payment-ready until 2026-09-15
17 on-chain compute primitives in one x402 API: keccak256, ABI encode/decode, function selectors, EIP-712 hashing + signature recovery/verification, merkle root/proof/verify, CREATE/CREATE2 address derivation, ENS namehash, checksum, unit conversion, RLP encode/decode. Pure computation, no data dependencies. 0.02 USDC per call on Base.
Part of the Leeworks operator hub
Pay from $0.02 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
VERDICT
ranking generation 3solid 89/100 #5 of 41 in Blockchain by measured score
What the score read on this service: status online, 100% uptime 30d, 1621ms response p95, x402 compliance 13 of 14, $0.02 price against the category. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
It is a score inside Blockchain, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 41 listings, this one among them. That set is wider than the 41 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
ALTERNATIVES IN BLOCKCHAIN
Other Blockchain services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| 3Route | strong | 97 | 99.9% | --- |
| Loyal Spark | strong | 96 | 99.9% | $137.59 |
| OneSource | strong | 96 | 100% | $69.47 |
| Testnet ETH Merchant | solid | 90 | 100% | --- |
| true402 | solid | 89 | 96.1% | $0.92 |
ASSESSMENT
updated 25m agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 99.8%
- uptime 30d
- 100%
- uptime 90d
- 99.8%
- response p95
- 1621ms
- avg response
- 1360ms
- total checks
- 2,758
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (13/14): declares the current x402 version (2)
13 of 14 x402 conformance checks pass; failing: declares the current x402 version (2). Full checklist below.
price $0.02 (p66 in Blockchain)
- price (min)
- $0.02
- category percentile (min)
- p66 in Blockchain
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
traction ---
This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| POST | /v1/crypto | On-chain compute: keccak256, ABI encode/decode, fn/event selectors, EIP-712 hashing, EIP-191/712 recovery, Merkle proofs, CREATE/CREATE2, ENS namehash, checksum, unit convert, RLP | $0.02 | Base | USDC | body (v1 style) |
REQUEST / RESPONSE EXAMPLE
An unpaid request to POST /v1/crypto returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i -X POST 'https://chainkit.leeworks.dev/v1/crypto'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"input": {
"method": "POST",
"schema": {
"type": "object",
"required": [
"op"
],
"properties": {
"op": {
"enum": [
"keccak256",
"abi_encode",
"abi_decode",
"selector",
"eip712_hash",
"recover",
"verify_712",
"merkle_root",
"merkle_proof",
"verify_merkle",
"create2",
"create_address",
"namehash",
"checksum",
"unit_convert",
"rlp_encode",
"rlp_decode"
],
"type": "string",
"description": "Operation to run; remaining fields depend on op"
},
"args": {
"type": "array",
"description": "abi_encode: arguments for the given signature"
},
"data": {
"type": "string",
"description": "keccak256: hex(0x…) hashed as bytes else UTF-8. abi_decode: calldata. rlp_*: hex or nested array"
},
"from": {
"type": "string",
"description": "create_address: deployer address"
},
"leaf": {
"description": "merkle_proof/verify_merkle: target leaf"
},
"name": {
"type": "string",
"description": "namehash: ENS name e.g. vitalik.eth"
},
"salt": {
"type": "string",
"description": "create2: 32-byte hex salt"
},
"nonce": {
"type": "integer",
"description": "create_address: deployer nonce"
},
"proof": {
"type": "array",
"description": "verify_merkle: hex proof"
},
"types": {
"type": "array",
"description": "abi_encode/abi_decode: raw ABI type list e.g. [\"address\",\"uint256\"]"
},
"value": {
"type": "object",
"description": "verify_712/eip712_hash: typed-data value"
},
"domain": {
"type": "object",
"description": "verify_712/eip712_hash: EIP-712 domain"
},
"leaves": {
"type": "array",
"description": "merkle_*: leaf values (keccak256, sorted pairs)"
},
"values": {
"type": "array",
"description": "abi_encode: values matching types"
},
"address": {
"type": "string",
"description": "checksum: address to checksum/validate"
},
"message": {
"type": "string",
"description": "recover: the personal_sign message"
},
"deployer": {
"type": "string",
"description": "create2: deployer address"
},
"initCode": {
"type": "string",
"description": "create2: init code (hashed) — or pass initCodeHash"
},
"signature": {
"type": "string",
"description": "recover/verify_712: 0x sig. abi_encode/abi_decode/selector: a fn/event sig e.g. transfer(address,uint256)"
},
"value_num": {
"description": "unit_convert: amount (use field 'value')"
}
}
},
"example": {
"op": "selector",
"signature": "transfer(address,uint256)"
},
"contentType": "application/json"
},
"output": {
"example": {
"ok": true,
"op": "selector",
"topic0": "0xa9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b",
"selector": "0xa9059cbb"
},
"contentType": "application/json",
"description": "Always {ok, op}; other fields depend on op (hash | data | values | selector/topic0 | digest | signer | root/proof | address | checksum | wei/result | rlp/decoded)"
},
"version": "2"
},
"payTo": "0xa8B061d96F69426f11bcC807BfA00f0AF79541a7",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://chainkit.leeworks.dev/v1/crypto",
"description": "On-chain compute: keccak256, ABI encode/decode, fn/event selectors, EIP-712 hashing, EIP-191/712 recovery, Merkle proofs, CREATE/CREATE2, ENS namehash, checksum, unit convert, RLP",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 120
}
],
"x402Version": 1
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/chainkit/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
COMPLIANCE
13/14 checks pass · grade A · failing: declares the current x402 version (2)last 402 captured 2026-07-25 · last up 2026-09-08
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
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