x402 census · mpp.tracefast.xyz · ad570a289287 · JSON

GET /api/v1/chains/1/entities/:address/tokens/:token/balance

live

TraceFast live Ethereum data: balanceOf(address) for one token at the end of a block, read from contract storage. A token outside the covered set is refused (422), never a fake zero. Path address and token: 0x-prefixed, 40 hex. Query block: integer, state at the end of this block, absent = current. Docs: https://docs.tracefast.xyz/api/address-token-balance.md

Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).

Facts from the catalogs

Field Value

URL https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/tokens/:token/balance

Method GET

Price $0.02 USDC = 20000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0x2A65491E93Ad0d484b74405401A38e2E0E5EDd7e

Seller mpp.tracefast.xyz

Catalogs cdp (row updated 2026-09-04)

Listed since (lower bound) 2026-09-04 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-04

CDP quality counters 1 calls and 1 unique payers in 30 days, last call 2026-09-04 (catalog-reported, not verified on chain)

Category (keyword rule) chain-rpc

Templated path yes: contains :param or {param}; probed as listed

x402Version in catalog 2

Service name / tags TraceFast · blockchain, ethereum, address-intelligence, labels, entities

Unpaid probe (census of )

Field

Value

Probe

not probed in this build

Latest re-probe

Field Value

Re-probed at 2026-10-01T05:13:18.000Z (cron)

Verdict now live changed from unprobed

HEAD / GET 402 / 402

accepts[0] {"scheme":"exact","network":"eip155:8453","amount":"20000","payTo":"0x2A65491E93Ad0d484b74405401A38e2E0E5EDd7e","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}}

Live amount equals catalog price yes

Latency 227 ms

Error none

On-chain facts for the payTo (public address)

Field Value

Distinct payers 2

Payments 36

USDC volume $2.22

Median payment n/a

First / last payment 2026-09-03 / 2026-09-06

Sampler-shaped share of payments n/a

Payers that are not samplers n/a

Source blockscout-sample — newest page of inbound ERC-20 transfers only (<=50); counts are a floor, not a total

Address 0x2A65491E93Ad0d484b74405401A38e2E0E5EDd7e

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "pathParams": {
   "address": "0xf977814e90da44bfa03b6295a0616a897441acec",
   "token": "0xdac17f958d2ee523a2206206994597c13d831ec7"
  },
  "queryParams": {},
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "data": {
    "address": "0xf977814e90da44bfa03b6295a0616a897441acec",
    "balance": "17000000000000198",
    "balanceBasis": "contract_storage",
    "decimals": 6,
    "symbol": "USDT",
    "token": "0xdac17f958d2ee523a2206206994597c13d831ec7",
    "window": {
     "asOfBlock": 25901228,
     "kind": "current"
    }
   }
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/tokens/:token/balance' -H 'accept: application/json'

The catalog declares GET. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/ad570a289287/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"ad570a289287"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on mpp.tracefast.xyz.