x402basequality 0.35

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/72/holdings

What it does

This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 72) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or commitments required.

The provider site (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request using the same x402 micropayment mechanism on Base. However, this specific endpoint is scoped to portfolio holdings retrieval. The exact schema of the request body and response payload is not documented in the crawled material; the endpoint is discoverable and live (returns a valid 402 challenge), but no OpenAPI spec, example requests, or example responses were found.

Because the docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content, the actual data format, required POST body fields, and response structure remain unknown. Agents should expect a JSON response but will need to experiment or contact the provider for schema details.

Capabilities

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

Use cases

  • —Retrieve portfolio holdings data for portfolio 72 on demand
  • —Integrate portfolio data into trading bots or dashboards without API key management
  • —Agent-driven portfolio monitoring with per-request micropayments

Fit

Best for

  • —Developers needing on-demand portfolio holdings without subscription commitments
  • —AI agents that can settle x402 payments in USDC on Base
  • —Prototyping financial dashboards with low per-call costs

Not for

  • —Users who need bulk or streaming portfolio data at high frequency (no documented batch mode)
  • —Anyone requiring detailed API documentation or guaranteed SLAs before integration
  • —Use cases needing holdings for arbitrary portfolio IDs (this endpoint is scoped to portfolio 72)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/72/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/72/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, and all documentation pages returned only a wallet-connect prompt with no useful content. The purpose of portfolio 72 holdings is not explained.

Warnings

  • —No OpenAPI or schema documentation available — request body and response format are unknown
  • —All doc/pricing/README pages returned only 'Connect wallet' with no substantive content
  • —Endpoint is hardcoded to portfolio ID 72; unclear if other portfolio IDs are supported
  • —Provider site lists many API categories but this specific endpoint's data source and freshness are undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:48:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/QBs5Yg
Portfolio holdings data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart