https://ws.rpc.tac.build

TAC Mainnetevm

tac.build· ws.rpc compare ↔

Posture score

Speed score

TLS version

0x0000

Cipher

0x0000

KEX group

classical

PQ class

Classical only

ALPN

Cert expires in

Session resumed

TLS handshake

102ms

Resumption

TTFB

RPC block height

Prober warning: phase_b: Post "https://ws.rpc.tac.build": tls: failed to verify certificate: x509: certificate is valid for ingress.local, not ws.rpc.tac.build

TLS handshake

Version0x0000

Cipher0x0000

KEX groupclassical

ALPN-

PQ classClassical only

Handshake102ms

Resumed?no

OCSP stapledno

SCTs presentno

Certificate chain

Subject-

Issuer-

Key type-

Chain length-

SANs-

Not before-

Not after-

Days to expiry-

Misconfigurations

TLS version older than 1.2 tls_too_old
ALPN not negotiated no_alpn
OCSP stapling not enabled no_ocsp_staple

Grades

Posture

F46

Speed

B85

Certificate

TLS profile

Post-quantum

RPC reachability

Endpoint identity

URL

https://ws.rpc.tac.build

Host

ws.rpc.tac.build

Chain

TAC Mainnet

Chain ID

239

evm

Platform type

chain

Sibling RPCs

view all on chain page →

Live probe (last 24 h)

Probes attempted

Successful

Success rate

Median p50

Median p95

Latest bucket

TLS posture (post-quantum)full history →

Class

Classical only

Key exchange

Cipher

0x0000

Last seen

2026-10-07T23:57:44.543019387Z

History (30 days)

no history

Chain peer ranking

This URL is fastest right now

Fastest p50 latency

Latest block height

Current fastest URL

Using this RPCtabs auto-fill the URL + chain ID

JSON-RPC eth_chainId, which verifies the endpoint is alive and reports the chain ID.

curl -X POST 'https://ws.rpc.tac.build' \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

Scan reportschema rpcscan-report · captured 2026-10-10T05:58:21.230Z

SHA-256 of canonical content

computing…

The hash covers every field above the JSON serialization with sorted keys. Re-running this computation against the downloaded artifact must produce the same hash; that's how RPCScan's future on-chain proofs (rpcscanchain) will let anyone verify a published snapshot wasn't tampered with.