x402 census · saylorinnovations.com · 8efdb462b422 · JSON
GET /api/evm/base/balance/:address
needs-input
EVM Wallet Balances (base). Base ERC-20 token balance and native ETH balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.
Verdict: not verified by an unpaid GET. 400/422: wants input before the 402. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://saylorinnovations.com/api/evm/base/balance/:address |
| Method | GET |
| Price | $0.003 USDC = 3000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, eip155:137, eip155:42161 |
| payTo | 0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa |
| Seller | saylorinnovations.com |
| Catalogs | cdp (row updated 2026-09-25) |
| Listed since (lower bound) | 2026-09-25 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-25 |
| CDP quality counters | 2 calls and 1 unique payers in 30 days, last call 2026-09-25 (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 | · evm, base, balance, onchain |
Unpaid probe (census of 2026-09-30)
| Field | Value |
|---|---|
| Probed at | 2026-09-30T23:49:05.119Z |
| HEAD | 400 |
| GET | 400 |
| Verdict | needs-input 400/422: wants input before the 402 |
| 402 carried in | n/a |
| x402Version in the 402 | n/a |
| accepts[0] | none |
| Live amount equals catalog price | not comparable |
| Live payTo equals catalog payTo | not comparable |
| extensions.bazaar in the 402 | no |
| PAYMENT-REQUIRED header | no |
| WWW-Authenticate offer | none |
| Content type / server / CORS | application/json / cloudflare / * |
| Latency | 1,238 ms |
| Error | none |
Latest re-probe
| Field | Value |
|---|---|
| Re-probed at | 2026-10-01T07:13:42.000Z (cron) |
| Verdict now | needs-input unchanged |
| HEAD / GET | 400 / 400 |
| accepts[0] | none |
| Live amount equals catalog price | not comparable |
| Latency | 1,299 ms |
| Error | none |
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 2 |
| Payments | 6 |
| USDC volume | $0.02 |
| Median payment | $0.0025 |
| First / last payment | 2026-09-27 / 2026-09-29 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"pathParams": {
"address": "EVM wallet address (0x-prefixed, 40 hex characters)"
},
"type": "http"
},
"output": {
"type": "json",
"example": {
"block": 51738756,
"chain": "base",
"native": {
"balance": "1.2345",
"raw": "1234500000000000000",
"symbol": "ETH"
},
"tokens": [
{
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"balance": "250.5",
"decimals": 6,
"raw": "250500000",
"symbol": "USDC"
}
],
"wallet": "0x4200000000000000000000000000000000000006"
}
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://saylorinnovations.com/api/evm/base/balance/:address' -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/8efdb462b422/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"8efdb462b422"} 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 saylorinnovations.com.