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/178

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 commitments required.

The specific endpoint `/api/v1/charges/178` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme, settling to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses.

Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality "Premium API Access" at charges/178 specifically provides. The site appears to be a demonstration or early-stage x402 API marketplace.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyhttp-postjson-response

Use cases

  • —Programmatic access to paid API endpoints without API key management
  • —Agent-driven pay-per-call workflows using x402 on Base
  • —Exploring x402 protocol integration with USDC micropayments

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless, pay-per-request API access
  • —Projects wanting USDC-settled micropayments on Base

Not for

  • —Production workloads requiring documented request/response schemas
  • —Users who need detailed API documentation before integrating
  • —Anyone needing non-USDC or non-Base payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/178 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/178
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no indication of what 'Premium API Access' at charges/178 actually returns. The listing is effectively a stub with confirmed liveness and pricing.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —The specific functionality of /api/v1/charges/178 ('Premium API Access') is undefined — it is unclear what data or service it provides
  • —Site may be a demo or early-stage project

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:20:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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