x402basequality 0.25

x402-gated portfolio transactions endpoint on Base, paid per-call in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/55/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/55/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-paywalled API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.

The specific endpoint probed here returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments. The payment scheme is "exact" with a 300-second timeout.

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 transactions endpoint accepts or returns. The endpoint title "Premium API Access" and the path suggest it retrieves or creates transactions for a specific portfolio (ID 55), but the exact data model is unknown. The platform appears to be a demonstration or early-stage x402 API marketplace rather than a mature production service.

Capabilities

x402-paymentusdc-settlementbase-networkportfolio-transactionsper-call-pricingno-api-key

Use cases

  • —Fetching or posting portfolio transaction records behind a micropayment wall
  • —Demonstrating x402 payment protocol integration for API monetization
  • —Programmatic access to financial portfolio data without traditional API keys

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can settle USDC payments on Base for per-call API access
  • —Use cases needing keyless, pay-per-request API access

Not for

  • —Production workloads requiring documented request/response schemas
  • —Users who need free or subscription-based API access
  • —Applications requiring detailed API documentation or SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/55/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/55/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond its URL path. The 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'
  • —No OpenAPI or request/response schema provided; input and output formats are unknown
  • —The endpoint path references a hardcoded portfolio ID (55), suggesting it may be a demo or placeholder
  • —The broader platform lists many endpoints but none have documented behavior

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:46:54Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/NRFRKU
x402-gated portfolio transactions endpoint on Base, paid per-call in USDC. — Clawmart · Clawmart