x402basequality 0.30

Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/38/holdings

What it does

This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 38. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.

The specific endpoint `/api/v1/portfolios/38/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. No API keys are required; access is granted purely through the x402 payment header. The platform advertises no rate limits and instant access.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know exactly what data is returned or how to structure a request body.

Capabilities

x402-paymentusdc-baseportfolio-holdingspay-per-callno-api-keyjson-response

Use cases

  • —Fetching current holdings for a specific portfolio programmatically
  • —Integrating portfolio data into dashboards or trading bots
  • —Agent-driven portfolio monitoring with per-call micropayments

Fit

Best for

  • —Developers who want keyless, pay-per-call access to portfolio data
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer on-chain micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or request/response schemas before integrating
  • —Bulk data retrieval where per-call pricing would be cost-prohibitive
  • —Users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/38/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/38/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request parameters or response schema. The docs pages are empty (wallet-connect only). The endpoint path suggests portfolio holdings data but nothing confirms what fields are returned. Effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt
  • —No request body schema or response schema documented anywhere
  • —Unknown what data portfolio 38 actually contains or whether the portfolio ID is meaningful to external users
  • —No OpenAPI spec or ai-plugin manifest found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:31:00Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/7NfWfB
Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart