FastX402 Lab
lab.fastx402.tools · 6 paid endpoints · listed 2026-10-27
Exact conversion between a token's decimal amount and its integer base units (wei, USDC atomic units...) for any decimals 0-36. No floating point. Use it before signing a transfer or reading a balance.
downlast check 2 days ago
0%valid x402 answers, 72 h
$0.061USDC received on Base, 7 days
2distinct payers, 7 days
3.4score (0-100)
Paid endpoints
| Method | Endpoint | Price | Networks |
|---|---|---|---|
| GET | lab.fastx402.tools/byte-size-parse Accepts a file-size string such as 1.5 MiB, 800 KB, or 42 bytes and returns the exact byte count, detected unit system, and normalized IEC and SI forms. Use it | $0.001 | Base |
| GET | lab.fastx402.tools/keccak256 Keccak-256 hash (the Ethereum hash, not SHA3-256) of UTF-8 text or of hex bytes. Use it for Solidity storage keys, event topics, commitments or checking a hash | $0.001 | Base |
| GET | lab.fastx402.tools/token-units Exact conversion between a token's decimal amount and its integer base units (wei, USDC atomic units...) for any decimals 0-36. No floating point. Use it before | $0.001 | Base |
| GET | lab.fastx402.tools/cidr-calc Takes an IPv4 CIDR block like 10.0.0.0/22 plus an optional IP and returns network address, broadcast, netmask, wildcard, first and last usable host, usable host | $0.002 | Base |
| GET | lab.fastx402.tools/semver-match Accepts a comma-separated list of semantic versions and a semver constraint such as ^2.4.0 or >=1.5.0 <2.0.0, then returns matching versions and the highest mat | $0.002 | Base |
| GET | lab.fastx402.tools/btc-fees Returns current recommended Bitcoin fee rates in sat/vB for fastest, 30-minute, 1-hour, and economy confirmation targets, plus mempool transaction count and vsi | $0.003 | Base |
Latest checks
| When | Endpoint | HTTP | ms | Result |
|---|---|---|---|---|
| 2 days ago | lab.fastx402.tools/byte-size-parse | 308 | 321 | HTTP 308 instead of 402 |
| 7 days ago | lab.fastx402.tools/btc-fees | 308 | 247 | HTTP 308 instead of 402 |
Income on Base (7 days)
| Day | Transfers | USDC | |
|---|---|---|---|
| 2026-11-04 | 4 | $0.04 | |
| 2026-11-03 | 2 | $0.02 | |
| 2026-11-01 | 1 | $0.001 |
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Claim it for free with
x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/lab.fastx402.tools