x402basequality 0.35

Portfolio holdings data via x402 micropayment on Base network for $0.02/request

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/50/holdings

What it does

This endpoint at lowpaymentfee.com provides portfolio holdings data for a specific portfolio (ID 50) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20000 base units with 6 decimals = $0.02). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.

The provider site (lowpaymentfee.com) hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. However, the specific endpoint listed here — `/api/v1/portfolios/50/holdings` — is not explicitly documented on the provider's landing page or docs. The docs, pricing, and API pages behind the site all appear to require a wallet connection and contain no further detail. As a result, the exact schema of the request body and response for this holdings endpoint is unknown.

The endpoint is confirmed live: the probe received a well-formed 402 challenge with x402 version 1, specifying USDC (contract 0x8335…) on Base, payable to 0x1A2B…. The output schema indicates an HTTP POST method and that the endpoint is discoverable. Beyond that, no OpenAPI spec, example payloads, or detailed documentation were found.

Capabilities

x402-paymentportfolio-holdingsusdc-basepay-per-requestjson-apino-api-key

Use cases

  • —Retrieving holdings data for portfolio #50 programmatically
  • —Integrating portfolio position data into trading dashboards
  • —Agent-driven portfolio analysis without API key management

Fit

Best for

  • —Developers needing on-demand portfolio holdings data with no subscription
  • —AI agents that can settle x402 micropayments on Base
  • —Applications requiring keyless, pay-per-call financial data access

Not for

  • —Users who need detailed API documentation or schema guarantees before integrating
  • —Bulk or high-frequency data retrieval where per-request pricing adds up
  • —Accessing portfolios other than ID 50 (only this ID is confirmed)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/50/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/50/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific endpoint is not listed on the provider's own landing page. Effectively a stub with confirmed liveness.

Warnings

  • —This specific endpoint (/api/v1/portfolios/50/holdings) is not listed on the provider's landing page among their advertised APIs
  • —No request body schema or response schema is available — integration requires trial and error
  • —Docs, pricing, and API pages all render only a 'Connect wallet' prompt with no further content
  • —Only portfolio ID 50 is referenced; it is unclear if other portfolio IDs are supported

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:34:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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