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/97/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/97/transactions` accepts POST requests and charges up to $0.02 per call in USDC on the Base network. Payment is handled inline via the x402 header challenge — no API keys or accounts are required.

The hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. However, this particular endpoint targets portfolio-level transaction records (portfolio ID 97). No OpenAPI schema, request body documentation, or response examples are available from the crawled material, so the exact fields accepted and returned are unknown. The docs, pricing, and API pages all resolve to a minimal "Connect wallet" prompt with no further detail.

Because the endpoint returned a well-formed 402 challenge with x402 version 1, it is confirmed live. The payment is settled in USDC (contract 0x8335…2913) on Base to address 0x1A2B…85F3, with a max timeout of 300 seconds. The `maxAmountRequired` of 20000 base units equals $0.02 (USDC uses 6 decimals).

Capabilities

x402-paymentusdc-baseportfolio-transactionspay-per-requestno-api-key

Use cases

  • —Fetching transaction records for a specific portfolio
  • —Integrating portfolio transaction data into dashboards or analytics pipelines
  • —Agent-driven portfolio monitoring with per-call USDC payments

Fit

Best for

  • —Developers wanting keyless, pay-per-use portfolio transaction data
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or response schemas before integrating
  • —Bulk historical data exports (no evidence of batch support)
  • —Users without USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/97/transactions
# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/97/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no request/response documentation, and no examples. The docs pages are empty stubs. The purpose of 'portfolio 97 transactions' is opaque — it could be demo/placeholder data. Effectively a stub listing.

Warnings

  • —No OpenAPI or request/response schema available — request body format and response structure are unknown.
  • —Documentation pages (/docs, /api, /pricing, /README) all resolve to a minimal 'Connect wallet' page with no useful content.
  • —The specific portfolio ID (97) is hardcoded in the endpoint path; unclear whether this represents real or demo data.
  • —The broader lowpaymentfee.com site lists many diverse API categories but provides no substantive documentation for any of them.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:05:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/VNWH37