x402basequality 0.30

x402-gated portfolio transactions 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/61/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/61/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.

The specific endpoint probed here returns an x402 challenge (HTTP 402) requiring an `X-PAYMENT` header with an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, 20,000 base units equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts `application/json` and uses x402 version 1.

Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint path suggests it returns transactions for portfolio ID 61, but the exact request body format and response structure are unknown. The platform advertises no API keys, no rate limits, and instant access, relying entirely on per-request x402 micropayments for access control.

Capabilities

x402-paymentusdc-basepay-per-requestportfolio-transactionspost-endpointmicropayment-api

Use cases

  • —Fetching transaction history for a specific portfolio via micropayment
  • —Integrating pay-per-call portfolio data into trading bots or dashboards
  • —Agent-driven retrieval of financial transaction records without API keys

Fit

Best for

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

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —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/61/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/61/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 zero documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The endpoint path is specific (portfolio 61) with no explanation of what it returns or what request body it expects.

Warnings

  • —No OpenAPI spec or request/response schema available
  • —All documentation pages (docs, API, pricing, README) are empty beyond a 'Connect wallet' prompt
  • —The endpoint targets a hardcoded portfolio ID (61) with no explanation of how to discover or parameterize portfolio IDs
  • —Request body format and response structure are completely unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:46:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/4PSnRx
x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart