x402basequality 0.30

Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/45/transactions

What it does

This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/45/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, rate limits, or commitments required.

Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 per call. The endpoint uses the "exact" payment scheme with a 300-second timeout. No OpenAPI schema or detailed documentation was found beyond the landing page; the docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Because this specific endpoint path references a hardcoded portfolio ID (45), it is unclear whether the ID is parameterizable or if this is a fixed demo resource. The platform's actual data sources and response formats are undocumented, so callers should expect to experiment. The endpoint is confirmed live (402 challenge returned successfully).

Capabilities

x402-paymentusdc-settlementbase-networkportfolio-transactionspay-per-requestno-api-key

Use cases

  • —Fetching portfolio transaction history without traditional API key registration
  • —Programmatic access to financial transaction data with per-call USDC micropayments
  • —Agent-driven portfolio monitoring workflows that settle payments on Base L2

Fit

Best for

  • —Developers wanting zero-signup, pay-per-use portfolio data access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Prototyping financial data integrations without subscription commitments

Not for

  • —Users needing well-documented, schema-validated API responses
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/45/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/45/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific endpoint path with a hardcoded portfolio ID raises questions about parameterization. Effectively a stub listing.

Warnings

  • —No OpenAPI schema or request/response documentation available
  • —Docs, pricing, and README pages contain no substantive content (only 'Connect wallet')
  • —Endpoint path contains hardcoded portfolio ID (45) — unclear if parameterizable
  • —Actual data source and response format are unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:38:45Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/wkRQeV
Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request). — Clawmart · Clawmart