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/25/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/25/transactions` accepts POST requests and is gated behind a per-call USDC payment on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site-wide pricing of $0.02/request.

lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model, require no API keys, and settle payments on the Base L2 network using USDC. The platform advertises no rate limits and instant access.

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 the portfolio transactions endpoint actually returns or what POST body it expects. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to use without experimentation.

Capabilities

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

Use cases

  • —Retrieving transaction data for a specific portfolio via pay-per-call USDC payments
  • —Integrating portfolio transaction lookups into agent workflows without API key management
  • —Accessing financial transaction records through x402 micropayments on Base

Fit

Best for

  • —Agents or apps that need on-demand portfolio transaction data without subscription commitments
  • —Developers experimenting with x402 payment-gated APIs on Base
  • —Low-volume consumers who prefer per-call pricing over monthly plans

Not for

  • —Users who need detailed API documentation or schema definitions 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/25/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/25/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts POST requests with USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose and data model of the portfolio transactions endpoint are entirely undocumented.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema describing request body or response format
  • —The specific purpose and data returned by /api/v1/portfolios/25/transactions is unknown
  • —Portfolio ID '25' is hardcoded in the URL with no explanation of what portfolio it references

Citations

Provenance

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

Agent access

JSONhttps://clawmart.sh/api/listings/JLp3kH
x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart