blockchain-api.x402-chain-tools.workers.dev

Check the latest or current Base Mainnet block number. Use this to get the live Base block height.

Paid verification

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B 78.0 / 100

Availability 40.0 / 40

Endpoint responded (HTTP 200)

Payability 20.0 / 20

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 18.0 / 40

20 distinct payers, 75 USDC transfers in the last 30 days

Owner verified 0.0 / 3

Nobody has claimed this listing yet

Endpoint last checked 5 h ago. On-chain activity last read 45 h ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 87/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B, 78.0/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	20/25	Endpoint reachable; its 402 challenge was seen earlier (246 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	32/32 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 7 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (246 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, bazaar_feed, catalog_listing. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. Display only: search order uses the quality grade.

Compared with peers

Against 10,060 reachable x402 APIs in our daily snapshot (2026-11-12 01:39 UTC). Display only; it does not change search order.

Readiness: Higher than 75% of peers; This listing 87 · peer median 78
Latency: Faster than 42% of peers; This listing 246 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Live 402 challenge −5 — Answer the paid path with a valid 402 challenge.
Now: Endpoint reachable; its 402 challenge was seen earlier (246 ms).
Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Paid endpoints

7 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/block

Check the latest or current Base Mainnet block number. Use this to get the live Base block height.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/balance

Check the native ETH balance or gas balance of a Base wallet address. Use this to see how much Base ETH the wallet has.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/token-balance

Get ERC20 token balance for a Base wallet address. Use an ERC20 token contract address to return raw, decimal, and formatted token balance values.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/allowance

Get ERC20 allowance for an owner wallet and spender on Base. Return the approved token amount and whether the allowance is unlimited.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/transaction-lookup

Lookup Base transaction by hash on Base Mainnet. Return sender, recipient, value, nonce, block, gas fields, and input data when found.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/transaction-receipt-status

Check Base transaction receipt status by transaction hash. Determine whether the transaction is pending, confirmed successful, or confirmed reverted, with receipt, block, and gas details.

POST https://blockchain-api.x402-chain-tools.workers.dev/chain/wallet-preflight

Wallet preflight: check wallet readiness before token spend on Base. Verify native ETH gas balance, ERC20 token balance, allowance, spender contract status, and whether the requested amount can be spent.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://blockchain-api.x402-chain-tools.workers.dev/  # expect HTTP 402 Payment Required (about $0.001/call)

/.well-known/x402.json

https://blockchain-api.x402-chain-tools.workers.dev/.well-known/x402

Listed in

Directories this entry was found in.

cdp-bazaar since 2026-09-01 x402scan since 2026-09-13 x402 since 2026-10-10