x402basequality 0.35

x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/44

What it does

This endpoint at `/api/v1/portfolios/44` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/44` resource is listed under "Premium API Access" but its exact data payload is not documented in the available crawl material. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.

Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 exact-payment scheme. The probe confirmed a live 402 challenge with `maxAmountRequired` of 20000 base units, which equals $0.02 (20000 / 10^6 = 0.02 USD). The endpoint accepts HTTP POST requests and returns `application/json`. No OpenAPI schema, request body schema, or example responses were found in the crawl, so the exact input parameters and output structure remain unknown.

The broader lowpaymentfee.com site lists roughly 16 endpoints across four categories but provides minimal documentation beyond endpoint names and prices. The docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no substantive content. Without documentation of the request body or response schema for this particular portfolio endpoint, callers will need to experiment or contact the provider to understand what data is returned.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseportfolio-data

Use cases

  • —Fetching portfolio data on-demand with per-request USDC micropayments
  • —Integrating pay-as-you-go financial data into agent workflows
  • —Accessing premium data without API key registration

Fit

Best for

  • —Agents or developers who want keyless, pay-per-request data access
  • —Users already holding USDC on Base who want frictionless API payments
  • —Prototyping workflows that need low-cost, commitment-free API calls

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible wallet or USDC balance

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/44 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/44
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation of request parameters, response schema, or what 'portfolios/44' actually returns. Docs pages are empty. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.
  • —The request body schema and response format for /api/v1/portfolios/44 are completely undocumented.
  • —It is unclear what 'portfolios/44' represents — the endpoint is not listed among the site's advertised APIs.
  • —No OpenAPI spec or ai-plugin manifest found.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:34:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/dYK93y
x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart