x402basequality 0.30

Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/228

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/228` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas, parameters, and behavior of this specific endpoint remain unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Testing x402 payment protocol integrations

Fit

Best for

  • —Developers experimenting with x402 pay-per-call patterns
  • —Agents that need keyless, on-demand API access settled in crypto
  • —Low-volume consumers who prefer pay-as-you-go over subscriptions

Not for

  • —Users who need detailed API documentation and schemas before integrating
  • —High-volume production workloads requiring SLAs and guaranteed uptime

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/228 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/228
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual functionality is completely undocumented. All documentation pages return only 'Connect wallet' with no schemas, examples, or descriptions of what the endpoint does. The 'Premium API Access' label is generic and uninformative.

Warnings

  • —The specific functionality of /api/v1/payments/228 is undocumented — 'Premium API Access' is the only description available.
  • —All documentation pages (/docs, /api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The endpoint path '/api/v1/payments/228' with a numeric ID suggests this may be a generic or dynamically generated resource rather than a well-defined API.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:51:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/QNuCZU
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart