai-plugin manifest discovered

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:45:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

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