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/76

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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 endpoints are priced at $0.02 per request, settled in USDC on Base with no API keys, no rate limits, and no minimum commitments.

The specific endpoint `/api/v1/charges/76` is labeled "Premium API Access" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 exact scheme by including an X-PAYMENT header with a signed USDC transfer to the payTo address on Base. The endpoint accepts HTTP POST and returns application/json.

Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no examples available. It is unclear what specific data or functionality the `/api/v1/charges/76` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. The endpoint is confirmed live (402 challenge captured).

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyjson-responsehttp-post

Use cases

  • —Programmatic access to paid API services without traditional API key registration
  • —Agent-driven workflows that need to pay per call using USDC on Base
  • —Accessing data, AI, finance, or utility endpoints with minimal friction

Fit

Best for

  • —Developers or agents who want keyless, pay-per-request API access
  • —Use cases requiring low-cost micropayments ($0.02) settled on-chain
  • —Scenarios where no subscription or rate-limit constraints are desired

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume use cases where per-request on-chain settlement overhead matters
  • —Users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/76 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/76
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 — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific function of /api/v1/charges/76 is unclear. Pricing is clear ($0.02 USDC on Base).

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —The specific purpose of /api/v1/charges/76 ('Premium API Access') is ambiguous — it is unclear which of the many advertised services it maps to
  • —No examples or sample responses available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:04:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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