Blackwood State pay-per-call APIs

33 HTTP endpoints for agents, most of them first-party: onchain reads straight from the chain, ECB reference rates and Workers AI text tools. No account and no API key. Each endpoint answers HTTP 402 with its price, and the agent pays that one call in USDC on Base over x402 with the wallet it already has.

Cost and approval

• Every call below is paid, from US$0.003 to US$0.05. The table shows the list price; what counts is the price in the 402 answer, which can be lower during a price test.
• Ask the user before the first paid call and agree on a budget. Do not pay more than the price in the 402: the commands below cap each payment with --max-amount.
• A call that fails, or that the endpoint rejects as bad input (HTTP 400), is not charged.
• This skill is free. It only tells the agent how to call and pay; it holds no key and runs nothing by itself.

How to call

First, optional and free: GET on any endpoint returns its input schema and a real output example.

AgentCash (it creates its own wallet on first use; the wallet needs USDC on Base):

npx -y agentcash@0.17.1 fetch '<endpoint>' -m POST -b '<json body>' --max-amount <price in USD, e.g. 0.005>

Coinbase Agentic Wallet (the user signs in once with npx -y awal@2.12.2 auth login <email>):

npx -y awal@2.12.2 x402 pay '<endpoint>' -X POST -d '<json body>' --max-amount <price in USDC atomic units, 1000000 = US$1>

MCP (the same endpoints as tools, with a free demo credit for the first calls):

claude mcp add blackwood -- npx -y @blackwood-state/mcp@0.2.0

Routes marked "(job)" answer { jobId, pollUrl }: GET pollUrl (free) until done is true and read output. Every paid answer carries next, the paid call that usually continues the task.

Endpoints

Find, read and condense: news, web pages, PDFs and audio into short text

Task	Endpoint	Price	Example JSON body
News headlines search	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/news-headlines	US$0.008	{"query":"climate finance","limit":3}
Crypto news	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/crypto-news	US$0.005	{"hours":24,"limit":5}
Web page to Markdown	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/web-markdown	US$0.01	{"url":"https://httpbin.org/html","maxChars":500}
PDF to text (job)	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/pdf-text	up to US$0.05	{"url":"https://pdfobject.com/pdf/sample.pdf"}
Speech to text (job)	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/speech-to-text	up to US$0.05	{"url":"https://upload.wikimedia.org/wikipedia/commons/b/bb/Neil_Armstrong_small_step.wav"}
Summarize text	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/summarize	US$0.008	GET the route for the schema and an example
Translate text	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/translate	US$0.012	{"text":"Pay only for the requests you make.","from":"en","to":"pt"}
Sentiment analysis	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/sentiment	US$0.004	{"texts":["The checkout was fast and the support team was great.","The package arrived broken and nobody answered my emails."]}
LLM chat completion (job)	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/llm-chat	up to US$0.03	{"messages":[{"role":"user","content":"In one sentence, what is the x402 payment protocol?"}],"maxTokens":80}
News research briefing	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/news-briefing	US$0.04	{"topic":"bitcoin","hours":24}
Company research dossier	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/company-dossier	US$0.03	{"domain":"apple.com","ticker":"AAPL","name":"Apple"}

Domain, website and endpoint checks

Task	Endpoint	Price	Example JSON body
Domain intelligence	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/domain-intel	US$0.02	{"domain":"example.com","certificates":false}
Security headers	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/http-headers	US$0.007	{"url":"https://example.com"}
x402 endpoint check	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check	US$0.007	{"url":"https://x402.org/protected"}
Email validation	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/email-check	US$0.005	{"email":"postmaster@ietf.org"}
Email list check	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/email-batch	US$0.02	{"emails":["postmaster@ietf.org","test@mailinator.com","info@example.com","not-an-email"]}

FX rates, FX history and company financials

Task	Endpoint	Price	Example JSON body
Currency exchange rates	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/fx-rates	US$0.005	{"base":"USD","symbols":["EUR","BRL","JPY","GBP"],"amount":100}
Historical exchange rates	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/fx-history	US$0.005	{"symbols":["USD","BRL"],"days":7}
SEC company financials	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/sec-facts	US$0.02	{"ticker":"AAPL"}

Token prices, wallet balances, ENS names and gas fees on Ethereum, Base and Solana

Task	Endpoint	Price	Example JSON body
Token price on Base	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/token-price	US$0.003	{"token":"WETH"}
Wallet balances on Base	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances	US$0.004	{"address":"0x5A6c77758820182484EA8DE614FC65423E80749a"}
ENS name lookup	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/ens-lookup	US$0.005	{"name":"vitalik.eth"}
Gas price and fees	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/gas-fees	US$0.003	{}
Wallet portfolio and history	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-portfolio	US$0.005	{"address":"0xFf918CFB0690FdEd4224DBDab916F6E6F78882b7","chains":["base"],"historyLimit":2}
Wallet value in USD	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-value	US$0.005	{"address":"0x87DB3C25d1E8E40f8EF240D48a711B0C355CF8Cf","chains":["base"]}
Altcoin discovery on Base	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/altcoin-discovery	US$0.005	{"hours":24,"limit":3}

Weather, airport delays and time zones

Task	Endpoint	Price	Example JSON body
Weather forecast	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/weather-forecast	US$0.003	{"latitude":59.9139,"longitude":10.7522,"hours":3}
Airport delays	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/airport-delays	US$0.007	{}
Time zones	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/timezone	US$0.003	{"time":"2026-11-03T09:00","from":"America/New_York","to":["Europe/London","Asia/Tokyo","America/Sao_Paulo"]}

Images, speech and QR codes

Task	Endpoint	Price	Example JSON body
Image generation (job)	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/image-gen	US$0.03	{"prompt":"A brass lighthouse on a dark navy sea at dusk, minimalist flat illustration","steps":4}
Text to speech	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/text-to-speech	US$0.023	{"text":"Hello from Blackwood State. This audio was generated on demand.","lang":"en"}
QR code	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/qr-code	US$0.004	{"text":"https://x402-gateway.blackwoodstate8.workers.dev","ecc":"M"}

Random numbers and hashing

Task	Endpoint	Price	Example JSON body
Random numbers	POST https://x402-gateway.blackwoodstate8.workers.dev/v1/random	US$0.005	{"kind":"dice","count":2,"sides":6}

OpenAPI with every schema: https://x402-gateway.blackwoodstate8.workers.dev/openapi.json. Availability over 30 days: https://x402-gateway.blackwoodstate8.workers.dev/status.json.