x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/337

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.

The specific endpoint `/api/v1/charges/337` is listed as "Premium API Access" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.

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 schema, no request/response examples, and no description of what this particular charge endpoint actually returns. The site's landing page lists many API paths but provides no detail on input parameters or output formats. Treat this listing as a stub until richer documentation becomes available.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responsehttp-post

Use cases

  • —Programmatic access to a pay-per-call API catalog without API key management
  • —Agent-driven workflows that need on-demand API calls settled in USDC on Base
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers exploring x402 payment protocol integrations
  • —AI agents that need keyless, pay-as-you-go API access
  • —Users who want to avoid subscription commitments for occasional API calls

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or rate-limited plans

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/337 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/337
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but documentation is effectively nonexistent — every page beyond the landing renders only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint returns. The listing is a stub.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or input/output schema provided; request format and response structure are unknown
  • —The specific purpose of /api/v1/charges/337 ('Premium API Access') is not explained anywhere
  • —Cannot verify what data or service is actually delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:50:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/PMb4hS
Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart