x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/133

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 suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind per-request USDC micropayments on the Base network.

The specific endpoint `/api/v1/charges/133` is labeled "Premium API Access" in the x402 challenge. The challenge indicates it accepts exact-scheme payments on Base using USDC (contract 0x8335…2913) with a maxAmountRequired of 20000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02/request price point. However, the crawled documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for this specific endpoint are unknown. Without documentation on what this endpoint accepts or returns, its concrete functionality beyond the generic "Premium API Access" label remains unclear.

Capabilities

x402-paymentusdc-micropaymentbase-networkper-request-billingno-api-keyjson-response

Use cases

  • —Accessing premium API functionality with per-call USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —Agents that can settle USDC payments on Base L2
  • —Use cases requiring no-signup, no-rate-limit API access

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Applications requiring free or fiat-only payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/133 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/133
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the actual functionality behind "Premium API Access" is completely unspecified. Docs, pricing, and README pages all returned only a wallet-connect prompt.

Warnings

  • —No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt
  • —The actual functionality of /api/v1/charges/133 ('Premium API Access') is unspecified; it is unclear what data or service it provides
  • —No request or response schema is documented or discoverable
  • —The endpoint path '/charges/133' suggests a specific charge record rather than a general-purpose API, which may indicate limited or niche functionality

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:15:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/xTneZ5
x402-gated premium API access on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart