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/126

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/126` 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, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base, and returns application/json. The platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.

Documentation is extremely sparse. 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 documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but what it actually returns upon successful payment is unknown.

Capabilities

x402-paymentusdc-basepay-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 against a live endpoint

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns
  • —Agents needing keyless, on-demand API access settled in USDC
  • —Low-commitment, no-subscription API consumption

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume use cases where $0.02/request adds up without bulk discounts
  • —Anyone without a Base-compatible USDC wallet

Quick start

# The endpoint requires an X-PAYMENT header with a valid x402 payment token.
# Using curl (you need an x402-compatible client to generate the payment):
curl -X POST https://lowpaymentfee.com/api/v1/payments/126 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/126
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.
  • —The exact functionality of /api/v1/payments/126 ('Premium API Access') is undocumented; it is unclear what data or service it provides upon successful payment.
  • —No OpenAPI spec or request/response schema is available.
  • —No examples of successful responses exist in the crawl material.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:38:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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