x402basequality 0.25

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/169

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/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, settled in USDC on Base with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/charges/169` is labeled "Premium API Access" in the x402 challenge and accepts HTTP POST requests. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint 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 documentation, and no examples available. It is unclear what specific functionality the `/api/v1/charges/169` path provides beyond the generic "Premium API Access" label, as the site's catalog lists many different endpoints but this particular path does not appear among them.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responsehttp-post

Use cases

  • —Accessing pay-per-call API services without API key registration
  • —Making micropayment-gated API requests settled in USDC on Base
  • —Agent-driven programmatic access to premium endpoints via x402 protocol

Fit

Best for

  • —Developers wanting keyless, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or schemas before integrating
  • —Anyone without a Base-compatible USDC wallet
  • —High-volume use cases where per-request pricing may add up

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/169 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/169
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 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, no examples, and the specific purpose of /api/v1/charges/169 is unclear. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'
  • —No OpenAPI or schema definition found
  • —The specific endpoint /api/v1/charges/169 does not appear in the site's listed API catalog, making its purpose unclear
  • —No request or response examples available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:20:14Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/hCk8ge
x402-gated premium API access on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart