Function selector lookup

Resolve 4-byte function selectors to known function names. Results keep input positions and mark unknown and ambiguous selectors.

POSThttps://triport.io/v1/intelligence/methods

Network: Chainless: one call covers every supported chain; no chain field
Scope: intelligence:read
Auth: x-token: $TRIPORT_API_KEY header (or Authorization: Bearer)
Rate limit: Business — 30 rps (intelligence, burst ×2); Enterprise — 150 rps

Request

cURLJavaScriptPython

curl -X POST "https://triport.io/v1/intelligence/methods" \
  -H "x-token: $TRIPORT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"selectors":["0xa9059cbb","0x095ea7b3"]}'

const res = await fetch("https://triport.io/v1/intelligence/methods", {
  method: "POST",
  headers: {
    "x-token": process.env.TRIPORT_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "selectors": [
      "0xa9059cbb",
      "0x095ea7b3"
    ]
  }),
});
const data = await res.json();
console.log(data);

import os


import requests


resp = requests.post(
    "https://triport.io/v1/intelligence/methods",
    headers={
        "x-token": os.environ["TRIPORT_API_KEY"],
        "Content-Type": "application/json",
    },
    json={
        "selectors": [
            "0xa9059cbb",
            "0x095ea7b3",
        ],
    },
)
data = resp.json()
print(data)

Response

JSON

Example

{
  "state": "ok",
  "meta": {
    "observedAt": "2026-11-06T09:21:17.525413413Z",
    "expiresAt": "2026-11-07T09:21:17.525413413Z",
    "cached": true,
    "complete": false
  },
  "data": {
    "matches": [
      {
        "selector": "0xa9059cbb",
        "functions": [
          "transfer"
        ],
        "known": true,
        "ambiguous": false
      },
      {
        "selector": "0x095ea7b3",
        "functions": [
          "approve"
        ],
        "known": true,
        "ambiguous": false
      }
    ],
    "missingSelectors": []
  }
}

Resolve 4-byte function selectors to known function names. Results keep input positions and mark unknown and ambiguous selectors.

A selector is not a unique identity: two functions can share one. A match does not tell you what a deployed contract actually does. Send selectors, not full calldata; use calldata decode for that.

This method takes no chain.

Every answer is an envelope with state, meta, optional data and optional error. Read state first: ok, empty, partial, stale, unsupported or unavailable (see response states). meta.cached tells you whether the answer came from cache.

Parameters

freshbooleanoptional

Optional. true skips the cache and asks for a new lookup (GET routes: ?fresh=1).

selectorsarray of stringrequired

4-byte function selectors, 0x + 8 hex characters each.

Response

Response recorded on 2026-11-06 through https://triport.io (long lists shortened). Values change over time.

Errors

HTTP	`error.code`	When
400	`invalid_request`	Malformed address, unknown field, `null` value or invalid JSON.
401	`unauthorized`	Missing or invalid API key.
403	`scope_missing` / `tier_insufficient`	The key lacks `intelligence:read`, or the plan is below Business.
405	`method_not_allowed`	Wrong HTTP method; the `Allow` header names `POST`.
422	`unsupported`	The chain (or the contract) is not supported by this method.
429	`rate_limited`	Over the `intelligence` per-second limit; wait `Retry-After` seconds.
503	`unavailable`	The lookup could not be completed right now; retry later.
504	`timeout`	The lookup took too long; retry, or retry later with the same input.

See errors, limits and states for the full rules and the code examples.