x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/298

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on Base.

The specific endpoint `/api/v1/payments/298` is labeled "Premium API Access" in the x402 challenge. Its exact functionality is not documented beyond this label — the crawled docs, pricing, and README pages all returned only a "Connect wallet" stub with no additional detail. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No OpenAPI schema, request/response examples, or detailed documentation were found.

Because the endpoint's actual behavior behind the paywall is undocumented, agents should treat this as a low-friction, inexpensive exploratory call. The site advertises no API keys, no rate limits, and instant access for all its endpoints.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpoint

Use cases

  • —Agents needing low-cost, keyless API access with per-call USDC micropayments
  • —Programmatic access to a catalog of data, AI, finance, and utility endpoints without subscription
  • —Testing x402 payment protocol integrations on Base

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns
  • —AI agents that need frictionless, no-signup API access
  • —Low-volume or bursty workloads where $0.02/request is cost-effective

Not for

  • —High-volume production workloads needing SLAs or guaranteed uptime
  • —Users who need detailed API documentation or response schemas before calling

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/298 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/298
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and network, but there is zero documentation on what this specific endpoint actually does or returns. Docs, pricing, README, and API pages all render only a 'Connect wallet' stub. Without request/response schemas or functional descriptions, this is effectively a stub listing.

Warnings

  • —No documentation available — all doc pages return only 'Connect wallet' with no content
  • —The specific function of /api/v1/payments/298 ('Premium API Access') is not described anywhere
  • —No OpenAPI spec, request schema, or response schema found
  • —No examples of request or response payloads available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:00:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/yaMpCw
x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits. — Clawmart · Clawmart