x402basequality 0.30

x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/28/transactions

What it does

This endpoint at lowpaymentfee.com exposes a POST-based transactions API for portfolio #28, gated behind the x402 payment protocol. Each call costs up to $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.

The hosting site (lowpaymentfee.com) advertises a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request and settled in USDC on Base. However, the specific endpoint being listed here — `/api/v1/portfolios/28/transactions` — is described only as "Premium API Access" with no further documentation on request schema, response format, or the nature of the portfolio data. The docs, pricing, and README pages on the site return only a "Connect wallet" prompt with no substantive content.

Because there is no OpenAPI schema, no request/response examples, and no documentation beyond the generic title, the exact functionality of this endpoint is unclear. It likely returns or creates transaction records for a portfolio, but the specifics (fields, filters, pagination) are unknown. Agents should be prepared for an opaque JSON response and may need to experiment with POST body parameters.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestportfolio-transactionspost-endpoint

Use cases

  • —Fetching or creating transaction records for a specific portfolio via a single paid API call
  • —Integrating pay-per-request financial data into agent workflows without API key management
  • —Demonstrating x402 protocol payment flows on Base with USDC

Fit

Best for

  • —Developers experimenting with x402 payment protocol integrations
  • —Agents needing keyless, pay-per-call access to portfolio transaction data
  • —Projects that want to avoid subscription commitments for occasional API calls

Not for

  • —Users who need detailed API documentation or guaranteed schema stability
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/28/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/28/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no examples. The site's docs pages are empty beyond a wallet connect prompt. This is effectively a stub listing.

Warnings

  • —No OpenAPI schema or request/response documentation available
  • —The endpoint's exact functionality (what portfolio #28 represents, what fields are accepted/returned) is unknown
  • —All documentation pages on the site return only 'Connect wallet' with no content
  • —The site advertises many endpoints but none have visible documentation

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:22:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/tRYxrq
x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart