x402basequality 0.30

Portfolio holdings 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/85/holdings

What it does

This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 85) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The endpoint is part of a broader platform (lowpaymentfee.com) that offers numerous pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific endpoint (/api/v1/portfolios/85/holdings) is not listed on the site's main catalog, and no documentation describes its request body schema or response format. The portfolio ID "85" is hardcoded in the URL, and it is unclear whether other portfolio IDs are available or what data fields the holdings response contains.

The x402 challenge was successfully captured (HTTP 402 with valid accepts array), confirming the endpoint is live. The payment timeout is 300 seconds. No OpenAPI spec, detailed docs, or example responses were found during crawling — the docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentportfolio-holdingsusdc-base-networkpay-per-requestjson-api

Use cases

  • —Retrieve holdings data for portfolio 85 programmatically with per-call micropayments
  • —Integrate portfolio data into trading bots or dashboards without API key management
  • —Agent-driven portfolio monitoring with x402 payment settlement on Base

Fit

Best for

  • —Developers needing pay-per-call portfolio data without subscriptions
  • —AI agents that can settle x402 payments on Base
  • —Quick one-off lookups of portfolio holdings

Not for

  • —Users who need documented request/response schemas before integrating
  • —Bulk or high-frequency data retrieval where per-call pricing is inefficient
  • —Access to arbitrary portfolio IDs (only portfolio 85 is confirmed)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/85/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/85/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation of request/response schemas, no examples, and the endpoint is not listed in the site's own catalog. Effectively a stub with confirmed liveness.

Warnings

  • —No documentation found — docs, pricing, and API pages return only a wallet-connect prompt with no content
  • —Request body schema and response format are completely unknown
  • —This specific endpoint (/api/v1/portfolios/85/holdings) is not listed on the provider's main API catalog
  • —It is unclear what portfolio 85 represents or whether other portfolio IDs exist

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:02:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/ZWuk59
Portfolio holdings data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart