BaseDue · Base token due diligence in one call
payment-ready until 2026-11-04
One $0.01 x402 call returns a Base token's deepest-pool price, liquidity, 24h volume, and mechanical risk flags, pulled live from Dexscreener.
Compare: all company data APIs
Call it x402 v2
x402 v2
- Base URL
- https://api.firstmention.uk/s/basedue/
- Payment
- x402 v2, header channel
$ curl -i 'https://api.firstmention.uk/s/basedue/due' An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.
Endpoints 3 paid routes on api.firstmention.uk
Prices as captured in the 402 response: median $0.01 across the 3 endpoints, unchanged since first capture.
Example 402 response
Endpoints and prices
| Method | Path | Description | Price | Network | Asset | 402 channel | Captured |
|---|---|---|---|---|---|---|---|
| GET | / | Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint. | $0.01 | Base | USDC | header | since 10-28 |
| GET | / | Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint. | $0.01 | Base | USDC | header | since 10-28 |
| GET | / | Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint. | $0.01 | Base | USDC | header | since 10-28 |
Payment evidence
402 payload captured at . Check evidence JSON · Measurement methodology.
First of 3 payloads captured by the monitor.
154 lines, scroll inside
{
"error": "PAYMENT-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xe029Fcf4ba573F6fdc282208fe855dF8CBb3Ca9A",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.firstmention.uk/s/basedue/due",
"tags": [
"base",
"onchain",
"token",
"price",
"batch"
],
"mimeType": "application/json",
"description": "Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint.",
"serviceName": "basedue"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"tokens": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913,0x4200000000000000000000000000000000000006"
}
},
"output": {
"type": "json",
"example": {
"ok": true,
"chain": "base",
"results": [
{
"ok": true,
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"bestVenue": "aerodrome",
"spreadPct": 0.01,
"referencePriceUsd": 1.00005
}
],
"endpoint": "price"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"properties": {
"tokens": {
"type": "string"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"chain": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"token": {
"type": "string"
},
"bestVenue": {
"type": "string"
},
"spreadPct": {
"type": "number"
},
"referencePriceUsd": {
"type": "number"
}
}
}
},
"endpoint": {
"type": "string"
}
}
}
}
}
}
}
}
},
"x402Version": 2
} Other captured 402 responses (2)
Captured payload 2 of 3
{
"error": "PAYMENT-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xe029Fcf4ba573F6fdc282208fe855dF8CBb3Ca9A",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.firstmention.uk/s/basedue/price",
"tags": [
"base",
"onchain",
"token",
"price",
"batch"
],
"mimeType": "application/json",
"description": "Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint.",
"serviceName": "basedue"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"tokens": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913,0x4200000000000000000000000000000000000006"
}
},
"output": {
"type": "json",
"example": {
"ok": true,
"chain": "base",
"results": [
{
"ok": true,
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"bestVenue": "aerodrome",
"spreadPct": 0.01,
"referencePriceUsd": 1.00005
}
],
"endpoint": "price"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"properties": {
"tokens": {
"type": "string"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"chain": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"token": {
"type": "string"
},
"bestVenue": {
"type": "string"
},
"spreadPct": {
"type": "number"
},
"referencePriceUsd": {
"type": "number"
}
}
}
},
"endpoint": {
"type": "string"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 3 of 3
{
"error": "PAYMENT-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xe029Fcf4ba573F6fdc282208fe855dF8CBb3Ca9A",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.firstmention.uk/s/basedue/report",
"tags": [
"base",
"onchain",
"token",
"price",
"batch"
],
"mimeType": "application/json",
"description": "Base token due diligence over x402. /report bundles due diligence, cross-venue reference price and position exit cost in ONE $0.01 call. /price now takes up to 10 tokens per $0.01 call for bulk screening. Free /sample on every endpoint.",
"serviceName": "basedue"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"tokens": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913,0x4200000000000000000000000000000000000006"
}
},
"output": {
"type": "json",
"example": {
"ok": true,
"chain": "base",
"results": [
{
"ok": true,
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"bestVenue": "aerodrome",
"spreadPct": 0.01,
"referencePriceUsd": 1.00005
}
],
"endpoint": "price"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"properties": {
"tokens": {
"type": "string"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"chain": {
"type": "string"
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"token": {
"type": "string"
},
"bestVenue": {
"type": "string"
},
"spreadPct": {
"type": "number"
},
"referencePriceUsd": {
"type": "number"
}
}
}
},
"endpoint": {
"type": "string"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Can I trust it score from our own monitoring
score from our own monitoring
#5 of 89 in Blockchain. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.
- Reliability
- 100% uptime since 10-28
- Compliance
- A 14/14 checks pass
- Price
- $0.01 p63 in Blockchain
- Risk
- clean no risk flag
- Traction
- ---
14/14 compliance checks
- 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
402 terms unchanged since 2026-10-28. Last up 2026-10-28.
── Site signals
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
How the score works
What the score read on this service: status online, 100% uptime, latest daily rollup (no 30d window yet), 32ms response p95, x402 compliance 14 of 14, $0.01 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.
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.
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 89 listings, this one among them: the same 89 the position above is counted against. When the two differ, the field is the wider one, 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.
All measured facts
What it does
One $0.01 x402 call returns a Base token's deepest-pool price, liquidity, 24h volume, and mechanical risk flags, pulled live from Dexscreener. Includes a free /sample endpoint.
BaseDue · Base token due diligence in one call is a listed x402 Blockchain API. Captured payment terms name Base. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.
Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.
Page rendered at . This response time is separate from the observation and computation times attached to each measurement.
Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.
Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.
Observed daily coverage: 2026-09-29 to 2026-10-28 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.
Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.
x402 List home · Services · Blockchain
- uptime · latest daily rollup
- -
- uptime 7d
- -
- uptime 30d
- -
- uptime 90d
- -
- response p95
- 32ms
- avg response
- 32ms
- total checks
- 1
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
- price (min)
- $0.01
- category percentile (min)
- p63 in Blockchain
- endpoints / prices
- 3 / 1
- model
- flat
- stability
- 100%
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
- 6d
- registrar
- GoDaddy.com, LLC.
- hosting
- custom
- domain created
- 2026-10-22
Identity facts, not a risk score.
On-chain traction has not been assessed for this service yet.
- member since
- 2026-10-28
Recent checks
| Checked at (UTC) | Status | HTTP | Response | Endpoints |
|---|---|---|---|---|
| Online | 402 | 41ms | 3 | |
| Online | 402 | 46ms | 3 | |
| Online | 402 | 179ms | 3 | |
| Online | 402 | 134ms | 3 | |
| Online | 402 | 37ms | 3 | |
| Online | 402 | 677ms | 3 | |
| Online | 402 | 114ms | 3 | |
| Online | 402 | 32ms | 3 |
Changes0 in 30d
No changes recorded in the last 30 days.
Over time
On-chain traction has not been assessed for this service yet.
- Uptime
- no completed-day data
On-chain traction has not been assessed for this service yet.
More charts
09-29 to 10-28* UTC
Each series spans only the dates it has data for. Every series is also served as JSON at /api, /scores, /volume and /buyers.
Values
* today so far, partial (UTC).
The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.
Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.
| Day | Uptime | Response | Compliance | Price percentile | Site signals |
|---|---|---|---|---|---|
| 2026-10-28* | 100% | 157.50ms | 14/14 | p63 | 2/6 |
Alternatives in Blockchain
5 of 88 other ranked services in Blockchain, ordered by the same measured score.
Own this service?
Keep this listing accurate. Ownership is proven with a domain check and every change is reviewed by hand.
Update this listingEarn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.
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Delisting
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