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/charges/328

What it does

lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/328` is labeled "Premium API Access" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform lists endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request.

Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/charges/328` "Premium API Access" endpoint is unclear and may be a generic or catch-all entry point. Callers should expect to experiment or contact the provider for details on what this particular endpoint returns.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyno-rate-limitjson-response

Use cases

  • —Accessing premium API data without signing up for an account or obtaining API keys
  • —Making one-off API calls with instant USDC micropayments on Base
  • —Integrating pay-per-use endpoints into autonomous agent workflows

Fit

Best for

  • —Developers who want zero-signup, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Prototyping and low-volume usage where subscriptions are overkill

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/328 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/328
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schemas, and no clarity on what 'Premium API Access' actually returns. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages show only 'Connect wallet'
  • —The specific functionality of /api/v1/charges/328 ('Premium API Access') is undefined; it may be a generic or placeholder endpoint
  • —No example requests or responses are documented anywhere
  • —The platform lists many endpoint categories (AI, finance, data, etc.) but provides zero technical detail on any of them

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:49:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/4CpkTT
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart